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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
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
Sequencing
Remote On/Off
Active
Low/High
(option)
Remote
Sense
Industrial
Temperature
Range
Able to Sink/Source Current
Description
The Bel SRBC-10A2Ax 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). These
modules have a sequencing feature that enables designers to implement various types of output voltage
sequencing when powering multiple voltages on a board. 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 V - 5.0 V
8.3 V
-
14 V
10 A
50.0 W
95%
SRBC-10A2AL
SRBC-10A2A0
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
Sequencing Voltage
1
-0.3
V
-
Vin
Ambient Temperature
-40
C
-
85
C
Storage Temperature
-55
C
-
125
C
Notes
: All specifications are typical at 25
C unless otherwise stated.
1. SRBC-10A2Ax series of modules include a sequencing feature that enables users to implement
various types of output voltage sequencing in their applications. This is accomplished via an additional
sequencing pin. When the sequencing feature is not used, tie the SEQ pin to Vin or leave it
unconnected.
SRBC-10A2Ax 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 1000 uF/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 -
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 uF ceramic capacitor
Turn on Time
-
6 mS
10 mS
Overshoot at Turn on
-
-
1% Vo,set
Output Capacitance
-
-
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
MTBF
4,982,651 hours
Calculated Per Bell Core SR-332 (I
O
= 80%
Io,max; Vo=5 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 -
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-10A2A0; 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-10A2AL; Remote On/Off pin open, Unit
on.
Voltage Sequencing
Sequencing Delay Time
10 mS
-
-
Delay from Vin, min to application of voltage
on SEQ pin
Sequencing Slew Rate Capability
-
-
2 V/mS
Tracking Accuracy
Power-Up
Power-Down
-
-
100 mV
300 mV
200 mV
500 mV
Vin, min to Vin, max; Io, min to Io, max;
Vseq<Vo
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
Vo=0.75 V
Vo=1.8 V
Vo=3.3 V
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
Eff
ici
enc
y
8.3V
12.0V
14.0V
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