ISOLATED DC/DC CONVERTERS
48 Vdc Input
3.3 Vdc/50 A, 5.0 Vdc/30 A Output
General Specifications
Parameter
Min
Typ
Max
Notes
Efficiency
Vo=5.0 V
Vo=3.3 V
90%
90%
93.0%
92.5%
-
-
Vin=48V, full load , Ta=25 ° C
Switching Frequency
Isolation capacitance
Output Voltage Trim Range
300 kHz
-
80% Vo
330 kHz
1500 pF
-
360 kHz
-
110% Vo
Over Voltage Protection
Over Temperature Protection
1
Input to Output Isolation Voltage
MTBF
2
-
-
-
120 ° C
130% Vo
-
TBD
-
-
2000 V
Calculated Per Bell Core SR-332 (I O =
Nominal; T a = 25 ° C)
Dimensions
Inches
millimeters
2.28 x 2.4 x 0.42
57.51 x 60.98 x 10.67
Weight
-
76 g
-
Notes : All specifications are typical at 25 ° C unless otherwise stated.
1. OVP is tested under 48 Vin and full load with photo coupler short. The output will be latched off if the
output voltage exceeds over voltage specification. To turn the converter on requires either cycling
the ON/OFF pin or power to the converter.
2. Isolation between input and output is basic isolation, test duration is 60 seconds.
Control Specifications
Parameter
Min
Typ
Max
Notes
Remote On/Off
Signal Low (Unit On)
Signal High (Unit Off)
Signal Low (Unit Off)
Signal High (Unit On)
Active Low
Active High
-0.3 V
2.4 V
-0.3 V
2.4 V
-
-
-
-
0.8 V
18 V
0.8 V
18 V
The remote on/off pin open, Unit
off.
The remote on/off pin open, Unit
on.
Output Trim Equations
Equations for calculating the trim resistor (in k ? ) are shown below. The Trim Down resistor should be connected
between the Trim pin and Ground pin. The Trim Up resistor should be connected between the Trim pin and the
Vout. Only one of the resistors should be used for any given application.
Rtrimdown =
100
delta
? 2 [ k Ω ]
Vout
Rtrimup =
(100 + delta ) ? Vo ? 122. 5
1 . 225 ? delta
? 2 [ k Ω ]
Module
Trim
GND
Rtrimdown
Notes :
delta =
( Vo _ req ? Vo ) × 100 [ % ]
Vo
Module
Vout
Trim
Rtrimup
Vo_req=Desired(trimmed) output voltage[V]
Output voltage Vo=3.304 V for 3.3 V; Vo=5.008 V for 5 V.
GND
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 ? Tel 201-432-0463 ? Fax 201-432-9542 ? www.belfuse.com
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