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Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302
Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
NON-ISOLATED DC/DC CONVERTERS
10 V-14 V Input
1.2 V-5.0 V/10 A Output
Non-Isolated
Under-voltage
Lockout
(UVLO)
High
Efficiency
Over
Temperature
Protection
High
Power
Density
OCP/SCP
Excellent Thermal Performance
Remote
On/Off
Low
Cost
Industrial
Temperature
Range
Remote
Sense
Description
The Bel SRBC-10Axx0 modules are a series of non-isolated dc/dc converters that deliver up to 10 A of output
current with full load efficiency of 93% at 3.3 V output. The open-frame construction and small footprint enable
designers to develop cost and space-efficient solutions. Standard features include remote On/Off, over current
protection, short current protection, and wide input.
Part Selection
Output
Voltage
Input Voltage
Max. Output
Current
Max. Output
Power
Typical
Efficiency
Model Number
Active High
5.0 V
10 V 14 V
10 A
50.0 W
95%
SRBC-10A500
3.3 V
10 V 14 V
10 A
33.0 W
93%
SRBC-10A330
2.5 V
10 V 14 V
10 A
25.0 W
92%
SRBC-10A250
1.8 V
10 V 14 V
10 A
18.0 W
90%
SRBC-10A180
1.5 V
10 V 14 V
10 A
15.0 W
89%
SRBC-10A150
1.2 V
10 V 14 V
10 A
12.0 W
87.5%
SRBC-10A120
Note
: Add "G" suffix at the end of the model number to indicate "Tray Packaging".
Absolute Maximum Ratings
Parameter
Min
Typ
Max
Notes
Input Voltage (continuous)
-0.3 V
-
15 V
Output Enable Terminal Voltage
-0.3 V
-
15 V
Ambient Temperature
-40
C
-
85
C
Storage Temperature
-55
C
-
125
C
Note
: All specifications are typical at 25
C unless otherwise stated.
SRBC-10Axx0 Series RoHS Compliant
Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302
Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
NON-ISOLATED DC/DC CONVERTERS
10 V-14 V Input
1.2 V-5.0 V/10 A Output
Input Specifications
Parameter
Min
Typ
Max
Notes
Input Voltage
10 V
-
14 V
Input Current (full load)
-
-
5.7 A
An input line fuse must always be used.
Input Current (no load)
-
-
60 mA
Remote Off Input Current
-
3 mA
10 mA
Input Reflected Ripple Current (pk-pk)
-
100 mA
-
Input Reflected Ripple Current (rms)
-
50 mA
-
Tested with one 1000 uF/25 V Electrolytic
capacitor and four 47 uF tan capacitors
and one 1 uH inductor at the input.
I
2
t Inrush Current Transient
-
0.05 A
2
s
0.1 A
2
s
Turn-on Voltage Threshold
1.2 V - 3.3 V
5.0 V
-
-
7.8 V
9.4 V
-
-
Turn-off Voltage Threshold
1.2 V - 3.3 V
5.0 V
6.7 V
8.0 V
-
-
7.9 V
9.0 V
Note
: All specifications are typical at 25
C unless otherwise stated.
Output Specifications
Parameter
Min
Typ
Max
Notes
Output Voltage Set Point
-2% Vo,set
-
2% Vo,set
Vin=12 V, full load
Load Regulation
-
10 mV
-
Line Regulation
-
10 mV
-
Regulation Over Temperature
(-40
C to +85 C)
-
15 mV
-
Tref=Ta, min to Ta, max
Output Current
0 A
-
10 A
Current Limit Threshold
- 200%
Io -
Short Circuit Surge Transient
-
0.5 A
2
s 1
A
2
s
Ripple and Noise (pk-pk)
-
50 mV
100 mV
Ripple and Noise (rms)
-
20 mV
40 mV
Tested with 0-20 MHz
Turn on Time
-
7 mS
10 mS
Overshoot at Turn on
-
-
1% Vo,set
Output Capacitance
-
-
5000 uF
Transient Response
50% ~ 100% Max Load
-
200 mV
-
Settling Time
-
25 uS
-
100% ~ 50% Max Load
-
200 mV
-
Settling Time
V
O
= 1.2 V -5.0 V
- 25
uS
-
di/dt=2.5 A/uS, Vin=12 V
Note
: All specifications are typical at nominal input, full load 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
NON-ISOLATED DC/DC CONVERTERS
10 V-14 V Input
1.2 V-5.0 V/10 A Output
General Specifications
Parameter
Min
Typ
Max
Notes
Efficiency
Vo=5.0 V
Vo=3.3 V
Vo=2.5 V
Vo=1.8 V
Vo=1.5 V
Vo=1.2 V
-
-
-
-
-
-
95%
93%
92%
90%
89%
87.5%
-
-
-
-
-
-
Measured at Vin=12 V, full load
Switching Frequency
265 kHz
300 kHz
335 kHz
Over Temperature Shutdown
1
-
130
C
-
Output Voltage Trim Range
1.5 V~5.0 V
1.2 V
90% Vo
-
-
-
110% Vo
110% Vo
MTBF
4,982,651 hours
Calculated Per Bell Core SR-332 (I
O
=
80% Io, max; Vo=5.0 V; Vin=12 V; T
a
=
25
C)
Dimensions
Inches (L W H)
Millimeters (L W H)
1.3 x 0.53 x 0.315
33.02 x 13.46 x 8.00
Weight -
7.8
g
-
Notes
: All specifications are typical at 25
C
unless otherwise stated.
1. The Tref temperature measurement location:
Control Specifications
Parameter
Min
Typ
Max
Notes
Remote On/Off
Signal Low (Unit Off)
-0.3 V
-
0.3 V
Signal High (Unit On)
1 V
-
14 V
Remote On/Off pin open, Unit on.
Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302
Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
NON-ISOLATED DC/DC CONVERTERS
10 V-14 V Input
1.2 V-5.0 V/10 A Output
Output Trim Equations
Equations for calculating the trim resistor (in k) given the desired adjusted voltage (Vadj) and the nominal
output voltage of the converter (Vnom) are shown below. The Trim Down resistor should be connected between
the Trim pin and Vout. The Trim Up resistor should be connected between the Trim pin and Ground. Only one of
the resistors should be used for any given application.
B
V
V
A
R
adj
nom
trimdown
-
-
=
D
V
V
C
R
nom
adj
trimup
-
-
=
Vnom A B C
D
5.0 64.6353
16.01 10.507 1
3.3 39.1049
16.01
10.507
1
2.5 27.0561
16.01
10.507
1
1.8 16.5749
16.01
10.507
1
1.5 12.0693
16.01
10.507
1
1.2 - -
10.507
1
Module
Vout
Trim
GND
Rtrimdown
Module
Vout
Trim
GND
Rtrimup
Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302
Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
NON-ISOLATED DC/DC CONVERTERS
10 V-14 V Input
1.2 V-5.0 V/10 A Output
Efficiency Data
Module 5.0V
50.0%
60.0%
70.0%
80.0%
90.0%
100.0%
1A
2.5A
5A
7.5A 10A
Output Current
E
f
f
i
ci
en
cy
10V
12.0V
14.0V
Module 3.3V
50.0%
60.0%
70.0%
80.0%
90.0%
100.0%
1A 2.5A 5A 7.5A 10A
Output Current
E
f
f
i
ci
en
c
y
10V
12.0V
14.0V
Module 2.5V
50.0%
60.0%
70.0%
80.0%
90.0%
100.0%
1A 2.5A 5A 7.5A 10A
Output Current
E
f
f
i
ci
en
c
y
8.3V
12.0V
14.0V
Module 1.8V
50.0%
60.0%
70.0%
80.0%
90.0%
100.0%
1A 2.5A 5A 7.5A 10A
Output Current
E
ffi
c
i
e
n
c
y
10V
12.0V
14.0V
Module 1.5V
50.0%
60.0%
70.0%
80.0%
90.0%
100.0%
1A 2.5A 5A 7.5A 10A
Output Current
E
f
f
i
ci
en
cy
10V
12.0V
14.0V
Module 1.2V
50.0%
60.0%
70.0%
80.0%
90.0%
100.0%
1A 2.5A 5A 7.5A 10A
Output Current
E
ffi
c
i
e
n
c
y
10V
12.0V
14.0V
Thermal Derating Curve
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