VRAF-08XT50_10 Datasheet, PDF (1/8 Pages) Bel Fuse Inc. – NON-ISOLATED DC/DC CONVERTERS

NON-ISOLATED DC/DC CONVERTERS
12 Vdc Input
Vddq/2 / 8 A Output
Dec. 03, 2010
Bel Power Inc., a subsidiary of Bel Fuse Inc.
VRAF-08xT50 RoHS Compliant Rev.J
• Non-Isolated
• High Efficiency
• Fixed Frequency
• Low Cost
• Tracking a Reference for
Output Voltage
• High Power Density
• Under-Voltage Lockout
• Output Enable
• OCP/SCP
• Current Source/Sink Capability
• Over Voltage Protection
(Hiccup Mode)
Description
The Bel VRAF-08xT50 module is a non-isolated, step down dc/dc power converter that operates from a nominal
12 Vdc or wide range 5 Vdc to 13.8 Vdc source. This converter is designed specifically to provide bus termination
voltages in applications such as DDR (double data rate) memory where the bus termination voltage must closely
track the I/O bus voltage. The converter accepts a reference input and uses this to program its output voltage to
50% of the reference. The unit is packaged in compact single-in-line footprint and provides a maximum 8 A
output. Standard features include remote on/off, input under-voltage lockout, output over voltage protection.
Part Selection
Output
Voltage
Input Voltage
0.9 V
5.0 V - 13.8 V
Max. Output
Current
8A
Max. Output
Power
7.2 W
Typical
Efficiency
69%
Model Number
VRAF-08AT50
0.9 V
5.0 V - 13.8 V
8A
7.2 W
69%
VRAF-08ET50
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”.
3. Part number VRAF-08ET50 is better suited for applications where start up is guaranteed at 5V input.
Absolute Maximum Ratings
Parameter
Min
Typ
Max
Input Supply Voltage
-0.5 V
-
15 V
Input Signal Voltage
-0.3 V
5.25 V
Operating Temperature
0 °C
-
70 °C
Storage Temperature
-40 °C
-
85 °C
Note: All specifications are typical at 25 °C unless otherwise stated.
Notes
Input Specifications
Parameter
Operating Input Voltage
VRAF-08AT50
VRAF-08ET50
Input Current (full load)
VRAF-08AT50
VRAF-08ET50
Input Current (no load)
Reference Voltage Range (Vddq)
Remote Off Input Current
Min
5.0 V
5.0 V
-
-
-
1.2 V
-
Typ
12 V
12 V
-
-
25 mA
1.8 V
7 mA
Max
13.8 V
13.8 V
2.2 A
2.2 A
35 mA
1.89 V
10 mA
Notes
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel [phone] • Fax [phone] • www.belfuse.com