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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
12 Vdc Input
0.9 Vdc / 6 A Output
Non-Isolated
Under-Voltage Lockout
High Efficiency
Output Enable
Fixed Frequency
OCP/SCP
Low Cost
Current Source/Sink Capability
Tracking a Reference for
Output Voltage
Over Voltage Protection
(Hiccup Mode)
High Power Density
Description
The Bel VRAF-06AT50 module is a non-isolated, step down dc/dc power converter that operates from a nominal
12 Vdc source. The output is closely regulated and the efficiency is typically 73% at full load (Vin=12 Vdc).
Part Selection
Output
Voltage
Input
Voltage
Max. Output
Current
Max. Output
Power
Typical
Efficiency
Model Number
0.9 V
12 V
6 A
5.4 W
73%
VRAF-06AT50
Notes: 1. All part numbers above indicate RoHS 6. Change the second letter "R" to "7" for RoHS 5 part numbers.
2. Add “G” suffix at the end of the model numbers listed above to indicate “Tray Packaging”.
Absolute Maximum Ratings
Parameter
Min
Typ
Max
Notes
Input Supply Voltage
-0.5 V
-
13.2 V
Input Signal Voltage
-0.3 V
5.25 V
Operating Temperature
0
°C
-
65
°C
Storage Temperature
-40
°C
-
85
°C
Note: All specifications are typical at 25 °C unless otherwise stated.
Input Specifications
Parameter
Min
Typ
Max
Notes
Operating Input Voltage
10.8 V
12 V
13.2 V
Input Current (full load)
-
1 A
Input Current (no load)
-
50 mA
Reference Voltage Range
1.6 V
1.8 V
1.89 V
Remote Off Input Current
-
3 mA
10 mA
Input Reflected Ripple Current (pk-pk)
-
50 mA
80 mA
Input Reflected Ripple Current (rms)
-
10 mA
-
With simulated source impedance
of 1000 nH, 5 Hz to 20 MHz. Use a
100 uF/25 V Tan cap with
ESR=0.025 ohm max, at 100
kHz@25°C.
I
2t Inrush Current Transient
-
0.006 A
2s
0.012 A
2s
Turn on Voltage Threshold
2.79 V
-
2.89 V
Turn off Voltage Threshold
2.59 V
-
2.69 V
Note: All specifications are typical at 25 °C unless otherwise stated.
VRAF-06AT50 RoHS Compliant PRELIMINARY
Rev.A