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Step-Down White LED Driver Evaluation Board MPS CONFIDENTIAL AND PROPRIETARY INFORMATION – INTERNAL USE ONLY EVQ2489-Q-00A Rev.1.0 www.MonolithicPower.com 1 9/26/2016 MPS Proprietary Information. Patent Protec ted. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. The Future of Analog IC Technology
DESCRIPTION
The EVQ2489-Q-00A is an evaluation board for the MPQ2489DQ, a step-down converter designed in continuous current mode for driving the high brightness light emitting diodes (LEDs) from wide input voltage 8V-36V. If higher input voltage (up to 60V) is required, use B190 instead of B140 in D1-D5. The MPQ2489 employs hysteretic control architecture to regulate a high accuracy LED current, which is measured through an external high-side current sensing resistor. Moreover, this control scheme provides optimized circuit stabilization and very quick response time without the loop compensation. Its low 200mV average feedback voltage reduces power loss and improves the converter efficiency. The MPQ2489 implements PWM and Analog Dimming with DIM pin. The MPQ2489 includes under-voltage lockout function, thermal overload protection preventing damage in the event of an output overload. ELECTRICAL SPECIFICATIONS Parameter Symbol Value Units Input Voltage V IN 9 –24 V Output Voltage Vout <Vin-3V LED Current I LED 500 mA
FEATURES
Internal 65V MOSFET Wide 8V to 60V Input Range High Efficiency (Up to 94%) Hysteretic Control PWM & 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, halogen 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. EVQ2489-Q-00A EVALUATION BOARD (5x 4.6 x 0.8) cm xcm x cm Board Number MPS IC Number EVQ2489-Q-00A MPQ2489DQ
EVQ2489-Q-00A STEP-DOWN WHITE LED DRIVER EVALUATION BOARD MPS CONFIDENTIAL AND PROPRIETARY INFORMATION – INTERNAL USE ONLY EVQ2489-Q-00A Rev.1.0 www.MonolithicPower.com 2 9/26/2016 MPS Proprietary Information. Patent Protec ted. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. EVALUATION BOARD SCHEMATIC EVQ2489-Q-00A BILL OF MATERIALS Qty Ref Value Description Package Manufacturer Part Number
1 C1 1µF Ceramic Capacitor,25V,X5R 0603 muRata GRM188R61E105KA12D
2 C2, C3 4.7µF Ceramic Capacitor,25V,X5R 0805 muRata GRM21BR61E475KA12L
2 C4, C5 1µF Ceramic Capacitor,16V,X5R 0603 muRata GRM188R61C105KA93D
1 D1 B140 Diode Schottky SMA Diodes Inc. B140
1 L1 10µH Inductor 10µH SMD TDK VLS4012ET-100M-CA
1 L2 68µH Inductor 68µH 5x5mm SMD TDK VLCF5028T-680MR40-2
1 FB1 FB FB 3A/0.05 Ω 0805 Wuth 742 792 023 1 R1 0.4 Ω 1/3W Film Res., 1% 0805 Cyntec RLT1220-F-R400-FNH
1 R2 NC 0805
1 U1 MPQ2489DQ MPS WLED Driver QFN6 MPS MPQ2489DQ
EVQ2489-Q-00A STEP-DOWN WHITE LED DRIVER EVALUATION BOARD MPS CONFIDENTIAL AND PROPRIETARY INFORMATION – INTERNAL USE ONLY EVQ2489-Q-00A Rev.1.0 www.MonolithicPower.com 3 9/26/2016 MPS Proprietary Information. Patent Protec ted. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. EVB TEST RESULTS Performance waveforms are tested on the evaluation board. VIN = 30V, 3 LEDs in series, IOUT = 550mA, unless otherwise noted. -10 10 20 30 40 50 60 0.7 0.8 0.9 1.0 1.1 1.2 1.0 1.1 1.2 1.3 1.4 1.5 0.0 0.2 0.4 0.6 0.8 1.0 150 170 190 210 230 250 -40 -10 20 50 80 110 140 -40 -10 20 50 80 110 140 -40 -10 20 50 80 110 140 -40 -10 20 50 80 110 140 100 10 20 30 40 50 60 0 0.2 0.4 0.6 0.8 1.2 0 0.5 1 1.5 2 2.5 3 0 0.2 0.4 0.6 0.8 1.2 100 200 300 400 500 0 2 04 06 08 0 1 0 0
EVQ2489-Q-00A STEP-DOWN WHITE LED DRIVER EVALUATION BOARD MPS CONFIDENTIAL AND PROPRIETARY INFORMATION – INTERNAL USE ONLY EVQ2489-Q-00A Rev.1.0 www.MonolithicPower.com 4 9/26/2016 MPS Proprietary Information. Patent Protec ted. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. EVB TEST RESULTS (continued) Performance waveforms are tested on the evaluation board. VIN = 30V, 3 LEDs in series, IOUT = 550mA, unless otherwise noted. FREQUENCY IN Hz FREQUENCY IN Hz
EVQ2489-Q-00A STEP-DOWN WHITE LED DRIVER EVALUATION BOARD MPS CONFIDENTIAL AND PROPRIETARY INFORMATION – INTERNAL USE ONLY NOTICE: The information in this document is subject to change wi thout notice. Users should warra nt and guarantee that third party Intellectual Property rights are not infringed upon w hen integrating MPS products into any application. MPS will not assume any legal responsibility for any said applications. EVQ2489-Q-00A Rev. 1.0 www.MonolithicPower.com 6 9/26/2016 MPS Proprietary Information. Patent Protect ed. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. 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. Preset the power supply output to 12V (for 2LED) and turn off the power supply. 3. Connect the positive terminal of the power supply output to the VIN pin and the negative terminal of the power supply output to the GND pin. 4. Turn on the power supply. The EVQ2489 will automatically start up. 5. The LED current is adjustable by set current sense resistor R1//R2.as below formula, R1//R2=200mV/ILED