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48Vin / 28Vout / 150Watts
DC-DC Converter Module
Model Number V48C28C150A*
DC input range: 36 - 75V
Input surge withstand: 100V for 100ms
DC output: 28V
Programmable output: 10 to 110%
Regulation: ±0.2% no load to full load
Efficiency: 87.5%
Maximum operating temperature:
100°C at full load
Power density: 91W/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
and distributed power systems
Shown actual size:
2.28 x 1.45 x 0.5 in
57,9 x 36,8 x 12,7 mm
Product Overview
This DC-DC converter module uses
second 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 first generation converter.
Absolute Maximum Ratings
Parameter
+In to –In voltage
+In to –In voltage
PC to –In voltage
PR to –In voltage
+Out to –Out voltage
SC to –Out voltage
Isolation voltage (in to out)
Isolation voltage (in to base)
Isolation voltage (out to base)
Storage temperature (C-Grade)
Operating temperature (C-Grade)
Pin soldering temperature
Pin soldering temperature
Mounting torque
Rating
-0.5 to +75
100
-0.5 to +7.0
-0.5 to +7.0
-0.5 to +41.0
-0.5 to +1.5
3000
1550
500
-40 to +125
-20 to +100
500 (260)
750 (390)
5 (.57)
Unit
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
Vrms
Vrms
Vrms
°C
°C
°F (°C)
°F (°C)
in-lbs (N-m)
See part numbering chart on this
page for other product grades.
Notes
<100ms
* Part Numbering
Baseplate
<5 sec; wave solder
<7 sec; hand solder
6 each, # 4-40 or M3
V 4 8 C 12 C 1 5 0 A
Input
Voltage
A = Maxi
B = Mini
C = Micro
Output
Voltage
Output
Power
Product Grade Temperatures (°C)
Grade
Storage
Operating
C
=
-
40 to +125
-
20 to +100
-
40 to +100
T
=
-
40 to +125
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 20265)
Baseplate to ambient
Baseplate to ambient; 1000 LFM
Thermal capacity
Min
Typ
0.24
0.21
10.9
2.8
48
Max
Unit
°C/Watt
°C/Watt
°C/Watt
°C/Watt
Watt-sec/°C
For long pin configuration add “L” to the
end of the part number. 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 Corporation
Tel: 800-735-6200 Fax: 978-475-6715
Data Sheet: V48C28C150A DC-DC Converter Date: 11-00 Rev. 2
Page 1 of 8
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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
86.5
87.5
27.72
31.5
28.00
32.7
Min
36
Typ
48
Max
75
100
28.28
33.9
150
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 temp
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
29.4
75.7
Min
Typ
34.9
30.5
78.8
3.0
82.5
4.5
Max
35.7
Unit
Vdc
Vdc
Vdc
Watts
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
5.46
3.75
Min
Typ
±0.02
±0.06
±0.002
110
6.16
6.16
±2
Max
±0.20
±0.30
±0.005
138
6.97
6.97
±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 Corporation
Tel: 800-735-6200 Fax: 978-475-6715
Data Sheet: V48C28C150A DC-DC Converter Date: 11-00 Rev. 2
Page 2 of 8
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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 –Out. See Fig. 6
Referenced to –Out
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
6.00
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, 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
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
Min
3000
1550
500
Typ
Max
Unit
Vrms
Vrms
Vrms
Notes
Complies with reinforced insulation requirements
Complies with basic insulation requirements
Complies with operational insulation requirements
10
2.1 (60)
100
115
2.3(66)
Megohms
Ounces (grams)
°C
See Figs. 2, 4
UL1950, CSA950, EN60950, VDE0805, BS7002,
IEC 60950. With a fuse in series with the +Input
UL, CSA, TÜV, BABT, CE, VDE
Vicor Corporation
Tel: 800-735-6200 Fax: 978-475-6715
Data Sheet: V48C28C150A DC-DC Converter Date: 11-00 Rev. 2
Page 3 of 8
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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.
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.
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, 4.
+In
PC
+In
Auto
Restart
Input Undervoltage
Input Overvoltage
Over Temperature
Module Faults
+Out
PC
PR
SW1
50Ω
2-20ms typ.
f(V
IN
)
SW2
5.7Vdc
(0-3mA)
SW3
1K
SC
Disable
PR
–In
6K
1.23
Vdc
–In
SW1, 2, & 3 shown
in "Fault" position
–Out
Disable = PC <2.3V
Figure 1—Module
enable/disable.
Figure 2—PC/SC
module alarm logic.
+In
PC
"Module
Enabled"
4kΩ
Fault
PC
5.7V
40µs typ.
PR
–In
SC
1.23V
2-20ms typ.
Figure 3—LED
on-state indicator.
Figure 4—PC/SC
module alarm timing.
Optocoupler
+In
PC
+Out
SC
4kΩ
PR
–In
Alarm
1.00V
–Out
Figure 5—Isolated
on-state indicator.
Vicor Corporation
Tel: 800-735-6200 Fax: 978-475-6715
Figure 6—Secondary
side on-state indicator.
Data Sheet: V48C28C150A DC-DC Converter Date: 11-00 Rev. 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 & 8.
+Out
+Out
R
U
Trim Up
Error
Amp
1kΩ
0.033µF
SC
R
D
Trim Down
Load
Error
Amp
1kΩ
0.033µF
SC
Load
–Out
1.23V
1.23V
–Out
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 –Out 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 +Out pin.
3. Do not trim the converter above maximum trim range
(typically +10%) or the output over voltage
protection circuitry may be activated.
Trim values calculated automatically:
Resistor trim calculators are available on Vicor’s
web site at URL: www.vicr.com/tools.html
or by requesting a copy of Vicor’s
Applications Manual on a CD ROM.
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 on
CD ROM also include design tips,
applications circuits, EMC suggestions,
thermal design guidelines and PDF data
sheets for all available Vicor products.
Vicor Corporation
Tel: 800-735-6200 Fax: 978-475-6715
Data Sheet: V48C28C150A DC-DC Converter Date: 11-00 Rev. 2
Page 5 of 8
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