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
8.3 V-14 V Input
0.75 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
Wide
Input
Low
Cost
Wide
Trim
Flexible Output Voltage
Remote
On/Off
Remote
Sense
Active
Low/High
(option)
Able to Sink/Source Current
Industrial
Temperature
Range
Description
The Bel SRBC-10A1Ax 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. These modules provide precisely regulated voltage
programmable via external resistor from 0.75 V to 5.0 V over a wide range of input voltage (8.3 V-14 V). 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, wide input, and
programmable output voltage.
Part Selection
Output
Voltage
Input
Voltage
Max. Output
Current
Max. Output
Power
Typical
Efficiency
Model Number
Active Low
Model Number
Active High
0.75 - 5.0 V
8.3 14 V
10 A
50.0 W
95%
SRBC-10A1AL
SRBC-10A1A0
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
Notes
: All specifications are typical at 25
C unless otherwise stated.
SRBC-10A1Ax 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
8.3 V-14 V Input
0.75 V-5.0 V/10 A Output
Input Specifications
Parameter
Min
Typ
Max
Notes
Input Voltage
Vo, set
3.63 V
Vo, set
>
3.63 V
8.3 V
8.3 V
12 V
12 V
14 V
13.2 V
Input Current (full load)
-
-
6.5 A
An input line fuse must always be used.
Input Current (no load)
-
50 mA
-
Remote Off Input Current
-
2 mA
-
Input Reflected Ripple Current (pk-pk)
-
-
400 mA
Input Reflected Ripple Current (rms)
-
-
150 mA
Tested with one 1000uF/25 V AL input
capacitor with ESR=0.03 ohm max and
4 47 uF/16 V tan capacitors with
ESR=0.013 ohm max at 100 kHz, &
simulated source impedance of
1000 nH, 5 Hz to 20 MHz.
I
2
t Inrush Current Transient
-
0.04 A
2
s
0.08 A
2
s
Turn-on Voltage Threshold
-
8.2 V
Turn-off Voltage Threshold
-
7.9 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
-
0.1% Vo,set
-
Line Regulation
-
0.1% Vo,set
-
Regulation Over Temperature
(-40
C to +85 C)
-
0.3% Vo,set
-
Tref=Ta, min to Ta, max
Output Current
0 A
-
10 A
Current Limit Threshold
- 200%
Io,out
-
Short Circuit Surge Transient
- 1
A
2
s 3
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, with
10 uF tantalum capacitor &
1 F ceramic capacitor
Turn on Time
-
6 mS
10 mS
Overshoot at Turn on
-
0%
1%
Output Capacitance
ESR
10 mohm
0 uF
-
5000 uF
Transient Response
50% ~ 100% Max Load
-
100 mV
-
Settling Time
-
50 uS
-
100% ~ 50% Max Load
-
100 mV
-
Settling Time
V
O
= 0.75 V -
5 V
- 50
uS
-
di/dt=2.5 A/uS; Vin=12 V;
and with 2 150 uF polymer
capacitors at the output
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
8.3 V-14 V Input
0.75 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
Vo=0.75 V
-
-
-
-
-
-
-
95%
93%
92%
90%
89%
87.5%
81%
-
-
-
-
-
-
-
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
0.7525 V
-
5.0 V
Remote Sense Compensation
-
-
0.5 V
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 -
8
g
-
Note
: 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)
-0.2 V
-
0.3 V
Signal High (Unit On)
-
-
Vin, max
SRBC-10A1A0; Remote On/Off pin open, Unit
on.
Signal Low (Unit On)
-0.2 V
-
0.3 V
Signal High (Unit Off)
2.5 V
-
Vin, max
SRBC-10A1AL; 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
8.3 V-14 V Input
0.75 V-5.0 V/10 A Output
Output Trim Equations
Equation for calculating the trim resistor (in ) given the desired adjusted voltage (Vadj) is shown below. The
Trim Up resistor should be connected between the Trim pin and Ground.
1000
7525
.
0
10500
-
-
=
adj
trimup
V
R
Equation for calculating the trim voltage (in V) given the desired adjusted voltage (Vadj) is shown below. The
Trim Up voltage should be connected between the Trim pin and Ground.
)
7525
.
0
(
0667
.
0
7
.
0
-
-
=
adj
trimup
V
V
Thermal Derating Curves
SRBC-10A1AL, Vo=0.75 V
SRBC-10A1AL, Vo=1.8 V
SRBC-10A1AL, Vo=3.3 V
SRBC-10A1AL, Vo=5.0 V
Rtrim
Module
Vout
GND
Sense
trim
Vtrim
Module
Vout
GND
Sense
trim
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
8.3 V-14 V Input
0.75 V-5.0 V/10 A Output
Efficiency Data
Module 5.0V
80.0%
90.0%
100.0%
1A
2.5A
5A
7.5A
10A
Output Current
Ef
fic
ie
nc
y
8.3V
12.0V
13.2V
Module 3.3V
80.0%
90.0%
100.0%
1A
2.5A
5A
7.5A
10A
Output Current
Effic
iency
8.3V
12.0V
14.0V
Module 2.5V
80.0%
90.0%
100.0%
1A
2.5A
5A
7.5A
10A
Output Current
Effi
cien
cy
8.3V
12.0V
14.0V
Module 1.8V
70.0%
80.0%
90.0%
100.0%
1A
2.5A
5A
7.5A
10A
Output Current
Ef
fic
ie
nc
y
8.3V
12.0V
14.0V
Module 1.5V
70.0%
80.0%
90.0%
100.0%
1A
2.5A
5A
7.5A
10A
Output Current
Ef
ficie
ncy
8.3V
12.0V
14.0V
Module 1.2V
50.0%
70.0%
90.0%
1A
2.5A
5A
7.5A
10A
Output Current
Effi
ciency
8.3V
12.0V
14.0V
Module 0.75V
50.0%
70.0%
90.0%
1A
2.5A
5A
7.5A
10A
Output Current
Ef
fi
cie
ncy
8.3V
12.0V
14.0V
2005 Bel Fuse Inc. Specifications subject to change without notice. 092005
CORPORATE FAR
EAST
EUROPE
Bel Fuse Inc.
Bel Fuse Ltd.
Bel Fuse Europe Ltd.
206 Van Vorst Street
8F/ 8 Luk Hop Street
Preston Technology Management Centre
Jersey City, NJ 07302
San Po Kong
Marsh Lane, Suite G7, Preston
Tel 201-432-0463
Kowloon, Hong Kong
Lancashire, PR1 8UD, U.K.
Fax 201-432-9542
Tel 852-2328-5515
Tel 44-1772-556601
www.belfuse.com
Fax 852-2352-3706
Fax 44-1772-888366
www.belfuse.com
www.belfuse.com
NON-ISOLATED DC/DC CONVERTERS
8.3 V-14 V Input
0.75 V-5.0 V/10 A Output
RoHS Compliance
Complies with the European Directive 2002/95/EC, calling for the elimination of lead and
other hazardous substances from electronic products.
Pin Connections
Pin
Function
1 Remote
On/Off
2 Vin+
3 N/A
4 Ground
5 Vout+
6 Trim
7 Remote
Sense
BOTTOM VIEW
RECOMMENDED PAD LAYOUT
PAD SIZE:
MIN: 0.14"* 0.095" (3.56mm * 2.41mm)
MAX: 0.165"* 0.11" (4.19mm * 2.79mm)
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