SP6137LED Evaluation Board Manual Ideal for Automotive or 12V Bus Application Single Board for 1W, 3W and 5W Applications High Efficiency Small 10-Pin MSOP Package 900kHz Switching Frequency Enables Small Components Integrated Design with Minimal Components. Dual MOSFET for Spacing Saving DESCRIPTION AND BOARD SCHEMATIC The SP6137LED Evaluation Board is designed to help the user evaluate the performance of the SP6137 for use as a Luxeon 1W/3W/5W Driver. The evaluation board is a completely assembled and tested surface mount board which provides easy probe access points to all SP6137 inputs and outputs so that the user can quickly connect and measure electrical characteristics and waveforms. VIN 12V 1 1 1 1 R6 499 VCC 5.1V 1/4W, 1206 C1 1uF 16V, 0805 D1 BZT52C5V1S 5.1V, SOD-323 R2 24.3K 0603 1 1 C2 10uF 6.3V 0805 1 6 7 VSS 5 R4 1k 0603 4 C4 1uF 10V 0603 U1 SP6137 VCC BST UVIN GH SS COMP SWN GND VFB GL D2 MBR0530 SOD-123 U2 10 9 8 2 Si5902DC 8 C3 1uF 1 10V, 0603 2 7 6 3 5 4 1 L1 4.7uH 2 SD43-4R7M D3 1W/3W/5W J1 setup: J1 no hat: J1 at 1&2: J1 at 2&3 R1,R3,R5: J1 1W LumiLED 5W LumiLED 3W LumiLED 1206, 1%, SMD 2 SP6137LED Evaluation Board Manual 1 VOUT 1 C5 1uF 16V, 0805 3 200mV Rev 12/05/03 1 1 1 VFB 1 R5 0.56 2 R1 0.56 3 R3 0.33 Copyright 2003 Sipex Corporation USING THE EVALUATION BOARD 1) Powering Up the SP6137LED Circuit The SP6137LED Evaluation Board can be powered from a 12V power supply or from 8 alkaline cells. Connect with short leads directly to the “VIN” and “GND” posts. Plug the 1W/3W/5W Luxeon LumiLED between the “VOUT” and “VFB” posts. Refer to section 2 for Jumper (J1) setup for different LumiLED applications. 2) Using the J1 Jumper for different LumiLED Applications The SP6137LED Evaluation Board can be used to drive 1W, 3W or 5W LumiLED respectively, this can be done by using the J1 Jumper. When no hat was used for the J1, it is setup for 1W application. When the hat is put on 1 & 2 position, it is used for 5W application. When the hat is put on 2 & 3 position, it is used for 3W application. 3) Selecting the Bias Resistor The feedback voltage was programmed to be 200mV by using two divider resistors (R2 and R4) at the soft start pin. (The internal 0.8V reference was overwritten by the programmed 0.2V to reduce the sense voltage and increase the efficiency). The bias resistor is used to set the operating current of the LumiLED as equation V Rb = FB IF where VFB is set as 200mV, IF is the operating current of the LumiLED. For 1W application, IF=350mA, Rb=R1=0.56Ohm For 5W application, IF=700mA, Rb=R1//R5=0.28Ohm For 3W application, IF=1000mA, Rb=R1//R3=0.2Ohm POWER SUPPLY DATA For the standard evaluation board, the following chart shows the efficiency data for different applications. 100 98 96 Efficiency (%) 94 92 1W 3W 5W 90 88 86 84 82 80 78 Single Two Three Fig. 1 Efficiency data of the SP6137LED evaluation board 2 EVALUATION BOARD LAYOUT FIGURE 1: SP6137LEDEB COMPONENT PLACEMENT FIGURE 2: SP6137LEDEB PC LAYOUT TOP SIDE FIGURE 3: SP6137LEDEB PC LAYOUT BOTTOM SIDE 3 TABLE1: SP6137LEDEB LIST OF MATERIALS Ref. Des. Qty. U1 U2 C1, C5 C2 C3, C4 L1 D1 D2 D3 R1, R5 R3 R2 R4 R6 R7 J1 1 1 2 1 2 1 1 1 1 2 1 1 1 1 1 1 SP6137 Buck for LumiLED List of Materials Manufacturer Part Number Layout Size LxWxH Sipex Corp. SP6137 MSOP-10 Vishay Si5902DC 1206-8 ChipFET TDK Corp C2012X5R1C105K 805 TDK Corp C2012X5R0J106M 805 TDK Corp C1608X5R1A105K 603 Easy Magentic SD43-4R7M 4X4.5X3.2 ON Semin MBR0530 SOD-123 Diodes Inc. BZT52C5V1S SOD-323 LumiLEDs Panasonic 1206 Panasonic 1206 Panasonic 603 Panasonic 603 Panasonic 1206 Panasonic 603 Component Vendor 900kHz Dual Supply Synchronous Buck Dual N-Channel 30V MOSFET 1uF/16V/X5R/10% Ceramic 10uF/6.3V/X5R/ Ceramic 1uF/10V/X5R/ Ceramic 4.7uH 2.43A 0.1 Ohm SM Inductor 0.5A Schottky 5.1V SMD zener diode Open 0.56 Ohm 1/4W 1% 1206 SM 0.33 Ohm 1/4W 1% 1206 SM 24.3K Ohm 1/16W 1% 0603 SM 1K Ohm 1/16W 1% 0603 SM 499 Ohm 1/4W 5% 1206 SM 5 Ohm 1/16W 1% 0603 SM 3-Pin Jumper Sipex 978-667-8700 Vishay TDK 847-803-6100 TDK 847-803-6100 TDK 847-803-6100 Easy Magnetic 800-388-8731 Diodes Inc. LumiLEDs 800-Digi-Key 800-Digi-Key 800-Digi-Key 800-Digi-Key 800-Digi-Key 800-Digi-Key 800-Digi-Key ORDERING INFORMATION Model Temperature Range Package Type SP6137LEDEB............................. -40°C to +85°C...................SP6137LED Evaluation Board SP6137EU.....................................-40°C to +85°C...................................... 10-pin µSOIC 4