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Parameter Rating Unit Notes
+In to –In voltage -0.5 to +36 Vdc
+In to –In voltage 50 Vdc <100ms
PC to –In voltage -0.5 to +7.0 Vdc
PR to –In voltage -0.5 to +7.0 Vdc
+Out to –Out voltage -0.5 to +36.9 Vdc
SC to –Out voltage -0.5 to +1.5 Vdc
Isolation voltage (in to out) 2000 Vrms
Isolation voltage (in to base) 1550 Vrms
Isolation voltage (out to base) 500 Vrms
Storage temperature (C–Grade) -40 to +125 °C
Operating temperature (C–Grade) -20 to +100 °C Baseplate
Pin soldering temperature 500 (260) °F (°C) <5 sec;wa ve solder
Pin soldering temperature 750 (390) °F (°C) <7 sec;hand solder
Mounting torque 5 (0.57) in-lbs (N-m) 6 e a c h , # 4-40 or M3
Shown actual size:
2.28 x 1.45 x 0.5 in
57,9 x 36,8 x 12,7 mm
45
Absolute Maximum Ratings
Parameter Min Typ Max Unit
Baseplate to sink; flat, greased surface 0.24 °C/Watt
Baseplate to sink; thermal pad (P/N 20265) 0.21 °C/Watt
Baseplate to ambient 10.9 °C/Watt
Baseplate to ambient; 1000 LFM 2.8 °C/Watt
Thermal capacity 48 Watt-sec/°C
Thermal Resistance and Capacity
24Vin / 28Vout / 100Watts
DC-DC Converter Module
Model Number V24C28C100B*
Features
•DC input range: 18 - 36V
•Input surge withstand: 50V for 100ms
•DC output: 28V
•Programmable output: 10 to 110%
•Regulation: ±0.2% no load to full load
•Efficiency: 89%
•Maximum operating temperature:
100°C at full load
•Power density: 60W/cubic inch
•Height above board: 0.43 in. (10,9 mm)
•Parallelable, with N+M fault tolerance
•Low noise ZCS/ZVS architecture
Typical Applications: telecommunications,
process control and distributed power
systems
Product Overview
This DC-DC converter module uses
2nd Generation power processing, control
and packaging technologies to provide the
performance, flexibility and cost effectiveness
expected of a mature power component.
For example, a plated-cavity core transformer
couples widely separated primary and
secondary windings, resulting in low in-to-
out parasitic capacitance and noise.
High frequency ZCS/ZVS switching,
advanced power semiconductor packaging
and thermal management provide high
power density with low temperature
gradients. Extensive use of silicon
integration results in 1/3 the part count
of a 1st Generation converter.
*Part Numbering
For pin styles see page 6. Slotted baseplate
(style 1) requires no designator. For
threaded baseplate add a “2” to the end of
the part number. For thru-hole, add a “3”.
See page 7 for dimensions.
See part numbering chart on this
page for other product grades.
V24C15C100 B
Input V oltage
24=24Vin
48=48Vin
300=300Vin
375=375Vin
A = Maxi
B = Mini
C = Micro
Output
Voltage
Product Grade Temperatures (°C)
Grade Storage Operating
C =
-
40 to +125
-
20 to +100
T =
-
40 to +125
-
40 to +100
H =
-
55 to +125
-
40 to +100
M =
-
65 to +125
-
55 to +100
Pin
Style
Base-
plate
Output
Power
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Parameter Min Typ Max Unit Notes
Operating input voltage 18 24 36 Vdc
Input surge withstand 50 Vdc <100ms
Output voltage setpoint 27.72 28 28.28 Vdc Nominal input; full load; 25°C
Output OVP setpoint 31.5 32.7 33.9 Vdc 25°C; recycle input voltage to restart ( 1 minute off )
Output power 100 Watts At 100°C baseplate temperature
Efficiency 88 89 % Nominal input; 75% of full load;25°C
Parameter Min Typ Max Unit Notes
Line regulation ±0.02 ±0.2 % Low line to high line; full load
Load regulation ±0.06 ±0.2 % No load to full load; nominal input
Temperature regulation ±0.002 ±0.005 % / °C Over operating temperature range
Ripple and noise, p-p 85 107 mV Nominal input; full load; 20 MHz bandwidth
Current limit 3.64 4.12 5 Amps Output voltage 95% of nominal
Short circuit current .5 4.12 5 Amps Output voltage <250mV
Power sharing accur acy ±2 ±5 % 10 to 100% of full load
Programming range 10 110 % Of nominal output voltage.F or trimming below 90%
of nominal, a minimum load of 10% of maximum
rated power may be required.
Parameter Min Typ Max Unit Notes
Undervoltage turn-on 17.5 17.9 Vdc
Undervoltage turn-off 14.74 15.3 Vdc
Overvoltage turn-off/on 36.3 37.8 39.6 Vdc
Dissipation, standby 3.3 5 Watts No load
MODULE OPERATING SPECIFICATIONS
MODULE INPUT SPECIFICATIONS
MODULE OUTPUT SPECIFICATIONS
ELECTRICAL CHARACTERISTICS
Electrical characteristics apply over the full operating range of input voltage, output load (resistive) and baseplate temperature,
unless otherwise specified. All temperatures refer to the operating temperature at the center of the baseplate.
Baseplate Slotted (Style 1) Slotted baseplate (style 1) requires no designator.
For threaded baseplate add a "2" to the end of the
part number. For thru-hole add a "3".
Pin style Short (Style 1) For long pin configuration add “L”to the end of the
part number. See page 7 for pin dimensions.
MODULE MECHANICAL SPECIFICATIONS
Note: For important information relative to applications where the converter modules are subject to continuous dynamic loading,
contact Vicor applications engineering at 800-927-9474.
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Parameter Min Typ Max Unit Notes
PRIMARY SIDE (PC = Primary Control; PR = Parallel)
PC bias voltage 5.50 5.75 6.10 Vdc PC current = 1.0 mA
current limit 1.5 2.1 3.0 mA PC voltage = 5.5V
PC module disable 2.3 2.3 2.6 Vdc Must be able to sink ≥4 mA. See Fig. 1
PC module enable delay 4 7 ms
PC module alarm 0.5 Vavg UV, OV, OT, module fault. See Figs.2 and 4
PR emitter amplitude 5.7 5.9 6.1 Volts PR load >30 ohms, < 30 pF
PR emitter current 150 mA
PR receiver impedance 375 500 625 ohms 25°C
PR receiver threshold 2.4 2.5 2.6 Volts Minimum pulse width:20ns
PR drive capability 12 modules Without PR buffer amplifier
SECONDARY SIDE (SC = Secondary Control)
SC bandgap voltage 1.21 1.23 1.25 Vdc Referenced to –Out
SC resistance 990 1000 1010 ohms
SC capacitance 0.033 µF
SC module alarm 0 Vdc With open trim; ref erenced to –Out.See Fig.6
Parameter Min Typ Max Unit Notes
Isolation voltage (in to out) 2000 Vrms Complies with reinforced insulation requirements
Isolation voltage (in to base) 1550 Vrms Complies with basic insulation requirements
Isolation voltage (out to base) 500 Vrms Complies with operational insulation requirements
Isolation resistance (in to out) 10 megohms
Weight 2.1 (60) 2.3 (66) ounces (grams)
Temperature limiting 100 115 °C See Figs.2 and 4
Agency approvals cULus, TÜV, CE UL60950, EN60950, CSA60950, IEC 60950.
With a fuse in series with the +Input
MODULE CONTROL SPECIFICATIONS
MODULE GENERAL SPECIFICATIONS
ELECTRICAL CHARACTERISTICS, continued
Note: The cover is electrically conductive and may be electrically connected to the baseplate.
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CONTROL FUNCTIONS - PC PIN
Module Enable/Disable
The module may be disabled by pulling PC below 2.3V with
respect to the –Input. This may be done with an open collector
transistor, relay, or optocoupler. Multiple converters may be
disabled with a single transistor or relay either directly or via
“OR’ing” diodes. See Figure 1.
Module Alarm
The module contains “watchdog” circuitry which monitors
input voltage, operating temperature and internal operating
parameters. In the event that any of these parameters are
outside of their allowable operating range, the module will shut
down and PC will go low. PC will periodically go high and the
module will check to see if the fault (as an example,
overtemperature) has cleared. If the fault has not been cleared,
PC will go low again and the cycle will restart. The SC pin will
go low in the event of a fault and return to its normal state after
the fault has been cleared. See Figures 2 and 4.
Disable
Disable = PC <2.3V
+In
PC
PR
–In
Figure 1—Module enable/disable.
Figure 3—LED on-state indicator.
4kΩ
"Module
Enabled"
+In
PC
PR
–In
Optocoupler +In
PC
PR
–In
4kΩ
Alarm
1.00V
+Out
SC
–Out
Input Undervoltage
Input Overvoltage
Over Temperature
Module Faults
2-20ms typ.
f(VIN)
Auto
Restart
5.7Vdc
(0-3mA)
50Ω
SW2 SW3
1.23
Vdc
6K
1K
SW1
SW1, 2, & 3 shown
in "Fault" position
+Out
SC
–Out
+In
PC
PR
–In
Figure 2—PC/SC module alarm logic.
Figure 5—Isolated on-state indicator.
2-20ms typ.
Fault
SC
PC
1.23V
5.7V 40µs typ.
Figure 4—PC/SC module alarm timing.
Figure 6—Secondary side on-state indicator.
Primary Auxiliary Supply
At 5.7V, PC can source up to 1.5mA. In the example shown in
Figure 3, PC powers a “green” module enabled LED.
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Output Voltage Programming
The output voltage of the converter can be adjusted or
programmed via fixed resistors, potentiometers or voltage
DACs. See Figures 7 and 8.
CONTROL FUNCTIONS - SC PIN
Figure 8—Output voltage trim up circuit.Figure 7—Output voltage trim down circuit.
RD (ohms) = 1,000 V out
Vnom - Vout
RU
Trim Up
Load
Error
Amp
1kΩ
1.23V
0.033µF
+Out
SC
–Out
Load
RD
Trim Down
Error
Amp
1kΩ
1.23V
0.033µF
+Out
SC
–Out
Trim Down
1. This converter is not a constant power device – it has a
constant current limit. Hence, available output power is
reduced by the same percentage that output voltage is
trimmed down. Do not exceed maximum rated output current.
2. The trim down resistor must be connected to the –Out pin.
Trim Up
1. The converter is rated for a maximum delivered power. To ensure
that maximum rated power is not exceeded, reduce maximum
output current by the same percentage increase in output voltage.
2. The trim up resistor must be connected to the +Out pin.
3. Do not trim the converter above maximum trim range
(typically +10%) or the output over voltage
protection circuitry may be activated.
RU (ohms) = 1,000 (Vout-1.23) Vnom –1,000
1.23 (Vout-Vnom)
Trim resistor values calculated automatically:
On-line calculators for trim resistor values are available
on the vicor website at: vicorpower.com/tools.html.
Resistor values can be calculated for fixed trim up, fixed
trim down and for variable trim up or down cases for both
1st and 2nd Generation DC-DC converters.
In addition to trimming information, the web site and the
Applications Manual also include design tips, applications
circuits, EMC suggestions, thermal design guidelines and
PDF data sheets for all available Vicor products.
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CONTROL FUNCTIONS - PR PIN
Parallel Operation
The PR pin supports paralleling for increased power with N+1
(N+M) redundancy and phased array capability. Modules of
the same input voltage, output voltage, and power level will
current share if all PR pins are suitably interfaced.
Compatible interface architectures include the following:
DC coupled single-wire interface. All PR pins are directly
connected to one another. This interface supports current
sharing but is not fault tolerant. Minus In pins must be tied to
the same electric potential. See Figure 9.
AC coupled single-wire interface. All PR pins are connected
to a single communication bus through 0.001µF (500V)
capacitors. This interface supports current sharing and is fault
tolerant except for the communication bus. See Figure 10.
Figure 9—DC coupled single-wire interface.
Module 2
(up to 12)
Module 1
Ground plane
+Out
SC
–Out
+In
PC
PR
–In
+Out
SC
–Out
+In
PC
PR
–In
Module 2
(up to 12)
Module 1
Ground plane
+Out
SC
–Out
+In
PC
PR
–In
+Out
SC
–Out
+In
PC
PR
–In
Figure 10—AC coupled single-wire interface.
0.001µF
0.001µF
R1
4
2
7
6Load
LM10
+Out
SC
–Out
R2
R3
1
3
8
0.001 µF
1.05KΩ
200Ω
R4
1.2KΩ
+Out
SC
–Out
+Out
SC
–Out
+Out
SC
–Out
L
O
A
D
Plane
Ground
Plane
•The +Out and –Out
power b uses should be
designed to minimize
and balance parasitic
impedance from each
module output to the
load.
•At the discretion of the
power system designer,
a subset of all modules
within an array may be
configured as slaves by
shorting SC to –Out.
•Do not use output
OR’ing diodes with
MicroMods.
• This module is designed for point of load regulation, where remote sensing
is not required.Activ e v oltage drop compensator, as shown here, may be
used in applications with significant distribution losses.Details of this circuit
are av ailab le in the design guide .
Figure 12—Voltage drop compensation.Figure 11—N+1 module array output connections.
PIN STYLES *
Designator Description Notes
(None) Short solder Requires in-board, mounting
LLong solder On-board mounting for 0.065" boards
SShort ModuMate SurfMate or in-board socket mounting
NLong ModuMate On-board socket mounting
*Pin style designator follows the “A” after the output power and precedes the baseplate designator.
Ex. V375A24C600AN — Long ModuMate Pins
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MECHANICAL DRAWINGS
23
6
1
7
4
5
PLATED
THRU HOLE
DIA
±0,08
*DENOTES T OL = ±0.003
0.133
3,38
1.734**
44,04
.400*
10,16
1.140**
28,96
0.170*
4,32
0.800*
20,32
0.525*
13,34
0.275*
6,99
2.000*
50,80
0.06
1,5
R (4X)
INBOARD
SOLDER
MOUNT
PIN STYLE 1&S
0.094 ±0.003
2,39 ±0,08
0.43
10,9
(7X)
**PCB WINDOW
PCB THICKNESS 0.062 ±0.010
1,57 ±0,25
0.53
13,5
ONBOARD
SOLDER
MOUNT
PIN STYLE 2&N
0.094 ±0.003
2,39 ±0,08
Unless otherwise specified,
dimensions are in inches
mm
Decimals Tol. Angles
0.XX ±0.01
±0.25 ±1°
0.XXX ±0.005
±0.127
PCB MOUNTING SPECIFICATIONS
PINS STYLES
STYLE 1 & 2: TIN/LEAD
HOT SOLDER DIPPED
STYLE S & N: GOLD PLATED COPPER
ALUMINUM
BASEPLATE
ALL MARKINGS
THIS SURFACE
567
4321
(REF)
0.080
2,03 DIA. (7X)
0.21
5,2
0.27
6,9 (2X)
1.04
26,4
1.45
36,8
0.275
6,99
0.800
20,32
0.525
13,34
0.400
10,16
0.12*
3,1 0.20**
5,08
FULL R (6X)
0.10
2,5
CHAMFER
(REF.)
(6X)
0.65
16,5
0.49
12,4
1.30
33,0
2.28
57,9
1.45
36,8
0.13
3,3
0.06
1,5
R (3X)
0.01
X 45˚
Use a
4-40 Screw (6x)
Torque to:
5 in-lbs
0.57 N-m
0.54
13,7
0.43
10,9
Pin Style 2&N
(Long Pin)
0.62
15,7
Pin Style 1&S
(Short Pin)
(7X)
(7X)
Slotted (Style 1)
or
Threaded (Style 2)
4-40 UNC-2B (6X)
or
Thru Hole (Style 3)
#30 Drill Thru (6X)
(0.1285)
(ALL MARKINGS THIS SURFACE)
ALUMINUM
BASEPLATE
12,7 ±0,5
0.50 ±0.02
* Style 1 baseplate only
** Style 2 & 3 baseplates
*** Reserved for Vicor accessories
Not for mounting
style 2 & 3
baseplates only
(4X)***
0.490 ±.015
12,45 ±0,38 (REF)
2.000
50,80
0.235±.015
5,97±0,38
(REF)
0.350±.015
8,89±0,38
(REF)
1.27
32,3 0.09
2,3
MODULE OUTLINE
Converter Pins
No. Function Label
1+In +
2Primary PC
Control
3Parallel PR
4–In –
5–Out –
6Secondary SC
Control
7+Out +
PINS:TIN/LEAD
HOT SOLDER DIP
Vicor Corp. Tel: 800-735-6200, 978-470-2900 Fax: 978-475-6715 V24C28C100B DC-DC Converter Rev. 2 10/03
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Vicor’s comprehensive line of power solutions includes modular, high
density DC-DC converters and accessory components, configurable power
supplies, and custom power systems.
Information furnished by Vicor is believed to be accurate and reliable. However, no responsibility is
assumed by Vicor for its use. No license is granted by implication or otherwise under any patent or patent
rights of Vicor. Vicor components are not designed to be used in applications, such as life support systems,
wherein a failure or malfunction could result in injury or death. All sales are subject to Vicor’s Terms and
Conditions of Sale, which are available upon request.
Specifications are subject to change without notice.
Vicor Corporation
25 Frontage Road
Andover, MA, USA 01810
Tel: 800-735-6200
Fax: 978-475-6715
Email
Vicor Express: vicorexp@vicr.com
Technical Support: apps@vicr.com
Component Solutions
for Your Power System
45
