NDM1-25-120 Datasheet by CUI Inc.

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A V/ V-INFINITY
a division of CUI INC
date
page
MODEL: DESCRIPTION:
10/2010
1 of 19
NON-ISOLATED DIGITAL DC-DC
POL CONVERTER
NDM1-25-120
20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 www.novumdigital.com
FEATURES
•Compact package
(0.5” x 1.075” x 0.579“)
•25 A output
•High efficiency, 92%
•8.5 ~ 14 V input range
•0.6 ~ 2.5 V output range
•Auto-control™ technology
•Through-hole
•PMBus compliant
RoHS
•Voltage/current/temperature
monitoring
•Programmable output voltages
•Voltage margining
•Differential voltage sense
•Synchronize controllers for
phase spreading operations
•Programmable soft start and
soft stop
•Pre-bias startup
•Input under voltage lockout
•Output over voltage protection
•Output over current protection
•Fast over current protection
•Over temperature protection
CONTENTS
Absolute Maximum.....................................................2 Power Fault Management
Electrical Specification.............................................2 ~ 5 Input Undervoltage Lockout (UVLO)..............14
Pin Descriptions..........................................................4 Output Overvoltage Lockout (OVP)................14
Typical Characteristics (0.6V/12A)..............................6 Output Overcurrent Protection (OCP).............14
Typical Characteristics (1.0V/12A)..............................7 Output Lethal Current Protection (LCP).........15
Typical Characteristics (2.5V/12A)..............................8 Over Temperature Protection (OTP)................15
Mechanical Specification............................................9 Configuration Inputs
Operating Information - Power Management Configuration Using Down Resistors.............16
Input Filtering...............................................10 Configuration Input Vset...............................16
Output Capacitance.......................................10 Configuration Inputs ADDR1 and ADDR2.......17
Auto Control™...............................................10 Supported PMBus Commands...................................18
Remote Sensing............................................11 Through-hole Soldering Information.........................18
Output On/Off Control..................................11
Powergood Signal.........................................11
Startup with Pre-Bias.....................................11
Sync Function...............................................12
Output Voltage Trimming..............................12
Startup Delay and Ramp Up Time..................12
Output Voltage Sequencing..........................13
Margining...................................................14
For more information, please visit the product page.
A \v V-INFINITY
a division of CUI INC
date
page
MODEL: DESCRIPTION:
10/2010
2 of 19
NON-ISOLATED DIGITAL DC-DC
POL CONVERTER
NDM1-25-120
20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 www.novumdigital.com
ABSOLUTE MAXIMUM RATINGS
characteristics min nom max units
VIN Input voltage 8 15 V
VOUT Output voltage 0.5 2.8 V
IOUT Output current 30 A
Logic IO Voltage SYNC, PG, FAULT, CTRL, SLART, SDA, SCL -0.3 5.5 V
Ground Voltage GND -0.3 +0.3 V
Analog Pin Voltage ENABLE, VOUT, VSET, CRC, SENSE+, SENSE-, ADDR1, ADDR2 -0.3 5.5 V
Operating ambient TBD
Storage Temp -55 125 °C
OUTPUT
parameter conditions/description min nom max units
voltage adjustment range set using PMBus 0.6 2.5 V
voltage margin range1-20 5 20 %
voltage accuracy 0.6 V Vout < 1.2
1.2 V Vout < 2.5
±3
±2
%
%
voltage ripple 8 25 mVp-p
current range 025A
line regulation VIN = 8.5 ~ 14 V -1 1 %
load regulation VIN = 12 V -1 1 %
SENSE+ input bias current SENSE+ = 4V 864 1,000 1,185 μA
SENSE- input bias current SENSE- = 0.1V 20 25 30 μA
ramp-up time adjustable via PMBUS 0.5 147.5 ms
ON time delay range adjustable via PMBUS 0 1,000 ms
start-up time 50 ms
load transient voltage deviation CO = 500 μF ±80 mV
load transient recovery time VIN = 12 V, CO = 500 μF , VO = 1 V 100 μs
recommended minimum
output capacitor
ceramic 500 μF
INPUT / SUPPLY
parameter conditions/description min nom max units
voltage 8.5 12 14 V
idle current sysgood, no output, VIN = 12 V 50 mA
1.Voltage absolute maximum of 2.8 V
For more information, please visit the product page.
A \v V-INFINITY
a division of CUI INC
date
page
MODEL: DESCRIPTION:
10/2010
3 of 19
NON-ISOLATED DIGITAL DC-DC
POL CONVERTER
NDM1-25-120
20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 www.novumdigital.com
GENERAL / POWER / EFFICIENCY
parameter conditions/description min nom max units
output power 0 62.5 W
efficiency VIN = 12 V, VO = 1 V, 50% of maximum IO
VIN = 12 V, VO = 1 V, maximum IO
VIN = 12 V, VO = 2.5 V, 50% of maximum IO
VIN = 12 V, VO = 2.5 V, maximum IO
86.9
83.3
92.0
89.9
%
%
idle power sysgood, no output, VIN = 12 V 0.6 W
switching frequency 500 kHz
FAULT PROTECTION
parameter conditions/description min nom max units
power good range -10 10 %nom
over voltage threshold (OVP) 3.8 V
over current threshold (OCP) adjustable via PMBUS 30 A
fast current protection (LCP)
threshold
must be 2x OCP 60 A
fast current protection (LCP)
set point accuracy
-20 20 %
fast current protection (LCP)
delay
0.2 0.25 μs
thermal protection threshold
(OTP)
adjustable via PMBUS -40 105 125 °C
thermal protection hysteresis 15 °C
For more information, please visit the product page.
A \v V-INFINITY
a division of CUI INC
date
page
MODEL: DESCRIPTION:
10/2010
4 of 19
NON-ISOLATED DIGITAL DC-DC
POL CONVERTER
NDM1-25-120
20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 www.novumdigital.com
COMMUNICATION CONNECTIONS
symbol pin IO type nominal operating voltage description
ENABLE 1 Analog I 0 ~ 5 V Control signal to enable PWM controller
SENSE+ 2 Analog I 0 ~ 2.8 V Output voltage positive sense input
SENSE- 3 Analog I 0 ~ 0.1 V Output voltage negative sense input
n/c 4 -- -- No connect
ADDR2 5 Analog I Resistor Address setting for serial communication/configuration
ADDR1 6 Analog I Resistor Address setting for serial communication/configuration
VSET 7 Analog I Resistor Output voltage setpoint configuration pin
CRC 8 Analog I -0.1 ~ 0.1 V Return path for external setting resistors (VSET, ADDR1, ADDR2)
SYNC 9 Digital IO (pull-up) 3.3 V Frequency sync. port. Controller can be configured as master or slave.
PG 10 Digital IO (pull-up) 3.3 V Power Good. Indicates output voltage rail is within regulation. Goes low
under any fault condition or recognition of shutdown request. May be
used to cascade (sequence) VR start-up in combination with SYSG pin (on
following VRs).
FAULT 11 Digital IO (pull-up) 3.3 V Fault output. Wired and Internal pull-up. Goes low under any fault
condition (UVLO, OCP, OVP, OTP). When pulled low controller is disabled
and restarts again when released. Used for fault management between
multiple POLs.
CTRL 12 Digital IO 3.3 V Control or Enable pin. No internal pull-up resistor.
SALRT 13 Digital IO 3.3 V Alert line. Communicates fault or pending fault alert to master or host
system power manager.
SDA 14 Digital IO 3.3 V SMBus compatible data serial input/output.
SCL 15 Digital IO 3.3 V SMBus compatible clock serial input.
n/c 16 -- -- No connect
n/c 17 -- -- No connect
n/c 18 -- -- No connect
POWER CONNECTIONS
symbol pin IO type nominal operating voltage description
VIN 19~20 Power 8.5 ~ 14 V Input voltage
GND 21~22 Ground -- Power ground
VOUT 23~24 Power 0.6 ~ 2.5 V Output voltage
LOGIC INPUT/OUTPUT CHARACTERISTICS
parameter conditions/description min nom max units
input high voltage (VIH) CTRL, SCL, SDA, SYNC, PG, FAULT 2 V
input low voltage (VIL) CTRL, SCL, SDA, SYNC, PG, FAULT 0.8 V
output high voltage (VOH) SALRT, SCL, SDA, SYNC, PG, FAULT 2.25 V
output low voltage (VOL) SALRT, SCL, SDA, SYNC, PG, FAULT 0.4 V
For more information, please visit the product page.
A \v V-INFINITY
a division of CUI INC
date
page
MODEL: DESCRIPTION:
10/2010
5 of 19
NON-ISOLATED DIGITAL DC-DC
POL CONVERTER
NDM1-25-120
20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 www.novumdigital.com
PMBUS
parameter conditions/description min nom max units
setup time, SMBus (tset) 300 ns
hold time, SMBus (thold) 250 ns
ANALOG SIGNALS
parameter conditions/description min nom max units
analog IO SENSE+ 0 2.8 V
analog IO SENSE- 0 0.1 V
analog IO ENABLE turn on (10 mA max.)
ENABLE turn off
25
0.3
V
V
POWER MANAGEMENT FEATURES
parameter conditions/description min nom max units
number of addressable devices 1 113 devices
input UVLO turn-on threshold 8.5 V
input UVLO turn-off threshold 8.1 V
PMBUS input voltage
monitoring accuracy
-170 170 mV
PMBUS output voltage
monitoring accuracy
-30 30 mV
PMBUS output current
monitoring accuracy
0.6 V Vout < 2.5 ±12%
PMBUS temperature
monitoring accuracy
±5 °C
For more information, please visit the product page.
$9
a division of CUI INC
date
page
MODEL: DESCRIPTION:
10/2010
6 of 19
NON-ISOLATED DIGITAL DC-DC
POL CONVERTER
NDM1-25-120
20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 www.novumdigital.com
50
55
60
65
70
75
80
85
0 5 10 15 20 25
Efficiency (%)
Output Current (A)
50
55
60
65
14 Vin
12 Vin
10 Vin
8.5 Vin
70
75
80
85
0 5 10 15 20 25
Efficiency (%)
Output Current (A)
160.0
120.0
80.0
40.0
0.0
-40.0
-80.0
200.0
mV
AC
120.0
80.0
40.0
0.0
-40.0
-80.0
-120.0
-160.0
-200.0
mV
DC
-0.609 -0.409 -0.209 -0.009 0.191 0.391 0.591 0.791 0.991 1.191 1.391
ms
0.8
0.6
0.4
0.2
0.0
-0.2
-0.4
-0.6
-0.8
V
DC
16.0
12.0
8.0
4.0
0.0
20.0
V
DC
-79.86 -59.86 -39.86 -19.86 0.142 20.14 40.14 60.14 80.14 100.1 120.1
ms
0.8
0.6
0.4
0.2
0.0
-0.2
-0.4
-0.6
-0.8
V
DC
16.0
12.0
8.0
4.0
0.0
20.0
V
DC
-79.86 -59.86 -39.86 -19.86 0.142 20.14 40.14 60.14 80.14 100.1 120.1
ms
80.0
60.0
40.0
20.0
0.0
-20.0
-40.0
-60.0
-80.0
mV
AC
-7.986 -5.986 -3.986 -1.986 0.014 2.014 4.014 6.014 8.014 10.01 12.01
µs
Efficiency Output Load Transient Response
Start-up Shut-down
Output Ripple and Noise
Top Trace: Output Voltage (200 mV / div)
Bottom Trace: Input Voltage (4 V / div)
Time Scale: (20 ms / div)
Trace: Output Voltage (20 mV / div)
Time Scale: (2 μs / div)
Top Trace: Output Voltage (200 mV / div)
Bottom Trace: Input Voltage (4 V / div)
Time Scale: (20 ms / div)
Top Trace: Load Current
Bottom Trace: Output Voltage (40 mV / div)
Slew Rate: (1A/μs)
Current step-change (6.25-18.75-6.25 A)
Time Scale: (200 μs / div)
0.6V / 25A TYPICAL CHARACTERISTICS
Conditions (applies to all graphs unless stated otherwise): VI = 12 V, IO = 25 A load, Co = 500 μF
0 m/s
0
5
10
15
20
25
30A
0 20406080100°C
Output Current Derating
Vi=12V, modules mounted on a 6” X 4”, 2 oz, 6-Layer test board
For more information, please visit the product page.
A V/ V-INFINITY
a division of CUI INC
date
page
MODEL: DESCRIPTION:
10/2010
7 of 19
NON-ISOLATED DIGITAL DC-DC
POL CONVERTER
NDM1-25-120
20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 www.novumdigital.com
14 Vin
12 Vin
10 Vin
8.5 Vin
50
55
60
65
70
75
80
85
90
0 5 10 15 20 25
Efficiency (%)
Output Current (A)
50
55
60
65
70
75
80
85
90
0 5 10 15 20 25
Efficiency (%)
Output Current (A)
160.0
120.0
80.0
40.0
0.0
-40.0
-80.0
200.0
mV
AC
120.0
80.0
40.0
0.0
-40.0
-80.0
-120.0
-160.0
-200.0
mV
DC
-0.609 -0.409 -0.209 -0.009 0.191 0.391 0.591 0.791 0.991 1.191 1.391
ms
1.6
1.2
0.8
0.4
0.0
-0.4
-0.8
-1.2
-1.6
V
DC
16.0
12.0
8.0
4.0
0.0
20.0
V
DC
-79.86 -59.86 -39.86 -19.86 0.142 20.14 40.14 60.14 80.14 100.1 120.1
ms
1.6
1.2
0.8
0.4
0.0
-0.4
-0.8
-1.2
-1.6
V
DC
16.0
12.0
8.0
4.0
0.0
20.0
V
DC
-79.86 -59.86 -39.86 -19.86 0.142 20.14 40.14 60.14 80.14 100.1 120.1
ms
80.0
60.0
40.0
20.0
0.0
-20.0
-40.0
-60.0
-80.0
mV
AC
-7.986 -5.986 -3.986 -1.986 0.014 2.014 4.014 6.014 8.014 10.01 12.01
µs
Efficiency Output Load Transient Response
Start-up Shut-down
Output Ripple and Noise
Top Trace: Output Voltage (400 mV / div)
Bottom Trace: Input Voltage (4 V / div)
Time Scale: (20 ms / div)
Trace: Output Voltage (20 mV / div)
Time Scale: (2 μs / div)
Top Trace: Output Voltage (400 mV / div)
Bottom Trace: Input Voltage (4 V / div)
Time Scale: (20 ms / div)
Top Trace: Load Current
Bottom Trace: Output Voltage (40 mV / div)
Slew Rate: (1A/μs)
Current step-change (6.25-18.75-6.25 A)
Time Scale: (200 μs / div)
1.0V / 25A TYPICAL CHARACTERISTICS
Conditions (applies to all graphs unless stated otherwise): VI = 12 V, IO = 25 A load, Co = 500 μF
0 m/s
0
5
10
15
20
25
30A
0 20406080100°C
Output Current Derating
Vi=12V, modules mounted on a 6” X 4”, 2 oz, 6-Layer test board
For more information, please visit the product page.
A V/ V-INFINITY
a division of CUI INC
date
page
MODEL: DESCRIPTION:
10/2010
8 of 19
NON-ISOLATED DIGITAL DC-DC
POL CONVERTER
NDM1-25-120
20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 www.novumdigital.com
14 Vin
12 Vin
10 Vin
8.5 Vin
50
55
60
65
70
75
80
85
90
95
0 5 10 15 20 25
Efficiency (%)
Output Current (A)
160.0
120.0
80.0
40.0
0.0
-40.0
-80.0
200.0
mV
AC
120.0
80.0
40.0
0.0
-40.0
-80.0
-120.0
-160.0
-200.0
mV
DC
-0.609 -0.409 -0.209 -0.009 0.191 0.391 0.591 0.791 0.991 1.191 1.391
ms
4.0
3.0
2.0
1.0
0.0
-1.0
-2.0
-3.0
-4.0
V
DC
16.0
12.0
8.0
4.0
0.0
20.0
V
DC
-79.86 -59.86 -39.86 -19.86 0.142 20.14 40.14 60.14 80.14 100.1 120.1
ms
4.0
3.0
2.0
1.0
0.0
-1.0
-2.0
-3.0
-4.0
V
DC
16.0
12.0
8.0
4.0
0.0
20.0
V
DC
-79.86 -59.86 -39.86 -19.86 0.142 20.14 40.14 60.14 80.14 100.1 120.1
ms
80.0
60.0
40.0
20.0
0.0
-20.0
-40.0
-60.0
-80.0
mV
AC
-7.986 -5.986 -3.986 -1.986 0.014 2.014 4.014 6.014 8.014 10.01 12.01
µs
Efficiency Output Load Transient Response
Start-up Shut-down
Output Ripple and Noise
Top Trace: Output Voltage (1 V / div)
Bottom Trace: Input Voltage (4 V / div)
Time Scale: (20 ms / div)
Trace: Output Voltage (20 mV / div)
Time Scale: (2 μs / div)
Top Trace: Output Voltage (1 V / div)
Bottom Trace: Input Voltage (4 V / div)
Time Scale: (20 ms / div)
Top Trace: Load Current
Bottom Trace: Output Voltage (40 mV / div)
Slew Rate: (1A/μs)
Current step-change (6.25-18.75-6.25 A)
Time Scale: (200 μs / div)
2.5V / 25A TYPICAL CHARACTERISTICS
Conditions (applies to all graphs unless stated otherwise): VI = 12 V, IO = 25 A load, Co = 500 μF
0 m/s
0
5
10
15
20
25
30A
0 20406080100°C
Output Current Derating
Vi=12V, modules mounted on a 6” X 4”, 2 oz, 6-Layer test board
For more information, please visit the product page.
A /\ \V V-INFINITY Wyjty ; ‘ 1:33:33 b"'a—'Iy'—b'2'dE§ EEEE‘O‘EO DE‘Q'UU- .. . "E m . .1 0 00°00 ] RECOMMENDED FOOTF’R‘NF row V‘EW
a division of CUI INC
date
page
MODEL: DESCRIPTION:
10/2010
9 of 19
NON-ISOLATED DIGITAL DC-DC
POL CONVERTER
NDM1-25-120
20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 www.novumdigital.com
2.86 0.113 1.27 0.050
(18 PLCS)
1.27 0.050
(17 PLCS)
2.86 0.113
1.52 0.060
(6 PLCS)
2.54 0.100
(4 PLCS)
4.13 0.163
9.91 0.390
10.16 0.400
12.7 0.500
27.31 1.075
4.0 0.157
10.0 0.394
0.067
1.7 14.7 0.579
17118
19 20 21 22 23 24
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VDNGniV
2345678910111213141516
RECOMMENDED FOOTPRINT: TOP VIEW
ETADNOITPIRCSED.VER
0102/22/2GNIWARD WENA
A
±0.1mm UNLESS OTHERWISE
SPECIFIED
TOLERANCE:
Website: www.cui.com
20050 SW 112th Ave.
Tualatin, OR 97062
Phone: 503-612-2300
800-275-4899
Fax: 503-612-2383
RoHS
ZRJ 3:1
NDM1-25
COPYRIGHT 2010 BY CUI INC.
TITLE:
MM [INCHES]
NDM1-25
NDM1-25
PC FILE NAME:
APPROVED BY:
DRAWN BY:
UNITS:PART NO.
SCALE:
REV:
MECHANICAL DRAWING (THROUGH-HOLE)
For more information, please visit the product page.
A \v V-INFINITY rrrrrr \ /
a division of CUI INC
date
page
MODEL: DESCRIPTION:
10/2010
10 of 19
NON-ISOLATED DIGITAL DC-DC
POL CONVERTER
NDM1-25-120
20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 www.novumdigital.com
OPERATING INFORMATION - POWER MANAGEMENT
INPUT FILTERING
The NDM1-25 module has built-in capacitances to
supply the pulsed current due to PWM switching.
However, to help minimize input voltage ripples,
additional input capacitance is recommended as
follows: 1x 330μF POSCAP or electrolytic and 3x 22μF
ceramic capacitors, placed as close as possible to the
input pins. (see Figure 1) If large, long-term load tran-
sients are present, additional bulk capacitances are
recommended, such as a 1000μF low-ESR electrolytic or
OSCON.
OUTPUT CAPACITANCE
The amount of output capacitance required depends on
the output ripple and noise requirements and transient
performance, even though the NDM1-25 POL
module does not require output capacitance for low
noise operations. As good starting point is 5x100μF
ceramic. (see Figure 1) These capacitors should be
placed as close to the load as possible. Additional high
frequency capacitors can be placed next to the load to
improve transient performance at the load.
AUTO-CONTROL™
The NDM1-25 utilizes an Auto-Control™ algorithm
to achieve stability and optimal transient response.
There is no need for any external compensation, as the
algorithm automatically takes into account the input
voltage, output voltage, load current conditions, and
output capacitance. Auto-control™ achieves this by
constantly monitoring the regulated output voltage on
a cycle-by-cycle basis and adjusting the parameters of
the controller to optimize the regulation. As the control
algorithm takes into account all variations in the power
stage, including operating conditions, component
variations and component aging, the control loop can
maintain high gain up to as high a bandwidth as
stability will allow, resulting in highest loop
performance without sacrificing stability. The default
algorithm is configured for balanced ripple and noise
and transient response. The algorithm can be
customized for better ripple and noise or faster
transient response.
Auto-Control™ performance can be observed during
operation in the Demo tab of the V-Infinity Intelligence
Center GUI. As the regulation of a DC-DC converter
varies with load current, transient load step, amount of
bulk capacitance, inductor value etc.; so Auto-Control™
varies also to optimize the regulation.
The user has the ability to set the optimization goal of
the Auto-Control™ algorithm in the V-Infinity
Intelligence Center GUI. This is available on the GUI
Demo tab under “Optimization Factor”. Nine settings
are available, with 1 corresponding to the least
aggressive optimization, ideal for low ripple, and 9
corresponding to the most aggressive optimization,
ideal for fast transient response. The module defaults
to 5, and this is ideal for the majority of applications
where a good balance of noise and transient response
is desired.
Auto-Control™ also offers Quiet Mode and high ESR
Output Cap Optimization Mode options to achieve
different design goals.
Quiet Mode
When Quiet Mode is turned on the module is always
tuned to achieve the best regulation. Auto-Control™
will tune to a low value to give a low loop bandwidth,
minimizing the amplification of wide band noise
resulting in the lowest output deviation.
When Quiet Mode is turned off the module is always
tuned to achieve the best transient response. This
means that during load transients the module will tune
to a high Auto-Control™ value to give the highest loop
bandwidth and lowest sensitivity. When there is no
transient disturbance and the output voltage consists
mainly of wide bandwidth noise the module keeps
Auto-Control™ at a suitable value so that transient
bursts are well regulated. This may increase the ob-
served ripple during steady state load.
NDM1-25
330µF
100µFx5
Figure 1: Recommended Circuit
For more information, please visit the product page.
é\\\ \v V-INFINITY
a division of CUI INC
date
page
MODEL: DESCRIPTION:
10/2010
11 of 19
NON-ISOLATED DIGITAL DC-DC
POL CONVERTER
NDM1-25-120
20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 www.novumdigital.com
High ESR Output Cap Optimization Mode
Auto-Control™ automatically tunes for a wide range of
capacitor values and types including low ESR MLCC,
with High ESR Output Cap Optimization Mode set to
LOW. However, even further improvements are possible
for capacitor types where the ESR zero is significant,
by setting the High ESR Output Cap Optimization Mode
to HIGH. Beware that selecting High ESR Output Cap
Optimization Mode HIGH when only MLC capacitors are
employed may result in low level oscillation. By default
high ESR output cap optimization Mode is set to OFF.
Auto-Control™ Technology Advantages
• Robust reliable control. Impervious to variations in
components and the application context.
• Optimized higher performance control. Significantly
improves transient performance and reduces the
number of decoupling capacitors required in the end
application.
• Enables the use of lower cost (poorer tolerance
components) without risking stability.
REMOTE SENSING
In general, the load distribution circuit should have
minimal impedance due to the large load current, to
help achieve good regulation and low distribution loss.
If needed, remote sensing can be implemented to im-
prove regulation and transient response. Connect the
+Sense and –Sense pins to the +Vout and –Vout points
where regulation is needed, through two separate
differential pair traces.
OUTPUT ON/OFF CONTROL
By default, the device is configured to be always on
without on/off control. The output of NDM1-25 can
be turn on and off through the CTRL pin. Either posi-
tive or negative logic can be configured. With positive
logic, the module will be turned on with a logic high
on the CTRL pin, and turned off with a logic low signal.
Negative logic is just the opposite. The device can also
be configured to be always on without on/off control,
which is the default device setting. The CTRL pin can
also be used to allow for sequencing (see OUTPUT
VOLTAGE SEQUENCING).
POWERGOOD SIGNAL
The NDM1-25 module provides a PG signal to indicate
the status of normal operations. It is an open collector
signal that requires a pull up resistor to a 3.3V line. It
goes high when the output voltage is within regulation,
and automatically adjusts for different output voltages.
It goes low whenever the output voltage is out of regu-
lation is such cases as over-current , over temperature
or input under voltage.
STARTUP WITH PRE-BIAS
The NDM1-25 allows a power-up into a Pre-bias
condition. A Pre-bias condition happens when a voltage
is present on the output of the power converter before
it is enabled.
The converter starts its ramp following the predefined
power-up sequence (delay and ramp). When the refer-
ence voltage reaches the Pre-bias voltage level, the
PWM output is enabled.
Vout
t
vout_ prebias
Startup Delay
_
0
vout
_
regulated
Ramp slope can be set
Figure 3: Pre-bias is less than Vout
t
vout prebias level
Startup_
delay
Ramp Rate can be set
0
vout
Receive startup
command Start Power
Control
NDM1 system initialisation
Enable ramp logic
Vout
Figure 2: Pre-bias is greater than Vout
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MODEL: DESCRIPTION:
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NON-ISOLATED DIGITAL DC-DC
POL CONVERTER
NDM1-25-120
20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 www.novumdigital.com
SYNC FUNCTION
The NDM1-25 module achieved voltage regulation thru
digital pulse width modulation (DPWM). A
synchronization method is provided where multiple
slave devices are controlled by a single master device
via open loop phase alignment of the PWM patterns.
The DPWM synchronization allows the timing of the
pulse width modulation to be aligned between the
master and slave(s) at the same switching frequency
rate. The DPWM synchronization will prevent the de-
vices from drifting from each other with respect to the
start of the pulse width modulation. By default the
slave phase shift is 180° from the master.
Figure 4 illustrates the connectivity of the SYNC signal
for the case where two slave devices are used in a
master/slave configuration. This case shows the exam-
ple where several NDM1-25 modules are used to control
various voltage rails at the same switching frequency.
DPWM synchronization ensures that the starting points
of each slaves PWM patterns are under the control of
the designated master device and that the master and
slave on-chip oscillators are frequency locked to within
a certain error margin.
The slave device will check for slow and fast arriving
SYNC pulses and flag the error condition if enabled.
An error condition will cause an exit from master-slave
synchronization, resulting in the slave returning to
free-running PWM generation which is not aligned to
the master. The slave will again begin the synchroniza-
tion process. After all three stages of the synchroniza-
tion process are completed, the slave PWM will again be
synchronized to the master.
OUTPUT VOLTAGE TRIMMING
As a digital POL module, the NDM1-25 module can be
programmed via PMBus command to different output
voltages without any hardware circuit board
modifications. The output voltage can also be trimmed
at the factory or via the V-Infinity GUI and stored in
non-volatile memory in the NDM1-25 module.
STARTUP DELAY AND RAMP UP TIME
POL startup delay and startup ramp up rate are
adjustable through GUI or PMBus commands. The
startup delay range is 0mS to 1048mS. The default
set up is 0mS. Ramp up rate ranges from 2.6V/mS to
10.13mV/mS. Ramp up is monolithic and default set up
is 1V/mS.
PWM1
PWM2
SYNC(Out)
Master
PWM1
PWM2
SYNC (IN)
Slave
PWM1
PWM2
SYNC (IN)
Slave
Figure 4: Block Diagram of Master-Slave
Synchronization Connection
Startup Delay Vout Ramp slope
Vout can be adjusted real time
with expected ramp rate
0
Vout
t
Slope can be adjusted
Max = 1.048 s,
Min = 0 s
Max = 2.6 v/ms,
Min = 10.13 mv/ms
Figure 5: Adjustable range of startup delay and ramp
up rate.
For more information, please visit the product page.
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MODEL: DESCRIPTION:
10/2010
13 of 19
NON-ISOLATED DIGITAL DC-DC
POL CONVERTER
NDM1-25-120
20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 www.novumdigital.com
OUTPUT VOLTAGE SEQUENCING
The NDM1-25 can be configured to achieve advanced
voltage sequencing between power rails. This capability
eliminates the need for additional power management
circuitry, in a system environment with multiple voltage
domains. Ensuring consistent and predictable
start-up of multiple voltage rails after power-on or
power system reset (due to power outage or fault
condition) prevents catastrophic and unpredictable
current flows through digital processors and other
loads served.
Coordination of voltage rails and predictable shutdown
under fault conditions reduces the risk of unpredictable
system behavior where a problem occurs with one of
the voltage rails in a system application.
Programmable power-on sequencing delays may also
be used to ensure certain voltage rails are stabilized
before energizing mission critical functions.
A recommended configuration for multiple module
systems is shown in figure 6 where the control signal
is used to initiate sequencing during normal operations
and the FAULT signal is used for fault management.
Before the load systems are connected, it is necessary
to program the ON Rise Time, On Time Delay, and OFF
Time Delay for each module. This can be easily ac-
complished using the V-Infinity GUI which is the ideal
tool to program and fine tune these parameters during
development. In the Basic tab of the Configure section
of the GUI the ON Rise Time, On Time Delay, and OFF
Time Delay can all be independently set to meet system
requirements. Either positive or negative logic of the
CONTROL pin can be configured as required. Figure 7
illustrated the timing diagram for normal sequencing.
Upon assertion of the CONTROL pin the ON Time Delay
begins. The output voltage will begin to rise after the
ON Time Delay is over. The output voltage will rise
monotonically until reaching regulation. The amount
of time to reach regulation from the end of the ON
Time Delay is the On Rise Time. When the CONTROL
pin becomes unasserted the OFF Time Delay begins
and the output voltage will remain regulated until this
delay is over. The voltage ramp during turn-off is not
controlled by the module, but by the load current as it
discharges the output capacitance. Once the system
designer is satisfied with the timing sequence, the tim-
ing parameters can be permanently stored in the non-
volatile memory of the module.
For fault management, the FAULT pin of each module
can be tied together so that if there is a fault (Over
Voltage, Over Current, Input Under Voltage, or
Temperature) on any module in the system all units will
shut down immediately and remain off until the fault
condition is removed. The turn-off delays are ignored
in a fault condition and there is no ramp down control.
CTRL = 0V
3.3V
Module 1 Vout
Module 2 Vout
Module 3 Vout
On Time Delay
On Rise Time
Off Time Delay
Figure 7: Timing Diagram
NDM1-25
NDM1-25
NDM1-25
Figure 6: Multiple Module Configuration
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MODEL: DESCRIPTION:
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NON-ISOLATED DIGITAL DC-DC
POL CONVERTER
NDM1-25-120
20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 www.novumdigital.com
MARGINING
During test and development, it is often required to
vary the output voltage around its target set point in
order to determine whether the load can operate over a
specified supply voltage range (Figure 8)
The NDM1-25 provides the ability to set the output volt-
age at a predefined higher or lower value around the
target set point. The Margin limit can be set through
the GUI or PMBus command. The output can be com-
manded to switch between the High value, Nominal or
Low value as a percentage of the nominal value. The
range can be set ±20% of the nominal target output
voltage value.
POWER FAULT MANAGEMENT
NDM1-25 supports the following fault conditions:
Input undervoltage lockout (UVLO).
Output overvoltage protection (OVP).
Output over current protection (OCP).
Over temperature protection (OTP)
INPUT UNDERVOLTAGE LOCKOUT (UVLO)
A UVLO condition inhibits the output while the input
voltage is below the programmed threshold. The output
of the NDM1-25 will not turn on until the input voltage
exceeds the Vin UVLO Turn-On Threshold and will turn
off if the input voltage falls below the Vin UVLO
Turn-Off Threshold. The supported UVLO threshold
range can be programmed via PMBus from 8.5V to 14V.
In the continuous presence of a UVLO fault the
controller will make an infinite number of attempts to
re-start power control with no relaxation time between
attempts, allowing very fast system response once the
UVLO fault condition clears.
OUTPUT OVERVOLTAGE PROTECTION (OVP)
The NDM1-25 offers output overvoltage protection to
protect load circuitry from being subjected to a voltage
higher than its electrical specifications (limits).
The output of the NDM1-25 module will be turned off
and device will enter an OVP fault state when the out-
put voltage exceeds the pre-programmed OVP thresh-
old for a time greater than the pre-programmed hyster-
esis delay.
The module enters a hiccup mode and attempts to
restart every 250ms. A maximum number of 8 OVP
restart attempts every 250ms are made. Thereafter an
infinite number of re-start attempts are made every 1
minute. It will recover automatically when the output
voltage is reduced to less than the OVP limit.
A maximum number of 8 OVP restart attempts every
250ms are made. Thereafter an infinite number of re-
start attempts are made every 1 minute.
OUTPUT OVERCURRENT PROTECTION (OCP)
The device will enter an OCP fault state and the output
of the NDM1-25 module will be turned off if the load
current is 15-20% over the nominal load current. The
module enters a hiccup mode and attempts to restart
every 250ms. It will recover automatically when the
load current is reduced to less than the OCP limit. The
OCP threshold level can be programmed via GUI or
PMBUS
-20%
+20%
Figure 8: Voltage Margining
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MODEL: DESCRIPTION:
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NON-ISOLATED DIGITAL DC-DC
POL CONVERTER
NDM1-25-120
20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 www.novumdigital.com
OUTPUT LETHAL CURRENT PROTECTION
(LCP)
The NDM1-25 offers fast (through analog sense circuits)
output overcurrent protection in the event of overload
conditions or short circuit between the output voltage
nodes (SENSE+) and ground (SENSE-) over and above
standard OCP.
The device will enter an LCP fault state when the
output current rises above a pre-programmed LCP
threshold. The LCP threshold level can only be
programmed through the PMBus. The LCP response
time is on the order of 250 ns and must be 2x the OCP
threshold.
In the case of an LCP fault the device will make an
infinite number of attempts to re-start power control
with a relaxation time of 250 ms between attempts.
OVER TEMPERATURE PROTECTION (OTP)
The NDM1-25 offers thermal protection through its
on-chip temperature sensor. The device will respond to
the OTP fault by forcing the PWM1 signal from the
controller to enter tri-state, immediately disabling
power control. In the continuous presence of an OTP
fault, the device will make an infinite number of
attempts to re-start power control with a relaxation
time of 250 ms between attempts. It recovers automati-
cally when the module temperature is cooled down by
20°C.
CONFIGURATION INPUTS
The NDM1-25 is equipped with a number of
configuration inputs. These inputs can be used to
configure a NDM1-25 if serial communication is not
available. External configuration resistors are connected
to the configuration inputs. If no external configuration
resistors are detected, the NDM1-25 remains at
factory default configuration. Device settings
determined by configuration inputs can be modified
through serial communication during normal operation.
NDM1-25 configuration settings are determined in the
sequence shown in Figure 9.
Configuration resistors are determined during the
NDM1-25 start-up process only. Once a NDM1-25 has
completed its start-up sequence, the configuration
resistors are ignored (until the next start-up).
Device settings determined through configuration
resistors may be overwritten subsequently through
serial communication during normal operation.
The following configuration inputs are available
• ADDR1 and ADDR2
• VSET
NDM1-XX Post-Reset Power Up
Valid input voltage applied
Oscillator and PLL stabilised
Built-In Self Tests (BIST) passed
Calibration parameters retrieved and applied
Factory default configuration settings assumed
Configuration Resistors
Configuration resistor settings determined and applied
NVM Configuration
Configuration previously stored in NVM retrieved and
applied
Configuration Changes (SMBus)
Temporary configuration changes (through serial
communication) remain active until NDM1-XX power removed.
Configuration changes may be made permanent through
storage of settings in NVM (on demand, using serial
communication).
Normal Operation
NDM1-XX ready for power delivery and communication
Figure 9: Device start-up and configuration
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A \v V-INFINITY
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MODEL: DESCRIPTION:
10/2010
16 of 19
NON-ISOLATED DIGITAL DC-DC
POL CONVERTER
NDM1-25-120
20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 www.novumdigital.com
CONFIGURATION USING DOWN RESISTORS
Configuration inputs ADDR1 and ADDR2 are used to
assign an initial SMBus address to a device. In small-
scale systems with up to 16 NDM1-25 devices, only one
of the address inputs is required (ADDR1).
All configuration resistors (with the exception of VSET)
should be selected from the standard E12 (or higher)
series, with 1% tolerance, and 100ppm temperature
coefficient. Configuration resistors should be
connected to the configuration inputs, and grounded to
the CRC pin, as illustrated in Figure 10. For all
functions except VSET, sixteen distinct values of
configuration resistors are detected (including short
[0Ω] to CRC, or floating input). For VSET any value of
resistance ranging from 6.2kΩ..68kΩ (outside any
standard resistance series) may be used to choose the
desired output voltage set-point.
Configuration input readings are filtered internally by
the NDM1-25. In addition to this, noisy environments
may require the connection of a small filter capacitance
(100pF) in parallel with the configuration resistors.
The current injected into the configuration resistors is
small (10μA typ.), resulting in negligible power
dissipation and ground currents.
CONFIGURATION INPUT VSET
Configuration input VSET can be used to configure the
output voltage set-point, as well as initial behavior of
control pin CTRL. Resistor RVSET can be chosen in a
continuous range from 0kΩ..100kΩ but NDM1-25 out-
put voltage restrictions (documented elsewhere) limit
the useful RVSET range to approximately 8.2kΩ..47KΩ.
The resulting output voltage can be determined by the
following equation:
Voutsetpoint =RVSET 1V
18.75KΩ
and is valid for all values of RVSET except for cases
where pin VSET is shorted to CRC (or RVSET<10Ω or
VSET is floating (or RVSET>90kΩ). For both of these
two special cases of RVSET (shorted to CRC, or floating)
the output voltage set-point will remain at the factory
default level of 0.6V. This relationship is shown in
Figure 11.
0.600
0.363
0.437
0.533
0.640
0.800
0.960
1.173
1.440
1.760
2.080
2.507
0.000
0.500
1.000
1.500
2.000
2.500
0 10000 20000 30000 40000 50000
Vout setpoint in V
R_VSET in Ω
Figure 11: R VSET versus Output Voltage
NDM1-25
R
VSET
ADDR1
R
ADDR1
R
ADDR2
CRC
ADDR2
VSET
Figure 10: Configuration inputs
For more information, please visit the product page.
A \v V-INFINITY a 5,3 32 I0 I2 Is m 22 27 33 39 47 56 as 32 mo 0 5,8 3,2 m ‘2 \s m 22
a division of CUI INC
date
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MODEL: DESCRIPTION:
10/2010
17 of 19
NON-ISOLATED DIGITAL DC-DC
POL CONVERTER
NDM1-25-120
20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 www.novumdigital.com
CONFIGURATION INPUTS ADDR1 AND
ADDR2
Configuration inputs ADDR1 and ADDR2 are used to
assign an initial SMBus address to a NDM1-25 slave
device. Unique device addresses are required in
systems where multiple SMBus devices are connected
through serial interface lines SDA (SMBus data) and SCL
(SMBus clock). Bus conflicts will occur if more than one
device responds to the same SMBus address.
If serial communication is not required, or the
factory-default SMBus address of 16 decimal (or 0x10)
is acceptable, both inputs ADDR1 and ADDR2 may be
left floating. In smaller-scale systems with up to sixteen
NDM1-25 slave devices it is sufficient to utilize ADDR1
only (while ADDR2 is shorted to CRC). In this case,
SMBus addresses 16..31 (0x10..0x1F) can be assigned
through RADDR1. In larger-scale systems both RADDR1
and RADDR2 can be used, in which case any SMBus
address in the range 16..127 (0x10..0x7F) can be
assigned to the device.
Note that a number of SMBus addresses in the address
range 0..15 are reserved for special purposes (e.g.
SMBus Alert Response, SMBus Host). SMBus addresses
in the range 0..15 should be avoided, and cannot be
assigned through ADDR1 and ADDR2 configuration
inputs.
If RADDR2 is not used (and ADDR2 is connected to
CRC), the effective SMBus address is
ADDRSMBus = 16 + index(RADDR1) with index(RADDR1) = 0.15
If both RADDR1 and RADDR2 are used, the effective
SMBus address is
ADDRSMBus = 16 (1+index(RADDR2)) + index(RADDR1) with
index (RADDR2) = 0.6
Table 1 offers a summary of assigned SMBus addresses
as a function of RADDR1 and RADDR2.
Table 1: Assigned (decimal) SMBus address as a function of RADDR1 and RADDR2
RADDR2
in kΩ
0
index 0
6.8
index 1
10
index 3
12
index 4
15
index 5
18
index 6
22
index 7
27
index 8
33
index 9
39
index 1 0
56
index 1 2
68
index 1 3
100
index 1 5
RADDR1
in kΩ
16
32
64
80
96
112
16
16
16
16
16
16
16
6.8
index 1
17
33
65
81
97
113
17
17
17
17
17
17
17
8.2
index 2
18
34
66
82
98
114
18
18
18
18
18
18
18
10
index 3
19
35
67
83
99
115
19
19
19
19
19
19
19
12
index 4
20
36
68
84
100
116
20
20
20
20
20
20
20
15
index 5
21
37
69
85
101
117
21
21
21
21
21
21
21
18
index 6
22
38
70
86
102
118
22
22
22
22
22
22
22
22
index 7
23
39
71
87
103
119
23
23
23
23
23
23
23
27
index 8
24
40
72
88
104
120
24
24
24
24
24
24
24
33
index 9
25
41
73
89
105
121
25
25
25
25
25
25
25
39
index 1 0
26
42
74
90
106
122
26
26
26
26
26
26
26
47
index 11
27
43
75
91
107
123
27
27
27
27
27
27
27
56
index 1 2
28
44
76
92
108
124
28
28
28
28
28
28
28
68
index 1 3
29
45
77
93
109
125
29
29
29
29
29
29
29
82
index 1 4
30
46
78
94
110
126
30
30
30
30
30
30
30
100
index 1 5
31
47
79
95
111
127
16
16
16
16
16
16
16
Note: Addresses are represented in hexadecimal in the GUI
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MODEL: DESCRIPTION:
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NON-ISOLATED DIGITAL DC-DC
POL CONVERTER
NDM1-25-120
20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 www.novumdigital.com
THROUGH-HOLE SOLDERING INFORMATION
To ensure module performance and reliability,
adherence to IPC-A-610D standards for solder joint
acceptability is recommended.
The NDM1-25 module is designed for RoHS compliant
plated through hole mounting by wave or manual
soldering. The recommended pot temperature is a
maximum 270ºC with a maximum dwell time of 10
seconds. A maximum preheat temperature of 150ºC
with a preheat rate of 3ºC/s is suggested.
To prevent damage to the module during manual
soldering, special attention should be taken to avoid
direct contact between the hot soldering iron tip and
the pins for longer than 3 seconds.
Table 2: Supported PMBus commands
FUNCTIONALITY COMMAND CODE COMMAND NAME DESCRIPTION
On, Off and Margin Testing 01h OPERATION Turn the unit on and off from the CONTROL pin
On, Off and Margin Testing 02h ON_OFF_CONFIG Configures CONTROL pin & serial bus commands
needed to turn the unit on and off
Fault Management 03h CLEAR_FAULTS Clear any fault bits that have been set
Set Output Voltage 20h VOUT_MODE Use linear output voltage setting
Set Output Voltage 21h VOUT_COMMAND Can use external resistor divider V0>2.5V
Vout Margin 25h VOUT_MARGIN_HIGH Can be done through VOUT_COMMAND
Vout Margin 26h VOUT_MARGIN_LOW Can be done through VOUT_COMMAND
Set Output Voltage 27h VOUT_TRANSITION_RATE Shall be the same as soft-start rate
Input Under Voltage 35h VIN_ON Literal format: Fixed voltage divider for 12 V op
Input Under Voltage 36h VIN_OFF Literal format: Fixed voltage divider for 12 V op
Fault Management 40h VOUT_OV_FAULT_LIMIT Over voltage protection
Fault Management 46h IOUT_OC_FAULT_LIMIT Set current limit
Fault Management 4Fh OT_FAULT_LIMIT Over-temperature fault limit. Had default value
Vout Sequencing 60h TON_DELAY Time from enable to output ramp starting
Vout Sequencing 61h TON_RISE The time from when the output starts to rise until the
voltage entered the regulation band
Vout Sequencing 64h TOFF_DELAY The time from a stop condition is received until stops
transferring energy to the output
Status 78h STATUS_BYTE Returns one byte of information with a summary of
the most critical faults
Status 79h STATUS_WORD Returns two bytes of information with a
summary of the unit’s fault condition
Telemetry 88h READ_VIN Reurns the input voltage in volts
Telemetry 8Bh READ_VOUT The actual, measured output voltage in the same
format as set by the VOUT-MODE
Telemetry 8Ch READ_IOUT The measured output current in amperes
Telemetry 8Dh READ_TEMPERATURE1 temperature readings can be returned for each device
Telemetry 94h READ_DUTY_CYCLE The duty of PMBus device’s main converter in %
SUPPORTED PMBUS COMMANDS
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Warning :
All information, including illustrations, is believed to be accurate and reliable. Users, however, should independently evaluate the suitability of
and test each product selected for their application. CUI Inc makes no warranties as to the accuracy or completeness of the information, and
disclaims any liability regarding its use. Specifications are subject to change without notice.
REVISION HISTORY
rev. description date
A initial release 10/12/2010
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