EV3398E-F-00A

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4 strings WLED Controller With 80V Return Evaluation Board EV3398E-F-00A Rev.1.0 www.MonolithicPower.com 1 9/6/2016 MPS Proprietary Information. Patent Protec ted. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. The Future of Analog IC Technology

DESCRIPTION

The MP3398E is a step-up controller with four current channels designed to drive WLED arrays for large size LCD panel backlighting applications. The MP3398E is able to expand the number of LED channels with two or more ICs in parallel sharing a single power source. The MP3398E employs peak-current mode with a fixed switching frequency. The frequency is programmable through an external setting resistor. The MP3398E drives an external MOSFET to boost up the output voltage from a 4.5V to 33V input supply and regulates the current in each LED string to the value set by an external current-setting resistor. The MP3398E applies four internal current sources for current balancing. The current matching achieves 2.3% regulation accuracy between strings. The low regulation voltage on the LED current sources reduces power loss. The MP3398E supports direct PWM dimming and analog dimming with PWM input. Full protection features include over-current protection (OCP), Over-temperature protection (OTP), Under-voltage protection (UVP), over- voltage protection (OVP), LED short/open protection, and inductor/diode short protection. The MP3398E is available in TSSOP-16EP and PDIP-16 packages. ELECTRICAL SPECIFICATIONS Parameter Symbol Value Units Input Voltage VIN 13 – 33 V LEDs # 4 LED strings

20 LEDs/string

LED Current I LED 120/string mA

FEATURES

 4-String, Max 400mA/String WLED Driver  4.5V to 33V Input Voltage Range  80V ABS. Rating for Each String  2.3% Current Matching Accuracy Between Each String  Direct PWM Dimming Mode  Analog Dimming Mode with PWM Input  Cascading Capability with a Single Power Source  LED Open and Short Protection  Programmable Recoverable Over-Voltage Protection (OVP)  202mV Latch-off Cycle-by-Cycle Current Limit Threshold  Recoverable Thermal Shutdown Protection  Available in TSSOP-16EP and PDIP-16 Packages

APPLICATIONS

 Desktop LCD Flat Panel Displays  All-in-one PCs  2D/3D LCD TVs 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.

EV3398E-F-00A 4 STRINGS 80V WLED CONTROLLER EV3398E-F-00A Rev.1.0 www.MonolithicPower.com 2 9/6/2016 MPS Proprietary Information. Patent Protec ted. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. EV3398E-F-00A EVALUATION BOARD (L x W x H) 7.75cm x 4.88cm x 1.1cm Board Number MPS IC Number EV3398E-F-00A MP3398EGF EVALUATION BOARD SCHEMATIC

EV3398E-F-00A 4 STRINGS 80V WLED CONTROLLER EV3398E-F-00A Rev.1.0 www.MonolithicPower.com 3 9/6/2016 MPS Proprietary Information. Patent Protec ted. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. EV3398E-F-00A BILL OF MATERIALS Qty Ref Value Description Package Manufacturer Part Number

1 C1 220µF Electrolytic Capacitor,

2 C2,C3 2.2µF Ceramic Capacitor, 100V, X7R 1210 Murata GRM32ER72A225KA35L 1 C4 4.7µF Ceramic Capacitor, 50V, X7R 1210 Murata GRM32ER71H475KA88L

1 C5 NC 1210

1 C6 22µF Electrolytic Capacitor,

C7,C11, C13,C12 NC 0603

1 C8 100pF Ceramic

Capacitor,50V, COG 0603 Murata GRM1885C1H101JA01D

1 C9 470nF Ceramic Capacitor,

16V, X7R 0805 Murata GRM219R71C474KA01D

2 C10 470nF Ceramic Capacitor,

16V, X7R 0603 Murata GRM18R7C474KA88D

1 D1 Diode Schottky, 90V,

1 F1 0Ω Resistor, 1% 1206 Yageo RC1206FR-070RL

1 L1 33µH Inductor,5.5A,45mohm SMD Wurth 7447709330

1 M1 N- channel MOSFET SO8 Analog

1 R1 NC 0603

1 R2 316kΩ Resistor, 1% 0603 Yageo RC0603FR-07316KL

2 R5 10Ω Resistor, 1% 0603 Yageo RC0603FR-0710RL

1 R4 10kΩ Resistor, 1% 0603 Yageo RC0603FR-0710KL

R3,R9,R 12,R13,R 15,R19 0Ω Resistor, 1% 0603 Y ageo RC0603JR-070RL

1 R7 270Ω Resistor, 1% 0603 Yageo RC0603FR-07270RL

1 R6 0.05Ω Current Resistor, 1% 1206 Yageo RC1206FR-070R05L R8,R16, R18,R20 2kΩ Resistor, 1% 0603 Yageo RC0603FR-072KL R10,R11, R14, R21 100kΩ Resistor, 1% 0603 Yageo RC0603FR-07100KL

1 R17 165kΩ Resistor, 1% 0603 Yageo RC0603FR-07165KL

1 U1 LED Driver IC TSSOP-

EV3398E-F-00A 4 STRINGS 80V WLED CONTROLLER EV3398E-F-00A Rev.1.0 www.MonolithicPower.com 4 9/6/2016 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 = 19V, VEN=3.3V, 120mA/string, 4 strings, 20 LEDs in series, TA = 25°C, unless otherwise noted. VSW 50V/div. VOUT 50V/div. IL 2A/div. ILED 200mA/div. VSW 20V/div. VPWM 2V/div. IL 2A/div. ILED 200mA/div. VSW 50V/div. VLED1 50V/div. IL 1A/div. ILED 200mA/div. VSW 50V/div. VPWM 5V/div. IL 2A/div. ILED 500mA/div. VSW 50V/div. VOUT 50V/div. IL 1A/div. ILED 200mA/div. VSW 50V/div. VEN 5V/div. IL 1A/div. ILED 200mA/div. VSW 50V/div. VSENSE 500mV/div. IL 2A/div. ILED 200mA/div. VSW 50V/div. VSENSE 1V/div. IL 10A/div. ILED 200mA/div. VSW 50V/div. VOUT 20V/div. IL 1A/div. ILED 200mA/div.

EV3398E-F-00A 4 STRINGS 80V WLED CONTROLLER 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. EV3398E-F-00A Rev. 1.0 www.MonolithicPower.com 6 9/6/2016 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 panel (20 white LEDs in series, 4 stings) to the LED+ and LED1~4 pins on the EV board, respectively. 2. Connect the positive and negative terminals of the power supply (13V ~ 33V) to the VIN and GND pins on the EV board, respectively. 3. Drive EN pin high (5V) to enable the MP3398E. 4. For PWM dimming, apply a PWM rectangular wave form with a minimum voltage less than 0.4V and a maximum greater than 1.5V on PDIM pin. The frequency of the PWM signal is recommended between 200Hz to 2kHz. 5. For analog dimming, apply 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 between >20kHz.