EV4012DS-00A Boost White LED Driver For TV Backlighting Application The Future of Analog IC Technology DESCRIPTION FEATURES The EV4012DS-00A Evaluation Board is designed to demonstrate the capabilities of MPS’ MP4012DS for TV backlighting applications. MP4012DS is a current mode controller designed for high brightness LEDs. • • • • • • With a 50-90V input VIN and a 12V power supply for MP4012DS, EV4012DS-00A can deliver a regulated voltage to drive a LED string. The LED current is regulated to about 120mA, The EV4012DS-00A can be synchronized, Several EV4012DS-00As can be used together to drive a TV panel. ELECTRICAL SPECIFICATION Parameter Input Voltage IC Power Supply PWM Dimming LED Current Switching Frequency Over Voltage Protection Symbol Value Units VIN 12VIN PWM ILED fs 50-90 12±10% 5±10% 120 100 V V V mA kHz VLED-Max 212 V • • Constant Current WLED Driver High Frequency PWM Dimming Switching Frequency Synchronization Open Load Hiccup Mode Protection Short Load Hiccup Mode Protection Programmable Cycle-by-Cycle Over Current Protection UVLO, Thermal Shutdown Protection Soft Start APPLICATIONS • • TV Backlighting Large LCD Panel 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. Warning: Although this board is designed to satisfy safety requirements, the engineering prototype has not been agency approved. Therefore, all testing should be performed using an isolation transformer to provide the AC input to the prototype board. EV4012DS-00A EVALUATION BOARD Efficiency vs. VIN 97.00 EFFICIENCY (%) 96.00 95.00 94.00 93.00 92.00 91.00 (L x W x H) 7.35cm x 5.84cm x 14mm Board Number MPS IC Number EV4012DS-00A MP4012DS 90.00 50 60 70 VIN (V) EV4012DS-00A Rev.1.01 www.MonolithicPower.com 11/23/2011 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved. 80 90 1 EV4012DS-00A –BOOST WHITE LED DRIVER FOR TV BACKLIGHTING APPLICATION EVALUATION BOARD SCHEMATIC LED+ L1 R3 C2 NC US1G C13 M1 U1 MP4012/SO16 CN1 1 C3 8 D1 7 VIN VIN FB C11 C8 NC VDD ISET R10 C5 4 R1 3 2 1 PWM GATE COMP R12 3k 4 GND PWM R21 953k M2 1k R18 4.3k 14 NC REF R13 9.09k C10 C12 R17 R22 3.32 NC R23 NC R24 NC NC 33nF 220pF 13 R4 A-DIM R2 20.5k SYNC NC 20 R6 1k 3 C15 100nF R14 15 6 12VIN 5 NC R19 C7 2 C14 220pF 16 C4 1nF 5 R5 CS OVP SL FAULT 12 1.58k C6 NC R9 30k 6 7 RT 11 REF 10 R8 560k R16 Fault REF REF C1 LED- D2 R20 21.5k 2k C9 R11 8 SYNC CL 9 21k R7 NC R15 10k EV4012DS-00A BILL OF MATERIALS Qty Ref Value 2 C1, C2 2.2μF 1 C3 0.1μF 1 C4 1nF 4 C5, C6, C14, C15 NC 1 C7 1μF 2 C8, C12 220pF 1 C9 1μF 1 C10 33nF 1 C11 100nF 1 C13 LED+, LED- 1μF/400V 2 Description Ceramic Capacitor;100V;X7R;1210 Ceramic Capacitor;100V;X7R;0805 Ceramic Capacitor;50V;X7R;0603 Ceramic Capacitor;25V;X5R;0805 Ceramic Capacitor;50V;X7R;0603 Ceramic Capacitor;25V;X7R;0603 Ceramic Capacitor;50V;X7R;0603 Ceramic Capacitor;25V;X7R;0603 Film Capacitor;400V; DIP Connector Package Manufacturer 1210 muRata 0805 TDK C2012X7R2A104K 0603 TDK C1608X7R1H102K 0805 muRata GRM216R61E105KA12D 0603 muRata GRM188R71H221KA01D 0603 muRata GRM188R71E105KA12 0603 muRata GRM188R1H333KA61D 0603 muRata GRM188R71H104KA01D DIP Manufacturer P/N GRM32ER72A225KA35L CBB 1μF/400V Connector EV4012DS-00A Rev.1.01 www.MonolithicPower.com 11/23/2011 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved. 2 EV4012DS-00A –BOOST WHITE LED DRIVER FOR TV BACKLIGHTING APPLICATION EV4012DS-00A BILL OF MATERIALS (continued) Qty Ref 1 CN1 1 1 1 1 1 1 1 1 D1 D2 L1 M1 M2 JR1 JR2 JR3 JW1, JW2, JW3, JW4, JW5 R1, R19 R2 R3, R7, R17, R18, R23, R24 R4, R6 R5 R8 R9 R10 R11 R12 R13 R14 R15 R16 R20 R21 R22 U1 5 2 1 6 2 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Value NC US1G 320μH SMK730F SMK0260D 0 0 0 Description CONN/9PIN/2.54MM/ Right angle Diode;400V;1A Inductor;320uH;EFD20 N-MOS;400V;5.5A;1Ω N-MOS;600V;2A;3.9Ω Film Resistor;5% Film Resistor;5% Film Resistor;5% Package Manufacturer Manufacturer P/N CONN/9PIN/2.54MM SMA DIP TO-220 TO-252 0603 1206 0805 MULTICOMP AUK AUK Royalohm Yageo Royalohm JUMP WIRE US1G Inductor SMK730F SMK0260D 0603J0000T5E RC1206JR-070RL 0805S8J0000T5E JUMP WIRE 1k Film Resistor;1% 0603 Yageo RC0603FR-071KL 20.5k Film Resistor;1% 0603 Yageo RC0603FR-0720K5L Sense Resistor;1%;1/2W 1206 CYNTEC RL1632H-R200-FN 0603 0603 0603 0603 0603 0603 0603 0603 0603 0603 0603 1206 1206 SOIC16 Yageo Yageo Yageo Yageo Yageo Yageo Yageo LION Yageo Yageo Yageo Yageo Royalohm RC0603FR-071K58L RC0603FR-07560KL RC0603FR-0730KL RC0603FR-0720RL RC0603FR-0721KL RC0603FR-073KL RC0603FR-079K09L RC0603FR-074K3L RC0603FR-0710KL RC0603FR-075K1L RC0603FR-0723K2L RC0603FR-071ML 1206F330KT5E MP4012DS NC 200m 1.58k 560k 30k 20 21k 3k 9.09k 4.3k 10k 5.1k 23.2k 1M 3.3 MP4012DS Film Resistor;1% Film Resistor;1% Film Resistor;1%; Film Resistor;1%; Film Resistor;1% Film Resistor;1% Film Resistor;1% Film Resistor;1% Film Resistor;1% Film Resistor;1% Film Resistor;1% Film Resistor;1% Resistor;1% MP4012DS EV4012DS-00A Rev.1.01 www.MonolithicPower.com 11/23/2011 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved. 3 EV4012DS-00A –BOOST WHITE LED DRIVER FOR TV BACKLIGHTING APPLICATION EVB TEST RESULTS Performance waveforms are tested on the evaluation board. VIN = 64V, 12VIN=12V, VLED=200V, ILED = 120mA, TA = 20ºC, unless otherwise noted. PWM Dimming Curve Steady State Soft Start 140 120 100 80 60 40 20 0 0 0.2 0.4 0.6 0.8 VDS 100V/div. VDS 100V/div. VCOMP 5V/div. VCOMP 5V/div. VOUT 100V/div. IL 500mA/div. VOUT 100V/div. ILED 100mA/div. 1 PWM DUTY PWM Dimming OVP Recovery Short Load Recovery VDS 100V/div. VDS 100V/div. VDS 100V/div. VPWM 5V/div. VCOMP 5V/div. VCOMP 5V/div. VOUT 100V/div. ILED 100mA/div. VOUT 100V/div. IL 500mA/div. VOUT 100V/div. ILED 100mA/div. EV4012DS-00A Rev.1.01 www.MonolithicPower.com 11/23/2011 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved. 4 EV4012DS-00A –BOOST WHITE LED DRIVER FOR TV BACKLIGHTING APPLICATION PRINTED CIRCUIT BOARD LAYOUT Figure 1—Top Silk Layer Figure 2—Top Layer Figure 3—Bottom Layer EV4012DS-00A Rev.1.01 www.MonolithicPower.com 11/23/2011 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved. 5 EV4012DS-00A –BOOST WHITE LED DRIVER FOR TV BACKLIGHTING APPLICATION QUICK START GUIDE 1. Check the LED string voltage and preset the input voltage power supply to 50-90V. 2. Set a second power supply 12VIN to 12V as the power supply of IC. Set a third power supply to 5V as the PWM input to the EVB. 3. Connect all SYNC pin of all EVBs for synchronization if necessary. 4. Turn-off all power supplies. Connect all the power supply. 5. Connect the anode of the LED string to LED+, and the cathode to LED-. 6. Turn on the VIN power supply. 7. Turn on the 5V PWM power supply. 8. Turn on the 12VIN power supply. The LED string should be lighten 9. To demo the dimming function: replace the 5V PWM power supply with a function generator. Set the PWM signal amplitude to 5V and the frequency within 100Hz to 2kHz 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. EV4012DS-00A Rev.1.01 www.MonolithicPower.com 11/23/2011 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved. 6