EV3378E-F-00A 4-Channel WLED Controller With High-Efficiency Buck Converter Evalution Board The Future of Analog IC Technology PRELIMINARY SPECIFICATIONS SUBJECT TO CHANGE DESCRIPTION FEATURES The MP3378E is a one-chip solution specially designed for monitor applications. The MP3378E includes a step-up WLED controller with four current channels for backlighting, and a high efficiency buck converter for internal bus voltage or standby power. WLED Driver: • 4-String, Max 350mA/String, WLED Controller • Up to 24V Input Voltage Range • 2.5% Current Matching Accuracy • Programmable Switching Frequency • PWM and Analog Dimming Mode • LED Open and Short Protection • Programmable Over-Voltage Protection • Recoverable Thermal Shutdown Protection • Over-Current Protection • Over-Temperature Protection • Inductor/Diode short Protection Buck Converter: • 144mΩ/58mΩ Low RDS(on) Internal Power MOSFETs • Low Quiescent Current • Fixed 235kHz Switching Frequency • Frequency Sync from 250kHz to 2MHz External Clock • Internal Soft Start • OCP and Hiccup Mode • Over-Temperature Protection • Output Adjustable from 0.8V The 4-string WLED controller drives an external MOSFET to boost up the output voltage from the input supply. It regulates the current in each LED string to the programmed value set by an external current setting resistor. It supports both analog and PWM dimming independently to meet special dimming mode request. Full protection features for the WLED controller include OCP, OTP, UVP, OVP, LED short/open protection, inductor/diode short protection. The high-efficiency buck converter operates in the current mode operation with a built-in MOSFET and a built-in synchronous rectifier. It offers a very compact solution to achieve excellent load and line regulation. Full protection features for the buck converter include OCP and thermal shutdown. The MP3378E is available in a TSSOP-28EP package. ELECTRICAL SPECIFICATIONS Parameter Symbol Value Units Input Voltage VIN 8– 24 V 4 LED strings 10 LEDs/string LEDs # APPLICATIONS • • • Desktop LCD Flat Panel Displays Flat Panel Video Displays 2D/3D LCD TVs and Monitors All MPS parts are lead-free and adhere to the RoHS directive. For MPS green status, please visit MPS website under Products, Quality Assurance page. “MPS” and “The Future of Analog IC Technology” are registered trademarks of Monolithic Power Systems, Inc. LED Current ILED 120/string mA IOUT Current (buck) IOUT 2 A EV3378E-F-00A Rev.1.0 www.MonolithicPower.com 2/17/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. Preliminary Specifications Subject to Change © 2016 MPS. All Rights Reserved. 1 EV3378E-F-00A – 4-CHANNEL WLED DRIVER WITH BUCK CONVERTER PRELIMINARY SPECIFICATIONS SUBJECT TO CHANGE EV3378E-F-00A EVALUATION BOARD (L x W x H) 5.9cm x 8.4cm x 2cm Board Number MPS IC Number EV3378E-F-00A MP3378EGF EVALUATION BOARD SCHEMATIC 8V-24V VIN 1 1 F1 L1 33uH/3.2A C4 C5 C1 4.7uF NC 220uF R32 2 1 D1 2 1 0 M1 100V/4A R3 10 IN GND1 GND1 GND1 C9 470nF C10 GND2 EN1 1 R20 2K NC C23 NC IN 27 R10 R11 100K GND1 2 226K GND1 C12 R14 NC 100K 4 28 3 PWM-DIM R16 2K 1 C13 26 GND1 NC 1 25 R7 470nF 270 R8 2K C11 A-DIM GND1 R18 100K GND1 C16A NC 15 R17 C15 8.45K NC 21 C18 100nF GND1 C16 C17 22uF 100nF 14 13 18 GND2 17 Gate GND2 EN2 1 R5 U1 24 GND1 GND2 R22 1K GATE VCC1 ISENSE COMP GND1 OVP MP3378ELED1 OSC ADIM LED2 PWM LED3 ISET LED4 VIN2 5, 6, 7, 8 BST SYNC SW VCC2 FB EN2 NC GND2 NC GND2 AGND 23 1, 2, 3 GND1 R19 0 9 NC GND1 GND1 R9 0 R13 0 R15 0 R25 47 C20 100nF R26 51K L2 10uH C21A 22uF R31 604 10 GND2 C19 NC 19 100K 5V/2A 1 Vout 1 GND2 GND2 GND2 R28 7.68K R30 R24 2K C21 C21B 22uF 22uF C22 15pF R29 0 R27 40.2K GND2 R23 10K LED1 LED2 LED3 LED4 R12 0 5 11 1 R21 2K 6 12 1 C8 100pF GND1 7 16 1 GND1 R4 10K C14 8 20 C3 R2 C2 2.2uF 357K 2.2uF C6 22uF/100V 1 R6 50m 22 1 C7 NC 10 VIN1 EN1 NC 4 Gate 1 R1 12S 4P 120mA/string 1 LED 2 GND2 GND2 EV3378E-F-00A Rev.1.0 www.MonolithicPower.com 2/17/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. Preliminary Specifications Subject to Change © 2016 MPS. All Rights Reserved. 2 EV3378E-F-00A – 4-CHANNEL WLED DRIVER WITH BUCK CONVERTER PRELIMINARY SPECIFICATIONS SUBJECT TO CHANGE EV3378E-F-00A BILL OF MATERIALS Qty Ref Value 1 C1 220μF 2 C2, C3 2.2μF 1 C4 4.7μF 1 C6 22μF /100V 1 C8 100pF 1 C9 470nF 1 C10 470nF 1 C16 22μF 3 3 C17, C18, C20 C21, C21A, C21B Description Electrolytic Capacitor; 35V;Electrolytic;DIP Ceramic Capacitor; 100V;X7R;1210; Ceramic Capacitor; 50V;X7R 22μ;100V Ceramic Capacitor; 50V;C0G;0603; Ceramic Capacitor; 16V;X7R Ceramic Capacitor; 16V;X7R;0603; Ceramic Capacitor; 25V;X5R; Package Manufacturer DIP 江海 1210 muRata 1210 TDK C3225X7R1H475K DIP 江海 CD263-100V22' 0603 muRata GRM1885C1H101JA01D 0805 muRata GRM21BR61C474KA01L 0603 TDK 1206 muRata GRM31CR61E226KE15 GRM188R71E104KA01D CD110-35V220 GRM32ER72A225KA35L C1608X7R1C474K 100nF Ceramic Capacitor; 25V;X7R;0603; 0603 muRata 22μF Ceramic Capacitor; 6.3V;X5R;1206 1206 TDK C3216X5R0J226M Ceramic Capacitor; 50V;C0G;0603; 0603 TDK C1608C0G1H150J 1 C22 15pF 1 NC 1210 NC 0603 1 1 C5 C7, C11, C12, C13, C14, C15, C19 C16A C23 NC NC 1206 DIP 1 D1 B160 1 F1 1 L1 1 L2 10μH 1 M1 AM449 0N 6 Part Number 042900 5.WRM 33μH /3.5A Schottky Diode;60V;1A; SMA Diodes B160 Fuse;24V;5A; 1206 littlefuse 0429005.WRM SMD Wurth 744314101 SMD TMP SPC-08045-100GP SO-8 Analog Power Inductor;33μH; 33m;3.5A Inductor;10μH; 36m;3.2A N-Channel Mosfet; 100V;92;12.5;5.2 AM4490N EV3378E-F-00A Rev.1.0 www.MonolithicPower.com 2/17/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. Preliminary Specifications Subject to Change © 2016 MPS. All Rights Reserved. 3 EV3378E-F-00A – 4-CHANNEL WLED DRIVER WITH BUCK CONVERTER PRELIMINARY SPECIFICATIONS SUBJECT TO CHANGE EV3378E-F-00A BILL OF MATERIALS (continued) Qty 1 1 2 Value 357k 10 10k 1 1 1 Ref R2 R3 R4, R23 R5, R9, R12, R13, R15, R19, R29 R6 R7 R8, R16, R20, R21, R30 R10 R11, R14, R18,R24 R17 R22 R25 Package 0603 0603 0603 Manufacturer Yageo Yageo Yageo Film Res., 1% 0603 Yageo RC0603FR-070RL 50m 270 Film Resistor;1%; Film Resistor;1% 1206 0603 Yageo Yageo RL1206FR-070R05L RC0603FR-07270RL 2k Film Resistor;1%; 0603 Yageo RC0603FR-072KL 226k Film Resistor;1% 0603 Yageo RC0603FR-07226KL 100k Film Resistor;1%; 0603 Yageo RC0603FR-07100KL 8.45k 1k 47 Film Resistor;1% Film Resistor;1% Film Resistor;1%; 0603 0603 0603 RC0603FR-078K45L RC0603FR-071KL RC0603FR-0747RL R26 51k Film Resistor;1% 0603 1 1 1 1 1 R27 R28 R31 R32 R1 40.2k 7.68k 604 0 NC Yageo Yageo Yageo SYNTONTECH Yageo Yageo Yageo Yageo 1 1 U1 7 1 1 4 1 3 0 Description Film Resistor;1% Film Resistor;1%; Resistor;1% Film Resistor;1%; Film Resistor;1% Film Resistor;1% Resistor;1%;1/4W; Film Res., 1% MP3378E' 0603 0603 0603 1206 0603 TSSOP 28EP Part Number RC0603FR-07357KL RC0603FR-0710RL RC0603FR-0710KL RC0603FR-0751KL RC0603FR-0740K2L RC0603FR-077K68L RC0603FR-07604RL RC1206FR-070RL MPS EV3378E-F-00A Rev.1.0 www.MonolithicPower.com 2/17/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. Preliminary Specifications Subject to Change © 2016 MPS. All Rights Reserved. 4 EV3378E-F-00A – 4-CHANNEL WLED DRIVER WITH BUCK CONVERTER PRELIMINARY SPECIFICATIONS SUBJECT TO CHANGE EVB TEST RESULTS Performance waveforms are tested on the evaluation board. WLED Controller Section: VIN = 16V, 10 LEDs in series, 4 strings parallel, 120mA/string, TA = 25°C, unless otherwise noted. Steady State VIN Power On EN Power On VBL_SW 20V/div. VBL_SW 20V/div. VBL_SW 20V/div. VD2D_SW 10V/div. VD2D_SW 10V/div. VD2D_SW 10V/div. IL_BL 1A/div. IL_BL 1A/div. ILED 500mA/div. ILED 500mA/div. VEN1 5V/div. ILED 500mA/div. Analog Dimming PWM Dimming VADIM=0.9V FPWM=200Hz, DPWM=50% VBL_SW 20V/div. VBL_SW 20V/div. VD2D_SW 10V/div. VD2D_SW 10V/div. VADIM 1V/div. VPWM 5V/div. ILED 200mA/div. ILED 500mA/div. Short One String Open One String VBL_SW 20V/div. VD2D_SW 10V/div. VLED 20V/div. ILED 200mA/div. Short Inductor Short Diode VBL_SW 20V/div. VBL_SW 20V/div. VBL_SW 20V/div. VD2D_SW 10V/div. VD2D_SW 10V/div. VD2D_SW 10V/div. VLED1 20V/div. VSENSE 5V/div. VSENSE 5V/div. ILED 200mA/div. ILED 500mA/div. ILED 500mA/div. EV3378E-F-00A Rev.1.0 www.MonolithicPower.com 2/17/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. Preliminary Specifications Subject to Change © 2016 MPS. All Rights Reserved. 5 EV3378E-F-00A – 4-CHANNEL WLED DRIVER WITH BUCK CONVERTER PRELIMINARY SPECIFICATIONS SUBJECT TO CHANGE EVB TEST RESULTS Performance waveforms are tested on the evaluation board. Buck Converter Section: VIN = 16V, VOUT=5V, L2=10μH, TA = 25°C, unless otherwise noted. Output Ripple Output Ripple Power Up IOUT=2A IOUT=0A IOUT=2A VOUT/AC 20mV/div. VOUT/AC 20mV/div. VD2D_SW 10V/div. VD2D_SW 10V/div. VD2D_SW 10V/div. VBL_SW 20V/div. VBL_SW 20V/div. VBL_SW 20V/div. IL_D2D IL_D2D 200mA/div. IL_D2D 2A/div. 2A/div. VOUT 5V/div. Power Up Power Off Power Off IOUT=0A IOUT=2A IOUT=0A VOUT 5V/div. VOUT 5V/div. VD2D_SW 10V/div. VD2D_SW 10V/div. VBL_SW 20V/div. VBL_SW 20V/div. VBL_SW 20V/div. IL_D2D 500mA/div. IL_D2D 2A/div. IL_D2D 500mA/div. VOUT 2V/div. VD2D_SW 5V/div. EN Power Off EN Power On Transient Response IOUT=1A to 2A VOUT 5V/div. VOUT 5V/div. VOUT/AC 100mV/div. VD2D_SW 10V/div. VD2D_SW 10V/div. VD2D_SW 20V/div. VEN2 5V/div. VEN2 5V/div. VBL_SW 20V/div. IL_D2D 1A/div. IL_D2D 1A/div. IOUT 1A/div. EV3378E-F-00A Rev.1.0 www.MonolithicPower.com 2/17/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. Preliminary Specifications Subject to Change © 2016 MPS. All Rights Reserved. 6 EV3378E-F-00A – 4-CHANNEL WLED DRIVER WITH BUCK CONVERTER PRELIMINARY SPECIFICATIONS SUBJECT TO CHANGE PRINTED CIRCUIT BOARD LAYOUT Figure 1—Top Layer Figure 2—Bottom Layer EV3378E-F-00A Rev.1.0 www.MonolithicPower.com 2/17/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. Preliminary Specifications Subject to Change © 2016 MPS. All Rights Reserved. 7 EV3378E-F-00A – 4-CHANNEL WLED DRIVER WITH BUCK CONVERTER PRELIMINARY SPECIFICATIONS SUBJECT TO CHANGE QUICK START GUIDE 1. For boost LED driver, connect the positive and negative terminals of the load panel (10 white LEDs in series, 4 stings) to the LED+ and LED-1~4 pins on the EV board, respectively; For buck converter, connect the load between Vout to GND. 2. Connect the positive and negative terminals of the power supply (8V ~ 24V) to the VIN and GND pins on the EV board, respectively. 3. Drive EN1 pin high (5V) to enable the Boost and EN2 pin high to enable the Buck. 4. For PWM dimming, apply a PWM rectangular waveform with a minimum voltage less than 0.4V and a maximum greater than 1.5V on PWM pin (if using PWM pin, need pull ADIM pin to high level). The frequency of the PWM signal is recommended between 200Hz to 2kHz. 5. For analog dimming, apply a DC waveform with a voltage between 0.4 and 1.5V on ADIM pin or a PWM rectangular waveform with a minimum voltage less than 0.4V and a maximum greater than 1.5V on ADIM pin, The frequency of the PWM signal is recommended >=20kHz.. 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. EV3378E-F-00A Rev. 1.0 www.MonolithicPower.com 2/17/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. Preliminary Specifications Subject to Change © 2016 MPS. All Rights Reserved. 8