EV3202-00A 1.3A Fixed Frequency White LED Driver Evaluation Board The Future of Analog IC Technology DESCRIPTION FEATURES The EV3202-00A is an evaluation board for the MP3202, a step-up converter designed for driving up to 39 white LEDs (13 strings of 3 LEDs each) from a 5V system rail, or 27 white LEDs from 4.5V to 6V. • • • • • The MP3202 uses current mode, fixed frequency architecture to regulate the LED current, which is measured through an external current sense resistor. Its low 104mV feedback voltage reduces power loss and improves efficiency. The OV pin monitors the output voltage and turns off the converter if an over-voltage condition is present due to an open circuit condition. 4.5V to 6V Input Voltage Range Drives up to 27 White LEDs Up to 92% Efficiency Soft-Start/PWM Dimming Fully Assembled and Tested APPLICATIONS • • • • Cell Phones Handheld Computers and PDAs Digital Still Cameras Small LCD Displays “MPS” and “The Future of Analog IC Technology” are Registered Trademarks of Monolithic Power Systems, Inc. The MP3202 includes under-voltage lockout, current limiting and thermal overload protection preventing damage in the event of an output overload. ELECTRICAL SPECIFICATIONS Parameter Input Voltage Number of LEDs Symbol Value Units VIN 4.5 – 6 27 V EV3202-00A EVALUATION BOARD Efficiency vs Input Voltage EFFICIENCY (%) 100 (L x W x H) 3.1” x 1.4” x 0.5” 7.8cm x 3.5cm x 1.2cm Board Number MPS IC Number EV3202-00A MP3202DG EV3202-00A Rev. 1.1 10/18/2007 95 90 IOUT=100mA IOUT=180mA 85 80 4.5 4.7 4.9 5.1 5.3 INPUT VOLTAGE (V) www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2007 MPS. All Rights Reserved. 5.5 1 EV3202-00A – 1.3A FIXED FREQUENCY WHITE LED DRIVER EVALUATION BOARD SCHEMATIC 2 1 GND IN SW 8 D1 1A / 30V MP3202 3 4 NC OV EN GND FB 7 6 5 EV3202-00A BILL OF MATERIALS Qty Ref Value Description 2 C1,C2 2.2µF Ceramic Capacitor, 10V, X5R 2 C3, C4 1µF Ceramic Capacitor, 25V, X7R 1 D1 1 L1 27 LED1 to LED27 1 R1 1 R2 1.1Ω Resistor, 5% 1 R3 1.2Ω Resistor, 5% 1 U1 1 F1 1 CN1 3-Pin Connector Header, 0.100 1 CN2 2-Pin Connector Header, 0.100 EV3202-00A Rev. 1.1 10/18/2007 Diode Schottky, 30V, 1A, 450mW 10µH Inductor, 1.2A White Led, 3.6V, 40 MCD, Not Stuffed 100kΩ Resistor, 5% Fixed Frequency Boot , White Led Driver 1A Fuse Package Manufacturer Part No. Panasonic: ECJ-3YB1A225K TDK: 1206 C3216X7R1E105K/.85 Diodes Inc: SOD-123 B130LAW-7-F Sumida: SMD CDRH6D12-100NC Lumex: SMD SML-LX23UWC-TR Panasonic: 0603 ERJ-3GEYJ104V Panasonic: 0603 ERJ-3GEYJ1R1V Panasonic: 0603 ERJ-3GEYJ1R2V MPS: 2x2 QFN8 MP3202DG 1206 1206 Sullins: PTC03SAAN Sullins: PTC02SAAN www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2007 MPS. All Rights Reserved. 2 EV3202-00A – 1.3A FIXED FREQUENCY WHITE LED DRIVER PRINTED CIRCUIT BOARD LAYOUT Figure 1—Top Silk Layer Figure 2—Top Layer Figure 3—Bottom Layer EV3202-00A Rev. 1.1 10/18/2007 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2007 MPS. All Rights Reserved. 3 EV3202-00A – 1.3A FIXED FREQUENCY WHITE LED DRIVER QUICK START GUIDE 1. Solder LED1 – LED27 to board. 2. Connect the positive and negative terminals of the power supply (4.5V to 6V) to the VIN and GND pins, respectively. 3. This board is set up for automatic startup. Pull EN low to shut down the MP3202. 4. To use burst mode brightness control, drive EN with a PWM signal. NOTICE: The information in this document is subject to change without notice. Users should warrant and guarantee that third party Intellectual Property rights are not infringed upon when integrating MPS products into any application. MPS will not assume any legal responsibility for any said applications. EV3202-00A Rev. 1.1 10/18/2007 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2007 MPS. All Rights Reserved. 4