EV2341-TL-00A

EV2341-TL-00A High-Efficiency, Synchronous Step-Down LED Driver Evaluation Board DESCRIPTION FEATURES The EV2341-TL-00A Evaluation Board is designed to demonstrate the capabilities of MP2341GTL. The MP2341 is a 24V monolithic synchronous step-down white LED driver with a built-in power MOSFET and rectifier. It achieves up to 2A continue output current with excellent load and line regulation in a tiny SOT583 package. Peak current mode operation provides fast transient response and eases loop stabilization.   The EV2341-TL-00A is typically designed for driving 2 WLEDs in series (5.9VTYP) LED load with 2A current at wide 8V to 24V input range. The EV2341-TL-00A has high performances in efficiency, line/load regulation, deep dimming range with both analog and PWM mode. Fault condition protection includes cycle-by-cycle peak current limiting, output short circuit protection, open LED protection and thermal shutdown. ELECTRICAL SPECIFICATION Parameter Input Voltage Output Voltage LED Current Symbol Value Units VIN VOUT ILED 8 to 24 5.9 2 V V A             8V to 24V Wide Input Range 125mΩ/75mΩ Low-RDS(ON) Internal Power MOSFETs 100mV Feedback Voltage Up to 95% Efficiency Fixed 1MHz Switching Frequency Analog Dimming by DC voltage through EN/DIM Analog Dimming by PWM signal through PDIM PWM Dimming by PWM signal through EN/DIM 50:1 Dimming Ratio by Analog Dimming 1000:1 Dimming Ratio by PWM Dimming LED Open Protection Over-Current Protection and Hiccup Over Voltage Protection with Auto Recovery Thermal Shutdown APPLICATIONS     Infrared LED Driver General LED Driver Flashlight Handheld Computers Backlight 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. EV2341-TL-00A EVALUATION BOARD Efficiency vs. VIN 2 WLEDs in series, VOUT=5.9V, L = 6.5μH, ILED=2A 100 EFFICIENCY (%) 95 (L x W x H) 46mm x 46mm x 6mm Board Number MPS IC Number EV2341-TL-00A 90 85 80 8 10 12 14 16 18 20 22 24 INPUT VOLTAGE (V) MP2341GTL EV2341-TL-00A Rev. 1.0 www.MonolithicPower.com 5/24/2018 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 1 EV2341-TL-00A – HIGH-EFFICIENCY, SYNCHRONOUS STEP-DOWN LED DRIVER EVALUATION BOARD EVALUATION BOARD SCHEMATIC EV2341-TL-00A BILL OF MATERIALS 0805 Manufactur er Murata 0603 Murata GRM188R71H104KA93D 0805 Murata GRM21BR61C106KE15L 0603 Murata GRM188R71C104KA01D 0603 Murata GRM188R71C105KE15D Sense resistor, 1W 1206 YAGEO PE1206FRF470R05L 1KΩ Film Res,1%,0603,1K 0603 YAGEO RC0603FR-071KL 0Ω Film Res,1%,0603,0R 0603 YAGEO RC0603JR-070RL 7x7x5mm Wurth 6x6x4.5mm Sunlord SOT583 MPS Qty Ref Value 2 C1, C1B 10μF 1 C1A 0.1μF 0 C2A NS 1 C2 10μF 1 C3 0.1μF 1 C4 1μF 1 R1 50mΩ 0 R2 NS 1 R3 1 R4 1 1 Description Ceramic Cap., 35V,X5R Ceramic Cap., 50V,X7R Ceramic Cap., 16V,X5R Ceramic Cap., 16V,X7R Ceramic Cap., 16V,X7R 6.5μH Inductor, RDC=21.5mΩ, Isat=6A 6.8μH Inductor, RDC=31mΩ, Isat=4.3A Package Manufacturer _P/N GRM21BR61E106KA43L 744314650 L1 U1 MP2341 24V, 2A LED driver SWPA6045S6R8MT MP2341GTL EV2341-TL-00A Rev. 1.0 www.MonolithicPower.com 5/24/2018 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 2 EV2341-TL-00A – HIGH-EFFICIENCY, SYNCHRONOUS STEP-DOWN LED DRIVER EVALUATION BOARD EVB TEST RESULTS Performance waveforms are tested on the evaluation board. VIN = 12V, 2 WLEDs in series, VOUT=5.9V, L = 6.5µH, TA = +25°C, unless otherwise noted. Efficiency vs. VIN Analog Dimming Curve VOUT=5.9V Ramp up/down EN/DIM voltage DIMMING SCALE (%) 100 EFFICIENCY (%) 95 90 85 80 8 10 12 14 16 18 20 22 100 90 80 70 60 50 40 30 20 10 0 VDIM Falling VDIM Rising 0.6 24 INPUT VOLTAGE (V) DIMMING SCALE (%) DIMMING SCALE (%) 1.4 1.6 EN/DIM frequency=200Hz PDIM frequency=20kHz 40 1.2 VDIM ANALOG LEVEL (V) 100 90 80 70 60 50 40 30 20 10 0 20 1 PWM Dimming Curve Analog Dimming Curve 0 0.8 60 80 100 PDIM ANALOG DIMMING DUTY (%) 100 90 80 70 60 50 40 30 20 10 0 0 20 40 60 PWM DUTY (%) 80 100 Thermal Test VOUT=5.9V CASE TEMPERATURE RISE (˚C) 40 Vin=12V Vin=19V Vin=24V 35 30 25 20 15 10 5 0 0 0.5 1 1.5 LED CURRENT (A) 2 EV2341-TL-00A Rev. 1.0 www.MonolithicPower.com 5/24/2018 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 3 EV2341-TL-00A – HIGH-EFFICIENCY, SYNCHRONOUS STEP-DOWN LED DRIVER EVALUATION BOARD EVB TEST RESULTS (continued) Performance waveforms are tested on the evaluation board. VIN = 12V, 2 WLEDs in series, VOUT=5.9V, L = 6.5µH, TA = +25°C, unless otherwise noted. Steady State VIN Start-Up CH1: IL 1A/div. CH4: ILED 1A/div. CH1: IL 1A/div. CH4: ILED 1A/div. CH2: VIN 5V/div. CH2: VIN 5V/div. CH3: VSW 5V/div. CH3: VSW 5V/div. 1μs/div. 1ms/div. VIN Shutdown EN Start-Up CH1: IL 1A/div. CH4: ILED 1A/div. CH1: IL 1A/div. CH4: ILED 1A/div. CH2: CH2: VIN 5V/div. VEN/DIM 2V/div. CH3: VSW 5V/div. CH3: VSW 10V/div. 1ms/div. 500μs/div. EN Shutdown Minimum Analog Dimming VPDIM=2V, Frequency=20kHz, Duty=0.63%, VFB=1mV CH1: IL 1A/div. CH4: ILED 1A/div. CH1: IL 500mA/div. CH4: ILED 50mA/div. CH2: VEN/DIM 2V/div. CH2: VPDIM 2V/div. CH3: VSW 10V/div. CH3: VSW 10V/div. 2μs/div. 10μs/div. EV2341-TL-00A Rev. 1.0 www.MonolithicPower.com 5/24/2018 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 4 EV2341-TL-00A – HIGH-EFFICIENCY, SYNCHRONOUS STEP-DOWN LED DRIVER EVALUATION BOARD EVB TEST RESULTS (continued) Performance waveforms are tested on the evaluation board. VIN = 12V, 2 WLEDs in series, VOUT=5.9V, L = 6.5µH, TA = +25°C, unless otherwise noted. PWM Dimming Open LED protection VEN/DIM=2V, Frequency=1kHz, Duty=50% CH1: IL 200mA/div. CH4: VOUT 5V/div. CH1: IL 2A/div. CH4: ILED 2A/div. CH2: VEN/DIM 2V/div. CH2: VIN 5V/div. CH3: VSW 10V/div. CH3: VSW 5V/div. 500μs/div. 1μs/div. Short LED+ to LED- Protection CH1: IL 1A/div. Short LED+ to GND protection CH1: IL 1A/div. CH2: VFB 50mV/div. CH3: VSW 5V/div. CH3: VSW 5V/div. 20µs/div. 2ms/div. EV2341-TL-00A Rev. 1.0 www.MonolithicPower.com 5/24/2018 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 5 EV2341-TL-00A – HIGH-EFFICIENCY, SYNCHRONOUS STEP-DOWN LED DRIVER EVALUATION BOARD PRINTED CIRCUIT BOARD LAYOUT Figure 1 - Top Silk Layer Figure 2 - Top Layer Figure 3 - Bottom Layer EV2341-TL-00A Rev. 1.0 www.MonolithicPower.com 5/24/2018 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 6 EV2341-TL-00A – HIGH-EFFICIENCY, SYNCHRONOUS STEP-DOWN LED DRIVER EVALUATION BOARD QUICK START GUIDE 1. Preset DC Power Supply output to 8V to 24V and turn off Power Supply. 2. Connect the positive terminal of Power Supply output to the VIN pin and the negative terminal to the GND pin. 3. Connect the LED load between “LED+” (anode of LED string) and “LED-“(cathode of LED string). 4. Turn on Power Supply. The EV2341-TL-00A will automatically startup. 5. To use the Enable function, apply the Enable voltage to the EN/DIM pin and drive Enable high to turn on the chip. When Enable voltage is less than 0.27V, the chip is turned off. 6. There are two ways to apply analog dimming. One is connecting a variable DC signal (0.7V to 1.44V) to EN/DIM pin and GND pins, respectively. By adjusting the voltage level from 0.7V to 1.44V, the LED current changes from the min scale to full scale of the maximum LED current. If the dimming voltage is higher than 1.57V, the maximum LED current is generated. Another analog dimming way is connecting the PWM signal to PDIM pin and GND pins, respectively. Recommend to set dimming frequency higher than 10kHz, and the positive plateau should be higher than 1.5V, the negative plateau should be lower than 0.4V. 7. To apply PWM dimming, connect the PWM signal (the positive plateau should be higher than 1.57V, the negative plateau should be lower than 0.27V) to EN/DIM and GND pins, respectively. The dimming frequency is recommended to be in the range of 100Hz to 2kHz to achieve good dimming linearity. 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. EV2341-TL-00A Rev. 1.0 www.MonolithicPower.com 5/24/2018 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 7