ISOLATED DC/DC CONVERTERS
36 Vdc - 75 Vdc Input,
Apr. 29, 2011
12 Vdc/5 A Output
Bel Power Inc., a subsidiary of Bel Fuse Inc.
RoHS Compliant
SRSB-50T12C
Features
Isolated
High Efficiency
PRELIMINARY
Rev.A
Output Over Voltage Shutdown
Over Temperature Protection
SCP/OCP
Basic Insulation
Remote On/Off
Fixed Frequency (600 kHz)
High Power Density
Input Under Voltage Lockout
Low Cost
Class 2, Category 2, Isolated DC/DC Converter (refer to IPC-9592)
UL60950-1 Recognized (UL/cUL) (Pending)
Applications
Networking
Computers and peripherals
Telecommunications
Description
The SRSB-50T12C is an isolated dc/dc converter that operates from a nominal 48 Vdc source. The unit will
provide up to 60 W of output power from a nominal 48 Vdc input. The unit is designed to be highly efficient and
low cost. Features include remote on/off, over current protection and under-voltage lockout. The converter is
provided in an industry standard sixteenth brick package.
Part Selection
Output Voltage
12 Vdc
Input Voltage
36 Vdc - 75 Vdc
Max. Output
Current
5A
Max. Output
Power
60 W
Typical
Efficiency
89%
Model Number
Active Low
SRSB-50T12C
Notes:
Add “G” suffix at the end of the model number to indicate Tray Packaging.
Part Number Explanation
S R SB – 50 T 12 C
1 2
3
4
5 6
7
1---Surface Mount
2---RoHS 6, change “R” to “7” means RoHS 5
3---Series name, 1/16 brick
4---Series code
5---Input range (36-75V)
6---Output voltage (12V)
7---Option, “x” of the model part number to be 0-9, A-Z, which will represent the special request of
customer.
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
36 Vdc - 75 Vdc Input,
Apr. 29, 2011
12 Vdc/5 A Output
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Absolute Maximum Ratings
Parameter
Continuous Input Voltage
Input Transient Voltage
Remote On/Off
I/O Isolation Voltage
Ambient Temperature
Storage Temperature
Min
-0.3
-0.3
-0.3
-
-40
-55
Typ
-
-
-
-
-
-
Max
80
100
18
1500
85
125
Unit
V
V
V
V
C
C
100mS maximum
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
Operating Input Voltage
Input Current (full load)
Input Current (no load)
Remote Off Input Current
Input Reflected Ripple Current
(rms)
Input Reflected Ripple Current
(pk-pk)
I t Inrush Current Transient
Turn-on Voltage Threshold
Turn-off Voltage Threshold
2
Min
36
-
-
-
-
-
-
31
30
Typ
48
-
70
1
3
20
0.01
32
31
Max
75
2.4
120
3
7
50
0.02
35
34
Unit
V
A
mA
mA
mA
mA
As
V
V
2
Notes
With simulated source impedance of
15uH, 5Hz to 20MHz; use a
100uF/100V electrolytic capacitor with
ESR=1 ohm max, at 200KHz@25°C.
Note:
All specifications are typical at 25
C
unless otherwise stated.
Output Specifications
Parameter
Output Voltage Set Point
Load Regulation
Line Regulation
Regulation Over Temperature
(-40deg.C-85deg.C)
Total Regulation
Output Ripple and Noise (pk-pk)
Output Ripple and Noise (rms)
Output Current Range
Output DC Current Limit
Min
11.75
-
-
-
-
-
-
0
5.2
Typ
12.00
±9
±10
±20
±39
90
30
-
6.5
Max
12.25
±18
±25
±35
±78
180
55
5
8.5
Unit
V
mV
mV
mV
mV
mV
mV
A
A
0-20MHz BW, with a 1µF ceramic
capacitor and the minimum
external Tantalum cap at output.
Notes
V
in
=48 V, Io=50%Load
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
36 Vdc - 75 Vdc Input,
Apr. 29, 2011
12 Vdc/5 A Output
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Output Specifications (continued)
Parameter
Short Circuit Surge Transient
Turn on Time
Overshoot at Turn on
Output Capacitance
Transient Response
△
V
Overshoot
25%~50%
of Max Load Settling Time
△
V
Overshoot
50%~25%
of Max Load Settling Time
Min
-
-
-
22
Typ
0.5
35
0
-
Max
1
70
5
470
Unit
As
mS
%
uF
2
Notes
-
Vo=
12 V
-
-
-
400
150
400
150
650
300
650
300
mV
uS
mV
uS
di/dt=0.1A/us, Vin=48Vdc, Ta=25°C,
with a 1µF ceramic capacitor and
the minimum external Tantalum cap
at output.
Note:
All specifications are typical at nominal input, full load at 25°C unless otherwise stated.
General Specifications
Parameter
Efficiency
Switching Frequency
Min
86
-
Typ
89
600
Max
-
-
Unit
%
kHz
℃
The OTP threshold is set at 125°C
in non-latch mode, and the module
will restart automatically when
temperature falls down to 115°C.
This voltage is achieved by trimming
up output slowly.
Notes
V
in
=48 V, full load.
Over Temperature Protection
-
125
-
Over Voltage Protection (Static)
Weight
Dimensions
Inches (L
×
W
×
H)
Millimeters (L
×
W
×
H)
Isolation characteristics
Input to Output
Isolation Resistance
Isolation Capacitance
-
-
130
TBD
160
-
%
g
-
1.300 x 0.900 x 0.364
33.02 x 22.86 x 9.24
-
10M
-
-
-
3900
1500
-
-
V
Ohm
pF
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
3
ISOLATED DC/DC CONVERTERS
36 Vdc - 75 Vdc Input,
Apr. 29, 2011
12 Vdc/5 A Output
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Efficiency Data
90%
85%
80%
EFFICIENCY
75%
70%
65%
60%
55%
50%
0.5A
1.25A
2.5A
3.75A
5A
OUTPUT CURRENT (A)
36V
48V
75V
Thermal Derating Curve
Maximum junction temperature of semiconductors derated to 120 degree C.
Derating curve under 48V input range
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
36 Vdc - 75 Vdc Input,
Apr. 29, 2011
12 Vdc/5 A Output
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Transient Response Waveforms
50%-25% Load Transients at Vin=48 V
25%-50% Load Transients at Vin=48 V
Note:
Transient response at Vout=12V, di/dt=0.1A/us, External 22uF Tantalum Cap and 1uF Ceramic Cap, and
Ta=25 deg C.
Ripple and Noise Waveform
48 Vdc input, 12 Vdc/5 A output
Note:
Ripple and noise at full load, and with a 1uF ceramic cap and a 22 uF Tantalum cap at output, 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
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