DCM3714xD2H26F0yzz Datasheet by Vicor Corporation

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@Ice VICCJR
Isolated, Regulated DC Converter
DCMin a VIA Package
DC-DC Converter
Features & Benefits
Isolated, regulated DC-to-DC converter
Up to 600 W, 25.00 A continuous
94.0% peak efficiency
309 W/in3Power density
Wide input range 200 – 420 Vdc
Safety Extra Low Voltage (SELV) 24.0 V Nominal Output
ZVS high frequency switching
Allows remote sense or local sense operation
Tight regulation over all line and load conditions
Fully operational current limit
OV, OC, UV, short circuit and thermal protection
Available in chassis mount and through hole VIA package
n3.750” x 1.400” x 0.370”
(95.13 mm x 35.5 mm x 9.40 mm)
Typical Applications
Industrial
Process Control
Heavy Equipment
Defense / Aeorspace
Product Description
The DCM in a VIA package is an Isolated, Regulated DC-to-DC
Converter, operating from an unregulated, wide range input to
generate an isolated 24.0 Vdc output. With its high frequency
zero voltage switching (ZVS) topology, the DCM converter
consistently delivers high efficiency across the input line range.
The DCM provides tight output voltage regulation and offers a
secondary-referenced control interface for trim, enable, and
remote sense operation. DCM converters and downstream
DC-DC products support efficient power distribution, providing
superior power system performance and connectivity from a
variety of unregulated power sources to the point-of-load.
The VIA package offers flexible thermal management options
with very low top and bottom side thermal impedances.
Product Ratings
VIN = 200 V to 420 V POUT = 600 W
VOUT = 24.0 V
(21.6 V to 26.4 V Trim) IOUT = 25.00 A
Part Ordering Information
Product
Function
Package
Length
Package
Width
Package
Type
Max
Input
Voltage
Range
Ratio
Max
Output
Voltage
Max
Output
Power
Product Grade
(Case Temperature) Option Field
DCM 37 14 x D2 H 26 F0 y z z
DCM =
DC-DC
Converter
Length in
Inches x 10
Width in
Inches x 10
B = Board VIA
V = Chassis VIA Internal Reference
C = -20 to 100°C[1]
T = -40 to 100°C[1]
M = -55 to 100°C[1][2]
01 = Chassis/Analog
05 = Short Pin/Analog
09 = Long Pin/Analog
Size:
3.750 x 1.400 x 0.370 in
95.13 x 35.5 x 9.40 mm
[1] High Temperature Power Derating may apply, see Thermal Specified Operating Area, Figure 1 on Page 4.
[2] M-Grade available on selected models. Consult vicorpower.com for details.
DCM3714xD2H26F0yzz
DCMin a VIA Package Rev 2.1
Page 1 of 23 07/2018
CUS
®
S
NRTL
CUS
VICOR
Typical Application
+IN +OUT
VDDE
EN
TR
-SENSE
+SENSE
-IN -OUT
DCMTM in a VIA package
COUT-EXT
C
F
VIN Non-isolated
Point-of-Load
Regulator
Load 1
Load 2
Typical Application: Single DCM3714xD2H26F0yzz in Local Sense Operation, to a non-isolated regulator, and direct to load
DCM3714xD2H26F0yzz
DCMin a VIA Package Rev 2.1
Page 2 of 23 07/2018
TOP VIEW
1
24
+IN +OUT
TOP VIEW
DCM in a VIA package - Chassis Mount
3
–OUT
–IN
5 VDDE
6 EN
7 TR
8 –SENSE
9 +SENSE
2
13
–IN –OUT
TOP VIEW
DCM in a VIA package - PCB Mount
4
+OUT
+IN
9 +SENSE
8 –SENSE
7 TR
6 EN
5 VDDE
Pin Configuration
Pin Descriptions
Pin
Number Signal Name Type Function
1 +IN INPUT POWER Positive input power terminal
2 –IN INPUT POWER
RETURN Negative input power terminal
3 +OUT OUTPUT POWER Positive output power terminal
4 –OUT OUTPUT POWER
RETURN Negative output power terminal
5 VDDE POWER INPUT External power supply for internal controller
6 EN CONTROL INPUT Enables and disables DCM. Needs VDDE preapplied
7 TR CONTROL INPUT Enables and disables trim functionality. Adjusts output voltage when trim active.
8 –SENSE CONTROL INPUT Negative sense pin, required for Remote Sense Operation. In Local Sense
Operation, it can be tied directly to –OUT to achieve better regulation accuracy.
9 +SENSE CONTROL INPUT Positive sense pin, required for Remote Sense Operation. In Local Sense
Operation, it can be tied directly to +OUT to achieve better regulation accuracy.
Note: All control inputs (EN, TR, –SENSE, +SENSE) are referenced to the secondary of the DCM and isolated from the primary.
Note: The dot on the VIA housing indicates the location of the control pin 9 (+SENSE pin).
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700 Maximum Output Power (W) _ N a A m at o o o o u o o o o o u o o 20 40 Case Temperature (“6) so an 100 120 Output Voltage (V) 30 26 26 24 22 20 1a 1a 14 12‘ s 13 is 23 28 Average Output Current (A) — Low Tnm Nom Trim High Tnm VICOR
Absolute Maximum Ratings
The absolute maximum ratings below are stress ratings only. Operation at or beyond these maximum ratings can cause permanent damage to the device.
Electrical specifications do not apply when operating beyond rated operating conditions.
Parameter Comments Min Max Unit
Input Voltage (+IN to –IN) -0.5 460 V
Input Voltage Slew Rate 1 V/µs
TR to –OUT -0.5 3.6 V
EN to –OUT -0.5 3.6 V
VDDE to –OUT 0 12 V
–SENSE to –OUT 0 2.225 V
+OUT to +SENSE 0 2.225 V
+SENSE to –OUT 0 31.2 V
Output Voltage (+Out to –Out) -0.5 32.6 V
Dielectric withstand (input to output) [2] See comment below 2121 Vdc
Internal Operating Temperature
C Grade -20 125 °C
T Grade -40 125 °C
M Grade -55 125 °C
Storage Temperature
C Grade -20 125 °C
T Grade -40 125 °C
M Grade -65 125 °C
Average Output Current 25.0 A
Figure 2 Electrical Specified Operating Area
Figure 1 Thermal Specified Operating Area: Max Output Power
vs. Case Temp, Single unit at minimum full load efficiency
[2] The absolute maximum rating listed above for Dielectric withstand (input to output) refers to the VIA package. The internal safety approved isolating
component (ChiP) provides reinforced insulation (4242 V) from the input to output. However, the VIA package itself can only be tested at a basic isolation
value (2121 V). See Dielectric Withstand Test section on page 15 and Dielectric Withstand section on page 18 for more details.
DCM3714xD2H26F0yzz
DCMin a VIA Package Rev 2.1
Page 4 of 23 07/2018
mu“- D D VICOR
Electrical Specifications
Specifications apply over all line, trim and load conditions, internal temperature TINT = 25ºC, unless otherwise noted. Boldface specifications apply over the
temperature range specified by the product grade.
Attribute Symbol Conditions / Notes Min Typ Max Unit
Power Input Specification
Input voltage range VIN Continuous operation 200 300 420 V
Inrush current (peak) IINRP With maximum COUT-EXT
, full resistive load 7.0 A
Input capacitance (internal) CIN-INT Effective value at nominal input voltage 1.7 µF
Input capacitance (internal) ESR RCIN-INT At 1 MHz 2.50 mΩ
Input inductance (external) LIN Differential mode, with no further line bypassing 5µH
No Load Specification
Input power – disabled PQ
Nominal line, see Fig. 3 1.5 2.5 W
Worst case line, see Fig. 3 3.0 W
Input power – enabled with no load PNL
Nominal line, see Fig. 4 3.0 4.5 W
Worst case line, see Fig. 4 5.0 W
Power Output Specification
Output voltage set point VOUT-NOM 23.88 24.0 24.12 V
Rated output voltage trim range VOUT-TRIMMING
Trim range over temp.
Specifies the Low, Nominal and High Trim conditions. 21.6 24.0 26.4 V
VOUT accuracy %VOUT-
ACCURACY
Total output voltage setpoint accuracy for all line
conditions and for all load conditions above 10%
of rated load, with trim inactive and SENSE pins
connected (either at the load for remote sense, or at
the DCM output for local sense)
0.5 %
VOUT accuracy with Sense Pins
floating
%VOUT-
ACCURACY-SF
Total output voltage setpoint accuracy for all line
conditions and for all load conditions above 10%
of rated load, with trim inactive and Sense Pins
floating (Local Sense only)
1.0 %
VOUT accuracy with trim active %VOUT-
ACCURACY-TRIM
Total output voltage setpoint accuracy for all line
conditions and for all load conditions above 10%
of rated load, with trim active
2.0 %
VOUT accuracy light load %VOUT-
ACCURACY-LL
Total output voltage setpoint accuracy for all line and
trim conditions, for load conditions below or equal to
10% of rated load
5.0 %
Rated output power POUT Continuous, VOUT 24.0 V 600 W
Rated output current IOUT Continuous, VOUT 24.0 V 25.00 A
Output current limit IOUT-LM
Of rated IOUT max. Fully operational current limit, for
nominal trim and below 100 115 135 %
Current limit delay tIOUT-LIM The module will power limit in a fast transient event 1 ms
Efficiency η
Full load, nominal line, nominal trim 91.7 93.2 %
Full load, over line and temperature, nominal trim 90.5 %
50% load, over rated line, temperature and trim 89.6 %
Output voltage ripple VOUT-PP
Over all operating steady-state line, load and trim
conditions, 20 MHz BW, with minimum COUT-EXT
350 mV
Output capacitance (internal) COUT-INT Effective value at nominal output voltage 112 µF
Output capacitance (internal) ESR RCOUT-INT At 1 MHz 0.06 mΩ
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VICOR
Electrical Specifications (cont.)
Specifications apply over all line, trim and load conditions, internal temperature TINT = 25ºC, unless otherwise noted. Boldface specifications apply over the
temperature range specified by the product grade.
Attribute Symbol Conditions / Notes Min Typ Max Unit
Power Output Specifications (Cont.)
Output capacitance (external) COUT-EXT
Excludes component temperature coefficient. For load
transients that remain > 2% rated load 1000 10000 µF
Output capacitance (external) COUT-EXT-
TRANSIENT
Excludes component temperature coefficient. For load
transients down to 0% rated load 1000 10000 µF
Output capacitance, ESR (ext.) RCOUT-EXT At 10 kHz, excludes component tolerances 10 mΩ
Initialization delay tINIT See state diagram 25 40 ms
Output turn-on delay tON
From rising edge EN, with VDDE pre-applied.
See timing diagram 200 µs
Output turn-off delay tOFF From falling edge EN. See timing diagram 600 µs
Soft start ramp time tSS Full load (soft-start ramp time) with minimum COUT-EXT 300 ms
VOUT threshold for max
rated load current VOUT-FL-THRESH
During startup, VOUT must achieve this threshold before
output can support full rated current 10.5 V
IOUT at startup IOUT-START
Max load current at startup while VOUT
is below VOUT-FL-THRESH
2.50 A
Monotonic soft-start threshold
voltage VOUT-MONOTONIC
Output voltage rise becomes monotonic with 1% of
preload once it crosses VOUT-MONOTONIC
13.0 V
Minimum required disabled duration tOFF-MIN
This refers to the minimum time a module needs to be
in the disabled state before it will attempt to start via EN 2ms
Minimum required disabled duration
for predictable restart tOFF-MONOTONIC
This refers to the minimum time a module needs to be in
the disabled state before it is guaranteed to exhibit
monotonic soft-start and have predictable startup timing
100 ms
Voltage deviation (transient) %VOUT-TRANS
Minimum COUT_EXT (10 90% load step)
<10 %
Settling time tSETTLE 2.0 ms
Powertrain Protections
Input Voltage Initialization threshold VIN-INIT Threshold to start tINIT delay 75.0 V
Input Voltage Reset threshold VIN-RESET Latching faults will clear once VIN falls below VIN-RESET 50.0 V
Input undervoltage lockout threshold VIN-UVLO- 130.0 165.0 V
Input undervoltage recovery threshold VIN-UVLO+ See Timing diagram 200.0 V
Input overvoltage lockout threshold VIN-OVLO+ 460.0 V
Input overvoltage recovery threshold VIN-OVLO- See Timing diagram 422.0 V
Output overvoltage threshold VOUT-OVP Latched shutdown 32.1 V
Minimum current limited VOUT VOUT-UVP Over all operating steady-state line and trim conditions 13.0 V
Overtemperature threshold (internal) TINT-OTP 120.0 °C
Power limit PLIM 950.0 W
VIN overvoltage to cessation of
powertrain switching tOVLO-SW Independent of fault logic 1.5 µs
VIN overvoltage response time tOVLO For fault logic only 200 µs
VIN undervoltage response time tUVLO 100 ms
Short circuit response time tSC Powertrain on, operational state 200 µs
Short circuit, or temperature fault
recovery time tFAULT See Timing diagram 1 s
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VICOR
Signal Specifications
Specifications apply over all line, trim and load conditions, internal temperature TINT = 25ºC, unless otherwise noted. Boldface specifications apply over the
temperature range specified by the product grade. Please note: For chassis mount models, Vicor part number 42550 will be needed for applications
requiring the use of signal pins (Enable, Trim and Sense functions).[3]
Enable: EN
The EN pin enables and disables the DCM converter; when held low the unit will be disabled.
• The EN pin is activated only if VDDE is preapplied before VIN is applied. Otherwise, EN is inactive and will be ignored until VIN is removed and reapplied.
Additonally, if VDDE is removed at any time, EN will return to inactive mode.
• The EN pin is referred to the –OUT of the converter and isolated from the primary side
SIGNAL TYPE STATE ATTRIBUTE SYMBOL CONDITIONS / NOTES MIN NOM MAX UNIT
DIGITAL
INPUT Any
EN enable threshold VENABLE-EN 2.31 V
EN disable threshold VENABLE-DIS Needs VDDE preapplied 0.99 V
Internally generated VCC VCC 3.23 3.30 3.37 V
EN internal pull up
resistance to VCC
RENABLE-INT 0.990 1.000 1.010 kΩ
Trim: TR
The TR pin enables and disables trim functionality when VIN is initially applied to the DCM converter.
When Vin first crosses VIN-UVLO+, the voltage on TR determines whether or not trim is active.
If TR is not floating at power up and has a voltage less than TR trim enable threshold, trim is active.
• If trim is active, the TR pin provides dynamic trim control with at least 250 Hz of -3dB control bandwidth over the output voltage of the
DCM converter.
• The TR pin has an internal pull-up to VCC and is referenced to the –OUT pin of the converter.
•V
TRIM-RANGE represents the trim pin functional limits only. Module performance is guaranteed within rated output voltage trim range VOUT-TRIMMING,
see electrical specification on page 5.
SIGNAL TYPE STATE ATTRIBUTE SYMBOL CONDITIONS / NOTES MIN NOM MAX UNIT
DIGITAL
INPUT Startup
TR trim disable threshold VTRIM-DIS
Trim disabled when TR above this threshold
at power up 3.20 V
TR trim enable threshold VTRIM-EN
Trim enabled when TR below this threshold
at power up 3.10 V
ANALOG
INPUT
Operational
with Trim
enabled
Internally generated VCC VCC 3.23 3.30 3.37 V
TR pin functional range VTRIM-RANGE Functional limits only 0.00 2.37 3.10 V
VOUT referred TR
pin resolution VOUT-RES With VCC = 3.3 V 17.58 mV
TR internal pull up
resistance to VCC
RTRIM-INT 0.999 1.000 1.001 kΩ
VDDE
VDDE powers the internal controller.
VDDE needs to be preapplied before VIN in order to activate EN functionalities.
If not preapplied, VDDE is derived from VOUT
; however, in this case, the enable function is not activated (the unit is always enabled and can be disabled
only by removing VIN.)
If VDDE is removed during operation, the unit will return in"always enabled" mode, ignoring the EN pin until VDDE is reapplied and VIN is cycled.
SIGNAL TYPE STATE ATTRIBUTE SYMBOL CONDITIONS / NOTES MIN NOM MAX UNIT
POWER
INPUT Any
Power input for internal
controller VDDE 4 5 10 V
VDDE current
consumption IVDDE 35 50 mA
DCM3714xD2H26F0yzz
[3] Signal cable 42550 is rated for up to 5 insertions and extractions. To avoid unnecessary stress on the connector, the cable should be tied to the chassis.
DCMin a VIA Package Rev 2.1
Page 7 of 23 07/2018
\I /| VICOR
Signal Specifications (Cont.)
Specifications apply over all line, trim and load conditions, internal temperature TINT = 25ºC, unless otherwise noted. Boldface specifications apply over the
temperature range specified by the product grade.Please note: For chassis mount models, Vicor part number 42550 will be needed for applications requiring
the use of signal pins (Enable, Trim and Sense functions).
+SENSE, –SENSE
Provide Remote Sense capability.
If floating, the DCM automatically implements Local Sense Operation. To achieve maximum regulation accuracy in local sense, the SENSE
pins should be connected directly to their respective OUT pins. If SENSE pins are floating, the regulation accuracy degrades
(see “VOUT accuracy with Sense Pins floating” on Page 5).
Module performance is guaranteed for ΔVOUT_TO_LOAD within rated limits specified below. For ΔVOUT_TO_LOAD higher than the specified limits, regulation
accuracy is not guaranteed. Also, high ΔVOUT_TO_LOAD might trigger OVP (for above nominal trim conditions), and might cause load voltage runaway
(which might trigger UVP).
ATTRIBUTE SYMBOL CONDITIONS / NOTES MIN NOM MAX UNIT
Remote Sense rated Voltage Drop ΔVOUT_TO_LOAD
Rated voltage drop between DCM output and sense
point at the load, in Remote Sense Operation.
Module performance is guaranteed for ΔVOUT_TO_LOAD
below this threshold.
240 mV
+SENSE
-SENSE
L
O
A
D
DCMTM in a VIA package
COUT-EXT
RLINE LLINE
+
-
VLOAD
RLINE LLINE
+
-
VOUT
DCM3714xD2H26F0yzz
DCMin a VIA Package Rev 2.1
Page 8 of 23 07/2018
VICOR
VOUT-NOM
VOUT
VIN-UVLO+/-
IOUT
FULL LOAD
VOUT-UVP
VIN-OVLO+/-
VIN
TR
ILOAD
Input
Output
EN
1
Input Power On
- Trim Inactive
3
TR
Ignored
4
EN
Low
5
EN
High
6
Input
OVLO
7
Input
UVLO
2
Ramp to
Full Load
tINIT tON tSS
tOFF tOFF
tSS tSS
tOFF tOFF
8
Input
returned
to zero
VTR-DIS
tMIN_OFF
tSS
tON
VIN-INIT
Timing Diagrams
Module Inputs are shown in blue; Module Outputs are shown in brown. Timing diagrams assume VDDE pre-applied. Without
VDDE pre-applied, EN is ignored, EN and Trim will go high after VOUT. All other behaviors (OVLO, UVLO, OVP, etc.)
will remain the same.
DCM3714xD2H26F0yzz
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VICOR
Timing Diagrams (Cont.)
Module Inputs are shown in blue; Module Outputs are shown in brown. Timing diagrams assume VDDE pre-applied. Without
VDDE pre-applied, EN is ignored, EN and Trim will go high after VOUT. All other behaviors (OVLO, UVLO, OVP, etc.)
will remain the same.
DCM3714xD2H26F0yzz
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Page 10 of 23 07/2018
CH1>——V—-—————— _I— CH4MM CH1 Voul‘ 1 V/dlv CH4 mm: 20 Ald‘v Tlmebase: 4 msldlv CH1v—““k——"—*—‘ ‘lW CH4)!" CH1 Voul 1 V/div Timebase14 msldiv CH4 mm: 20 Ald‘v VICOR
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Figure 7 — Full Load Efficiency vs. VIN, at low trim
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Figure 8 — Full Load Efficiency vs. VIN, at nominal trim
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Figure 4 No load power dissipation vs. VIN, at nominal trim
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  
Figure 3 Disabled power dissipation vs. VIN
Typical Performance Characteristics
The following figures present typical performance at TC= 2C, unless otherwise noted. See associated figures for general trend data.
Figure 6 10% to 100% load transient response, VIN = 300 V,
nominal trim, COUT_EXT = 1000 µF
Figure 5 100% to 10% load transient response, VIN = 300 V,
nominal trim, COUT_EXT = 1000 µF
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5. 2 2 5. 1 5. 1 0 E5 3.5638 2:83 500 400 300 200 [00 Voltage (V) VICOR
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Figure 12 — Efficiency (top three curves) and power dissipation
(bottom three curves) vs.load at TCASE = 60°C, nominal trim
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  
Figure 9 — Full Load Efficiency vs. VIN, at high trim

























 

     
Figure 11 — Efficiency (top three curves) and power dissipation
(bottom three curves) vs.load at TCASE = 25°C, nominal trim

















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




 

     
Figure 10 — Efficiency (top three curves) and power dissipation
(bottom three curves) vs.load at TCASE = -40°C, nominal trim
Typical Performance Characteristics (cont.)
The following figures present typical performance at TC= 2C, unless otherwise noted. See associated figures for general trend data.













     

  
Figure 13 Nominal powertrain switching frequency vs. load,
at nominal trim
Figure 14 Effective internal input capacitance vs. applied voltage
DCM3714xD2H26F0yzz
DCMin a VIA Package Rev 2.1
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7/, T CH1b—fi CHZDJ‘Fii I i—W#7 (mug! CHI Vent: 10 Vldlv CH3 EN: 2 Vldlv Tlmebase: 40 msldlv CH2Hn12A/dlv CHI Vent: 100 mVld‘V Tlmebase: 1 us/dlv VICCJR
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
     

  
Figure 16 Nominal powertrain switching frequency vs. load,
at nominal VIN
Typical Performance Characteristics (cont.)
The following figures present typical performance at TC= 2C, unless otherwise noted. See associated figures for general trend data.
Figure 17 Output voltage ripple, VIN = 300 V,
VOUT = 24.0 V, COUT_EXT = 1000 µF, RLOAD = 0.960 Ω
Figure 15 —Startup from EN, VIN = 300 V, COUT_EXT = 10000 µF,
RLOAD = 0.960 Ω
DCM3714xD2H26F0yzz
DCMin a VIA Package Rev 2.1
Page 13 of 23 07/2018
VICOR
General Characteristics
Specifications apply over all line, trim and load conditions, internal temperature TINT = 25ºC, unless otherwise noted. Boldface specifications apply over the
temperature range specified by the product grade.
Attribute Symbol Conditions / Notes Min Typ Max Unit
Mechanical [4]
Length L 94.88/[3.74] 95.13/[3.75] 95.38/[3.76] mm/[in]
Width W 35.29/[1.39] 35.54/[1.4] 35.79/[1.41] mm/[in]
Height H 9.02/[0.355] 9.4/[0.37] 9.78/[0.385] mm/[in]
Volume Vol No heat sink 31.44/[1.94] cm3/[in3]
Weight W 116.0/[4.10] g/[oz]
Pin Material C145 copper
Underplate Low stress ductile Nickel 50 100 µin
Pin Finish (Gold)
Palladium 0.8 6
µin
Soft Gold 0.12 2
Pin Finish (Tin) Whisker resistant matte Tin 200 400 µin
Thermal
Operating internal temperature [5] TINT
C-Grade -20 125 °C
T-Grade -40 125 °C
M-Grade -55 125 °C
Thermal resistance pin side θINT_PIN_SIDE
Estimated thermal resistance to maximum
temperature internal component from
isothermal pin/terminal side housing
1.96 °C/W
Thermal resistance housing θHOU
Estimated thermal resistance from pin-
side housing to non-pin-side housing 0.57 °C/W
Thermal resistance non-pin side θINT_NON_PIN_SIDE
Estimated thermal resistance to maximum
temperature internal component from
isothermal non-pin/non-terminal housing
2.19 °C/W
Thermal capacity 42.0 Ws/°C
Assembly
Storage temperature TST
C-Grade -20 125 °C
T-Grade -40 125 °C
M-Grade -65 125 °C
ESD rating
HBM Method per Human Body Model Test
ESDA/JEDEC JDS-001-2012 CLASS 1C
V
CDM Charged Device Model JESD22-C101E CLASS 2
Soldering [5]
Peak temperature top case For further information, please contact
factory applications 130 °C
[4] Product appearance may change over time depending upon environmental exposure. This change has no impact on product performance.
[5] Product is not intended for reflow solder attach.
[5] Temeperature refers to the internal operation of the DCM VIA. For maximum case temperature, please refer to figure 1.
DCM3714xD2H26F0yzz
DCMin a VIA Package Rev 2.1
Page 14 of 23 07/2018
VICOR
General Characteristics (Cont.)
Specifications apply over all line, trim and load conditions, internal temperature TINT = 25ºC, unless otherwise noted. Boldface specifications apply over the
temperature range specified by the product grade.
Attribute Symbol Conditions / Notes Min Typ Max Unit
Safety
Dielectric Withstand Test VHIPOT
IN to OUT 2121 Vdc
IN to CASE 2121 Vdc
OUT to CASE 707 Vdc
Reliability
MTBF
MIL-HDBK-217Plus Parts Count - 25°C
Ground Benign, Stationary, Indoors /
Compute
1.60 MHrs
Telcordia Issue 2 - Method I Case III; 25°C
Ground Benign, Controlled 2.00 MHrs
Agency Approvals
Agency approvals/standards
EN 60950-1
CE Marked for Low Voltage Directive and RoHS Recast Directive, as applicable
cURus,
cTÜVus,
DCM3714xD2H26F0yzz
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VICCJR
Pin Functions
+IN, -IN
Input power pins.
+OUT, -OUT
Output power pins. –Out also serves as reference for the secondary-
referenced control pins.
EN (Enable)
This pin enables and disables the DCM converter; when held low the
unit will be disabled. It is referenced to the -OUT pin of the converter.
EN is active only if VDDE is preapplied before VIN is applied.
Otherwise, EN is inactive and will be ignored until VIN is removed
and reapplied.
nOutput enable: When EN is allowed to pull up above the enable
threshold, the module will be enabled. If leaving EN floating, it is
pulled up to VCC and the module will be enabled.
nOutput disable: EN may be pulled down externally in order
to disable the module.
nEN is an input only, it does not pull low in the event of a fault.
TR (Trim)
The TR pin is used to select the trim mode and to trim the output
voltage of the DCM converter. The TR pin has an internal pull-up
to VCC.
The DCM will latch trim behavior at application of VIN (once VIN
exceeds VIN-UVLO+), and persist in that same behavior until loss of
input voltage.
nAt application of VIN, if TR is sampled at above VTRIM-DIS, the
module will latch in a non-trim mode, and will ignore the TR
input for as long as VIN is present.
nAt application of VIN, if TR is sampled at below VTRIM-EN, the TR
will serve as an input to control the real time output voltage. It
will persist in this behavior until VIN is no longer present.
If trim is active when the DCM is operating, the TR pin provides
dynamic trim control at a typical 250 Hz of -3dB bandwidth over the
output voltage. TR also decreases the current limit threshold when
trimming above VOUT-NOM.
+SENSE, –SENSE
These pins are Remote Sense pins, which allow the users to sense the
voltage at the point of load so that the DCM can use the load voltage
to regulate its output voltage accordingly. If “+SENSE” and “–SENSE”
are floating, Local Sense is implemented automatically.
However, when SENSE pins are floating, the regulation accuracy
deteriorates (see "VOUT accuracy with Sense pin floating" on
Page 5). To achieve maximum regulation accuracy, the SENSE pins
should be used also for local sense operation, by connecting them
directly to their respective OUT pins (+SENSE to +OUT and
-SENSE to -OUT).
Please note: For chassis mount models, Vicor part number 42550
will be needed for applications requiring the use of signal pins
(Enable, Trim and Sense functions).
Design Guidelines
Building Blocks and System Design
The DCM converter input accepts the full 200.0 to 420.0 V range, and
it generates an isolated trimmable 24.0 Vdc output.
The DCM converter provides a tightly regulated output voltage. With
trim inactive (TR pin floating), regulation accuracy is within 0.5% of
the setpoint for all line conditions and for any load above 10% of the
rated load. With trim active, regulation accuracy is within 2.0% for
all line conditions and for any load condition above 10%
of the rated load.
The DCM3714xD2H26F0yzz is designed to be used in applications
where the output power requirements are up to 600 W.
Soft Start
When the DCM starts, it will go through a soft start. The soft start
routine ramps the output voltage by modulating the internal error
amplifier reference. This causes the output voltage to approximate a
piecewise linear ramp. The output ramp finishes when the voltage
reaches either the nominal output voltage, or the trimmed output
voltage in cases where trim mode is active.
During soft-start, the maximum load current capability is reduced.
Until Vout achieves at least VOUT-FL-THRESH, the output current must be
less than IOUT-START in order to guarantee startup. Note that this is
current available to the load, above that which is required to charge
the output capacitor.
Trim Mode and Output Trim Control
When the input voltage is initially applied to a DCM, and after tINIT
elapses, the trim pin voltage VTR is sampled. The TR pin has an
internal pull up resistor to VCC, so unless external circuitry pulls the
pin voltage lower, it will pull up to VCC. If the initially sampled trim
pin voltage is higher than VTRIM-DIS, then the DCM will disable
trimming as long as the VIN remains applied. In this case, for all
subsequent operation the output voltage will be programmed to the
nominal. This minimizes the support components required for
applications that only require the nominal rated VOUT, and also
provides the best output setpoint accuracy, as there are no additional
errors from external trim components.
If at initial application of VIN, the TR pin voltage is prevented from
exceeding VTRIM-EN, then the DCM will activate trim mode, and it will
remain active for as long as VIN is applied.
VOUT set point can be calculated using the equation below:
VOUT-TRIMMING = 13.200 + (15.024 • VTR/VCC) (1)
Note that the trim mode is not changed when a DCM recovers from
any fault condition or being disabled.
Module performance is guaranteed through output voltage trim
range VOUT-TRIMMING. If VOUT is trimmed above this range, then certain
combinations of line and load transient conditions may trigger the
output OVP.
Output Current Limit
The DCM features a fully operational current limit which effectively
keeps the module operating inside the Safe Operating Area (SOA) for
all valid trim and load profiles. The current limit approximates a
“brick wall” limit, where the output current is
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prevented from exceeding the current limit threshold by reducing
the output voltage via the internal error amplifier reference. The
current limit threshold at nominal trim and below is typically 115%
of rated output current, but it can vary between 100% to 135%. In
order to preserve the SOA, when the converter is trimmed above the
nominal output voltage, the current limit threshold is automatically
reduced to limit the available output power.
When the output current exceeds the current limit threshold, current
limit action is held off by 1ms, which permits the DCM to
momentarily deliver higher peak output currents to the load. Peak
output power during this time is still constrained by the internal
Power Limit of the module. The fast Power Limit and relatively slow
Current Limit work together to keep the module inside the SOA.
Delaying entry into current limit also permits the DCM to minimize
droop voltage for load steps.
Sustained operation in current limit is permitted, and no derating of
output power is required.
Current limit can reduce the output voltage to as little as the UVP
threshold (VOUT-UVP). Below this minimum output voltage
compliance level, further loading will cause the module to shut
down due to the output undervoltage fault protection.
Line Impedance, Input Slew rate and Input Stability Requirements
Connect a high-quality, low-noise power supply to the +IN and –IN
terminals. Additional capacitance may have to be added between +IN
and –IN to make up for impedances in the interconnect cables as
well as deficiencies in the source.
Excessive source impedance can bring about system stability issues
for a regulated DC-DC converter, and must either be avoided or
compensated. A 100 µF input capacitor is the minimum
recommended in case the source impedance is insufficient to satisfy
stability requirements.
Additional information can be found in the filter design application
note:
www.vicorpower.com/documents/application_notes/vichip_appnote23.pdf
Please refer to this input filter design tool to ensure input stability:
http://app2.vicorpower.com/filterDesign/intiFilter.do.
Ensure that the input voltage slew rate is less than 1V/us, otherwise a
pre-charge circuit is required for the DCM input to control the input
voltage slew rate and prevent overstress to input stage components.
Input Fuse Selection
The DCM is not internally fused in order to provide flexibility in
configuring power systems. Input line fusing is recommended at the
system level, in order to provide thermal protection in case of
catastrophic failure. The fuse shall be selected by closely matching
system requirements with the following characteristics:
nCurrent rating (usually greater than the DCM converter’s
maximum current)
nMaximum voltage rating (usually greater than the maximum
possible input voltage)
nAmbient temperature
nBreaking capacity per application requirements
nNominal melting I2t
nRecommended fuse: See Agency Approvals for Recommended Fuse
http://www.vicorpower.com
Fault Handling
Input Undervoltage Fault Protection (UVLO)
The converter’s input voltage is monitored to detect an input under
voltage condition. If the converter is not already running, then it will
ignore enable commands until the input voltage is greater than
VIN-UVLO+. If the converter is running and the input voltage falls
below VIN-UVLO-, the converter recognizes a fault condition, the
powertrain stops switching, and the output voltage of the unit falls.
Input voltage transients which fall below UVLO for less than tUVLO
may not be detected by the fault protection logic, in which case the
converter will continue regular operation. No protection is required
in this case.
Once the UVLO fault is detected by the fault protection logic, the
converter shuts down and waits for the input voltage to rise above
VIN-UVLO+. Provided the converter is still enabled, it will then restart.
Input Overvoltage Fault Protection (OVLO)
The converter’s input voltage is monitored to detect an input over
voltage condition. When the input voltage is more than the
VIN-OVLO+, a fault is detected, the powertrain stops switching, and the
output voltage of the converter falls.
After an OVLO fault occurs, the converter will wait for the input
voltage to fall below VIN-OVLO-. Provided the converter is still enabled,
the powertrain will restart.
The powertrain controller itself also monitors the input voltage.
Transient OVLO events which have not yet been detected by the fault
sequence logic may first be detected by the controller if the input
slew rate is sufficiently large. In this case, powertrain switching will
immediately stop. If the input voltage falls back in range before the
fault sequence logic detects the out of range condition, the
powertrain will resume switching and the fault logic will not
interrupt operation. Regardless of whether the powertrain is running
at the time or not, if the input voltage does not recover from OVLO
before tOVLO, the converter fault logic will detect the fault.
Output Undervoltage Fault Protection (UVP)
The converter determines that an output overload or short circuit
condition exists by measuring its output voltage and the output of
the internal error amplifier. In general, whenever the powertrain is
switching and the output voltage falls below VOUT-UVP threshold, a
short circuit fault will be registered. Once an output undervoltage
condition is detected, the powertrain immediately stops switching,
and the output voltage of the converter falls. The converter remains
disabled for a time tFAULT. Once recovered and provided the converter
is still enabled, the powertrain will again enter the soft start
sequence after tINIT and tON.
Temperature Fault Protections (OTP)
The fault logic monitors the internal temperature of the converter. If
the measured temperature exceeds TINT-OTP, a temperature fault is
registered. As with the under voltage fault protection, once a
temperature fault is registered, the powertrain immediately stops
switching, the output voltage of the converter falls, and the converter
remains disabled for at least time tFAULT. Then, the converter waits for
the internal temperature to return to below TINT-OTP before
recovering. Provided the converter is still enabled, the DCM will
restart after tINIT and tON.
DCM3714xD2H26F0yzz
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+5 )‘H +67 +67 VICOR
Output Overvoltage Fault Protection (OVP)
The converter monitors the output voltage during each switching
cycle. If the output voltage exceeds VOUT-OVP, the OVP fault protection
is triggered. The control logic disables the powertrain, and the output
voltage of the converter falls.
This type of fault is latched, and the converter will not start again
until the latch is cleared. Clearing the fault latch is achieved by either
disabling the converter via the EN pin, or else by removing the input
power such that the input voltage falls below VIN-INIT.
External Output Capacitance
The DCM converter internal compensation requires a minimum
external output capacitor. An external capacitor in the range of 1000
to 10000 µF with ESR of 10 mΩ is required for control loop
compensation purposes.
However some DCM models require an increase to the minimum
external output capacitor value in certain loading condition. In
applications where the load can go below 2% of rated load, the range
of output capacitor required is given by
COUT-EXT-TRANSIENT in the Electrical Specifications table.
Thermal Considerations
The VIA package provides effective conduction cooling from either of
the two module surfaces. Heat may be removed from the pin-side
surface, the non-pin-side surface or both. The extent to which these
two surfaces are cooled is a key component for determining the
maximum power that can be processed by a DCM in a VIA package,
as can be seen from specified thermal operating area on Page 4. Since
the VIA package has a maximum internal temperature rating, it is
necessary to estimate this internal temperature based on a system-
level thermal solution. To this purpose, it is helpful to simplify the
thermal solution into a roughly equivalent circuit where power
dissipation is modeled as a current source, isothermal surface
temperatures are represented as voltage sources and the thermal
resistances are represented as resistors. Figure 18 shows the “thermal
circuit” for the VIA package.
In this case, the internal power dissipation is PDISS, θINT_PIN_SIDE and
θINT_NON_PIN_SIDE are thermal resistance characteristics of the VIA
package and the pin-side and non-pin-side surface temperatures are
represented as TC_PIN_SIDE, and TC_NON_PIN_SIDE. It is interesting to notice
that the package itself provides a high degree of thermal coupling
between the pin-side and non-pin-side case surfaces (represented in
the model by the resistor θHOU). This feature enables two main
options regarding thermal designs:
nSingle side cooling: the model of Figure 18 can be simplified by
calculating the parallel resistor network and using one simple
thermal resistance number and the internal power dissipation
curves; an example for non-pin side cooling only is shown in
Figure 19.
In this case, θINT can be derived as following:
nDouble side cooling: while this option might bring limited
advantage to the module internal components (given the
surface-to-surface coupling provided), it might be appealing in
cases where the external thermal system requires allocating
power to two different elements, like for example heatsinks with
independent airflows or a combination of chassis/air cooling.
Grounding Considerations
The chassis of the VIA package is required to be connected to
Protective Earth when installed in the end application and must
satisfy the requirements of IEC 60950-1 for Class I products. Both
sides of the housing are required to be connected to Protective Earth
to satisfy safety and EMI requirements. Protective earthing can be
accomplished through dedicated wiring harness (example: ring
terminal clamped by mounting screw) or surface contact (example:
pressure contact on bare conductive chassis or PCB copper layer
with no solder mask).
Dielectric Withstand
The VIA package contains an internal safety approved isolating
component (VI ChiP) that provides the Reinforced Insulation from
Input to Output. The isolating component is individually tested for
Reinforced Insulation from Input to Output at 4242 Vdc prior to the
final assembly of the VIA.
When the VIA assembly is complete the Reinforced Insulation can
only be tested at Basic Insulation values as specified in the electric
strength Test Procedure noted in clause 5.2.2 of IEC 60950-1.
PDISS
+
TC_PIN_SIDE
θHOU
s
s
+
θINT_NON_
PIN_SIDE
θINT_PIN_SIDE
TC_NON_
PIN_SIDE
Figure 18 – Double sided cooling VIA thermal model
P
DISS
+
θ
INT
s
s
T
C_NON_
PIN_SIDE
Figure 19 – Single-sided cooling VIA thermal model
INT_PIN_SIDE + θHOU) θINT_NON_PIN_SIDE
θINT
=
θINT_PIN_SIDE + θHOU + θINT_NON_PIN_SIDE
DCM3714xD2H26F0yzz
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w amp Lso‘auon mpm Ompul ‘ ‘ SELV VICOR
Test Procedure Note from IEC 60950-1
“For equipment incorporating both REINFORCED INSULATION and
lower grades of insulation, care is taken that the voltage applied to
the REINFORCED INSULATION does not overstress BASIC
INSULATION or SUPPLEMENTARY INSULATION.
Summary
The final VIA assembly contains basic insulation from input to case,
reinforced insulation from input to output, and functional insulation
from output to case.
The output of the VIA complies with the requirements of SELV
circuits so only functional insulation is required from the output
(SELV) to case (PE) because the case is required to be connected to
protective earth in the final installation. The construction of the VIA
can be summarized by describing it as a “Class II” component
installed in a “Class I” subassembly. The reinforced insulation from
input to output can only be tested at a basic insulation value of
2121 Vdc on the completely assembled VIA product.
SELV
Output
RI
Input
VI ChiP Isolation
Figure 20 – VI Chip before final assembly in the VIA
SELV
VI ChiP
VIA Output Circ uit
VIA DCM Isolation
BI
Input
RI
Output
FI
VIA Input Circuit
PE
Figure 21 – DCM VIA after final assembly
DCM3714xD2H26F0yzz
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i6: gflnmiqfluuwazégflfis VICOR
DCM in a VIA package Module Mechanical Drawing - PCB Mount Type
BOTTOM SIDE
1
2
3
4
10 12
11 13
TOP VIEW
(COMPONENT SIDE)
5
6
7
8
9
2
1
11
10
13
12
4
3
SEE DETAIL 'A'
RECOMMENED HOLE PATTERN
DETAIL A
SCALE 8 : 1
9
8
7
6
5
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DCM3714xD2H26F0yzz
DCMin a VIA Package Rev 2.1
Page 20 of 23 07/2018
:2? M £225 :2... $332; VICOR
DCM in a VIA package Module Mechanical Drawing - Chassis Mount Type
)RUFKDVVLVPRXQWPRGHOV
9LFRUSDUWQXPEHUZLOOEHQHHGHGIRU
DSSOLFDWLRQVUHTXLULQJWKHXVHRIVLJQDOSLQV
1.171
29.750
.11
2.90
DIM 'A'
DIM 'B'
.15
3.86
THRU
TYP
INPUT
INSERT
(41816)
TO BE
REMOVED
PRIOR
TO USE
OUTPUT
INSERT
(41817)
TO BE
REMOVED
PRIOR
TO USE

5('

86(7<&2/8*25
(48,9)25,1387&211(&7,21
$//352'8&76
USE TYCO LUG #696049-1 OR EQUIVALENT
FOR PRODUCTS WITH - OUT RETURN TO CASE,
USE TYCO LUG #2-36161-6 OR EQUIVALENT
FOR ALL OTHER PRODUCTS.
1
2
3
4
DIM 'C'
23.98
609.14
.37±.015
9.40±.381
.010 [.254]
1.40
35.54
PRODUCT
DIM 'A'
DIM 'B'
DIM 'C'
3414 DCM
1.61 [40.93]
.788 [20.005] 3.38 [85.93]
3714 DCM
1.61 [40.93]
1.150 [29.200] 3.75 [95.13]
3814 NBM - OUT RETURN TO CASE
1.02 [25.96]
1.277 [32.430] 3.76 [95.59]
3814 BCM - OUT RETURN TO CASE
1.02 [25.96]
1.277 [32.430] 3.76 [95.59]
4414 BCM
1.61 [40.93]
1.757 [44.625] 4.35 [110.55]
4414 BCM - OUT RETURN TO CASE
1.61 [40.93]
1.277 [32.430] 4.35 [110.55]
4414 UHV BCM
1.65 [41.93]
1.718 [43.625] 4.35 [110.55]
4414 PFM
1.61 [40.93]
1.757 [44.625] 4.35 [110.55]
4414 PFM 3kV
1.61 [40.93]
1.658 [42.110] 4.35 [110.55]
4914 PFM
2.17 [55.12]
1.757 [44.625] 4.91 [124.75]
81/(6627+(5:,6(63(&,),('',0(16,216$5(,1&+>00@
DCM3714xD2H26F0yzz
DCMin a VIA Package Rev 2.1
Page 21 of 23 07/2018
Rev Date Description Page Number(s) 1 0 09/03/15 lntrtal release n/a 1 1 09/30/15 Added graphrc relerence on Pln Conflgurallon 3 1 2 10/01/15 Updated tnm resolutron value 7 1 3 10/13/15 Updated peak elhcrency & case temperature 1 1 4 12/17/15 Added VDDE current consumptron spec 7 1 5 02/16/16 Updated prn conhguratron and pln descrrptrons 3 1 5 03/3l/16 Updated thermal capacrtance value 14 Updated agency approval 1 at 15 Updated hgure 1 4 1 7 05/05/16 Updated trmmg dragram notes page 9 at 10 Updated thermal capacrty spec 1A 1 0 01/09/17 Updated Note [2] 4 Added McGrzde temperature ratrng m Pan 0rdenng lnlormatron table 1 1 9 03/22/17 Updated values on Herght 14 Added Pln Materral, Underplate at Pm Flrllsh rnldrmatron ln General characterrstrcs table 14 Updated Mechanrcal Drawrngs 20 0 21 Updated typrcal applrcatrdn bullets 1 Updated product photos 1 Updated efflclency speclllcatldns 1n Power Output Speclflcatlons 5 2 0 07/13/17 Updated rnput overvoltage lockoUl/remvery threshold (powenrarn protectrons) 6 values to match the OVLD operatlng p01an of the product Moved remote sense rated voltage drop value to maxrmum column 3 Updated mechanrcal drawmgs (rncludrng new hexehead screws) 20 0 21 2 1 Updated mechanrcal drawmgs 20 0 21 VICCJR
Revision History
Revision Date Description Page Number(s)
1.0 09/08/15 Intital release n/a
1.1 09/30/15 Added graphic reference on Pin Configuration 3
1.2 10/01/15 Updated trim resolution value 7
1.3 10/13/15 Updated peak efficiency & case temperature 1
1.4 12/17/15 Added VDDE current consumption spec 7
1.5 02/16/16 Updated pin configuration and pin descriptions 3
1.6 03/31/16 Updated thermal capacitance value 14
Updated agency approval 1 & 15
1.7 05/05/16 Updated figure 1 4
Updated timing diagram notes page 9 & 10
Updated thermal capacity spec 14
1.8 01/09/17 Updated Note [2] 4
Added M-Grade temperature rating in Part Ordering Information table 1
1.9 03/22/17 Updated values on Height 14
Added Pin Material, Underplate & Pin Finish information in General Characteristics table 14
Updated Mechanical Drawings 20 & 21
Updated typical application bullets 1
Updated product photos 1
Updated efficiency specifications in Power Output Specifications 5
2.0 07/18/17 Updated input overvoltage lockout/recovery threshold (powertrain protections) 6
values to match the OVLO operating points of the product
Moved remote sense rated voltage drop value to maximum column 8
Updated mechanical drawings (including new hex-head screws) 20 & 21
2.1 Updated mechanical drawings 20 & 21
DCM3714xD2H26F0yzz
DCMin a VIA Package Rev 2.1
Page 22 of 23 07/2018
07/26/18
VICCJR
DCM3714xD2H26F0yzz
Vicor’s comprehensive line of power solutions includes high density AC-DC and DC-DC modules and
accessory components, fully configurable AC-DC and DC-DC power supplies, and complete custom
power systems.
Information furnished by Vicor is believed to be accurate and reliable. However, no responsibility is assumed by Vicor for its use. Vicor
makes no representations or warranties with respect to the accuracy or completeness of the contents of this publication. Vicor reserves
the right to make changes to any products, specifications, and product descriptions at any time without notice. Information published by
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Testing and other quality controls are used to the extent Vicor deems necessary to support Vicor’s product warranty. Except where
mandated by government requirements, testing of all parameters of each product is not necessarily performed.
Specifications are subject to change without notice.
Visit http://www.vicorpower.com/dc-dc/isolated-regulated/dcm for the latest product information.
Vicor’s Standard Terms and Conditions and Product Warranty
All sales are subject to Vicor’s Standard Terms and Conditions of Sale, and Product Warranty which are available on Vicor’s webpage
(http://www.vicorpower.com/termsconditionswarranty) or upon request.
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VICOR’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE
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herein, life support devices or systems are devices which (a) are intended for surgical implant into the body, or (b) support or sustain life and
whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected to
result in a significant injury to the user. A critical component is any component in a life support device or system whose failure to perform
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and Conditions of Sale, the user of Vicor products and components in life support applications assumes all risks of such use and indemnifies
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The products described on this data sheet are protected by the following U.S. Patents Numbers:
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www.vicorpower.com
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DCMin a VIA Package Rev 2.1
Page 23 of 23 07/2018

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