ISOLATED DC/DC CONVERTERS
48 Vdc Input 28 Vdc /25 A Output
Input Specifications
Parameter
Min
Typ
Max
Notes
Input Voltage
36 V
48 V
76 V
Input Current (no load)
Input Current (full load)
Remote Off Input Current
-
-
-
100 mA
-
150 mA
23 A
40 mA
60 mA
Input Reflected Ripple Current
(pk-pk)
With simulated source impedance of
15 uH, 5 Hz to 20 MHz; use 2* 220
uF/100 V electrolytic capacitor with
ESR = 1 ohm max at 200 kHz
-
-
30 mA
10 mA
-
Input Reflected Ripple Current
(rms)
-
I2t Inrush Current Transient
-
-
1 A2s
Turn-on Voltage Threshold
33 V
34.5 V
35.5 V
Turn-off Voltage Threshold
Input Over Voltage Lockout
31 V
76 V
33 V
78 V
34 V
80 V
Note: All specifications are typical at nominal input, full load at 25 °C unless otherwise stated
Output Specifications
Parameter
Min
Typ
Max
Notes
Vin=48 V, full load
Output Voltage Set Point
27.72 V
28.00 V
28.28 V
Load Regulation
Line Regulation
-
-
-
-
56 mV
56 mV
Regulation Over Temperature
(-40deg.C-85deg.C)
-
-
300 mV
Output Current Range
0 A
-
-
25 A
32.2 V
35 A
Output Voltage Trim Range
Output DC Current Limit
16.8 V
26.25 A
30 A
Ripple and Noise (rms)
Ripple and Noise (pk-pk)
-
-
-
-
80 mV
Over all load, line and temperature
conditions.
280 mV
Turn on Time
20 mS
-
40 mS
80 mS
2%
Overshoot at Turn on
0%
-
Output Capacitance
0 uF
5000 uF
Transient Response
di/dt=0.1A/us, Vin=48 Vdc,
with a 1 µF ceramic
capacitor and a 470 uF low
ESR aluminum load
capacitor at output, Ta=25
°C.
Overshoot
-
-
-
-
800 mV
1200 mV
800 uS
50% ~ 75%
Max Load
Settling Time
500 uS
800 mV
500 uS
VO=28 V
Overshoot
1200 mV
800 uS
75% ~ 50%
Max Load
Settling Time
Note: All specifications are typical at nominal input, full load at 25 °C unless otherwise stated.
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com
