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300Vin / 28Vout / 250Watts
DC-DC Converter Module
Model Number V300B28C250A*
DC input range: 180 - 375V
Input surge withstand: 400V for 100ms
DC output: 28V
Programmable output: 10 to 110%
Regulation: ±0.3%
Efficiency: 88%
Maximum operating temperature:
100°C at full load
Power density: 100W/cubic inch
Height above board: 0.43 in. (10,9 mm)
Parallelable, with N+M fault tolerance
Low noise ZCS/ZVS architecture
Shown actual size:
2.28 x 2.2 x 0.5 in
57,9 x 55,9 x 12,7 mm
Typical Applications:
off-line systems,
distributed power and electric vehicles
Product Overview
This DC-DC converter module uses
Absolute Maximum Ratings
2nd Generation power processing, control
and packaging technologies to provide the
performance, flexibility and cost effectiveness
Parameter
Rating
expected of a mature power component.
+In to –In voltage
-0.5 to +375.0
For example, a plated-cavity core transformer
+In to –In voltage
400
couples widely separated primary and
PC to –In voltage
-0.5 to +7.0
secondary windings, resulting in low in-to-
out parasitic capacitance and noise.
PR to –In voltage
-0.5 to +7.0
High frequency ZCS/ZVS switching,
+Out to –Out voltage
-0.5 to +36.9
advanced power semiconductor packaging
+Sense to –Out voltage
-0.5 to +36.9
and thermal management provide high
–Sense to –Out voltage
1.0
power density with low temperature
SC to –Out voltage
-0.5 to +1.5
gradients. Extensive use of silicon
integration results in 1/3 the part count
Isolation voltage (in to out)
3000
of a 1st Generation converter.
Isolation voltage (in to base)
1550
Unit
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
Vrms
Vrms
Vrms
°C
°C
°F (°C)
°F (°C)
in-lbs (N-m)
Notes
<100ms
* Part Numbering
Isolation voltage (out to base)
Storage temperature (C–Grade)
Operating temperature (C–Grade)
Pin
Style
Base-
plate
500
-40 to +125
-20 to +100
500 (260)
750 (390)
5 (0.57)
V 300 B 15 C 250 A
Input Voltage
24 = 24Vin
48 = 48Vin
300 = 300Vin
375 = 375Vin
A = Maxi
B = Mini
C = Micro
Output
Voltage
Output
Power
See part numbering chart on this
page for other product grades.
Baseplate
<5 sec; wave solder
<7 sec; hand solder
6 each, # 4-40 or M3
Pin soldering temperature
Pin soldering temperature
Mounting torque
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
Thermal Resistance and Capacity
Parameter
Baseplate to sink; flat, greased surface
Baseplate to sink; thermal pad (P/N 20264)
Baseplate to ambient
Baseplate to ambient; 1000 LFM
Thermal capacity
Min
Typ
0.16
0.14
8.0
1.9
83
Max
Unit
°C/Watt
°C/Watt
°C/Watt
°C/Watt
Watt-sec/°C
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.
Vicor Corp.
Tel: 800-735-6200, 978-470-2900 Fax: 978-475-6715
V300B28C250A DC-DC Converter
Rev. 5.2
Page 1 of 8
Set your site on VICOR at www.vicorpower.com
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.
MODULE OPERATING SPECIFICATIONS
Parameter
Operating input voltage
Input surge withstand
Output voltage setpoint
Output OVP setpoint
Output power
Efficiency
87
88
27.72
31.5
28.00
32.7
Min
180
Typ
300
Max
375
400
28.28
33.9
250
Unit
Vdc
Vdc
Vdc
Vdc
Watts
%
<100ms
Nominal input; full load; 25°C
25°C; recycle input voltage to restart ( 1 minute off )
At 100°C baseplate temperature
Nominal input; 75% of full load; 25°C
Notes
MODULE INPUT SPECIFICATIONS
Parameter
Undervoltage turn-on
Undervoltage turn-off
Overvoltage turn-off/on
Dissipation, standby
5.6
8.4
147.4
Min
Typ
174.6
152.8
Max
178.2
Unit
Vdc
Vdc
Vdc
Watts
Not included
No load
Notes
MODULE OUTPUT SPECIFICATIONS
Parameter
Line regulation
Load regulation
Temperature regulation
Ripple and noise, p-p
Current limit
Short circuit current
Power sharing accuracy
Programming range
10
9.1
6.25
Min
Typ
±0.02
±0.06
±0.002
110
10.3
10.30
±2
Max
±0.20
±0.30
±0.005
138
11.7
11.70
±5
110
Unit
%
%
% / °C
mV
Amps
Amps
%
%
Notes
Low line to high line; full load
No load to full load; nominal input
Over operating temperature range
Nominal input; full load; 20 MHz bandwidth
Output voltage 95% of nominal
Output voltage <250mV
10 to 100% of full load
Of nominal output voltage. For trimming below 90%
of nominal, a minimum load of 10% of maximum
rated power may be required.
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.
MODULE MECHANICAL SPECIFICATIONS
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".
For long pin configuration add “L” to the end of the
part number.
See page 7 for pin dimensions.
Baseplate
Slotted (Style 1)
Pin style
Short (Style 1)
Vicor Corp.
Tel: 800-735-6200, 978-470-2900 Fax: 978-475-6715
V300B28C250A DC-DC Converter
Rev. 5.2
Page 2 of 8
Set your site on VICOR at www.vicorpower.com
ELECTRICAL CHARACTERISTICS, continued
MODULE CONTROL SPECIFICATIONS
Parameter
Min
Typ
Max
Unit
Notes
PRIMARY SIDE
(PC = Primary Control; PR = Parallel)
PC bias voltage
current limit
PC module disable
PC module enable delay
PC module alarm
PR emitter amplitude
PR emitter current
PR receiver impedance
PR receiver threshold
PR drive capability
SECONDARY SIDE
(SC = Secondary Control)
SC bandgap voltage
SC resistance
SC capacitance
SC module alarm
1.21
990
1.23
1000
0.033
0
1.25
1010
Vdc
ohms
µF
Vdc
With open trim; referenced to –Sense. See Fig. 6
Referenced to –Sense
5.7
150
375
2.4
500
2.5
625
2.6
12
5.9
5.50
1.5
2.3
5.75
2.1
2.6
4
6.10
3.0
2.9
7
0.5
6.1
Vdc
mA
Vdc
ms
Vavg
Volts
mA
ohms
Volts
modules
25°C
Minimum pulse width: 20ns
Without PR buffer amplifier
UV, OV, OT, module fault. See Figs. 2 and 4
PR load >30 ohms, < 30 pF
PC current = 1.0 mA
PC voltage = 5.5V
Must be able to sink
≥4
mA. See Fig. 1
MODULE GENERAL SPECIFICATIONS
Parameter
Remote sense (total drop)
Isolation voltage (in to out)
Isolation voltage (in to base)
Isolation voltage (out to base)
Isolation resistance (in to out)
Weight
Temperature limiting
Agency approvals
100
3000
1550
500
10
3.7 (104)
115
4 (112)
Min
Typ
Max
0.5
Unit
Vdc
Vrms
Vrms
Vrms
megohms
ounces (grams)
°C
See Figs. 2 and 4
UL1950, CSA950, EN60950, VDE0805, BS7002,
IEC 60950. With a fuse in series with the +Input
Notes
0.25V per leg (senses must be closed)
Complies with reinforced insulation requirements
Complies with basic insulation requirements
Complies with operational insulation requirements
UL, CSA, TÜV, BABT, CE, VDE
Vicor Corp.
Tel: 800-735-6200, 978-470-2900 Fax: 978-475-6715
V300B28C250A DC-DC Converter
Rev. 5.2
Page 3 of 8
Set your site on VICOR at www.vicorpower.com
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.
Primary Auxiliary Supply
At 5.7V, PC can source up to 1.5mA. In the example shown in
Figure 3, PC powers a module enabled LED.
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.
+In
PC
+Out
+S
SC
–S
–Out
+In
SW1
Auto
Restart
2-20ms typ.
f (VIN)
Input Undervoltage
Input Overvoltage
Overtemperature
Module Faults
50Ω
SW2
SW3
1K
+Out
+S
SC
–S
PC
SW1, 2, & 3
shown in
"Fault" position
Disable
PR
–In
PR
–In
5.7Vdc
(0-3mA)
1.23
Vdc
6K
–Out
Disable = PC <2.3V
Figure 1—Module
enable/disable.
Figure 2—PC/SC
module alarm logic.
+In
PC
+Out
+S
SC
–S
–Out
Fault
PC
5.7V
40µs typ.
"Module
Enabled"
4kΩ
PR
–In
SC
1.23V
2-20ms typ.
Figure 3—LED
on-state indicator.
Figure 4—PC/SC
module alarm timing.
Optocoupler
+In
PC
4kW
+Out
+S
SC
–S
–Out
+In
PC
PR
–In
+Out
+S
SC
–S
–Out
1.00V
Alarm
PR
–In
Figure 5—Isolated
on-state indicator.
Vicor Corp.
Tel: 800-735-6200, 978-470-2900 Fax: 978-475-6715
Figure 6—Secondary
side on-state indicator.
V300B28C250A DC-DC Converter
Rev. 5.2
Page 4 of 8
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CONTROL FUNCTIONS - SC PIN
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.
+Out
+S
Error
Amp
1kΩ
0.033
µF
1.23V
+Out
+S
SC
–S
–Out
R
D
Trim Down
Load
Error
Amp
1kΩ
0.033
µF
1.23V
SC
–S
–Out
R
U
Trim Up
Load
R
D
(ohms) =
1,000 Vout
Vnom - Vout
R
U
(ohms) =
1,000
(Vout-1.23)
Vnom
1.23
(Vout-Vnom)
–1,000
Figure 7—Output
voltage trim down circuit.
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 –Sense pin.
Figure 8—Output
voltage trim up circuit.
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 +Sense pin.
3. Do not trim the converter above maximum trim range
(typically +10%) or the output over voltage
protection circuitry may be activated.
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.
Vicor Corp.
Tel: 800-735-6200, 978-470-2900 Fax: 978-475-6715
V300B28C250A DC-DC Converter
Rev. 5.2
Page 5 of 8
Set your site on VICOR at www.vicorpower.com
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