PRELIMINARY
45
Features
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Data Sheet
24V Input Maxi Family
*
DC-DC Converter Module
DC input range: 18 - 36V
Input surge withstand: 50V for 100ms
DC output: 2V - 48V
Programmable output: 10 to 110%
Regulation: ±0.2% no load to full load
Efficiency: Up to 89%
Maximum operating temperature:
100°C at full load
Power density: Up to 80W/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
Shown actual size:
4.6 x 2.2 x 0.5 in
117 x 56 x 12,7 mm
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 +36
For example, a plated-cavity core transformer
+In to –In voltage
50
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,
SC to –Out voltage
-0.5 to +1.5
advanced power semiconductor packaging
–Sense to –Out voltage
1.0
and thermal management provide high
Isolation voltage (in to out)
3000
power density with low temperature
gradients. Extensive use of silicon
Isolation voltage (in to base)
1550
integration results in 1/3 the part count
Isolation voltage (out to base)
500
of a 1st Generation converter.
Storage temperature (C-Grade)
Pin soldering temperature
Pin soldering temperature
Pin
Style
Base-
plate
Unit
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
Vrms
Vrms
Vrms
°C
°C
°F (°C)
°F (°C)
in-lbs (N-m)
Notes
<100ms
-40 to +125
500 (260)
750 (390)
5 (0.57)
See part numbering chart on this
page for other product grades.
Part Numbering
Operating temperature (C-Grade)
-20 to +100
Baseplate
<5 sec; wave solder
<7 sec; hand solder
6 each, # 4-40 or M3
V 24 A 12 C 500 A
Input Voltage
24 = 24Vin
48 = 48Vin
300 = 300Vin
375 = 375Vin
A = Maxi
B = Mini
C = Micro
Output
Voltage
Output
Power
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 20263)
Baseplate to ambient
Baseplate to ambient; 1000 LFM
Thermal capacity
Min
Typ
0.08
0.07
4.9
1.1
165
Max
Unit
°C/Watt
°C/Watt
°C/Watt
°C/Watt
Watt-sec/°C
For pin styles see page 6. For threaded
baseplate add a “2” to the end of the part
number. For thru-hole, add a “3”.
See page
7 for dimensions.
* The modules described here are the highest power for each output voltage.
Consult factory for availability of lower power units.
Vicor Corp.
Tel: 800-735-6200, 978-470-2900 Fax: 978-475-6715
24V Maxi Family
Rev. 2.3
Page 1 of 8
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PRELIMINARY
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
Min
18
Typ
24
Max
36
50
±1%
Unit
Vdc
Vdc
Vout nom
<100ms
Nominal input; full load; 25°C
Notes
MODULE OUTPUT VOLTAGE RELATED SPECIFICATIONS
Parameter
Efficiency (typ.)
Ripple and noise, p-p (typ.)
Output power (max.)
1.8V
1
TBD
TBD
TBD
2V
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
2.5V
2
3.3V
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
78.0
75
264
4.3
8.0
0.06
115
115
5V
83.0
65
400
6.25
6.8
0.06
115
115
12V
85.5
70
400
14.3
6.8
0.06
115
115
15V
86.5
60
400
17.8
6.3
0.06
115
115
24V
87.5
56
400
28.1
9.3
0.06
115
115
28V
88.5
70
400
32.7
6.3
0.06
115
115
48V
TBD
TBD
TBD
TBD
TBD
Unit
%
mV
Watts
Volts
Watts
Notes
Nominal input; 80% load; 25°C
Nominal input; full load;
25°C; 20MHz BW
At 100°C baseplate temperature
25°C; recycle input voltage to
restart ( 1 minute off )
No load; nominal input
No load to full load; nominal input
Output voltage 95% of nominal
Output voltage <250mV
Output OVP setpoint (nom.) TBD
Dissipation, standby (typ.)
Load regulation (max.)
Current limit (typ.)
Short circuit current (typ.)
TBD
TBD
TBD
TBD
TBD ±% Vout
TBD
TBD
% Iout
% Iout
MODULE INPUT SPECIFICATIONS
Parameter
Undervoltage turn-on
Undervoltage turn-off
Overvoltage turn-off/on
14.8
36.3
Min
Typ
17.5
15.3
37.8
39.6
Max
17.9
Unit
Vdc
Vdc
Vdc
Notes
MODULE OUTPUT SPECIFICATIONS
Parameter
Line regulation
Temperature regulation
Power sharing accuracy
Programming range
10
Min
Typ
±0.02
±0.002
±2
Max
±0.2
±0.005
±5
110
Unit
%
% / °C
%
%
Notes
Low line to high line; full load
Over operating temperature range
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.
1
2
Nominal 2V output trimmed to 1.8V by adding external 9,000 ohm resistor from the SC pin to -S pin. (See Fig. 7)
Nominal 3.3V output trimmed to 2.5V by adding external 3,125 ohm resistor from the SC pin to -S pin. (See Fig. 7)
24V Maxi Family
Rev. 2.3
Page 2 of 8
Vicor Corp.
Tel: 800-735-6200, 978-470-2900 Fax: 978-475-6715
Set your site on VICOR at www.vicorpower.com
PRELIMINARY
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
6.00
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 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
7.3 (210)
115
8 (227)
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
Note:
Specifications are subject to change without notice.
The latest data sheets for individual models are available on the Vicor website at vicorpower.com.
Vicor Corp.
Tel: 800-735-6200, 978-470-2900 Fax: 978-475-6715
24V Maxi Family
Rev. 2.3
Page 3 of 8
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PRELIMINARY
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
+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
Fault
PC
40µs typ.
5.7V
PC
"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
4kΩ
PR
–In
+Out
+S
SC
–S
–Out
1.00V
Alarm
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.
24V Maxi Family
Rev. 2.3
Page 4 of 8
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PRELIMINARY
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
0.033µF
SC
–S
–Out
1.23V
1.23V
+Out
+S
R
U
Trim Up
R
D
Trim Down
Load
Error
Amp
1kΩ
0.033µF
SC
–S
–Out
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
24V Maxi Family
Rev. 2.3
Page 5 of 8
Set your site on VICOR at www.vicorpower.com
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