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| EV0059 MP1567: Buck Boost Lumileds White LED Driver Monolithic Power Systems General Description The EV0059 evaluation board is designed to drive Lumileds White LEDs using MPS' MP1567 step down converter. The EV0059 circuit is a positive to negative voltage converter with a positive input voltage range of 2.6V to 6V. The generated output voltage can be as low as -18V with respect to ground. The MP1567 is a 2A peak, synchronous step down converter utilizing a constant frequency, current mode switching topology. The MP1567 has internal 180m and 220m MOSFETs and has soft start operation. The MP1567 switches at a high frequency (800KHz) reducing the size of external components. It includes under voltage lockout and over-temperature protection and is available in the tiny 10 pin MSOP and 3mm x 3mm QFN packages. Input Supply Voltage VIN Enable Voltage VEN EVALUATION BOARD Absolute Maximum Ratings 6.5V -0.3V to 6V Recommended Operating Conditions Input Supply Voltage VIN Output Voltage VOUT 2.6V to 6V 0V to -18V Lumileds Emitter Features Highest Flux per LED in the world o Up to 120 lumens Very long operating life (up to100k hours) Superior ESD protection More Energy Efficient than Incandescent and most Halogen lamps Available in White, Green, Blue, Royal Blue, Cyan, Red, Red-Orange, and Amber Ordering Information Board Number EV0059 Luxeon Emitter MP1567 Features 2A Peak Current Limit Internal 180m and 220m Power Switches > 90% efficiency Zero Current Shutdown Mode Under Voltage Lockout Protection Soft Start Operation Thermal Shutdown Internal Current Limit (Source & Sink) MPS Part Number MP1567DK DS25 Figure 1: EV0059 Evaluation Board Applications Handheld Computers, PDAs Cell phones, Digital and Video Cameras Small LCD Display Actual Size: 2.5"X x 2"Y EV0059 Rev 1.2_09/03/03 Monolithic Power Systems, Inc. 1 EV0059 MP1567: Buck Boost Lumileds White LED Driver Monolithic Power Systems Figure 2: EV0059 Schematic TP3 EVALUATION BOARD TP1 TP2 IN BP No Stuff EV0059 Rev 1.2_09/03/03 Monolithic Power Systems, Inc. 2 EV0059 MP1567: Buck Boost Lumileds White LED Driver Monolithic Power Systems Table 1: EV0059 Bill of Materials Component U1 LED1 C1, C3 C2 C4, C5 C6, C7 R1 R2, R3 R4, R5 D1 L1 Part Number MP1567DK Emitter 4.7nF No Stuff 10nF 10F, 10V 5K 1 200K No Stuff 6.2H Vendor Monolithic Power Systems Lumileds Any Any Any Any Any Any Any None Sumida Package MSOP10 DS25 0805 0805 0805 1210 0805 0805 0805 1810 EVALUATION BOARD QTY 1 1 2 0 2 2 1 1 2 0 1 13 CDRH5D18-6R2NC Total Optional POT1 SW1 100K SW_DPDT_B Any Any N/A N/A 1 1 Board Operation 1. Attach input voltage 2.6V VIN 6V and input ground to VIN and GND pins respectively. 2. Turn SW1 to ON position to enable board. Turn SW1 to OFF position to disable board. 3. Turn POT1 clockwise to increase brightness and counterclockwise to decrease brightness. 4. Jumper JP1 can be replaced with a resistor to measure current. EV0059 Rev 1.2_09/03/03 Monolithic Power Systems, Inc. 3 EV0059 MP1567: Buck Boost Lumileds White LED Driver Monolithic Power Systems Figure 3: EV0059 Top Silk Layer EVALUATION BOARD Figure 4: EV0059 Top Layer Figure 5: EV0059 Bottom Silk Layer Figure 6: EV0059 Bottom Silk Layer NOTICE: MPS believes the information in this document to be accurate and reliable. However, it is subject to change without notice. Please contact the factory for current specifications. No responsibility is assumed by MPS for its use or fit to any application, nor for infringement of patent or other rights of third parties. EV0059 Rev 1.2 09/03/03 (c) 2003 MPS, Inc. Monolithic Power Systems, Inc. 983 University Ave, Building D, Los Gatos, CA 95032 USA Tel: 408-395-2802 Fax: 408-395-2812 Web: www.monolithicpower.com 4 |
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