BEL VRAF

NON-ISOLATED DC/DC CONVERTERS
12 Vdc Input
0.9 Vdc / 6 A Output
VRAF-06AT50 RoHS Compliant PRELIMINARY
Rev.A
•
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
0.9 V
Input
Voltage
12 V
Max. Output
Current
6A
Max. Output
Power
5.4 W
Typical
Efficiency
73%
Model Number
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
Input Supply Voltage
Input Signal Voltage
Operating Temperature
Min
-0.5 V
-0.3 V
Typ
-
Max
13.2 V
5.25 V
0 °C
-
65 °C
Storage Temperature
-40 °C
-
85 °C
Notes
Note: All specifications are typical at 25 °C unless otherwise stated.
Input Specifications
Parameter
Operating Input Voltage
Input Current (full load)
Input Current (no load)
Min
10.8 V
Typ
12 V
Max
13.2 V
-
-
1A
-
-
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
-
-
0.006 A s
0.012 A s
Turn on Voltage Threshold
2.79 V
-
2.89 V
Turn off Voltage Threshold
2.59 V
-
2.69 V
2
I t Inrush Current Transient
2
Notes
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
[email protected]°C.
2
Note: All specifications are typical 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
12 Vdc Input
0.9 Vdc / 6 A Output
Output Specifications
Parameter
Min
Typ
Max
-
Vddq/2
-
-1.5%
-
1.5%
Load Regulation
-
5 mV
8 mV
Line Regulation
-
2 mV
4 mV
Output Current
0A
-
6A
Output DC Current Limit
-
-
11 A
Output Ripple and Noise (pk-pk)
-
20 mV
-
Output Ripple and Noise (rms)
-
5 mV
-
Short Circuit Surge Transient
-
1.1 A s
2.2 A s
Turn on Time
-
1 mS
2 mS
Overshoot at Turn on
-
0%
3%
0 uF
-
2200 uF
Output Voltage Set Point
Tracking Tolerance
(Vddq/2-Vout)/Vout
Output Capacitance
2
Notes
Vin=12 V, lout=full load
Test conditions:
0-20 MHz BW, with a 22 uF / 6.3
V ceramic capacitor at the
output.
2
Transient Response
50% ~ 100% Max Load
Settling Time
100% ~ 50% Max Load
VO =0.9 V
Settling Time
-
50 mV
80 mV
-
50 uS
80 uS
-
50 mV
80 mV
-
50 uS
80 uS
di/dt=0.3 A/uS; Vin12 V; and
with a 22 uF / 6.3 V ceramic
capacitor at the output.
Note: All specifications are typical at Vin =12 V, Vddq=1.8 V, Io=6 A, Ta= 25°C unless otherwise stated.
General Specifications
Parameter
Efficiency
Switching Frequency
Min
Typ
Max
-
73%
-
260 kHz
300 kHz
340 kHz
MTBF
Notes
Vin=12 V, Vddq=1.8 V, Io=6 A
Calculated Per Bell Core SR-332 (IO =
80% load; Vin=12 V; Ta = 25 °C)
TBD
Dimensions
Inches (L × W × H)
Millimeters (L × W × H)
Weight
0.65 x 0.41 x 0.40
16.51 x 10.41 x 10.16
-
2.5 g
-
Note: All specifications are typical at 25 °C unless otherwise stated.
Control Specifications
Parameter
Output Enable
Min
Typ
Max
ENABLE High
2V
-
5.5 V
ENABLE Low
0V
-
0.8 V
Notes
Enable Pin open, the module is off.
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
Efficiency Data
Efficiency Curve
Efficiency
80.0%
70.0%
10.8 V
12.0 V
13.2 V
60.0%
50.0%
40.0%
0.6
1.5
3.0
4.5
6.0
Output Current (A)
Thermal Derating Curve
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
Ripple and Noise Waveform
Note: Ripple and noise at Vin=12 V, Vddq=1.8 V, Io=6 A,
with a 22 uF/6.3 V X5R ceramic capacitor at the
output, Ta=25 °C.
Transient Response Waveforms
50% to 100% load step at 12 V input, 0.9 V output
100% to 50% load step at 12 V input, 0.9 V output
Note: Transient response at di/dt=0.3 A/uS, with 22 uF/6.3 V X5R ceramic capacitor at the output, Ta=25 °C.
Output Tracking
Test condition: Vin=12 V, Vddq=1.8 V, Io=6 A.
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
Mechanical Outline
Pin Connections
Pin
Function
1
Vin
2
Vddq
3
Vout (Vtt)
4
GND
5
Enable
RoHS Compliance
Complies with the European Directive 2002/95/EC, calling for the elimination of lead and
other hazardous substances from electronic products.
©2007 Bel Fuse Inc. Specifications subject to change without notice. 013007
CORPORATE
FAR EAST
EUROPE
Bel Fuse Inc.
206 Van Vorst Street
Jersey City, NJ 07302
Tel 201-432-0463
Fax 201-432-9542
www.belfuse.com
Bel Fuse Ltd.
8F/ 8 Luk Hop Street
San Po Kong
Kowloon, Hong Kong
Tel 852-2328-5515
Fax 852-2352-3706
www.belfuse.com
Bel Fuse Europe Ltd.
Preston Technology Management Centre
Marsh Lane, Suite G7, Preston
Lancashire, PR1 8UD, U.K.
Tel 44-1772-556601
Fax 44-1772-888366
www.belfuse.com