NON-ISOLATED DC/DC CONVERTERS
4.5 Vdc - 14 Vdc Input
0.75 Vdc - 5.0 Vdc/3 A Output
SRBA-03E1Ax
•
•
•
•
•
Non-Isolated
Fixed Frequency
High Efficiency
High Power Density
RoHS Compliant
•
•
•
•
•
Rev.A
OCP/SCP
Remote On/Off
Wide Trim Range
Wide Input Range
Active Low/Active High (Option)
Under-voltage Lockout (UVLO)
Description
The Bel SRBA-03E1Ax modules are a series of non-isolated dc/dc converters that deliver up to 3 A of output
current with full load efficiency of 93% at 5.0 Vdc output. These modules provide precisely regulated voltage
programmable via external resistor from 0.75 Vdc to 5.0 Vdc over a wide range of input voltage. Their open-
frame construction and small footprint enable designers to develop cost and space-efficient solutions. Standard
features include remote On/Off, programmable output voltage and over current protection.
Part Selection
Output
Voltage
0.75 V - 5.0 V
1
Input
Voltage
4.5 V - 14 V
Max. Output
Current
3A
Max. Output
Power
15 W
Typical
Efficiency at 5.0V
93%
Model Number
Active High
SRBA-03A1A0
Model Number
Active Low
SRBA-03A1AL
Notes:
1. These modules use a buck topology, so the output voltages must be 0.5 V less than the input voltage.
2. Add “G” to the end of the Model Number to indicate Tray Packaging.
3. All part numbers above indicate RoHS 6. Change the second letter "R" to "7" for RoHS 5 part numbers.
Absolute Maximum Ratings
Parameter
Input Voltage (continuous)
Output Enable Terminal Voltage
Ambient Temperature
Storage Temperature
Min
-0.3 V
-0.3 V
-40
°C
-55
°C
Typ
-
-
-
-
Max
15 V
15 V
85
°C
125
°C
Notes
Note:
All specifications are typical at 25
°C
unless otherwise stated.
Input Specifications
Parameter
Input Voltage
Vo set=5 V
Vo set≤3.3 V
Input Current (full load)
Vo=5.0 V
Vo=3.3 V
Vo=0.75 V
Input Current (no load)
Vo=5.0 V
Vo=3.3 V
Vo=0.75 V
Remote Off Input Current
-
-
-
-
65 mA
50 mA
15 mA
3 mA
80 mA
60 mA
20 mA
6 mA
-
-
-
1.35 A
1.00 A
0.25 A
3.70 A
2.50 A
0.65 A
7.0 V
4.5 V
12 V
12 V
14 V
14 V
Min
Typ
Max
Notes
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
4.5 Vdc - 14 Vdc Input
0.75 Vdc - 5.0 Vdc/3 A Output
Min
-
-
-
-
-
-
-
-
-
3.8 V
3.8 V
Typ
150 mA
100 mA
35 mA
30 mA
20 mA
8 mA
2
0.01 A s
5.5 V
4.3 V
5.5 V
4.0 V
Max
200 mA
150 mA
45 mA
40 mA
35 mA
15 mA
2
0.02 A s
6.5 V
4.5 V
6.0 V
4.3 V
Notes
Tested with simulated source
impedance of 1uH, 5 Hz to 20 MHz and
two 100 uF/25 V external input
Tantalum capacitors.
Input Specifications (continued)
Parameter
Input Reflected Ripple Current (pk-pk)
Vo=5.0 V
Vo=3.3 V
Vo=0.75 V
Input Reflected Ripple Current (rms)
Vo=5.0 V
Vo=3.3 V
Vo=0.75 V
2
I t Inrush Current Transient
Turn-on Voltage Threshold
Vo set=5 V
Vo set≤3.3 V
Turn-off Voltage Threshold
Vo set=5 V
Vo set≤3.3 V
Output Specifications
Parameter
Output Voltage Set Point
Output Voltage Set Point
Load Regulation
Line Regulation
Regulation Over Temperature
(-40
°C
to +85
°C)
Output Current
Current Limit Threshold
Short Circuit Surge Transient
Ripple and Noise (pk-pk)
Vo=5.0 V
Vo=3.3 V
Vo=0.75 V
Ripple and Noise (rms)
Vo=5.0 V
Vo=3.3 V
Vo=0.75 V
Ripple and Noise (pk-pk)
Vo=5.0 V
Vo=3.3 V
Vo=0.75 V
Ripple and Noise (rms)
Vo=5.0 V
Vo=3.3 V
Vo=0.75 V
Turn on Time
Overshoot at Turn on
Output Capacitance
Transient Response
50% ~ 100% Max Load
Settling Time
All
100% ~ 50% Max Load
Settling Time
Min
-2%Vo,set
-3.5%Vo,set
0.4%Vo,set
0.4%Vo,set
-
0A
5A
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
0 uF
-
-
-
-
Typ
-
-
0.2%Vo,set
0.3%Vo,set
0.5%Vo,set
-
-
2
0.1A s
100 mV
80 mV
55 mV
30 mV
20 mV
15 mV
60 mV
40 mV
20 mV
15 mV
12 mV
5 mV
8 mS
0%
-
150 mV
25 uS
150 mV
25 uS
Max
2%Vo,set
2.5%Vo,set
0.4%Vo,set
0.4%Vo,set
-
3A
9.5 A
2
0.2 A s
120 mV
100 mV
80 mV
40 mV
30 mV
20 mV
80 mV
50 mV
30 mV
25 mV
20 mV
10 mV
12 mS
3%
1200 uF
200 mV
40 uS
200 mV
40 uS
Test conditions:
0-20 MHz BW, with external
10 uF/10 V Tantalum capacitor
and 1uF/10V ceramic capacitor
at the output.
Notes
Vin=12 V, lo=lomax
Over all operating input
voltage, resistive load, and
temperature conditions
lo=lomin to lomax
Vin=Vinmin to Vinmax
Test conditions:
0-20 MHz BW, with external
10 uF/10 V Tantalum capacitor
1uF/10V ceramic capacitor and
two 22 uF/10 V ceramic
capacitors at the output.
Test conditions: di/dt = 2.5 A/uS,
Vin=12 V, and with external
10 uF/10 V Tantalum capacitor and
1uF/10 V ceramic capacitor at the
output.
Note:
All specifications are typical at nominal input (Vin=12 V), 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
4.5 Vdc - 14 Vdc Input
0.75 Vdc - 5.0 Vdc/3 A Output
General Specifications
Parameter
Efficiency
Vo=5.0 V
Vo=3.3 V
Vo=0.75 V
Switching Frequency
Output Voltage Trim Range
(Wide Trim)
MTBF
Dimensions (Surface Mount)
Inches (L
×
W
×
H)
Millimeters (L
×
W
×
H)
Weight
90%
88%
77%
200 kHz
0.7525 V
93%
91%
80%
230 kHz
-
6,350,000 hours
0.8 x 0.45 x 0.251
20.32 x 11.42 x 6.38
2.5 g
-
-
-
250 kHz
5V
Calculated Per Bell Core SR-332 (I
O
=
80% load; T
a
= 25
°C)
Measured at Vin=12 V, full load
Min
Typ
Max
Notes
-
-
Note:
All specifications are typical at 25
°C
unless otherwise stated.
Control Specifications
Parameter
Remote On/Off
Signal Low (Unit Off)
Signal High (Unit On)
Signal Low (Unit On)
Signal High (Unit Off)
Min
-0.3 V
2.5 V
-0.3 V
2.5 V
Typ
-
-
-
-
Max
0.4 V
14 V
0.4 V
14 V
Remote On/Off pin open, Unit on.
Notes
Output Trim Equations
Equation for calculating the trim resistor (in kΩ) given the desired adjusted voltage (Vadj) is shown below. The
Trim Up resistor should be connected between the Trim pin and Ground.
Vout
R
trim
=
10.507
−
1
V
adj
−
0.7525
Module
Trim
GND
Rtrim
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.
Vout
V
trim
=
0.7
−
0.0667
×
(
V
adj
−
0.7525)
Module
Trim
Vtrim
GND
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
4.5 Vdc - 14 Vdc Input
0.75 Vdc - 5.0 Vdc/3 A Output
Efficiency Data
MODULE 5.0V
100.0%
EFFICIENCY
90.0%
80.0%
70.0%
60.0%
0.30A
0.75A
1.50A
2.25A
OUTPUT CURRENT
7.0V
12.0V
14.0V
3.00A
MODULE 3.3V
95.0%
90.0%
85.0%
80.0%
75.0%
70.0%
65.0%
60.0%
0.30A
EFFICIENCY
4.5V
12.0V
14.0V
0.75A
1.50A
2.25A
3.00A
OUTPUT CURRENT
MODULE 0.75V
90.0%
EFFICIENCY
80.0%
70.0%
60.0%
50.0%
0.30A
4.5V
12.0V
14.0V
1.75A
1.50A
2.25A
3.00A
OUTPUT CURRENT
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
4.5 Vdc - 14 Vdc Input
0.75 Vdc - 5.0 Vdc/3 A Output
Thermal Derating Curves
Vin=12 V, Vo=5.0 V
Vin=12 V, Vo=3.3 V
Vin=12 V, Vo=0.75 V
Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302
•
Tel 201-432-0463
•
Fax 201-432-9542
•
www.belfuse.com
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