VRP4-C0E1A0

NON-ISOLATED DC/DC CONVERTERS 6.0 Vdc - 13.2 Vdc Input, 0.5 Vdc - 1.6 Vdc Output, VRM11.1 Compatible Aug. 13, 2010 Bel Power Inc., a subsidiary of Bel Fuse Inc. RoHS Compliant • • • • VRP4-CxE1A0 Features • • • • • • • Non-Isolated High Efficiency Fixed Frequency Wide Input Remote On/Off Rev.F Input Under-Voltage Lockout OCP/SCP 2-Wire Remote sense 8 bit VID Digital Voltage Programming Class 1, Category 2, Non-Isolated DC/DC Converter (refer to IPC-9592) UL60950-1 Recognized (UL/cUL) (Pending) Applications • • • Networking Computers and peripherals Telecommunications Description The VRP4-CxE1A0 series are non-isolated step down dc/dc converters, and designed to be compatible with Intel VRM11.1 requirements. Standard features include current monitor, remote on/off, over current protection, remote sense, 8 bit VID digital voltage programming and a power good signal. This product also makes use of adaptive positioning to improve transient response performance. These products may be used almost anywhere low-voltage silicon is being employed and a nominal 12 Vdc source is available. Typical applications include file servers, work stations and other computing applications. Part Selection Output Voltage 0.5 Vdc - 1.6 Vdc 0.5 Vdc - 1.6 Vdc 0.5 Vdc - 1.6 Vdc Input Voltage 6.0 Vdc - 13.2 Vdc 6.0 Vdc - 13.2 Vdc 6.0 Vdc - 13.2 Vdc Max. Output Current 100 A 110 A 120 A Max. Output Power 160 W 176 W 192 W Typical Efficiency 83% 81% 82% Model Number Active High VRP4-C0E1A0 VRP4-C1E1A0 VRP4-C2E1A0 Notes: Add “G” suffix at the end of the model number to indicate Tray Packaging. Part Number Explanation V R P4 – Cx E 1A 0 12 3 4 56 7 1---Vertical mount 2---RoHS 6, change “R” to “7” means RoHS 5 3---Series name, SIP 4---Series code 5--- Wide input range (6.0-13.2V) 6---Wide output range (0.5-1.6V) 7---Suffix, active high 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 6.0 Vdc - 13.2 Vdc Input, 0.5 Vdc - 1.6 Vdc Output, VRM11.1 Compatible Aug. 13, 2010 Bel Power Inc., a subsidiary of Bel Fuse Inc. Min -0.3 -0.3 0 -55 Typ Max 15 5.3 70 125 Unit V V °C °C Notes Absolute Maximum Ratings Parameter Continuous non-operating Input Voltage Remote On/Off Ambient Temperature Storage Temperature Note: Ratings used beyond the maximum ratings may cause a reliability degradation of the converter or may permanently damage the device. Input Specifications Parameter Operating Input Voltage Input Current (full load) Input Current (no load) Input Current (no load, PSI# mode) Remote Off Input Current Input Reflected Ripple Current (rms) Input Reflected Ripple Current (pkpk) I t Inrush Current Transient Turn-on Voltage Threshold Turn-off Voltage Threshold 2 Min 6.0 5.8 5.1 Typ 12 50 50 150 6.5 5.6 Max 13.2 35 700 250 70 100 200 1 7.5 6.0 Unit V A mA mA mA mA mA As V V 2 Notes With simulated source impedance of 100nH, 5Hz to 20MHz. Use 2 * 470uF/16V Oscon capacitor. Note: All specifications are typical at 25 °C unless otherwise stated. Output Specifications Parameter Output Voltage Set Point Adaptive Positioning Line Regulation Regulation Over Temperature (0deg.C-70deg.C) Ripple and Noise (pk-pk) Ripple and Noise (rms) Ripple and Noise (pk-pk) under worst case Output Current Range VRP4-C0E1A0 Output Current Range VRP4-C1E1A0 Min 1.07 0 0 Typ 1.085 0.8 ±5 ±5 Max 1.1 ±10 ±10 25 10 30 70 100 90 110 Unit V mOhm mV mV mV mV mV A A A A over all operating input voltage, load and temperature conditions. Thermal Design Current Peak Current Rating Thermal Design Current Peak Current Rating 20MHz BW Notes VID=0x52 Droop Impedance 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 6.0 Vdc - 13.2 Vdc Input, 0.5 Vdc - 1.6 Vdc Output, VRM11.1 Compatible Aug. 13, 2010 Bel Power Inc., a subsidiary of Bel Fuse Inc. Min 0 105 Typ 2.5 Max 100 120 125 135 155 5 5 1 Unit A A A A A As mS % Measured with 6*470uF/5mOhm ESR SP-CAP, and 37*22uF/0805 + 16*47uF/1206 ceramic capacitors on output. Measured with 6*470uF/5mOhm ESR SP-CAP, and 2*1uF/0402 + 2*10uF/0603 + 33*22uF/0805 + 5*22uF/1206 + 10*47uF/1206 ceramic capacitors on output. 2 Output Specifications (continued) Parameter Output Current Range VRP4-C2E1A0 Notes Thermal Design Current Peak Current Rating VRP4-C0E1A0 VRP4-C1E1A0 VRP4-C2E1A0 Output DC Current Limit 115 125 Short Circuit Surge Transient Turn on Time Overshoot at Turn on Output Capacitance (VRP4-C0E1A0) 1 - - 4386 - uF Output Capacitance (VRP4-C2E1A0) 1 - 4148 - uF Transient Response △V50%~100% Overshoot Settling Time Overshoot Settling Time - - 50 25 50 25 mV uS mV uS di/dt=300A/us, Vin=12Vdc, Ta=25°C of Max Load △V100%~50% of Max Load Notes: 1. Consult factory regarding external capacitance outside of this range. 2. All specifications are typical at nominal input, full load at 25°C unless otherwise stated. General Specifications Parameter Efficiency Min 81 79 80 Switching Frequency Over Temperature Alert Over Voltage Protection Weight FIT Dimensions Inches (L × W × H) Millimeters (L × W × H) 2.40 x 1.1 x 0.8 60.96 x 27.94 x 20.2 100 Typ 83 81 82 400 Vo,set + 0.175 42 500 Max 110 Unit % % % kHz °C V g Calculated Per Bell Core SR-332 9 (Io=80%load, Ta = 25 °C, FIT=10 /MTBF) Latch off Notes VID=0x52, Vin=12V, Iout=70A, PSI#=1 VID=0x52, Vin=12V, Iout=100A, PSI#=1 VID=0x52, Vin=12V, Iout=20A, PSI#=0 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 3 NON-ISOLATED DC/DC CONVERTERS 6.0 Vdc - 13.2 Vdc Input, 0.5 Vdc - 1.6 Vdc Output, VRM11.1 Compatible Aug. 13, 2010 Bel Power Inc., a subsidiary of Bel Fuse Inc. Min -0.3 0.9 0 Typ Max 0.4 5.3 1 Unit V V mA Notes The remote on/off pin open, Unit off. Remote On/Off Parameter Signal Low (Unit Off) Signal High (Unit On) Current Sink Active High Efficiency Data 90.00% 85.00% EFFICIENCY 80.00% 75.00% 70.00% 6 5.00% 12.00 30.00 60.00 90.00 120.00 OUTPUT CURRENT(A) Efficiency of VRP4-C2E1A0, Vin=12V, PSI#=1 VID=0x82 VID=0x52 VID=0x02 90.00% 85.00% EFFICIENCY 80.00% 75.00% 70.00% 65.00% 2.00 5.00 10.00 15.00 20.00 VID=0x82 VID=0x52 VID=0x02 OUTPUT CURRENT(A) Efficiency of VRP4-C2E1A0, Vin=12V, PSI#=0 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 6.0 Vdc - 13.2 Vdc Input, 0.5 Vdc - 1.6 Vdc Output, VRM11.1 Compatible Aug. 13, 2010 Bel Power Inc., a subsidiary of Bel Fuse Inc. Thermal Derating Curves Temperature reference points VRP4-C0E1A0 Vin=12V, VID=0x52 VRP4-C2E1A0 Vin=12V, VID=0x52 VRP4-C0E1A0 Vin=12V, VID=0x02 VRP4-C2E1A0 Vin=12V, VID=0x02 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 6.0 Vdc - 13.2 Vdc Input, 0.5 Vdc - 1.6 Vdc Output, VRM11.1 Compatible Aug. 13, 2010 Bel Power Inc., a subsidiary of Bel Fuse Inc. Ripple and Noise Waveforms VRP4-C0E1A0 12Vdc input, VID=0x52, Iout=70A, PSI#=1 VRP4-C2E1A0 12Vdc input, VID=0x52, Iout=100A, PSI#=1 VRP4-C0E1A0 12Vdc input, VID=0x52, Iout=20A, PSI#=0 VRP4-C2E1A0 12Vdc input, VID=0x52, Iout=20A, PSI#=0 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 6.0 Vdc - 13.2 Vdc Input, 0.5 Vdc - 1.6 Vdc Output, VRM11.1 Compatible Aug. 13, 2010 Bel Power Inc., a subsidiary of Bel Fuse Inc. Transient Response Waveforms VRP4-C0E1A0 VID=0x52 25A-75A Load Transients at Vin=12V VRP4-C0E1A0 VID=0x52 75A-25A Load Transients at Vin=12V Startup & Shutdown Rise time Startup time VID=0x52, Vin=12V, Iout=70A VID=0x52, Vin=12V, Iout=0A CH 1: Vout CH 3: OUTEN 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 6.0 Vdc - 13.2 Vdc Input, 0.5 Vdc - 1.6 Vdc Output, VRM11.1 Compatible Aug. 13, 2010 Bel Power Inc., a subsidiary of Bel Fuse Inc. Remote Sense This module has remote sense compensation feature. It can minimize the effects of resistance between module’s output and load in system layout and facilitates accurate voltage regulation at load terminals or other selected point. 1. The remote sense lines carries very little current and hence do not require a large cross-sectional area. 2. This module compensates for a maximum drop of 10% of the nominal output voltage. 3. When using remote sense compensation, all the resistance, parasitic inductance and capacitance of the system are incorporated within the feedback loop of this module. It can make an effect on the module's compensation, affecting the stability and dynamic response. A 0.1uF ceramic capacitor can be connected at the point of load to de-couple noise on the sense wires. 4. Recommend the connection of remote sense compensation as below figure. There are a resistor RS+ (5.11 Kohm) from Vo+ to Sense+ and a resistor RS- (5.11 Kohm)) from Vo- to Sense- inside of this module. Vo+ RS+ Sense+ Load SenseRS- V o- 5. If not using remote sense compensation, please connect sense directly to output at module's pin, that is, connect sense+ to Vo+ and sense- to Vo- at module's pin, the shorter the better. See below figure. V o+ RS+ Sense+ Load SenseRS- Vo- Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com 8 NON-ISOLATED DC/DC CONVERTERS 6.0 Vdc - 13.2 Vdc Input, 0.5 Vdc - 1.6 Vdc Output, VRM11.1 Compatible Aug. 13, 2010 Bel Power Inc., a subsidiary of Bel Fuse Inc. Over Current Protection To provide protection in a fault output overload condition, the module is equipped with internal current-limiting circuitry and can endure current limiting for a few mili-seconds. If the over current condition persists beyond a few milliseconds, the module will shut down into hiccup mode. The module operates normally when the output current goes into specified range. Over Voltage Protection The output over-voltage protection consists of circuitry that monitors the voltage on the output terminals. If the voltage on the output terminals exceeds the over voltage protection threshold the module will shutdown into latch off mode. The over-voltage latch can be reset by either cycling the input power or toggling the on/off signal for one second at least. Input Under-voltage Lockout Input Current Under-voltage Lockout Voltage Falling V1=6.0V V2=7.5V Voltage Rising V1 V2 Input Voltage (V) Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com 9 NON-ISOLATED DC/DC CONVERTERS 6.0 Vdc - 13.2 Vdc Input, 0.5 Vdc - 1.6 Vdc Output, VRM11.1 Compatible Aug. 13, 2010 Bel Power Inc., a subsidiary of Bel Fuse Inc. Power Good 1. This module has a power good indicator output. Power good pin used positive logic and is open collector. 2. Power good pin can sink 10mA. 3. The maximum voltage pulled up externally on Power Good pin should not exceed 5V. 4. When the output reaches the VID setting, the power good pin will be pulled high with the fixed delay of 85us. Typical Start-up Using Remote ON/OFF(Vin=12.0V, VID=0x32, Io=0A) Ch1: Vout Ch2: OUTEN Ch3: VR_READY IMON Diagram IMON is the output pin of sensed, thermally compensated, average current. The voltage at IMON pin is proportional to the load current and the resistor value (RIMON), and internally clamped to 1.11 Vdc plus the remote ground potential difference. If the clamped voltage (1.11 Vdc) is triggered, it will initiate the over-current shutdown. During the dynamic VID, the OCP function of this pin is disabling to avoid falsely triggering. Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com 10 NON-ISOLATED DC/DC CONVERTERS 6.0 Vdc - 13.2 Vdc Input, 0.5 Vdc - 1.6 Vdc Output, VRM11.1 Compatible Aug. 13, 2010 Bel Power Inc., a subsidiary of Bel Fuse Inc. Mechanical Outline Pin 1 2 3 4 5 6 7 8 Function VID0 VID1 VID2 VID3 VID4 VID5 VID6 VID7 Pin 9 10 11 12 13 14 15 16 Function Vsense+ VesnseIMON PSI# OUTEN VR_READY VR_HOT GND Pin 17 18 19 20 21 22 23 24 Function Vout Vout GND GND Vout Vout Vout GND Pin 25 25 27 28 29 30 31 Function GND Vout Vout GND GND Vin Vin 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 11 NON-ISOLATED DC/DC CONVERTERS 6.0 Vdc - 13.2 Vdc Input, 0.5 Vdc - 1.6 Vdc Output, VRM11.1 Compatible Aug. 13, 2010 Bel Power Inc., a subsidiary of Bel Fuse Inc. Signal Definitions VID0, VID1, VID2, VID3, VID4, VID5, VID6, VID7 Vsense+, VsenseLogic level inputs used to set the output voltage refer to VID table. Connect VID0 thru VID7 pins to open-drain outputs with external pull-up resistors or to active-pull-up outputs. Valid logic low is -0.3V to 0.4V, valid logic high level is 0.8V to 5.3V. Remote voltage sense lines. Connect these at the point of load, to VOUT and GND respectively. The output pin of sensed, thermally compensated average current. The voltage at IMON pin is proportional to the load current, and internally clamped to 1.11V plus the remote ground potential difference. If the clamped voltage (1.11V) is triggered, it will initiate the overcurrent shutdown. During the dynamic VID, the OCP function of this pin is disable to avoid falsely triggering. A low input signal indicates the low power mode operation of the processor. The controller drops the number of active phases to single phase operation. A high input signal pulls the controller back to normal operation. Logic level input used to enable the converter when high. Valid logic low is -0.3V to 0.4V, valid logic high level is 0.9V to 5.3V. VR_READY indicates that soft-start has completed and the output voltage is within the regulated range around VID setting. It is an open-drain logic output. When OCP or OVP occurs, VR_READY will be pulled to low. It will also be pulled low if the output voltage is below the undervoltage threshold. VR_HOT is used as an indication of high VR temperature. It will be pulled high if the measured VR temperature is less than a certain level, and pulled low when the measured VR temperature reaches a certain level. Output voltage available to the load. Common return for both input and output Input power to the converter IMON PSI# OUTEN VR_READY VR_HOT Vout GND Vin Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com 12 NON-ISOLATED DC/DC CONVERTERS 6.0 Vdc - 13.2 Vdc Input, 0.5 Vdc - 1.6 Vdc Output, VRM11.1 Compatible Aug. 13, 2010 Bel Power Inc., a subsidiary of Bel Fuse Inc. Vout (VDC) OFF OFF 1.60000 1.59375 1.58750 1.58125 1.57500 1.56875 1.56250 1.55625 1.55000 1.54375 1.53750 1.53125 1.52500 1.51875 1.51250 1.50625 1.50000 1.49375 1.48750 1.48125 1.47500 1.46875 1.46250 1.45625 1.45000 1.44375 1.43750 1.43125 1.42500 1.41875 1.41250 1.40625 1.40000 1.39375 1.38750 1.38125 1.37500 1.36875 1.36250 1.35625 1.35000 1.34375 1.33750 1.33125 1.32500 1.31875 HEX (VID7 - VID0) 3 0 3 1 3 2 3 3 3 4 3 5 3 6 3 7 3 8 3 9 3 A 3 B 3 C 3 D 3 E 3 F 4 0 4 1 4 2 4 3 4 4 4 5 4 6 4 7 4 8 4 9 4 A 4 B 4 C 4 D 4 E 4 F 5 0 5 1 5 2 5 3 5 4 5 5 5 6 5 7 5 8 5 9 5 A 5 B 5 C 5 D 5 E 5 F Vout (VDC) 1.31250 1.30625 1.30000 1.29375 1.28750 1.28125 1.27500 1.26875 1.26250 1.25625 1.25000 1.24375 1.23750 1.23125 1.22500 1.21875 1.21250 1.20625 1.20000 1.19375 1.18750 1.18125 1.17500 1.16875 1.16250 1.15625 1.15000 1.14375 1.13750 1.13125 1.12500 1.11875 1.11250 1.10625 1.10000 1.09375 1.08750 1.08125 1.07500 1.06875 1.06250 1.05625 1.05000 1.04375 1.03750 1.03125 1.02500 1.01875 HEX (VID7 - VID0) 6 0 6 1 6 2 6 3 6 4 6 5 6 6 6 7 6 8 6 9 6 A 6 B 6 C 6 D 6 E 6 F 7 0 7 1 7 2 7 3 7 4 7 5 7 6 7 7 7 8 7 9 7 A 7 B 7 C 7 D 7 E 7 F 8 0 8 1 8 2 8 3 8 4 8 5 8 6 8 7 8 8 8 9 8 A 8 B 8 C 8 D 8 E 8 F Vout (VDC) 1.01250 1.00625 1.00000 0.99375 0.98750 0.98125 0.97500 0.96875 0.96250 0.95625 0.95000 0.94375 0.93750 0.93125 0.92500 0.91875 0.91250 0.90625 0.90000 0.89375 0.88750 0.88125 0.87500 0.86875 0.86250 0.85625 0.85000 0.84375 0.83750 0.83125 0.82500 0.81875 0.81250 0.80625 0.80000 0.79375 0.78750 0.78125 0.77500 0.76875 0.76250 0.75625 0.75000 0.74375 0.73750 0.73125 0.72500 0.71875 HEX (VID7 - VID0) 9 0 9 1 9 2 9 3 9 4 9 5 9 6 9 7 9 8 9 9 9 A 9 B 9 C 9 D 9 E 9 F A 0 A 1 A 2 A 3 A 4 A 5 A 6 A 7 A 8 A 9 A A A B A C A D A E A F B 0 B 1 B 2 F E F F Vout (VDC) 0.71250 0.70625 0.70000 0.69375 0.68750 0.68125 0.67500 0.66875 0.66250 0.65625 0.65000 0.64375 0.63750 0.63125 0.62500 0.61875 0.61250 0.60625 0.60000 0.59375 0.58750 0.58125 0.57500 0.56875 0.56250 0.55625 0.55000 0.54375 0.53750 0.53125 0.52500 0.51875 0.51250 0.50625 0.50000 OFF OFF VID CODES VRM11.1 VID CODES HEX (VID7 - VID0) 0 0 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 9 0 A 0 B 0 C 0 D 0 E 0 F 1 0 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 1 A 1 B 1 C 1 D 1 E 1 F 2 0 2 1 2 2 2 3 2 4 2 5 2 6 2 7 2 8 2 9 2 A 2 B 2 C 2 D 2 E 2 F Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com 13 NON-ISOLATED DC/DC CONVERTERS 6.0 Vdc - 13.2 Vdc Input, 0.5 Vdc - 1.6 Vdc Output, VRM11.1 Compatible Aug. 13, 2010 Bel Power Inc., a subsidiary of Bel Fuse Inc. Revision History Date 2009-04-09 2009-04-22 Revision A B First release 1. Update mechanical drawing; 2. Correct error in part number explanation; 3. Add ripple and start up time waveforms; 4. Remove some “TBD” information. 1. Add efficiency curve; 2. Update NR curves; 3. Add Signal Definitions and VID CODES 1. Adjust input range; 2. Input Specification: 1) add no load input current at PSI# mode, 2) amend the value of full load/no load input current, 3) reflected ripple current, 4) turn on/off threshold voltage; 3. Output Specification: 1) current limit of VRP4-C2E1A0; 2) adjust output capacitance ; 4. General Specification: 1) update efficiency data, 2) add FIT data 5. update efficiency curves, add thermal derating curves, update NR and TR curves, update start up time curve and add rise time curve, add curve for power good; 6. Update mechanical drawing (bottom view and pin spacing). 2010-04-30 2010-08-13 E F 1. Update TD of VRP4-C0E1A0; 2. Update the RS+ and RS- value in Remote sense section. Add the diagram of IMON Jack Fan JZ Wang Changes Detail Approval HL Lu HL Lu 2009-05-05 2010-03-22 C D HL Lu Jack Fan 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. 081310 14 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