NON-ISOLATED DC/DC CONVERTERS
8.3 Vdc - 14 Vdc Input
0.75 Vdc - 5.5 Vdc/6 A Output
SRBA-06A2Ax
•
•
•
•
•
•
Non-Isolated
High Efficiency
High Power Density
Fixed Frequency
Remote On/Off
Active Low/High
RoHS Compliant
•
•
•
•
•
Rev.A
Under-Voltage Lockout (UVLO)
OCP/SCP
Wide Input
Wide Trim Range
Flexible Output Voltage Sequencing
Description
The Bel SRBA-06A2Ax 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 Vdc output. These modules provide precisely regulated voltage
programmable via external resistor from 0.75 Vdc to 5.5 Vdc over a wide range of input voltage (8.3 Vdc - 14
Vdc). 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
0.75 V - 5.5 V
Input
Voltage
8.3 V - 14 V
Max. Output
Current
6A
Max. Output
Power
33 W
Typical
Efficiency
92%
Model Number
Active Low
SRBA-06A2AL
Model Number
Active High
SRBA-06A2A0
Notes:
1. Add “G” suffix at the end of the model numbers listed above to indicate “Tray Packaging”
2. 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
Sequencing Voltage
1
Min
-0.3 V
-0.3 V
-0.3 V
-40
°C
-55
°C
Typ
-
-
-
-
-
Max
15 V
15 V
Vin
85
°C
125
°C
Notes
Ambient Temperature
Storage Temperature
Notes:
All specifications are typical at 25
°C
unless otherwise stated.
1. SRBA-06A2Ax 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 the SEQ pin
floating.
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 Vdc - 14 Vdc Input
0.75 Vdc - 5.5 Vdc/6 A Output
Input Specifications
Parameter
Input Voltage
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
Input Current (no load)
Vo=5.0 V
Vo=0.75 V
Remote Off Input Current
Input Reflected Ripple Current
(pk-pk)
Input Reflected Ripple Current
(rms)
I t Inrush Current Transient
Turn-on Voltage Threshold
Turn-off Voltage Threshold
2
Min
8.3 V
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Typ
12 V
2.75 A
1.85 A
1.45 A
1.05 A
0.75 A
0.55 A
-
-
1 mA
120 mA
40 mA
0.002 A s
8.1 V
7.5 V
2
Max
14 V
4.0 A
2.8 A
2.2 A
1.6 A
1.1 A
0.8 A
100 mA
20 mA
2 mA
-
-
0.02 A s
8.2 V
8.0 V
2
Notes
Tested with two 100 uF/25 V tan
input capacitors & simulated source
impedance of 1 uH, 5 Hz to 20 MHz.
Notes:
All specifications are typical at 25
°C
unless otherwise stated.
Output Specifications
Parameter
Output Voltage Set Point
Output Voltage Set Point
Adjustment Range Selected by
External Resistor or Voltage
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=0.75 V-3.63 V
Ripple and Noise (rms)
Vo=0.75 V-3.63 V
Ripple and Noise (pk-pk)
Vo=5.0 V
Ripple and Noise (rms)
Vo=5.0 V
Turn on Time
Overshoot at Turn on
Output Capacitance
ESR
≥
1 mohm
ESR
≥
10 mohm
Min
-2%Vo,set
-2.5%Vo,set
0.7525 V
-
-
-
0A
7.2 A
-
-
-
-
-
-
-
0 uF
0 uF
Typ
-
-
-
0.4%Vo,set
0.3%Vo,set
0.5%Vo,set
-
-
0.25 A s
50 mV
15 mV
75 mV
30 mV
8 mS
0%
-
-
2
Max
2%Vo,set
3.5%Vo,set
5.5 V
-
-
-
6A
18 A
-
75 mV
30 mV
100 mV
40 mV
10 mS
3%
1000 uF
3000 uF
Notes
Vin=12 V, full load
Over all operating input
voltages, resistive loads and
temperature conditions
Io=Io, min to Io, max
Vin=Vin, min to Vin, max
Tref=Ta, min to Ta, max
Tested with 0-20 MHz, with
10 uF/10 V tantalum
capacitor & 1 uF/10 V TDK
ceramic capacitor at the
output.
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 Vdc - 14 Vdc Input
0.75 Vdc - 5.5 Vdc/6 A Output
Output Specifications (continued)
Parameter
Transient Response
50% ~ 100% Max Load
Settling Time
100% ~ 50% Max Load
Settling Time
V
O
=
0.75 - 5.5 V
-
-
-
-
200 mV
50 uS
200 mV
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.
Min
Typ
Max
Notes
Note:
All specifications are typical at nominal input (Vin=12 V), full load at 25
°C
unless otherwise stated.
General Specifications
Parameter
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
Switching Frequency
Over Temperature Shutdown
Output Trim Range (wide trim)
MTBF
Dimensions
Inches (L
×
W
×
H)
Millimeters (L
×
W
×
H)
Weight
-
0.8 x 0.45 x 0.251
20.32 x 11.42 x 6.38
3g
90%
87%
85%
83%
79%
71%
250 kHz
-
0.7525 V
92%
89%
88%
86%
82%
74%
300 kHz
135
°C
-
3,079,469 hours
-
-
-
-
-
-
350 kHz
-
5.5 V
Calculated Per Bell Core SR-332 (I
O
=
Nominal; 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
Signal Low (Unit Off)
Signal High (Unit On)
Signal Low (Unit On)
Signal High (Unit Off)
Sequencing Voltage
Sequencing Slew Rate Capability
Sequencing Delay Time
Tracking Accuracy
Power-Up
Power-Down
-
-
100 mV
200 mV
200 mV
400 mV
Min
-0.3 V
2.5 V
-0.3 V
2.5 V
0V
-
10 mS
Typ
-
-
-
-
-
-
-
Max
0.4 V
14 V
0.4 V
14 V
Vin
2 V/mS
-
Delay from Vin, min to application of voltage
on SEQ pin
Notes
SRBA-06A2A0; Remote On/Off pin open, Unit
on.
SRBA-06A2AL; Remote On/Off pin open, Unit
on.
Sequencing Voltage applied on SEQ pin
should be higher than output voltage.
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 Vdc - 14 Vdc Input
0.75 Vdc - 5.5 Vdc/6 A Output
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
8.3 Vdc - 14 Vdc Input
0.75 Vdc - 5.5 Vdc/6 A Output
Efficiency Data
MODULE 3.3V
95.0%
90.0%
85.0%
80.0%
75.0%
70.0%
65.0%
60.0%
1A
2A
3A
4A
5A
6A
OUTPUT CURRENT
MODULE 5.0V
100.0%
EFFICIENCY
95.0%
90.0%
85.0%
80.0%
75.0%
1A
2A
3A
4A
5A
6A
OUTPUT CURRENT
8.3V
12.0V
14.0V
EFFICIENCY
8.3V
12.0V
14.0V
MODULE 2.5V
95.0%
90.0%
85.0%
80.0%
75.0%
70.0%
65.0%
60.0%
1A
2A
3A
4A
5A
6A
OUTPUT CURRENT
MODULE 1.8V
95.0%
90.0%
85.0%
80.0%
75.0%
70.0%
65.0%
60.0%
1A
2A
3A
4A
5A
6A
OUTPUT CURRENT
EFFICIENCY
EFFICIENCY
8.3V
12.0V
14.0V
8.3V
12.0V
14.0V
MODULE 1.2V
90.0%
EFFICIENCY
80.0%
70.0%
60.0%
50.0%
1A
2A
3A
4A
5A
6A
OUTPUT CURRENT
MODULE 0.75V
90.0%
EFFICIENCY
8.3V
12.0V
14.0V
80.0%
70.0%
60.0%
50.0%
1A
2A
3A
4A
5A
6A
OUTPUT CURRENT
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
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