EV2480DN-00A Hysteretic Step Down High Power LED Driver The Future of Analog IC Technology DESCRIPTION FEATURES The EV2480DN-00A Evaluation Board is designed to demonstrate the capabilities of MP2480DN. The MP2480 is step-down switching regulator to deliver a constant current of up to 3A for high power LED With a 30-36V input VIN and a EN DC signal which is higher than 2V, EV2480DN-00A can deliver a regulated voltage to drive a LED string. The LED current is regulated to about 2A. ELECTRICAL SPECIFICATION Parameter Symbol Value Units Input Voltage Enable VIN EN 30-36 2- 5 V Dimming DIM 2- 5 LED Current ILED 2 LED Voltage VLED 24 V V A V Wide 5V to 36V Operating Input Range Up to 95% Efficiency Hysteretic Control with No Compensation No Output Capacitor Required ±3% LED Current Accuracy Up to 2MHz Switching Frequency Up to 20kHz Dimming Frequency 200mV Reference Voltage Short-Circuit Protection with Integrated High-Side MOSFET Thermal Shut Down AVAILABLE IN SOIC8-EPAPPLICATIONS High Power LED Driver General Lighting and LCD Backlighting Constant Current Source For MPS green status, please visit MPS website under Quality Assurance. “MPS” and “The Future of Analog IC Technology”, are Registered Trademarks of Monolithic Power Systems, Inc. EV2480DN-00A EVALUATION BOARD (L x W x H) 6.35cm x 6.35cm x 0.8cm Board Number MPS IC Number EV2480DN-00A MP2480DN EV2480DN-00A Rev.1.0 www.MonolithicPower.com 6/20/2011 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved. 1 EV2480DN-00A – HYSTERETIC STEP DOWN HIGH POWER LED DRIVER EVALUATION BOARD SCHEMATIC EV2480DN-00A BILL OF MATERIALS Qty Ref Value Description 1 C1 22µF 2 C2,C3 2.2µF 1 C4 0.1µF Electrolytic Capacitor,50V Ceramic Capacitor,50V,X7R Ceramic Cap., 50V, 10%, X7R 2 1 1 1 1 2 1 1 C5,C6 D1 L1 R1 R2 R3,R4 R5 U1 NC B340 47µH NC 1k 200mΩ 10k MP2480DN Diode Schottky Inductor 2.7A Film Res., 1% Film Res., 1% Film Res., 1% MPS WLED Driver Package Manufacturer DIP 1206 muRata 0603 muRata 1206 SMC SMD 0603 0603 1206 0603 SOIC8-EP Diodes Inc. Wurth Yageo Yageo Yageo MPS Part Number 22µF./50V GRM32ER71H225 KA88L GRM188R71H104K B340 744770147 RC0603FR-071KL RL1206FR-070R2L RC0603FR-0710KL MP2480DN EV2480DN-00A Rev.1.0 www.MonolithicPower.com 6/20/2011 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved. 2 EV2480DN-00A – HYSTERETIC STEP DOWN HIGH POWER LED DRIVER EVB TEST RESULTS Performance waveforms are tested on the evaluation board. VIN = 30V, ILED = 2A, 7 LEDs Load, TA = 25ºC, unless otherwise noted. EV2480DN-00A Rev.1.0 www.MonolithicPower.com 6/20/2011 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved. 3 EV2480DN-00A – HYSTERETIC STEP DOWN HIGH POWER LED DRIVER EVB TEST RESULTS (continued) Performance waveforms are tested on the evaluation board. VIN = 30V, ILED = 2A, 7 LEDs Load, TA = 25ºC, unless otherwise noted. PWM Dimming Short LED+ to LED- Short LED+ to GND fPWM = 200Hz, DPWM = 50% VSW 20V/div. VSW 20V/div. VEN 2V/div. VIN 20V/div. VLED 20V/div. VLED 20V/div. ILED 1A/div. ISHORT 1A/div. VSW 20V/div. ISHORT 1A/div. 2μ s/div. EV2480DN-00A Rev.1.0 www.MonolithicPower.com 6/20/2011 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved. 4 EV2480DN-00A – HYSTERETIC STEP DOWN HIGH POWER LED DRIVER PRINTED CIRCUIT BOARD LAYOUT Figure 1—Top Silk Layer Figure 2—Top Layer Figure 3—Bottom Layer EV2480DN-00A Rev.1.0 www.MonolithicPower.com 6/20/2011 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved. 5 EV2480DN-00A – HYSTERETIC STEP DOWN HIGH POWER LED DRIVER QUICK START GUIDE 1. Check the LED string voltage and preset the input voltage power supply to 30-36V. 2. Set a second power supply to 2- 5V as the power supply for ‘EN’. 3. Turn-off all power supplies. Connect all the power supply. 4. Connect the anode of the LED string to LED+, and the cathode to LED-. 5. Turn on the power supplies. The LED string should be lighten 6. To demo the dimming function: Connect the ‘DIM’ with a function generator. Set the PWM signal amplitude to 2- 5V and the frequency within 100Hz to 20kHz range. NOTICE: The information in this document is subject to change without notice. Please contact MPS for current specifications. 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. EV2480DN-00A Rev.1.0 www.MonolithicPower.com 6/20/2011 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved. 6