EV3388DR-00A 8 strings White LED Driver Evaluation Board The Future of Analog IC Technology DESCRIPTION FEATURES The EV3388DR-00A is an evaluation board for the MP3388DR, a step-up converter designed for large liquid-crystal displays that employ an array of LEDs as the light source. It can drive up to 8 strings in parallel and 10 LEDs per string. The MP3388 uses internal switch current mode, fixed frequency architecture and includes current ballast in each string terminal, which achieves ±3% current regulation accuracy between strings. Low feedback voltage at each LED string help reduce power loss and improve efficiency. The MP3388 has multiple features to protect the converter from fault conditions, including undervoltage lockout, current limiting, over voltage, short LED, open LED and thermal shut-down protection. APPLICATIONS The MP3388 is available in small QFN24 (4mmx 4mm) package. 4.5V to 25V Input Voltage Range Up to 89% Efficiency Programmable Over Voltage Protection Drives up to 8 Strings Parallel and 10 LEDs in Series. ±3% Current Regulation Accuracy Between Strings Selectable Switching Frequency: 1.25MHz and 625kHz Open and Short LED Load Protection Thermal Shutdown Notebook PC Small LCD TV Handy Terminals Display Automotive Systems and Tablet Computer “MPS” and “The Future of Analog IC Technology” are Registered Trademarks of Monolithic Power Systems, Inc. ELECTRICAL SPECIFICATIONS Parameter Input Voltage Symbol Value Units VIN 4.5 – 25 V 8 strings parallel and 10 LEDs each string LEDs # LED Current ILED 20/string mA EV3388DR-00A EVALUATION BOARD (L x W x H) 10.0cm x 1.0cm x 1.0cm EV3388DR-00A Rev.1.0 12/27/2013 Board Number MPS IC Number EV3388DR-00A MP3388DR www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 1 EV3388DR-00A 8 STRINGS WHITE LED DRIVER EVALUATION BOARD SCHEMATIC EV3388DR-00A Rev.1.0 12/27/2013 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 2 EV3388DR-00A 8 STRINGS WHITE LED DRIVER EV3388DR-00A BILL OF MATERIALS Qty Ref Value 1 C1 4.7µF 2 C2, C4 NC 1 C3 2.2uF 1 C5 NC 1 C6 22nF 1 C7 4.7uF 1 C8 1.8nF 1 C9 68nF 1 C10 100pF 1 D1 1 F1 1 L1 Description Ceramic Capacitor, 50V, X7R Package Manufacturer 1210 Murata Part Number GRM32ER71H475KA88L 1210 Ceramic Capacitor, 50V, X7R 1210 TDK C3225X7R1H225 0603 Ceramic Capacitor, 50V, X7R Ceramic Capacitor, 16V, X5R Ceramic Capacitor, 50V, X7R Ceramic Capacitor, 50V, X7R Ceramic Capacitor, 50V, COG Diode Schottky, 60V, 1A Fuse, 2.5A 0603 Murata GRM188R71H223KA01D 0805 Murata GRM21BR61C475KA88 0603 Murata GRM188R71H182KA01D 0603 Murata GRM188R71H683KA93D 0603 Murata GRM1885C1H101JA01D SMA Diodes Inc DFLS160-F 1206 10µH Inductor,2.47A SMD Cooper 10uH Inductor,2.5A SMD TDK P- channel MOSFET SO8 DR73-100 SLF10145T-100M2R5-H 1 M1 1 R1 324kΩ Resistor, 1% 0603 Yageo RC0603FR-07324KL 1 R2 1kΩ Resistor, 1% 0603 Yageo RC0603FR-071KL 1 R3 10kΩ Resistor, 1% 0603 Yageo RC0603FR-0710KL 2 20kΩ Resistor, 5% 0603 Yageo RC0603JR-0720KL 1 R4,R6 R5, R8, R9 R7 RC0603FR-0760K4L 1 U1 3 EV3388DR-00A Rev.1.0 12/27/2013 NC 60.4kΩ AM4499P 0603 Resistor, 1% 0603 Yageo LED Driver IC QFN24 MPS MP3388DR www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 3 EV3388DR-00A 8 STRINGS WHITE LED DRIVER PRINTED CIRCUIT BOARD LAYOUT Figure 1—Top Layer Figure 2—Bottom Layer QUICK START GUIDE 1. Connect the positive and negative terminals of the load panel (10 white LEDs in series, 8 stings paralleled) to the LED+ and LED1~8 pins on the EV board, respectively. 2. Connect the positive and negative terminals of the power supply (4.5V ~ 25V) to the VIN and GND pins on the EV board, respectively. 3. Drive EN pin high (2.5V < Ven < 5V) to enable the MP3388. 4. For PWM dimming, apply a PWM rectangular waveform with a minimum voltage less than 0.5V and a maximum greater than 2.5V on PWM DIM pin. The frequency of the PWM signal is recommended between 200Hz to 2kHz.and Duty of PWM range from 15% to 100%. 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. EV3388DR-00A Rev. 1.0 12/27/2013 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 4