EV2487DN-00A High voltage White LED Driver Evaluation Board The Future of Analog IC Technology FEATURES DESCRIPTION The EV2487DN-00A is an evaluation board for the MP2487DN, a step down converter designed for driving up to 10 white LEDs in series with 330mA current. The MP2487 is a peak current mode control, fixed frequency regulator to deliver a constant current of up to 1A to high power white LEDs. Its low 200mV feedback voltage reduces power loss and improves efficiency. The wide 4.5V to 55V input range accommodates a variety of step-down applications, making it ideal for automotive, industry and general lighting application. The MP2487 is available in a SOIC8E package. • • • • • • • Wide 4.5V to 55V Operating Input Voltage Drive up to 10 WLEDs in series of 330mA Up to 200kHz programmable Switching Frequency 130µA Quiescent Current Up to 97.5% Efficiency 220mΩ Internal Power MOSFET 200mV reference voltage APPLICATIONS • • • High Power white LED Driver Automotive, Industry and General Lighting Constant Current Source ELECTRICAL SPECIFICATIONS Parameter Input Voltage # of WLEDs LED Current Symbol Value Units VIN 40 – 55 10 ( in series) 330 V ILED mA “MPS” and “The Future of Analog IC Technology” are Registered Trademarks of Monolithic Power Systems, Inc. EV2487DN-00A EVALUATION BOARD EV2487DN-00A MP2487DN (L x W x H) 2” x 1.8” x 0.4” 5.3cm x 4.6cm x 1.0cm Board Number EV2487DN-00A Rev. 0.1 1/26/2010 MPS IC Number www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2010 MPS. All Rights Reserved. 1 EV2487DN-00A – HIGHT VOLTAGE WHITE LED DRIVER EVALUATION BOARD Efficiency vs. Input Voltage 10 WLED@330mA EFFICIENCY(%) 100 98 96 94 92 90 30 35 40 45 50 55 60 INPUT VOLTAGE(V) 05/04, Rev. 1.0 www.MonolithicPower.com 2 EV2487DN-00A – HIGHT VOLTAGE WHITE LED DRIVER EVALUATION BOARD EVALUATION BOARD SCHEMATIC EV2487DN-00A BILL OF MATERIALS Qty Ref Value 1 C8 82pF/50V 1 C1 100nF/50V 1 C9 4.7nF/50V 2 C6,C7 NS 3 C3,C5,C11 0.1µF/100V 1 C10 NS 2 C2,C4 2.2µF/100V 1 D1 1A/90V 1 2 1 1 U1 R2,R10 R8,R9 R6 MP2487DN_LF 0Ω NS 20kΩ 1 R7 487kΩ 1 R1 NS 3 R3,R4,R5 1 L1 EV2487DN-00A Rev. 0.1 1/26/2010 Description Cemaric capacitor,50V,COG Cemaric capacitor,50V,X7R Cemaric capacitor,50V,X7R Package Manufacturer 0603 TDK C1608COG1H820JK 0603 TDK C1608X7R1H104K 0603 TDK C1608X7R1H472K 0805 TDK C2012X7R2A104K 1210 TDK C3225X7R2A225K SMA TDK B190A SOIC8E 0603 MPS Yageo MP2487DN_LF RC0603JR-070RL Film, 1% 0603 Yageo Film, 1% 0603 Yageo RC0603FR-0720KL RC0603FR074878KL 1.82Ω Film, 1% 0805 Yageo 100µH Inductor, 100µH,1.3A, 255mΩ SMD TOKO Cemaric capacitor,100V,X7R Cemaric capacitor,100V,X7R schottky diode 90V, 1A WLED Driver Film, 5% www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2010 MPS. All Rights Reserved. Manufacturer P/N RC0805FR071R82L DS106C2-B966BS101MP3 3 EV2487DN-00A – HIGHT VOLTAGE WHITE LED DRIVER EVALUATION BOARD PRINTED CIRCUIT BOARD LAYOUT Figure 1—Top Layer EV2487DN-00A Rev. 0.1 1/26/2010 Figure 2—Bottom Layer www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2010 MPS. All Rights Reserved. 4 EV2487DN-00A – HIGHT VOLTAGE WHITE LED DRIVER EVALUATION BOARD QUICK START GUIDE 1. Connect the positive and negative terminals of the WLED (10WLED in series) load to the LED+ and LED- pins on the EV board, respectively. 2. Connect the positive and negative terminals of the power supply (40V ~ 55V) to the VIN and GND pins on the EV board, respectively. Turn the power supply on. 3. Drive EN pin high (VEN >1.7V) to enable the MP2487. 4. For PWM dimming mode, apply a PWM signal with high level greater than 1.7V to the EN pin. The typical PWM frequency should be around 200Hz. The WLED brightness can be controlled by the PWM dimming duty cycle. 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. EV2487DN-00A Rev. 0.1 1/26/2010 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2010 MPS. All Rights Reserved. 5