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 kHz@25°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