VRAF-08AT51

NON-ISOLATED DC/DC CONVERTERS 12 Vdc Input Sep. 29, 2011 Vddq/2 8 A Output Bel Power Inc., a subsidiary of Bel Fuse Inc. RoHS Compliant      VRAF-08AT51       Non-Isolated High Efficiency Fixed Frequency Low Cost Rev.D 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-08AT51 module is a non-isolated, step down dc/dc power converter that operates from a nominal 12 Vdc or wide range 10.8 Vdc to 13.2 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 Input Voltage 10.8 V - 13.2 V Max. Output Current 8A Max. Output Power 7.2 W Typical Efficiency 69% Model Number VRAF-08AT51 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”. Part Number Explanation V R AF – 08 A T5 1 12 3 45 6 7 1---Vertical Mount 2---RoHS 6, change “R” to “7” means RoHS 5 3---0.65"x0.41" DDR 4---Output current 8A 5---12V narrow range, 10.8-13.2V 6---Vout =0.5Vddq 7---Option 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 Sep. 29, 2011 Vddq/2 8 A Output Bel Power Inc., a subsidiary of Bel Fuse Inc. Min -0.5 V -0.3 V 0 C -40 C Typ Max 15 V 5.25 V 70 C 85 C Notes Absolute Maximum Ratings Parameter Input Supply Voltage Input Signal Voltage Operating Temperature Storage Temperature 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) Reference Voltage Range (Vddq) Remote Off Input Current Min 10.8 V 1.2 V Min 2.6 V 2.4 V Typ 12 V 25 mA 1.8 V 7 mA Typ 110 mA 25 mA 0.006 A s 2 Max 13.2 V 1.05 A 35 mA 1.89 V 10 mA Max 180 mA 60 mA 0.012 A s 3.9 V 3.7 V 2 Notes 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 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. 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 Overshoot at Turn on Output Capacitance Min -1.5% 0A 9.2 A 0 uF Typ Vddq/2 3 mV 3 mV 25 mV 8 mV 1.1 A s 2.5 mS 0% 2 Max 1.5% 6 mV 6 mV 8A 14 A 50 mV 15 mV 2.2 A s 5 mS 3% 2200 uF 2 Notes Vin=12 V, lout=full load Test conditions: 0-20 MHz BW, with 13 X 10uF 0603 ceramics + 1 X 47uF 1206 ceramic at the output. Start up from ENABLE. 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 Sep. 29, 2011 Transient Response 12.5% ~ 62.5%Max Load Settling Time 62.5% ~ 12.5%Max Load Settling Time VO =0.9 V 80 mV 30 uS 80 mV 30 uS 120 mV 50uS 120 mV 50 uS di/dt=1A/uS; Vin12 V; and with 13 X 10uF 0603 ceramics + 1 X 47uF 1206 ceramic at the output. Vddq=1.5V. Vddq/2 8 A Output Bel Power Inc., a subsidiary of Bel Fuse Inc. Note: All specifications are typical at Vin =12 V, Vddq=1.8 V, Io=8 A, Ta= 25°C unless otherwise stated. General Specifications Parameter Efficiency Switching Frequency MTBF 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 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. 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-08AT51 Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302  Tel 201-432-0463  Fax 201-432-9542  www.belfuse.com Efficiency 10.8 V 12.0 V 13.2 V NON-ISOLATED DC/DC CONVERTERS 12 Vdc Input Sep. 29, 2011 Vddq/2 8 A Output Bel Power Inc., a subsidiary of Bel Fuse Inc. Thermal Derating Curve The thermal reference point Tref is shown above. For reliable operation this temperature should not exceed 115C. 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 Sep. 29, 2011 Vddq/2 8 A Output Bel Power Inc., a subsidiary of Bel Fuse Inc. Ripple and Noise Waveform Note: Ripple and noise at Vin=12 V, Vddq=1.5 V, Io=8 A, with 13 X 10uF 0603 ceramics + 1 X 47uF 1206 ceramic at the output, Ta=25 C. Transient Response Waveforms 12.5% to 62.5% load step at Vin=12 V, Vddq=1.5V 62.5% to 12.5% load step at Vin=12 V, Vddq=1.5V Note: Transient response at di/dt=1A/uS, with 13 X 10uF 0603 ceramics + 1 X 47uF 1206 ceramic 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 Sep. 29, 2011 Vddq/2 8 A Output Bel Power Inc., a subsidiary of Bel Fuse Inc. 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 Sep. 29, 2011 Vddq/2 8 A Output Bel Power Inc., a subsidiary of Bel Fuse Inc. Mechanical Outline Pin Connections Pin 1 2 3 4 5 Function Vin Vddq Vout GND Enable 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 Sep. 29, 2011 Vddq/2 / 8 A Output Bel Power Inc., a subsidiary of Bel Fuse Inc. Revision History Date 2011-08-19 2011-8-23 2011-8-30 2011-9-29 Revision A B C D First Release Update transient response Update transient response Update input range Changes Detail Approval HL HL HL HL RoHS Compliance Complies with the European Directive 2002/95/EC, calling for the elimination of lead and other hazardous substances from electronic products. 2011 Bel Fuse Inc. Specifications subject to change without notice. 092911 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