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| NON-ISOLATED DC/DC CONVERTERS 12 Vdc Input Vddq/2 / 8 A Output VRAF-08xT50 Non-Isolated High Efficiency Fixed Frequency Low Cost RoHS Compliant Rev.H Under-Voltage Lockout Output Enable OCP/SCP Current Source/Sink Capability Over Voltage Protection (Hiccup Mode) Tracking a Reference for Output Voltage High Power Density 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 0.9 V 0.9 V Input Voltage 10.8 V - 13.2 V 5.0 V - 13.8 V Max. Output Current 8A 8A Max. Output Power 7.2 W 7.2 W Typical Efficiency 69% 69% Model Number VRAF-08AT50 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". Absolute Maximum Ratings Parameter Input Supply Voltage Input Signal Voltage Operating Temperature Storage Temperature Min -0.5 V -0.3 V 0 C -40 C Typ Max 15 V 5.25 V 70 C 85 C Notes Note: All specifications are typical at 25 C unless otherwise stated. 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 10.8 V 5.0 V 1.2 V Typ 12 V 12 V 25 mA 1.8 V 7 mA Max 13.2 V 13.8 V 1.05 A 2.2 A 35 mA 1.89 V 10 mA Notes 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 Vddq/2 / 8 A Output Min 2.6 V 2.4 V Typ 110 mA 25 mA 0.006 A s 2 Input Specifications (continued) Parameter Input Reflected Ripple Current (pk-pk) Input Reflected Ripple Current (rms) I t Inrush Current Transient Turn on Voltage Threshold Turn off Voltage Threshold 2 Max 180 mA 60 mA 0.012 A s 3.9 V 3.7 V 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@25C. Notes: 1. All specifications are typical at 25 C unless otherwise stated. 2. This power module is not internally fused. An input line fuse must always be used. Output Specifications Parameter Output Voltage Set Point Tracking Tolerance (Vddq/2-Vout)/Vout Load Regulation Line Regulation Output Current Output DC Current Limit Output Ripple and Noise (pk-pk) Output Ripple and Noise (rms) Short Circuit Surge Transient Turn on Time VRAF-08AT50 VRAF-08ET50 Overshoot at Turn on Output Capacitance Transient Response 50% ~ 100% Max Load Settling Time 100% ~ 50% Max Load Settling Time VO =0.9 V 100 mV 20 uS 100 mV 20 uS 200 mV 50 uS 200 mV 50 uS di/dt=0.3 A/uS; Vin12 V; and with a 22 uF / 6.3 V ceramic capacitor at the output. 0 uF 2.5 mS 5 mS 0% 5 mS 8 mS 3% 2200 uF Start up from ENABLE. Min -1.5% 0A 9.2 A Typ Vddq/2 3 mV 3 mV 25 mV 8 mV 1.1 A s 2 Max 1.5% 6 mV 6 mV 8A 14 A 50 mV 15 mV 2.2 A s 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. Note: All specifications are typical at Vin =12 V, Vddq=1.8 V, Io=8 A, Ta= 25C unless otherwise stated. General Specifications Parameter Efficiency Switching Frequency MTBF Dimensions Inches (L x W x H) Millimeters (L x W x H) Weight 0.65 x 0.41 x 0.40 16.51 x 10.41 x 10.16 2.5 g Min 68% 260 kHz Typ 69% 300 kHz 6,416,286 hours Max 340 kHz Notes Vin=12 V, Vddq=1.8 V, Io=8 A Calculated Per Bell Core SR-332 (IO = 80% load; Vin=12 V; Ta = 25 C) - 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 Vddq/2 / 8 A Output Control Specifications Parameter Output Enable ENABLE High ENABLE Low Min 2V 0V Typ Max 5.5 V 0.8 V Notes Enable Pin open, the module is off. Efficiency Data Efficiency Curve 85.0% 80.0% 75.0% 70.0% 65.0% 60.0% 55.0% 50.0% 45.0% 0.8 2.0 4.0 6.0 8.0 Output Current (A) VRAF-08AT50 Efficiency 10.8 V 12.0 V 13.2 V Efficiency Curve 85.0% Efficiency 75.0% 65.0% 55.0% 45.0% 0.8 2.0 4.0 6.0 8.0 Output Current (A) VRAF-08ET50 5.0V 12.0V 13.8V 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 Vddq/2 / 8 A Output Thermal Derating Curve The thermal reference point Tref is shown above. For reliable operation this temperature should not exceed 115C. The output power of the module should not exceed the rated power for the module. Vin=12 V, Vddq=1.8 V 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 Vddq/2 / 8 A Output Ripple and Noise Waveform Note: Ripple and noise at Vin=12 V, Vddq=1.8 V, Io=8 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 Vin=12 V, Vddq=1.8 V 100% to 50% load step at Vin=12 V, Vddq=1.8 V 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. 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 Vddq/2 / 8 A Output Output Tracking Test condition: Vin=12 V, Vddq=1.8 V, Io=8 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 Vddq/2 / 8 A Output Mechanical Outline Pin Connections Pin 1 2 3 4 5 Function Vin Vddq Vout (Vtt) GND Enable RoHS Compliance Complies with the European Directive 2002/95/EC, calling for the elimination of lead and other hazardous substances from electronic products. 2009 Bel Fuse Inc. Specifications subject to change without notice. 042709 CORPORATE Bel Fuse Inc. 206 Van Vorst Street Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com FAR EAST 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 EUROPE 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 |
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