A723 ADDTEK | Alldatasheet

Document overview

  • Manufacturer or author: Provided By alldatasheet.com(free datasheet download site)
  • PDF pages: 1

Technical content

www.addmtek.com Copyright © 2009 ADDtek Corp. 1 V0.8 -- FEBRUARY 2009 A723 HIGH VOLTAGE BOOST DRIVER WITH

8 CHANNELS CONSTANT CURRENT REGULATORS

„ 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

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 V F 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, R SET, 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. „ Automotive interior lighting „ LED backlight driver for NB and Monitors. TYPICAL APPLICATION CIRCUIT PACKAGE PIN OUT DF L VIN = 4.5V~25V RP CP1 CIN COUT OUT4 GND OUT5 OUT6 OUT8 SW SHDN VIN BYP CVFB ISET SS OUT1 OUT7 OUT3 OUT2 A723 RSET CBP ON/OFF RT CSS VOUT － V LED ＋ COMP GND PWM RT PWM QFN 4mm x 4mm (Top View) 19 18 17 6 7 8 9 VIN SS RT CVFB ISET OUT6 SW PWM OUT1 OUT8 OUT7 OUT5 GND BYP OUT4 COMP GND OUT2 A 7 2 3 †††† SHDN OUT3 ORDER INFORMATION QFN 4mm x 4mm K 20 pin Green Part A723KGT Note: The letter “G” is marked for Green parts, and letter “T” is marked for Tape & Reel.