EV24893DJ-00A Step-Down White LED Driver Evaluation Board DESCRIPTION FEATURES The EV24893DJ-00A is an evaluation board for the MP24893DJ, a step-down converter designed in continuous current mode for driving the high brightness LEDs from wide input voltage of 6V to 30V. The MP24893 employs hysteretic control architecture to regulate a highly accurate LED current, which is measured through an external high-side current-sense resistor. Moreover, this control scheme provides optimal circuit stabilization and a very quick response time without loop compensation. Its low 200mV average feedback voltage reduces power loss and improves the converter efficiency. The MP24893 implements PWM and analog dimming together through the DIM pin. The MP24893 includes under-voltage lockout, thermal overload protection to prevent damage in the event of an output overload. Internal 36V MOSFET Wide 6V-to-30V Input Range High Efficiency Hysteretic Control PWM and Analog Dimming 1000:1 PWM Dimming Resolution UVLO, Thermal Shutdown APPLICATIONS Low-Voltage Halogen Replacement Low-Voltage General Illumination Automotive/Decorative LED Lighting Signs/Emergency Lighting LED Backlighting All MPS parts are lead-free and adhere to the RoHS directive. 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. ELECTRICAL SPECIFICATIONS Parameter Symbol Value Units VIN 6–30 V Output Voltage Vout <Vin-3V LED Current ILED 500 Input Voltage mA EV24893DJ-00A EVALUATION BOARD (2x 1.4 x 1) cm xcm x cm Board Number MPS IC Number EV24893DJ-00A MP24893DJ EV24893DJ-00A Rev.1.1 www.MonolithicPower.com 5/1/2018 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 1 EV24893DJ-00A STEP-DOWN WHITE LED DRIVER EVALUATION BOARD EVALUATION BOARD SCHEMATIC EV24893DJ-00A BILL OF MATERIALS Qty Ref Value 1 C1 2.2µF 1 C2 220µF 1 C3 1nF 2 5 1 1 C4, C5 D1-D5 L1 R1 R2, R3, R4 R5 R6 Q1 U1 NC B260A 100µH 0.4Ω 3 1 1 1 1 Description Ceramic Capacitor, 50V, X7R Electrolytic Capacitor, 35V Ceramic Capacitor, 25V, COG Package Manufacturer 1206 muRata DIP Sanyo 0603 muRata Schottky Diode Inductor 1.3A Resistor, 1% SMA SMD 0805 Diodes Inc. Cooper Royalohm Resistor, 5% 0603 Yageo TSOT23-5 MPS Part Number GRM31CR71H225KA88L 220µF/35V GRM1885C1E102JA01D B260A SD8350-101-R 0805F400LT5E NC 0Ω NC NC MP24893DJ MPS WLED Driver RC0603JR-070RL MP24893DJ-R2 EV24893DJ-00A Rev.1.1 www.MonolithicPower.com 5/1/2018 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 2 EV24893DJ-00A STEP-DOWN WHITE LED DRIVER EVALUATION BOARD PRINTED CIRCUIT BOARD LAYOUT Figure 1—Top Layer Figure 2—Bottom Layer EV24893DJ-00A Rev.1.1 www.MonolithicPower.com 5/1/2018 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 3 EV24893DJ-00A STEP-DOWN WHITE LED DRIVER EVALUATION BOARD QUICK START GUIDE 1. Connect the positive and negative terminals of the load to the LED+ and LED- pins on the EV board, respectively. 2. Connect the positive and negative terminals of the 24V AC power supply to the AC1 and AC2. If apply a DC power supply, please connect + and – to AC1 and AC2. Turn the power supply on. 3. If PWM dimming is required, provide a 200Hz to 2kHz PWM signal to EN /DIM pin. Remove R5 and put a 1kΩ resistor on R4. If analog dimming is required, please open R4 and short R5, then provide a 0.3V-to-2.5V DC voltage to the EN/DIM pin. 4. The LED current is adjustable by set current sense resistor R1//R2 as below formula, R1//R2=202mV/ILED 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. EV24893DJ-00A Rev.1.1 www.MonolithicPower.com 5/1/2018 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 4