EV3378-S-00A 4 Strings, Step Up WLED Controller Plus High Efficiency Step down Converter The Future of Analog IC Technology DESCRIPTION FEATURES The MP3378 is a one-chip solution, specially designed for monitor applications, which includes a step-up controller with 4 current channels for backlight and a high efficiency buck converter for internal bus voltage or standby power. WLED Controller: 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 LED Protection Programmable Over-Voltage Protection Recoverable thermal Shutdown Protection Over Current Protection Over Temperature Protection Inductor/Diode short Protection Buck Converter: 90mΩ/40mΩ Low Rds(on) Internal Power MOSFETs Low Quiescent Current Fixed 233kHz Switching Frequency Frequency Sync from 250kHz to 2MHz External Clock AAM Power Save Mode Internal Soft Start OCP Protection and Hiccup 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 can support both analog and PWM dimming independently to meet the special dimming mode request. In addition, rich protection modes are also integrated including OCP, OTP, UVP, OVP, LED short/open protection, inductor/diode short protection. The high efficiency buck converter operates in the current mode operation with built in MOSFET and synchronous rectifier. It offers a very compact solution to achieve excellent load and line regulation. Full protection features include OCP and thermal shut down. The MP3378 is available in SOIC28 package. APPLICATIONS ELECTRICAL SPECIFICATIONS Parameter Symbol Value Units Input Voltage VIN 8– 24 V 4 LED strings 10 LEDs/string LEDs # LCD Monitors 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. LED Current ILED 120/string mA IOUT Current (buck) IOUT 2 A EV3378-S-00A Rev.1.0 www.MonolithicPower.com 2/2/2015 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 1 EV3378-S-00A – 4-CHANNEL WLED CONTROLLER PLUS BUCK CONVERTER EV3378-S-00A EVALUATION BOARD (L x W x H) 5.9cm x 8.4cm x 2cm Board Number MPS IC Number EV3378-S-00A MP3378GS EVALUATION BOARD SCHEMATIC 8V-24V VIN F1 1 1 L1 33uH/3.2A C4 C5 C1 4.7uF NC 220uF R32 2 D1 0 M1 100V/4A R3 10 GND 24 C9 470nF GND1 C10 R8 2K C11 PWM 1 GND1 NC 8V-24V C23 NC 27 2 226K 4 C12 R14 100K NC 28 3 R16 2K C13 270 GND1 R18 100K GND1 C16A NC R17 C15 8.45K NC 15 C18 100nF R30 GND1 C16 C17 22uF 100nF NC 21 14 13 18 GND2 VIN GATE VCC1 ISENSE COMP GND1 EN OSC OVP LED1 MP3378LED2 ADIM PWM LED3 ISET LED4 IN BST SYNC SW VCC2 FB AAM NC GND2 NC GND2 AGND R19 9 NC GND1 R9 0 R12 0 R13 0 R15 0 5 R25 47 C20 100nF R26 51K L2 10uH C21A 22uF R27 40.2K 1K R23 10K 1 R24 75K R22 Gate 2 GND2 C19 1nF 5V/2A 1 Vout 1 GND GND2 C22 15pF 19 R29 0 GND2 GND2 C21 C21B 22uF 22uF R31 604 10 11 LED1 LED2 LED3 LED4 GND1 6 12 1 R21 2K GND1 7 20 1 C8 100pF C14 8 16 1 GND1 R4 10K 1 R6 50m 0 C3 R2 C2 2.2uF 357K 2.2uF C6 22uF/100V 1 17 NC GND1 22 1 C7 1, 2, 3 0 23 2 1 GND1 R20 2K 26 R10 R11 100K NC A-DIM R7 470nF GND1 2 1 25 1 EN/BL IN R5 U1 1 NC 4 Gate 1 GND1 R1 5, 6, 7, 8 2 IN 10S 4P 120mA/string 1 LED GND2 R28 7.68K GND2 GND2 GND2 EV3378-S-00A Rev.1.0 www.MonolithicPower.com 2/2/2015 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 2 EV3378-S-00A – 4-CHANNEL WLED CONTROLLER PLUS BUCK CONVERTER EV3378-S-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 C17, C18, C20 100nF 1 C19 3 Description Electrolytic Capacitor; 35V;Electrolytic;DIP; Ceramic Capacitor; 100V;X7R;1210; Ceramic Capacitor; 50V;X7R; Package Manufacturer Part Number DIP 江海 1210 muRata 1210 TDK C3225X7R1H475K DIP 江海 CD263-100V22' 0603 muRata GRM1885C1H101JA01D 0805 muRata GRM21BR61C474KA01L 0603 TDK 1206 muRata GRM31CR61E226KE15 Ceramic Capacitor; 25V;X7R;0603; 0603 muRata GRM188R71E104KA01D 1nF Ceramic Capacitor; 50V;C0G;0603; 0603 muRata GRM1885C1H102JA01D C21, C21A, C21B 22μF Ceramic Capacitor; 6.3V;X5R;1206 1206 TDK C3216X5R0J226M 1 C22 15pF Ceramic Capacitor; 50V;C0G;0603; 0603 TDK C1608C0G1H150J 1 NC 1210 NC 0603 1 1 1 C5 C7, C11, C12, C13, C14, C15 C16A C23 D1 Schottky Diode;60V;1A; 1206 DIP SMA Diodes B160 1 F1 Fuse;24V;5A; 1206 littlefuse 0429005.WRM 1 L1 Inductor;33uH;33m;3.5A; SMD Wurth 744314101 1 L2 NC NC B160 0429005. WRM 33μH /3.5A 10μH SMD TMP SPC-08045-100GP 1 M1 AM4490N 1 1 R2 R3 R4, R23 357k 10 Inductor;10uH;36m;3.2A; N-Channel Mosfet; 100V;92;12.5;5.2; Film Resistor;1%; Film Resistor;1%; 10k Resistor;1%; 6 2 22u;100V; Ceramic Capacitor; 50V;C0G;0603; Ceramic Capacitor; 16V;X7R; Ceramic Capacitor; 16V;X7R;0603; Ceramic Capacitor; 25V;X5R; SO-8 CD110-35V220 GRM32ER72A225KA35L C1608X7R1C474K Analog Power AM4490N 0603 0603 Yageo Yageo RC0603FR-07357KL RC0603FR-0710RL 0603 Yageo RC0603FR-0710KL EV3378-S-00A Rev.1.0 www.MonolithicPower.com 2/2/2015 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 3 EV3378-S-00A – 4-CHANNEL WLED CONTROLLER PLUS BUCK CONVERTER EV3378-S-00A BILL OF MATERIALS (continued) Qty Value 1 1 1 1 Ref R5, R9, R12, R13, R15, R19, R29 R6 R7 R8, R16, R20, R21 R10 R11, R14, R18 R17 R22 R24 R25 1 1 1 1 1 1 1 7 1 1 4 1 3 Package Manufacturer 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 75k 47 Film Resistor;1%; Film Resistor;1%; Film Resistor;1%; Film Resistor;1%; 0603 0603 0603 0603 RC0603FR-078K45L RC0603FR-071KL RC0603FR-0775KL RC0603FR-0747RL R26 51k Film Resistor;1%; 0603 R27 R28 R31 R32 R1,R30 U1 40.2k 7.68k 604 0 NC Film Resistor;1%; Film Resistor;1% Film Resistor;1% Resistor;1%;1/4W; Film Res; 1% MP3378 0603 0603 0603 1206 0603 SOIC28 Yageo Yageo Yageo Yageo SYNTONTECH Yageo Yageo Yageo Yageo 0 Description Part Number RC0603FR-0751KL RC0603FR-0740K2L RC0603FR-077K68L RC0603FR-07604RL RC1206FR-070RL MPS EV3378-S-00A Rev.1.0 www.MonolithicPower.com 2/2/2015 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 4 EV3378-S-00A – 4-CHANNEL WLED CONTROLLER PLUS BUCK CONVERTER EVB TEST RESULTS Performance waveforms are tested on the evaluation board. 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. VBL_EN 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. VOUT 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. VLED 20V/div. VSENSE 5V/div. VSENSE 5V/div. ILED 200mA/div. ILED 500mA/div. ILED 500mA/div. EV3378-S-00A Rev.1.0 www.MonolithicPower.com 2/2/2015 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 5 EV3378-S-00A – 4-CHANNEL WLED CONTROLLER PLUS BUCK CONVERTER EVB TEST RESULTS (continued) Performance waveforms are tested on the evaluation board. VIN = 16V, 10 LEDs in series, 4 strings parallel, 120mA/string, TA = 25°C, unless otherwise noted. Output Ripple Output Ripple Power Up IOUT=2A IOUT=0A IOUT=2A VOUT/AC 20mV/div. VOUT/AC 50mV/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. ILED 2A/div. ILED 2A/div. ILED 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. VOUT 2V/div. VD2D_SW 5V/div. VBL_SW 20V/div. VBL_SW 20V/div. VBL_SW 20V/div. ILED 500mA/div. ILED 2A/div. ILED 500mA/div. Transient Response IOUT=1A to 2A VOUT/AC 200mV/div. VD2D_SW 20V/div. VBL_SW 50V/div. IOUT 1A/div. EV3378-S-00A Rev.1.0 www.MonolithicPower.com 2/2/2015 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 6 EV3378-S-00A – 4-CHANNEL WLED CONTROLLER PLUS BUCK CONVERTER PRINTED CIRCUIT BOARD LAYOUT Figure 1—Top Layer Figure 2—Bottom Layer EV3378-S-00A Rev.1.0 www.MonolithicPower.com 2/2/2015 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 7 EV3378-S-00A – 4-CHANNEL WLED CONTROLLER PLUS BUCK CONVERTER QUICK START GUIDE 1. For Boost LED Controller, connect the positive and negative terminals of the load panel (10 white LEDs in series, 4 stings) to the LED and LED1~4 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. Then the Buck Converter will work. 3. Pull both PWM and A-DIM pin to high level (1.5-5V). 4. Pull EN/BL pin high (1.5-5V) to enable the Boost LED Controller. 5. 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. The LED current is chopped by PWM signal. The frequency of the PWM signal is recommended between 200Hz to 2kHz. 6. For analog dimming, apply a DC waveform with a voltage between 0.4 and 1.5V on A-DIM pin; or a PWM rectangular waveform with a minimum voltage less than 0.4V and a maximum greater than 1.5V on A-DIM pin, the frequency of the PWM signal is recommended >=20kHz. The amplitude of LED current linearly follows the voltage of A-DIM or the duty of the PWM signal. 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. EV3378-S-00A Rev. 1.0 www.MonolithicPower.com 2/2/2015 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 8