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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/6 A Output
Non-Isolated
Under-Voltage
Lockout
(UVLO)
High
Efficiency
OCP/SCP
High
Power
Density
Wide Input Range
Fixed
Frequency
Wide Output Trim Range
Remote
On/Off
Active
Low/High
Description
The Bel SRBA-06A1Ax modules are a series of non-isolated dc/dc converters that deliver up to 6 A of output
current with full load efficiency of 92% at 5.0 V output. These modules pro Vide 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 V - 5.0 V
8.3 V - 14 V
6 A
30.0 W
92%
SRBA-06A1AL
SRBA-06A1A0
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 other Wise stated.
Input Specifications
Parameter
Min
Typ
Max
Notes
Input Voltage
8.3 V
12 V
14 V
Input Current (full load)
Vo=5.0 V
Vo=3.3 V
Vo=2.5 V
Vo=1.8 V
Vo=1.2 V
Vo=0.75 V
-
-
-
-
-
-
2.75 A
1.85 A
1.45 A
1.05 A
0.75 A
0.55 A
4.0 A
2.8 A
2.2 A
1.6 A
1.1 A
0.8 A
Input Current (no load)
Vo=5.0 V
Vo=0.75 V
-
-
-
-
100 mA
20 mA
Remote Off Input Current
-
1 mA
2 mA
Input Reflected Ripple Current (pk-pk)
-
120 mA
-
Input Reflected Ripple Current (rms)
-
40 mA
-
Tested with two 100 uF/25 V tantalum
input capacitors & simulated source
impedance of 1 uH, 5 Hz to 20 MHz.
I
2
t Inrush Current Transient
-
0.002 A
2
s
0.02 A
2
s
Turn-on Voltage Threshold
-
8.1 V
8.2 V
Turn-off Voltage Threshold
-
7.5 V
8.0 V
SRBA-06A1Ax 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/6 A Output
Output Specifications
Parameter
Min
Typ
Max
Notes
Output Voltage Set Point
-2% Vo,set
-
2% Vo,set
Vin=12 V, full load
Output Voltage Set Point
-2.5% Vo,set
-
3.5% Vo,set
Over all operating input
voltages, resistive loads and
temperature conditions
Adjustment Range Selected by
External Resistor or Voltage
0.7525 V
-
5.0 V
Load Regulation
-
0.4% Vo,set
-
Io=Io, min to Io, max
Line Regulation
-
0.3% Vo,set
-
Vin= Vin, min to Vin, max
Regulation Over Temperature
(-40
C to +8 C)
-
0.5% Vo,set
-
Tref=Ta, min to Ta, max
Output Current
0A - 6A
Current Limit Threshold
7.2A - 18A
Short Circuit Surge Transient
-
0.25A
2
s -
Ripple and Noise (pk-pk)
Vo=0.75 V-3.63 V
-
50 mV
75 mV
Ripple and Noise (rms)
Vo=0.75 V-3.63 V
-
15 mV
30 mV
Ripple and Noise (pk-pk)
Vo=5.0 V
-
75 mV
100 mV
Ripple and Noise (rms)
Vo=5.0 V
-
30 mV
40 mV
Tested with 0-20MHz, with
10 uF/10 V tantalum capacitor
& 1 uF/10 V TDK ceramic
capacitor at the output.
Turn on Time
-
8 mS
10 mS
Overshoot at Turn on
-
0%
3%
Output Capacitance
ESR
1 mohm
ESR
10 mohm
0 uF
0 uF
-
-
1000 uF
3300 uF
Transient Response
50% ~ 100% Max Load
-
200 m V
-
Settling Time
-
50 uS
-
100% ~ 50% Max Load
-
200 m V
-
Settling Time
V
O
= 0.75 V
-5 V
- 50
uS
-
di/dt=2.5 A/uS; Vin=12 V; and
With 10 uF/10 V tantalum
capacitor & 1 uF/10 V ceramic
capacitor at the output.
Note
: All specifications are typical at nominal input, full load at 25
C
unless other wise stated.
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=1.2 V
Vo=0.75 V
90%
87%
85%
83%
79%
71%
92%
89%
88%
86%
82%
74%
-
-
-
-
-
-
Measured at Vin=12 V, full load
Switching Frequency
250 kHz
300 kHz
350 kHz
Over Temperature Shutdown
-
135
C
-
Output Trim Range (Wide trim)
0.7525 V
-
5 V
MTBF
3,079,469 hours
Calculated Per Bell Core SR-332 (I
O
=
Nominal; T
a
= 25
C)
Dimensions
Inches (L W H)
Millimeters (L W H)
0.8 x 0.45 x 0.251
20.32 x 11.42 x 6.38
Weight -
3
g
-
Note
: All specifications are typical at 25
C
unless other wise 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/6 A Output
Control Specifications
Parameter
Min
Typ
Max
Notes
Remote On/Off
Signal Low (Unit Off)
-0.3 V
-
0.4 V
Signal High (Unit On)
2.5 V
-
14 V
SRBA-06A1A0; Remote On/Off pin open, Unit
on.
Signal Low (Unit On)
-0.3 V
-
0.4 V
Signal High (Unit Off)
2.5 V
-
14 V
SRBA-06A1AL; Remote On/Off pin open, Unit
on.
Output Trim Equations
Equation for calculating the trim resistor (in k) given the desired adjusted voltage (Vadj) is shown below. The
Trim Up resistor should be connected between the Trim pin and Ground.
1
7525
.
0
507
.
10
-
-
=
adj
trim
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
trim
V
V
Rtrim
Module
Vout
GND
Trim
Vtrim
Module
Vout
GND
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/6 A Output
Efficiency Data
MODULE 5.0V
75.0%
80.0%
85.0%
90.0%
95.0%
100.0%
1A 2A 3A 4A 5A 6A
OUTPUT CURRENT
E
FFI
C
I
E
N
C
Y
8.3
12.0
14.0
MODULE 3.3V
60.0%
65.0%
70.0%
75.0%
80.0%
85.0%
90.0%
95.0%
1A
2A
3A
4A
5A
6A
OUTPUT CURRENT
EF
FI
CI
EN
CY
8.3V
12.0V
14.0V
MODULE 2.5V
60.0%
65.0%
70.0%
75.0%
80.0%
85.0%
90.0%
95.0%
1A
2A
3A
4A
5A
6A
OUTPUT CURRENT
E
F
F
I
CI
ENCY
8.3V
12.0V
14.0V
MODULE 1.8V
60.0%
65.0%
70.0%
75.0%
80.0%
85.0%
90.0%
95.0%
1A
2A
3A
4A
5A
6A
OUTPUT CURRENT
EFF
I
CI
EN
CY
8.3V
12.0V
14.0V
MODULE 1.2V
50.0%
60.0%
70.0%
80.0%
90.0%
1A
2A
3A
4A
5A
6A
OUTPUT CURRENT
EFFI
C
I
EN
C
Y
8.3V
12.0V
14.0V
MODULE 0.75V
50.0%
60.0%
70.0%
80.0%
90.0%
1A
2A
3A
4A
5A
6A
OUTPUT CURRENT
EF
F
I
CI
E
N
CY
8.3V
12.0V
14.0V
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/6 A Output
Thermal Derating Curves
Vin=12 V, Vo=0.75 V
Vin=12 V, Vo=2.5 V
Vin=12 V, Vo=5.0 V
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