BEL 0RHB

ISOLATED DC/DC CONVERTERS
48 Vdc Input
53 Vdc/8 A Output
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Sep. 19, 2011
0RHB-Q2T53x
RoHS Compliant PRELIMINARY Rev.D

Isolated

Fixed Frequency

High Efficiency

OCP/SCP

High Power Density

Over Temperature Protection

Low Cost

Remote On/Off

Input Under Voltage Lockout

Output Voltage Trim

Output Over-Voltage Shut Down

Basic Insulation

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)
Min
-0.3 V
Typ
-
Remote On/Off
-0.3 V
-
18 V
-
-
1500 V
Ambient Temperature
-40 C
-
85 C
Storage Temperature
-55 C
-
125 C
I/O Isolation Voltage
Max
80 V
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)
Min
36 V
-
Typ
48 V
80 mA
Max
72 V
12.6 A
120 mA
Remote Off Input Current
-
20 mA
30 mA
Input Reflected Ripple Current (rms)
-
-
200 mA
-
-
1A s
33 V
32 V
-
35 V
34 V
2
I t Inrush Current Transient
2
Turn-on Voltage Threshold
2
Turn-off Voltage Threshold
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 [email protected]°C.
2
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
53 Vdc/8 A Output
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Sep. 19, 2011
Output Specifications
Parameter
Output Voltage Set Point
Min
52.0 V
Typ
53.0 V
Max
54.0 V
Line Regulation
-
-
100 mV
Load Regulation
Regulation Over Temperature
(-40deg.C-85deg.C)
Ripple and Noise (pk-pk)
-
-
100 mV
-
-
600 mV
-
-
300 mV
Ripple and Noise (rms)
-
-
60 mV
Output Current Range
0A
Output DC Current Limit
9A
-
12A
Turn On Time
-
80 mS
150 mS
Overshoot at Turn on
-
0%
3%
300 uF
-
1000 uF
50% ~ 75% of Max Load
-
-
800 mV
Settling Time
-
-
800 uS
75% ~ 50% of Max Load
-
-
800 mV
Settling Time
-
-
800 uS
Output Capacitance
Notes
Vin=48 V, Io=50%load
8A
Transient Response
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.
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
Min
Typ
Max
92.5%
94%
-
Switching Frequency
-
275 kHz
-
Input to Output
Input to Case
Output to Case
-
-
1500 V
500 V
1500 V
Output Voltage Trim Range
42 V
-
56 V
Isolation Capacitance
Over Temperature Protection
Over Voltage Protection
57 V
105 ℃
-
15 nF
60 V
Efficiency
FIT
Notes
Vin=48 V, full load , Ta=25C
It’s the temperature of baseplate.
Calculated Per Bell Core SR-332
(Vin=48 V, Vo=53 V, Io=8 A, Ta = 25C,
9
FIT=10 /MTBF)
258
Dimensions
Inches
millimeters
Weight
2.28 x 2.40x 0.512
57.91 x 60.96 x 13.00
-
110 g
-
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
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Sep. 19, 2011
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
Min
Typ
Max
Notes
-0.3 V
-
0.8 V
2.4 V
-
18 V
The remote on/off pin open, Unit
off.
-0.3 V
-
0.8 V
Signal High (Unit On)
2.4 V
-
18 V
Current Sink
0 mA
-
2 mA
Remote On/Off
Signal Low (Unit On)
Active Low
Signal High (Unit Off)
Signal Low (Unit Off)
Active High
The remote on/off pin open, Unit
on.
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.
(100  delta )  Vo (100  2  delta)
Rtrimup 

k
1.225  delta
delta
Vout
Module
Trim
Rtrimup
GND
Rtrimdown 
delta 
100
 2 k  
delta
Vo _ req  Vo   100 % 
Vout
Module
Trim
GND
Rtrimdown
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
53 Vdc/8 A Output
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Sep. 19, 2011
Efficiency Data
EFFICIENCY
95.0%
90.0%
36 V
85.0%
48 V
80.0%
72V
75.0%
70.0%
2.00
4.00
6.00
8.00
OUTPUT CURRENT(A)
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
53 Vdc/8 A Output
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Sep. 19, 2011
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
5
ISOLATED DC/DC CONVERTERS
48 Vdc Input
53 Vdc/8 A Output
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Sep. 19, 2011
Transient Response Waveforms
Vout=53V, 50% to 75% Load Transients
Vout=53 V, 75% to 50% Load Transients
Note: Transient response at di/dt=0.1 A/uS, with external 300uF AL Cap and 1uF Ceramic Cap.
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302  Tel 201-432-0463  Fax 201-432-9542  www.belfuse.com
6
ISOLATED DC/DC CONVERTERS
48 Vdc Input
53 Vdc/8 A Output
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Sep. 19, 2011
Mechanical Outline
Pin Connections
pin function
1
2
3
4
Vin(+)
Enable
Case
Vin(-)
pin size
0.040"
0.040"
0.040"
0.040"
pin function
5
6
7
8
9
Vo(-)
NC
Trim
NC
Vo(+)
pin size
0.080"
0.040"
0.040"
0.040"
0.080"
Note: Pin 6 and 8 are reserved for differential remote sense (+/- sense). No connection is needed to the pins if
this feature is not needed. They are connected internal to the units respective output nodes thru low impedance
resistors.
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302  Tel 201-432-0463  Fax 201-432-9542  www.belfuse.com
7
ISOLATED DC/DC CONVERTERS
48 Vdc Input
53 Vdc/8 A Output
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Sep. 19, 2011
Revision History
Date
Revision
Changes Detail
2011-07-22
PA
2011-07-28
PB
2011-08-29
PC
Updated maximum height to 13mm and change in mechanical
drawing in the bottom of figure.
YF Sun
2011-09-19
PD
Updata the Ripple and Noise, Input current (no load), Mechanical
Outline, Output Trim Equations and Vout setpoint
YF Sun
Approval
First release
YF Sun
Change Pin6 and Pin8 to NC.
YF Sun
Change the ambient temperature.
RoHS Compliance
Complies with the European Directive 2002/95/EC, calling for the elimination of lead and
other hazardous substances from electronic products.
2011 Bel Fuse Inc. Specifications subject to change without notice.091911
8
CORPORATE
FAR EAST
EUROPE
Bel Fuse Inc.
206 Van Vorst Street
Jersey City, NJ 07302
Tel 201-432-0463
Fax 201-432-9542
www.belfuse.com
Bel Fuse Ltd.
8F/ 8 Luk Hop Street
San Po Kong
Kowloon, Hong Kong
Tel 852-2328-5515
Fax 852-2352-3706
www.belfuse.com
Bel Fuse Europe Ltd.
Preston Technology Management Centre
Marsh Lane, Suite G7, Preston
Lancashire, PR1 8UD, U.K.
Tel 44-1772-556601
Fax 44-1772-888366
www.belfuse.com