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MP3389 Datasheet(PDF) 1 Page - Monolithic Power Systems |
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MP3389 Datasheet(HTML) 1 Page - Monolithic Power Systems |
1 / 16 page MP3389 12–String, Step-up White LED Driver MP3389 Rev. 1.04 www.MonolithicPower.com 1 3/27/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. The Future of Analog IC Technology DESCRIPTION The MP3389 is a step-up controller with 12- channel current sources designed for driving the WLED arrays for large size LCD panel backlighting applications. The MP3389 uses current mode, fixed frequency architecture. The switching frequency is programmable by an external frequency setting resistor. It drives an external MOSFET to boost up the output voltage from a 5V to 28V input supply. The MP3389 regulates the current in each LED string to the programmed value set by an external current setting resistor. The MP3389 applies 12 internal current sources for current balance. And the current matching can achieve 2.5% regulation accuracy between strings. Its low 550mV regulation voltage on LED current sources reduces power loss and improves efficiency. PWM dimming is implemented with external PWM input signal or DC input signal. The dimming PWM signal can be generated internally, and the dimming frequency is programmed by an external setting capacitor. FEATURES • High Efficiency and Small Size • 5V to 28V Input Voltage Range • Balanced Driver for 12 Strings of WLEDs • Maximum 60mA for Each String • 2.5% Current Matching Accuracy Between Strings • Programmable Switching Frequency • PWM or DC Input Burst PWM Dimming • Open and Short LED protection • Programmable Over-voltage Protection • Under Voltage Lockout • Thermal Shutdown • 28-pin TSSOP and 28-pin SOIC Package APPLICATIONS • Desktop LCD Flat Panel Displays • Flat Panel Video Displays • 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 Quality Assurance. “MPS” and “The Future of Analog IC Technology” are Registered Trademarks of Monolithic Power Systems, Inc. TYPICAL APPLICATION VIN 5V~28V MP3389 ISENSE GATE EN OSC NC BOSC GND DBRT NC OVP LED1 LED2 LED3 8 1 10 7 6 9 26 24 28 23 22 21 Enable DIMMING L1 D1 CIN R1 R2 RSET CBOSC ROSC RSENSE M2 LED4 LED5 LED6 RCOMP 20 19 18 17 VIN VCC COMP 2 3 4 5 ISET COUT CCOMP CVCC RBOSC VCC LED12 LED11 LED10 11 12 13 14 LED9 VFAULT 27 PGND 25 LED7 LED8 16 15 M1 |
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