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| A723 www.addmtek.com DESCRIPTION The A723 is a high voltage Boost driver with 8 channels adjustable constant current regulators for LED backlight applications. Eight regulated current ports are designed to provide uniform and pure DC constant current sinks for driving LEDs within a large range VF variations. It can drive a number of LEDs in series/parallel configuration. Users may adjust the output current from 5mA to 30mA through an external resistor, RSET, which gives users flexibility in controlling the light intensity of LEDs. It also could adjust LED brightness from 0% to 100% via PWM pin with Pulse Width Modulation signal. A feedback circuit is built in the between of Boost Driver and the Current Regulators. It could output the lowest dropout voltage among used channels to Boost Driver in order to maintain the output voltage in optimal level. An OVP circuit is built for open-loop protection when any string becomes open. The thermal protection function protects IC from over temperature damage. Also, the exposed thermal pad enhances the package power dissipation. TYPICAL APPLICATION CIRCUIT VIN = 4.5V~25V CIN L DF HIGH VOLTAGE BOOST DRIVER WITH 8 CHANNELS CONSTANT CURRENT REGULATORS FEATURES High frequency DC/DC converter for LEDs. Integrated 50V power MOSFET. 4.5V ~ 25V wide input voltage range. 8 constant-current output channels. Output current adjustable through external resistor. Constant output current range: 5mA~30mA. 45V current sinks breakdown voltage for up to 12 pcs of LEDs in series. LED open/short protection. Green Package. APPLICATIONS Automotive interior lighting LED backlight driver for NB and Monitors. PACKAGE PIN OUT VOUT OUT1 OUT2 17 PWM PWM PWM SW OUT2 OUT1 OUT3 20 19 18 SHDN OUT4 GND OUT3 16 15 14 COUT SW 1 2 OUT4 GND GND OUT5 OUT6 ON/OFF SHDN BYP BYP V LED A723 CBP RT VIN RT CVFB 3 4 5 6 7 8 13 12 11 VIN RT CVFB A723 COMP OUT8 OUT7 GND OUT5 OUT6 ISET SS 9 10 ISET SS COMP OUT8 RSET CSS RP CP1 R1 R2 QFN 4mm x 4mm (Top View) ORDER INFORMATION K Green Part Copyright (c) 2009 ADDtek Corp. QFN 4mm x 4mm 20 pin A723KGT Note: The letter "G" is marked for Green parts, and letter "T" is marked for Tape & Reel. 1 V0.8 -- FEBRUARY 2009 OUT7 |
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