ISOLATED DC/DC CONVERTERS
48 Vdc Input
Sep. 19, 2011
53 Vdc/8 A Output
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
RoHS Compliant PRELIMINARY Rev.D
Fixed Frequency
OCP/SCP
Over Temperature Protection
Remote On/Off
Output Voltage Trim
Basic Insulation
0RHB-Q2T53x
Isolated
High Efficiency
High Power Density
Low Cost
Input Under Voltage Lockout
Output Over-Voltage Shut Down
Class 2, Category 2, Isolated DC/DC Converter (refer to IPC-9592)
Description
The 0RHB-Q2T53x is isolated DC/DC converters that operate from a nominal 48 Vdc source. These units will
provide up to 424W of output power from a nominal 48 Vdc input. This unit is designed to be highly efficient and
low cost . Features include remote on/off, over current protection and input undervoltage lockout. This converter
is provided in an industry standard half- brick package.
Part Selection
Output
Voltage
53 Vdc
Input Voltage
48 Vdc
Max. Output
Current
8A
Max. Output
Power
424W
Typical
Efficiency
94%
Model Number
Active High
0RHB- Q2T530
Model Number
Active Low
0RHB- Q2T53L
Notes:
1. Add “G” suffix at the end of the model number to indicate Tray Packaging.
2. All part numbers above indicate RoHS 6. Change the second letter "R" to "7" for RoHS 5 part numbers.
Absolute Maximum Ratings
Parameter
Input Voltage (continuous)
Remote On/Off
I/O Isolation Voltage
Ambient Temperature
Storage Temperature
Min
-0.3 V
-0.3 V
-
-40
C
-55
C
Typ
-
-
-
-
-
Max
80 V
18 V
1500 V
85
C
125
C
Notes
Note:
Ratings used beyond the maximum ratings may cause a reliability degradation of the converter or may
permanently damage the device.
Input Specifications
Parameter
Input Voltage
Input Current (full load)
Input Current (no load)
Remote Off Input Current
Input Reflected Ripple Current (rms)
I t Inrush Current Transient
Turn-on Voltage Threshold
2
Turn-off Voltage Threshold
2
2
Min
36 V
-
-
-
-
-
33 V
32 V
Typ
48 V
-
80 mA
20 mA
-
-
-
-
Max
72 V
12.6 A
120 mA
30 mA
200 mA
1A s
35 V
34 V
2
Notes
Tested with simulated source impedance
of 12 uH, 5 Hz to 20 MHz; Use 150 uF/100
V electrolytic capacitor with ESR=1 ohm
max, at 200 kHz@25°C.
Note:
All specifications are typical 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
1
ISOLATED DC/DC CONVERTERS
48 Vdc Input
Sep. 19, 2011
53 Vdc/8 A Output
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Output Specifications
Parameter
Output Voltage Set Point
Line Regulation
Load Regulation
Regulation Over Temperature
(-40deg.C-85deg.C)
Ripple and Noise (pk-pk)
Ripple and Noise (rms)
Output Current Range
Output DC Current Limit
Turn On Time
Overshoot at Turn on
Output Capacitance
Transient Response
50% ~ 75% of Max Load
Settling Time
75% ~ 50% of Max Load
Settling Time
-
-
-
-
-
-
-
-
800 mV
800 uS
800 mV
800 uS
di/dt=0.1 A/us, Vin=48 Vdc,
Ta=25°C, with a 1µF ceramic
capacitor and 300 uF low ESR
aluminum capacitor output.
Min
52.0 V
-
-
-
-
-
0A
9A
-
-
300 uF
-
80 mS
0%
-
Typ
53.0 V
-
-
-
-
-
Max
54.0 V
100 mV
100 mV
600 mV
300 mV
60 mV
8A
12A
150 mS
3%
1000 uF
Notes
V
in
=48 V, Io=50%load
Note:
All specifications are typical at nominal input, full load at 25°C with a 1µF ceramic capacitor and a 300uF
Aluminum cap at output unless otherwise stated.
General Specifications
Parameter
Efficiency
Switching Frequency
Input to Output
Input to Case
Output to Case
Output Voltage Trim Range
Isolation Capacitance
Over Temperature Protection
Over Voltage Protection
FIT
Dimensions
Inches
millimeters
Weight
-
2.28 x 2.40x 0.512
57.91 x 60.96 x 13.00
110 g
-
Min
92.5%
-
-
-
-
42 V
-
-
57 V
Typ
94%
275 kHz
-
-
-
-
-
105
℃
-
258
Max
-
-
1500 V
500 V
1500 V
56 V
15 nF
-
60 V
It’s the temperature of baseplate.
Calculated Per Bell Core SR-332
(Vin=48 V, Vo=53 V, Io=8 A, Ta = 25C,
9
FIT=10 /MTBF)
Notes
Vin=48 V, full load , Ta=25C
Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302
Tel 201-432-0463
Fax 201-432-9542
www.belfuse.com
2
ISOLATED DC/DC CONVERTERS
48 Vdc Input
53 Vdc/8 A Output
Sep. 19, 2011
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Note:
1.When Remote On/Off pin is open, for active low option, unit is off; for active high option, unit is on.
2. The efficiency is measured at Vin=48V, full load and Ta=25°C.
3.Test the temperature of baseplate.
4. All specifications are typical at nominal input, full load at 25°C unless noted.
Control Specifications
Parameter
Remote On/Off
Signal Low (Unit On)
Signal High (Unit Off)
Signal Low (Unit Off)
Signal High (Unit On)
Current Sink
Active High
Active Low
-0.3 V
2.4 V
-0.3 V
2.4 V
0 mA
-
-
-
-
-
0.8 V
18 V
0.8 V
18 V
2 mA
The remote on/off pin open, Unit
off.
The remote on/off pin open, Unit
on.
Min
Typ
Max
Notes
Output Trim Equations
Equations for calculating the trim resistor 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.
Rtrimup
½
(100
delta
)
Vo
(100
2
delta
)
k
1.225
delta
delta
Vout
Module
Trim
GND
Rtrimup
100
Rtrimdown
½
2
k
delta
Vout
Module
Trim
GND
Rtrimdown
delta
½
Vo
_
req
Vo
100
%
Vo
Note:Vo_req=Desired
(trimmed) output voltage[V]
Output voltage Vo=53.000 V
Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302
Tel 201-432-0463
Fax 201-432-9542
www.belfuse.com
3
ISOLATED DC/DC CONVERTERS
48 Vdc Input
Sep. 19, 2011
53 Vdc/8 A Output
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Efficiency Data
95.0%
EFFICIENCY
90.0%
85.0%
80.0%
75.0%
70.0%
2.00
4.00
6.00
8.00
OUTPUT CURRENT(A)
36 V
48 V
72V
Thermal Derating Curve
Vin=48V, with addition heatsink and with maximum junction temperature of semiconductors derated to 120C.
Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302
Tel 201-432-0463
Fax 201-432-9542
www.belfuse.com
4
ISOLATED DC/DC CONVERTERS
48 Vdc Input
Sep. 19, 2011
53 Vdc/8 A Output
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Ripple and Noise Waveforms
36 Vdc input, 53 Vdc/8 A output
48 Vdc input, 53 Vdc/8 A output
72 Vdc input, 53 Vdc/8 A output
Note:
Ripple and noise at full load, with a 1uF ceramic cap and a 300 uF AL cap at output, and Ta=25 deg C.
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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