Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302
Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
ISOLATED DC/DC CONVERTERS
48 Vdc Input
3.3 Vdc /30 A Output
Output Specifications
Parameter
Min
Typ
Max
Notes
Output Voltage Set Point
3.234 V
3.30 V
3.366 V
Vin=48 V, Io=50%load
Load Regulation
-
±4 mV
±9 mV
line Regulation
-
±8 mV
±16.5 mV
Regulation Over Temperature
(-40deg.C-85deg.C)
-
±30 mV
±50 mV
Ripple and Noise (rms)
-
10 mV
20 mV
Ripple and Noise (pk-pk)
-
55 mV
90 mV
0-20MHz BW, with a 1F ceramic capacitor
and the minimum external Tantalum cap at
output.
Output Current Range
0 A
-
30 A
Output DC Current Limit
33 A
-
44 A
Short Circuit Surge Transient
-
2 A
2s
4 A
2s
Turn on Time
-
25 mS
Overshoot at Turn on
-
0%
-
Output Capacitance
470 uF
-
5600 uF
Transient Response
Overshoot
-
50 mV
100 mV
25% ~ 50%
Max Load
Settling Time
-
150 uS
250 uS
Overshoot
-
50 mV
100 mV
50% ~ 25%
Max Load
Settling Time
VO=3.3 V
-
150 uS
250 uS
di/dt=0.1 A/us, Vin=48 Vdc,
with a 1F ceramic capacitor
and the minimum external
Tantalum cap at output.
Note: All specifications are typical at 25
°C unless otherwise stated.
General Specifications
Parameter
Min
Typ
Max
Notes
Efficiency
90%
93%
-
Measured at Vin=48 V, full load.
Switching Frequency
270 kHz
300 kHz
330 kHz
Isolation capacitance
-
2200 pF
-
Output Voltage Trim Range
90%
-
110%
Remote Sense Compensation
-
10%
Vin=48V, full load and short feedback
optocoupler.
Over Temperature Protection
-
125
°C
-
Over Voltage Protection
3.8 V
-
4.5 V
Vin=48 V, full load, in hiccup Mode
MTBF
TBD
Calculated Per Bell Core SR-332
(Io=80%load, Ta = 25
°C)
Dimensions
Inches (L × W × H)
Millimeters (L × W × H)
2.30 x 0.90 x 0.37
58.42 x 22.78 x 9.50
Weight
-
28 g
-
Note: All specifications are typical at 25 °C unless otherwise stated.
Control Specifications
Parameter
Min
Typ
Max
Notes
Remote On/Off
Signal Low (Unit On)
-0.7 V
-
0.8 V
Signal High (Unit Off)
Active Low
2.4 V
-
18 V
When Remote On/Off pin is open,
unit is off.
Signal Low (Unit Off)
-0.7 V
-
0.8 V
Signal High (Unit On)
Active High
2.4 V
-
18 V
When Remote On/Off pin is open,
unit is on.
Current Sink
0 mA
-
1 mA