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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
10 V-14 V Input
0.75 V-6.0 V/6 A Output
Non-Isolated
Under-Voltage Lockout (UVLO)
High
Efficiency
OCP/SCP
High
Power
Density
Remote
On/Off
Fixed
Frequency
Wide
Trim
Range
Description
The Bel VRBA-06A1Ax modules are a series of non-isolated dc/dc converters that can deliver up to 6 A of
output current with full load efficiency of 92% at 6.0 V output. These modules provide precisely regulated
voltage programmable via external resistor from 0.75 V to 6.0 V over input voltage (10 V-14 V). 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
Input
Voltage
Max. Output
Current
Max. Output
Power
Typical Efficiency
at 6.0V
Model Number
Active Low
Model Number
Active High
0.75 V - 6.0 V
10 V - 14 V
6 A
36W
92%
VRBA-06A1AL
VRBA-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
Note
: All specifications are typical at 25
C unless otherwise stated.
Input Specifications
Parameter
Min
Typ
Max
Notes
Input Voltage
10 V
12 V
14 V
Input Current (full load)
Vo=6.0 V
Vo=5.0 V
Vo=3.3 V
Vo=2.5 V
Vo=1.8 V
Vo=0.75 V
-
-
-
-
-
-
3.5 A
2.8 A
1.9 A
1.5 A
1.1 A
0.55 A
-
-
-
-
-
-
Input Current (no load)
Vo=6.0 V
Vo=0.75 V
-
-
-
-
100 mA
20 mA
Remote Off Input Current
-
3 mA
5 mA
VRBA-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
10 V-14 V Input
0.75 V-6.0 V/6 A Output
Input Specifications (continued)
Parameter
Min
Typ
Max
Notes
Input Reflected Ripple Current (pk-pk)
-
120 mA
-
Input Reflected Ripple Current (rms)
-
40 mA
-
Tested with two 100 uF/25 V tan input
capacitors & simulated source
impedance of 1uH, 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
-
9.5 V
9.8 V
Turn-off Voltage Threshold
-
9.0 V
9.5 V
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
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 +85 C)
-
0.5%Vo,set
-
Tref=Ta, min to Ta, max
Output Current
0 A
-
6 A
Current Limit Threshold
7 A
-
15 A
Short Circuit Surge Transient
-
0.25 A
2
s -
Ripple and Noise (pk-pk)
Vo=6.0 V
Vo=5.0 V
Vo=3.3 V
Vo=2.5 V
Vo=1.8 V
Vo=0.75 V
-
-
-
-
-
-
85 mV
75 mV
60 mV
50 mV
40 mV
20 mV
-
-
-
-
-
-
Ripple and Noise (rms)
Vo=6.0 V
Vo=5.0 V
Vo=3.3 V
Vo=2.5 V
Vo=1.8 V
Vo=0.75 V
-
-
-
-
-
-
30 mV
25 mV
20 mV
15 mV
12 mV
7 mV
-
-
-
-
-
-
Tested with 0-20 MHz, with
10 uF/10 V tantalum capacitor
and 1uF/10 V ceramic
capacitor at the output
Turn on Time
-
15 mS
25 mS
Overshoot at Turn on
-
0%
3%
Output Capacitance
ESR
1mohm
ESR
10mohm
0 uF
0 uF
-
-
1000 uF
3300 uF
Transient Response
50% ~ 100% Max Load
-
200 mV
-
Settling Time
-
50 uS
-
100% ~ 50% Max Load
-
200 mV
-
Settling Time
V
O
= 0.75 V -
6.0 V
- 50
uS
-
di/dt=2.5 A/uS; Vin=12 V; and
with 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
10 V-14 V Input
0.75 V-6.0 V/6 A Output
General Specifications
Parameter
Min
Typ
Max
Notes
Efficiency
Vo=6.0 V
Vo=5.0 V
Vo=3.3 V
Vo=2.5 V
Vo=1.8 V
Vo=0.75 V
-
-
-
-
-
-
92%
90%
88%
85%
83%
71%
-
-
-
-
-
-
Measured at Vin=12 V, full load
Switching Frequency
280 kHz
300 kHz
320 kHz
Over Temperature Shutdown
-
135
C
-
MTBF
3,266,517 hours
Calculated Per Bell Core SR-332 (I
O
=
Nominal; T
a
= 25
C)
Dimensions
Inches (L W H)
Millimeters (L W H)
1.0 x 0.5 x 0.243
25.4 x 12.7 x 6.16
Weight -
3
g
-
Note
: All specifications are typical at 25
C
unless otherwise stated.
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
VRBA-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
VRBA-06A1AL; Remote On/Off pin open, Unit
on.
Output Voltage Trim Range
(Wide Trim)
0.7525 V
-
6.3 V
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
10 V-14 V Input
0.75 V-6.0 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
EF
F
I
C
I
EN
CY
10V
12.0
14.0
MODULE 3.3V
60.0%
70.0%
80.0%
90.0%
1A
2A
3A
4A
5A
6A
OUTPUT CURRENT
E
F
F
I
CIE
N
CY
10.0
12.0
14.0
MODULE 1.8V
60.0%
70.0%
80.0%
90.0%
100.0%
1A
2A 3A
4A 5A
6A
OUTPUT CURRENT
E
F
F
I
CI
E
N
CY
10.0
12.0
14.0
MODULE 0.75V
50.0%
60.0%
70.0%
80.0%
90.0%
1A
2A
3A
4A
5A
6A
OUTPUT CURRENT
EF
FI
CI
EN
CY
10.0
12.0
14.0
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
10 V-14 V Input
0.75 V-6.0 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=3.3 V
Vin=12 V, Vo=6.0 V
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