NON-ISOLATED DC/DC CONVERTERS 12 Vdc Input Vddq/2 / 8 A Output Bel Power Inc., a subsidiary of Bel Fuse Inc. Nov. 10, 2010 VRAF-08AT5E RoHS Compliant Rev.A Features • Non-Isolated • Under-Voltage Lockout • High Efficiency • Output Enable • Fixed Frequency • OCP/SCP • Current Source/Sink Capability • Low Cost • Tracking a Reference for Output Voltage • High Power Density • Over Voltage Protection (Hiccup Mode) • Class 1, Category 2, Non-Isolated DC/DC Converter (refer to IPC-9592) Applications • Networking • Computers and peripherals • Telecommunications Description The Bel VRAF-08AT5E 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 Vdc 5.0 Vdc - 13.8 Vdc Max. Output Current 8A Max. Output Power 7.2 W Typical Efficiency 69% Model Number VRAF-08AT5E Notes: Add “G” suffix at the end of the model number to indicate Tray Packaging. Part Number Explanation V R AF – 08 A T5 E 1 2 3 4 5 6 7 1---Vertical mount 2---RoHS 6, change “R” to “7” means RoHS 5 3---Series name (SIP) 4---Series code (output current 8A) 5---Input range (5.0-13.8V) 6---Output voltage (Vddq/2) 7---Suffix Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com 1 NON-ISOLATED DC/DC CONVERTERS 12 Vdc Input Vddq/2 / 8 A Output Bel Power Inc., a subsidiary of Bel Fuse Inc. Nov. 10, 2010 Absolute Maximum Ratings Min Typ Max Unit Input Supply Voltage -0.5 - 15 V Input Signal Voltage -0.3 - 5.25 V 0 - 70 °C -40 - 85 °C Parameter Operating Temperature Storage Temperature Notes Note: All specifications are typical at 25 °C unless otherwise stated. Input Specifications Parameter Operating Input Voltage Min 5.0 Typ 12 Max 13.8 Unit V Input Current (full load) - - 2.2 A Input Current (no load) - 25 35 mA 1.2 1.8 2.0 V Remote Off Input Current - 7 10 mA Input Reflected Ripple Current (pk-pk) - 110 180 mA Input Reflected Ripple Current (rms) - 25 60 mA I t Inrush Current Transient - 0.006 0.012 As Turn-on Voltage Threshold 2.6 - 3.9 V Turn-off Voltage Threshold 2.4 - 3.7 V Reference Voltage Range (Vddq) 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 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 Min Typ Max Unit - Vddq/2 - V -1.5 - 1.5 % Load Regulation - 3 6 mV Line Regulation - 3 6 mV Output Current 0 - 8 A 9.2 - 14 A Output Ripple and Noise (pk-pk) - 25 50 mV Output Ripple and Noise (rms) - 8 15 mV Short Circuit Surge Transient - 1.1 2.2 As Turn on Time - 2.5 5 mS Output Voltage Set Point Tracking Tolerance (Vddq/2-Vout)/Vout Output DC Current Limit 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 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 2 NON-ISOLATED DC/DC CONVERTERS 12 Vdc Input Vddq/2 / 8 A Output Bel Power Inc., a subsidiary of Bel Fuse Inc. Nov. 10, 2010 Output Specifications (continued) Parameter Min Typ Max Unit Overshoot at Turn on - 0 3 % Output Capacitance 0 - 2200 uF Notes Transient Response △V50%~100% Overshoot - 100 200 mV of Max Load Settling Time - 20 50 uS △V100%~50% Overshoot - 100 200 mV of Max Load Settling Time - 20 50 uS di/dt=0.3 A/uS; VO =0.9 V; 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=8 A, Ta= 25°C unless otherwise stated. General Specifications Min Typ Max Unit Efficiency Parameter 68 69 - % Switching Frequency 260 300 340 kHz - 2.5 - g Weight MTBF 6,416,286 hours 0.65 x 0.41 x 0.40 16.51 x 10.41 x 10.16 - 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) Dimensions Inches (L × W × H) Millimeters (L × W × H) Note: All specifications are typical at 25 °C unless otherwise stated. Control Specifications Parameter Output Enable Min Typ Max Unit ENABLE High 2 - 5.5 V ENABLE Low 0 - 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 3 NON-ISOLATED DC/DC CONVERTERS 12 Vdc Input Vddq/2 / 8 A Output Bel Power Inc., a subsidiary of Bel Fuse Inc. Nov. 10, 2010 Efficiency Data Efficiency Efficiency Curve 85.0% 80.0% 75.0% 70.0% 65.0% 60.0% 55.0% 50.0% 45.0% 10.8 V 12.0 V 13.2 V 0.8 2.0 4.0 6.0 8.0 Output Current (A) Thermal Derating Curves Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com 4 NON-ISOLATED DC/DC CONVERTERS 12 Vdc Input Vddq/2 / 8 A Output Bel Power Inc., a subsidiary of Bel Fuse Inc. Nov. 10, 2010 Thermal Derating Curve (continued) 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 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. Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com 5 NON-ISOLATED DC/DC CONVERTERS 12 Vdc Input Vddq/2 / 8 A Output Bel Power Inc., a subsidiary of Bel Fuse Inc. Nov. 10, 2010 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. 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 6 NON-ISOLATED DC/DC CONVERTERS 12 Vdc Input Vddq/2 / 8 A Output Nov. 10, 2010 Bel Power Inc., a subsidiary of Bel Fuse Inc. Mechanical Outline Pin Connections Pin Function 1 Vin 2 Vddq 3 Vout (Vtt) 4 GND 5 Enable Note: This module is recommended and compatible with Pb-Free Wave Soldering and must be soldered using a peak solder temperature of no more than 260 ºC for less than 5 seconds. Note: 1) All Pins: Material - Copper Alloy; Finish – 3 micro inches minimum Gold over 50 micro inches minimum Nickel plate. 2) Undimensioned components are shown for visual reference only. 3) All dimensions in inches (mm); Tolerances: x.xx +/-0.02 in. (x.x +/-0.5mm) x.xxx +/-0.010 in. (x.xx +/-0.25mm). Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com 7 NON-ISOLATED DC/DC CONVERTERS 12 Vdc Input Vddq/2 / 8 A Output Bel Power Inc., a subsidiary of Bel Fuse Inc. Nov. 10, 2010 Revision History Date Revision 2010-11-10 A Changes Detail Approval First release HL Lu RoHS Compliance Complies with the European Directive 2002/95/EC, calling for the elimination of lead and other hazardous substances from electronic products. ©2010 Bel Fuse Inc. Specifications subject to change without notice. 111010 8 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