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date 04/10/2017
page 1 of 12
SERIES: VFB600 DESCRIPTION: DC-DC CONVERTER
FEATURES
• up to 700 W isolated output
• industry standard full brick package
• 2:1 input range (18~36 Vdc, 36~75 Vdc)
• single output from 12~48 Vdc
• 1,500 Vdc isolation
• over current, over temperature, over voltage,
and short circuit protections
• remote on/off
• efficiency up to 92%
PART NUMBER KEY
VFB600 - DXX - SXX X
MODEL input
voltage
output
voltage
output
current
output
power
ripple
and noise1
efficiency
typ
(Vdc)
range
(Vdc) (Vdc)
max
(A)
max
(W)
max
(mVp-p)
typ
(%)
VFB600-D24-S12 24 18~36 12 50 600 120 88
VFB600-D24-S24 24 18~36 24 25 600 240 90
VFB600-D24-S28 24 18~36 28 21.5 600 280 90
VFB600-D24-S32 24 18~36 32 19 600 320 91
VFB600-D24-S48 24 18~36 48 12.5 600 480 91
VFB600-D48-S12 48 36~75 12 50 600 120 90
VFB600-D48-S24 48 36~75 24 25 600 240 92
VFB600-D48-S28 48 36~75 28 25 700 280 91
VFB600-D48-S32 48 36~75 32 19 600 320 92
VFB600-D48-S48 48 36~75 48 12.5 600 480 92
Notes: 1.Rippleandnoisemeasuredatfullload,20MHzBWwith10μFtantalumand1μFceramiccapacitoracrosstheoutput.
2.Anexternalinputcapacitorof220μFisrecommendedtoreduceinputripplevoltage.
3.Allspecificationsmeasuredatnominalline,fullload,and25°Cunlessotherwisespecified.
Output VoltageInput Voltage
Base Number RemoteOn/OffControl
"blank" = positive logic
N = negative logic
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CUI Inc SERIES: VFB600 DESCRIPTION: DC-DC CONVERTER date 04/10/2017 page 2 of 12
INPUT
parameter conditions/description min typ max units
operating input voltage 24 Vdc input models
48 Vdc input models
18
36
24
48
36
75
Vdc
Vdc
under voltage shutdown
24 Vdc input power up
power down
17
16
Vdc
Vdc
48 Vdc input power up
power down
35
33
Vdc
Vdc
over voltage shutdown
24 Vdc input power up
power down
38
40
Vdc
Vdc
48 Vdc input power up
power down
77
80
Vdc
Vdc
start-up time 250 ms
on/off1
positive logic models ON (0~0.01 mA)
models OFF (1.0~10 mA)
negative logic models ON (1.0~10 mA)
models OFF (0~0.01 mA)
filter pifilter
input fuse 60 A time delay fuse for 24 Vin models,
30 A time delay fuse for 48 Vin models
Note: 1. See application notes.
OUTPUT
parameter conditions/description min typ max units
output capacitance212 Vdc output models
all other models
470
470
10,000
5,000
μF
μF
line regulation2from low line to high line ±0.2 %
load regulation2from full load to no load ±0.5 %
voltage accuracy2±1.5 %
load share accuracy from 50~100% load ±10 %
adjustability 60 110 %
switching frequency 48 Vdc input: 12 Vdc, 28 Vdc, 32 Vdc models
all other models
300
250
kHz
kHz
transient response 25% load step change 500 μs
temperaturecoefficient ±0.03 %/°C
powergood(IOC) Vout ready: low level, sink current
Vout not ready: open drain output, applied voltage
20
50
mA
V
auxiliary output voltage/current 10 ±3 Vdc, 20 mA max.
Note: 2.Minimumcapacitorvaluesarerequiredontheoutputtomaintainthespecifiedregulation.
PROTECTIONS
parameter conditions/description min typ max units
short circuit protection continuous
over current protection 110 150 %
over voltage protection 115 140 %
over temperature protection shutdown 110 °C
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SAFETY AND COMPLIANCE
parameter conditions/description min typ max units
isolation voltage for 1 minute, input to output, input to case, or
output to case 1,500 Vdc
isolation resistance 10 MΩ
isolation capacitance 4,000 pF
safety approvals UL 60950-1
MTBF asperMIL-HDBK-217Fatfullload,GB,25°C 450,000 hours
RoHS 2011/65/EU(CE)
ENVIRONMENTAL
parameter conditions/description min typ max units
operating case temperature see derating curve -40 100 °C
storage temperature -55 105 °C
humidity non-condensing 95 %
SOLDERABILITY
parameter conditions/description min typ max units
wave soldering seewavesolderingprofile 260 °C
MECHANICAL
parameter conditions/description min typ max units
dimensions 116.8 x 61.0 x 12.7(4.60 x 2.40 x 0.50 inch) mm
case material aluminum baseplate with plastic case
weight 220 g
0
50
100
150
200
250
300
020406080100 120140 160 180
Time (Seconds)
Temperature (°C)
Notes: 1.Solderingmaterials:Sn/Cu/Ni
 2.Rampuprateduringpreheat:1.4°C/s(from50°Cto100°C)
 3.Soakingtemperature:0.5°C/s(from100°Cto130°C),60±20seconds
 4.Peaktemperature:260°C,above250°Cfor3~6seconds
 5.Rampdownrateduringcooling:-10°C/s(from260°Cto150°C)
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CUI Inc SERIES: VFB600 DESCRIPTION: DC-DC CONVERTER date 04/10/2017 page 4 of 12
85.06 3.349
88.87 3.499
92.68 3.649
96.49 3.799
100.30 3.949
1.701
43.20
57.17 2.251
50.80 2.000
35.56 1.400
22.86 0.900
10.16 0.400
106.70 4.201
5.05 0.199
19.07 0.751
22.88 0.901
33.04 1.301
104.11 4.099
2
2.06 0.081
(8 PLCS)
(8 PLCS)
1.02 0.040
3.50
(4 PLCS)
THROUGH HOLE
0.138
61.00 2.402
9
1
4
5
6
10
3
7
8
16
15
14
13
12
11
12.70 0.500
4.598
116.80
7.20 0.283
(TYP)
3.5mm NON THROUGH HOLE
2.4mm PLATED THROUGH HOLE
4.8mm PAD SIZE
1.4mm PLAT ED THROUGH HOLE
2.8mm PAD SIZE
PCB Layout
Top View
MECHANICAL DRAWING
PINCONNECTIONS
Pin Function
1 -Vin
2 +Vin
3 -ON/OFF
4 +ON/OFF
5+Vo
6+Vo
7+Vo
8-Vo
9-Vo
10 -Vo
11 -S
12 +S
13 TRIM
14 PC/NC
15 IOC
16 AUX
units: mm[inch]
tolerance: X.X = ±0.5[±0.02]
X.XX = ±0.25[±0.010]
pin diameter tolerance: ±0.1[±0.004]
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CUI Inc SERIES: VFB600 DESCRIPTION: DC-DC CONVERTER date 04/10/2017 page 5 of 12
0
10
20
30
40
50
60
70
80
90
100
110
-40-30 -20-10 0102030405060708090100
Load (%)
Ambient Temperature (°C)
400 ft./min (2.0 m/s)
800 ft./min (4.0 m/s)
Natural Convention
20 ft./min (0.1 m/s)
0
10
20
30
40
50
60
70
80
90
100
110
-40-30 -20-10 0102030405060708090100
Load (%)
Ambient Temperature (°C)
400 ft./min (2.0 m/s)
800 ft./min (4.0 m/s)
Natural Convention
20 ft./min (0.1 m/s)
0
10
20
30
40
50
60
70
80
90
100
110
-40-30 -20-10 0102030405060708090100
Load (%)
Ambient Temperature (°C)
400 ft./min (2.0 m/s)
800 ft./min (4.0 m/s)
Natural Convention
20 ft./min (0.1 m/s)
0
10
20
30
40
50
60
70
80
90
100
110
-40-30 -20-10 0102030405060708090100
Load (%)
Ambient Temperature (°C)
400 ft./min (2.0 m/s)
800 ft./min (4.0 m/s)
Natural Convention
20 ft./min (0.1 m/s)
0
10
20
30
40
50
60
70
80
90
100
110
-40-30 -20-10 0102030405060708090100
Load (%)
Ambient Temperature (°C)
400 ft./min (2.0 m/s)
800 ft./min (4.0 m/s)
Natural Convention
20 ft./min (0.1 m/s)
DERATING CURVES
VFB600-D24-S12DeratingCurves VFB600-D24-S24DeratingCurves
VFB600-D24-S32DeratingCurvesVFB600-D24-S28DeratingCurves
VFB600-D24-S48DeratingCurves
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CUI Inc SERIES: VFB600 DESCRIPTION: DC-DC CONVERTER date 04/10/2017 page 6 of 12
DERATING CURVES (CONTINUED)
0
10
20
30
40
50
60
70
80
90
100
110
-40-30 -20-10 0102030405060708090100
Load (%)
Ambient Temperature (°C)
400 ft./min (2.0 m/s)
800 ft./min (4.0 m/s)
Natural Convention
20 ft./min (0.1 m/s)
0
10
20
30
40
50
60
70
80
90
100
110
-40-30 -20-10 0102030405060708090100
Load (%)
Ambient Temperature (°C)
400 ft./min (2.0 m/s)
800 ft./min (4.0 m/s)
Natural Convention
20 ft./min (0.1 m/s)
0
10
20
30
40
50
60
70
80
90
100
110
-40-30 -20-10 0102030405060708090100
Load(%)
Ambient Temperature (°C)
400 ft./min (2.0 m/s)
800 ft./min (4.0 m/s)
Natural Convention
20 ft./min (0.1 m/s)
0
10
20
30
40
50
60
70
80
90
100
110
-40-30 -20-10 0102030405060708090100
Load (%)
Ambient Temperature (°C)
400 ft./min (2.0 m/s)
800 ft./min (4.0 m/s)
Natural Convention
20 ft./min (0.1 m/s)
0
10
20
30
40
50
60
70
80
90
100
110
-40-30 -20-10 0102030405060708090100
Load (%)
Ambient Temperature (°C)
400 ft./min (2.0 m/s)
800 ft./min (4.0 m/s)
Natural Convention
20 ft./min (0.1 m/s)
VFB600-D48-S12DeratingCurves
VFB600-D48-S28DeratingCurves
VFB600-D48-S48DeratingCurves
VFB600-D48-S24DeratingCurves
VFB600-D48-S32DeratingCurves
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EFFICIENCY CURVES
60
65
70
75
80
85
90
95
10 20 30 40 50 60 70 80 90 100
18 Vdc
24 Vdc
36 Vdc
Load Current (%)
Efficiency (%)
VFB600-D24-S28EfficiencyCurve
(Efficiencyvs.LineVoltageandLoadCurrent)
60
65
70
75
80
85
90
95
10 20 30 40 50 60 70 80 90 100
18 Vdc
24 Vdc
36 Vdc
Load Current (%)
Efficiency (%)
VFB600-D24-S32EfficiencyCurve
(Efficiencyvs.LineVoltageandLoadCurrent)
60
65
70
75
80
85
90
95
10 20 30 40 50 60 70 80 90 100
18 Vdc
24 Vdc
36 Vdc
Efficiency (%)
Load Current (%)
VFB600-D24-S12EfficiencyCurve
(Efficiencyvs.LineVoltageandLoadCurrent)
60
65
70
75
80
85
90
95
10 20 30 40 50 60 70 80 90 100
18 Vdc
24 Vdc
36 Vdc
Efficiency (%)
Load Current (%)
VFB600-D24-S24EfficiencyCurve
(Efficiencyvs.LineVoltageandLoadCurrent)
60
65
70
75
80
85
90
95
10 20 30 40 50 60 70 80 90 100
18 Vdc
24 Vdc
36 Vdc
Load Current (%)
Efficiency (%)
VFB600-D24-S48EfficiencyCurve
(Efficiencyvs.LineVoltageandLoadCurrent)
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EFFICIENCY CURVES (CONTINUED)
60
65
70
75
80
85
90
95
10 20 30 40 50 60 70 80 90 100
36 Vdc
48 Vdc
75 Vdc
Efficiency (%)
Load Current (%)
VFB600-D48-S28EfficiencyCurve
(Efficiencyvs.LineVoltageandLoadCurrent)
60
65
70
75
80
85
90
95
10 20 30 40 50 60 70 80 90 100
36 Vdc
48 Vdc
75 Vdc
Efficiency (%)
Load Current (%)
VFB600-D48-S32EfficiencyCurve
(Efficiencyvs.LineVoltageandLoadCurrent)
60
65
70
75
80
85
90
95
10 20 30 40 50 60 70 80 90 100
36 Vdc
48 Vdc
75 Vdc
Efficiency (%)
Load Current (%)
VFB600-D48-S12EfficiencyCurve
(Efficiencyvs.LineVoltageandLoadCurrent)
60
65
70
75
80
85
90
95
10 20 30 40 50 60 70 80 90 100
36 Vdc
48 Vdc
75 Vdc
Load Current (%)
Efficiency (%)
VFB600-D48-S24EfficiencyCurve
(Efficiencyvs.LineVoltageandLoadCurrent)
60
65
70
75
80
85
90
95
10 20 30 40 50 60 70 80 90 100
36 Vdc
48 Vdc
75 Vdc
Load Current (%)
Efficiency (%)
VFB600-D48-S48EfficiencyCurve
(Efficiencyvs.LineVoltageandLoadCurrent)
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J E E a; W y R J E E E E;
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CUI Inc SERIES: VFB600 DESCRIPTION: DC-DC CONVERTER date 04/10/2017 page 9 of 12
Figure 1
StandardParallelConnection
Figure 3
N+1RedundantConnection
Figure 2
ParallelConnectionWithProgrammedAndAdjustableOutput
Figure 4
N+1RedundantConnectionWithProgrammedOutputAndAdjustable
Output Voltage
+S
+V
-V
-S
PC
+S
+V
-V
-S
PC
L
O
A
D
+S
+V
-V
-S
PC
TRIM
TRIM
+S
+V
-V
-S
PC
L
O
A
D
+S
+V
-V
-S
PC
+S
+V
-V
-S
PC
L
O
A
D
TRIM
TR
IM
+S
+V
-V
-S
PC
+S
+V
-V
-S
PC
L
O
A
D
APPLICATION NOTES
1. Parallel Operation
The VFB600 series is designed for parallel operation. When in parallel the load current can be shared equally between the two
modulesbyconnectingtheirPCpins.TheVFB600canbesetupintwodifferentmodestoachieveparalleloperation.Thestandard
parallel operation is suitable when load cannot be handled by a single unit, whereas the N+1 redundant operation is suitable for loads
when backup power is required.
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CUI Inc SERIES: VFB600 DESCRIPTION: DC-DC CONVERTER date 04/10/2017 page 10 of 12
(A) ControllingtheON/OFFterminalfromtheinputside.
 RecommendedR1valueis30kΩ(0.5W)for48VIN and
 15kΩ(0.25W)for24VIN
(B) ControllingtheON/OFFterminalfromtheoutput 
 side.RecommendedR2valueis5.1kΩ(0.1W)
1k
AUX
-S
-ON/OFF
+ON/OFF
SW
Output
I(ON/OFF)
R2
Figure 6
ExternalDCVoltage
Figure 7 Figure 8
APPLICATION NOTES (CONTINUED)
+S
+V
-V
-S
VR
Rt
Rt
Rt
Rt
Vf
+
×
+
+
×
×
=
33
33
7. 86
)
33
33
(
)
(
1. 42
VfVRVoVout ×+=)(
V
T
V
O
Vout ×=
2. Output Voltage Trimming
Leave open if not used.
3. ON/OFF Control
The converter's ON/OFF function can be controlled from the input side or from the output side. The maximum current through the
ON/OFF pin is 10 mA. The resistor value has to be set appropriately to avoid the maximum current through the ON/OFF pins. The
remoteon/offcontrolhastobeconnectedfortheconvertertooperate.
Figure 5
External Resistors
Trim-Up/Trim-Down Formulas
Trim-Up/Trim-Down Formula
Note:Rt=6.8kΩ
VO is the nominal output voltage
VOUT is the desired output voltage (up or down)
VRisthetrimresistorinkΩ
Note: VT is the trim terminal voltage
VO is the nominal output voltage
VOUT is the desired output voltage (up or down)
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CUI Inc SERIES: VFB600 DESCRIPTION: DC-DC CONVERTER date 04/10/2017 page 11 of 12
Figure 9
Internal AUX Power
Figure 10
ExternalDCPower
APPLICATION NOTES (CONTINUED)
4. IOC Signal
NormalandabnormaloperationoftheconvertercanbemonitoredbyusingtheI.O.Csignal.Outputofthissignalmonitorislocated
atthesecondarysideandisopencollectoroutput,youcanusethesignalbytheinternalauxpowersupplyorthetheexternalDC
supply as the following figures. the ground reference is the –Sense. This signal is LOW when the converter is normally operating and
HIGH when the converter is disabled or when the converter is abnormally operating.
6. Test Configuration
AUX
IOC
-S
AUX
IOC DC
-S
Figure 12 Table 1
+Vout
A
V
R1
+Vin
+S
TRIM C2 A
Load
-S
-Vout
-Vin
-ON/OFF
+ON/OFF
C1
DC
Recommended External components
C1 220μF/100V
C2 470μF/100V
5. Output Remote Sensing
Thisserieshasthecapabilitytoremotelysensebothlinesofitsoutput.Thisfeaturemovestheeffectiveoutputvoltageregulation
point from the output of the unit to the point of connection of the remote sense pins. This feature automatically adjusts the real
output voltage in order to compensate for voltage drops in distribution and maintain a regulated voltage at the point of load. The
voltage range of this is:
[(+Vout)–(-Vout)]–[(+Sense)–(-Sense)]≤10%oftheVoutnominal.
If the sense feature is not used, the sense pins should be connected locally to the respective Vout pins. Please note that although the
output voltage can be increased by both the remote sense and by the trim, the maximum increase for the output voltage is not the
sum of both. Figure 11
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Product Page 30 Model PCB Foolgnnl A \vcunNcE
CUI Inc SERIES: VFB600 DESCRIPTION: DC-DC CONVERTER date 04/10/2017 page 12 of 12
CUIoffersatwo(2)yearlimitedwarranty.Completewarrantyinformationislistedonourwebsite.
CUIreservestherighttomakechangestotheproductatanytimewithoutnotice.InformationprovidedbyCUIisbelievedtobeaccurateandreliable.However,noresponsibilityis
assumedbyCUIforitsuse,norforanyinfringementsofpatentsorotherrightsofthirdpartieswhichmayresultfromitsuse.
CUIproductsarenotauthorizedorwarrantedforuseascriticalcomponentsinequipmentthatrequiresanextremelyhighlevelofreliability.Acriticalcomponentisanycomponentofa
lifesupportdeviceorsystemwhosefailuretoperformcanbereasonablyexpectedtocausethefailureofthelifesupportdeviceorsystem,ortoaffectitssafetyoreffectiveness.
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20050 SW 112th Ave.
Tualatin, OR 97062
800.275.4899
Fax 503.612.2383
cui.com
techsupport@cui.com
rev. description date
1.0 initial release 06/27/2011
1.02 adjustabilitynoteadded,V-Infinitybrandingremoved 08/07/2012
1.03 updated spec 04/01/2013
1.04 added UL approvals to 24 Vdc and 48 Vdc output models 03/05/2014
1.05 added application note information 04/10/2017
The revision history provided is for informational purposes only and is believed to be accurate.
REVISION HISTORY
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