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发布者:微桥 发布时间:2009-12-31 阅读:8287次   
PT4112-Notebook 6通道LED背光驱动


PT4112 是一款带电流源的电源转换芯片,该芯片具有
步进启动功能,并且电流源能够驱动6串并行的WLED。适用于笔记本背光。

PT4112-WLED Driver for Notebook Display PDF文档下载

PT4112应用说明.pdf PDF文档下载

<<<微桥提供PT4112<<<

GENERAL DESCRIPTION
    The PT4112 is a step-up converter with current sources capable of driving six parallel strings of up to 10 series-connected WLEDs. Each string is terminated with ballast that achieves ±1.5% current regulation accuracy, ensuring even brightness for all WLEDs. The PT4112 generates an output voltage to drive up to totally 60 WLEDs from a 5V to 25V input source; in addition, the output voltage is automatically adjusted to WLED forward voltage to achieve good efficiency.
    The PT4112 supports pulse width modulation (PWM) brightness dimming. A PWM signal input on the BRT pin could directly turn LED lights on/off. By freezing the circuit state during dimming off stage, the AC ripple on output ceramic capacitors is minimized across a wide duty cycle range; therefore reduce the potential audible noise.
    The PT4112 has multiple features to protect itself from fault conditions including built-in open lamp over voltage protection, cycle-by-cycle current limit, over temperature shutdown, input under voltage lock out and integrated soft-start. Additionally, PT4112 provides a driver output for an external PFET connected between the input and inductor. The PFET will be turned off by PT4112 to disconnect the battery from the WLEDs when severe error happens thus any leakage current of the battery is prevented.
 
FEATURES
 
¨          5V to 25V wide input voltage range
¨          1.2MHz switch frequency with dithering
¨          Integrated 1.5A 40V MOSFET
¨          Six-channel current sink adjustable from 15mA to
¨          25mA
¨          ±1.5% current accuracy between strings
¨          100:1 PWM dimming range
¨          Boost output voltage auto-adjust to maximum
¨          forward voltage LED string
¨          Small external components
¨          Cycle by cycle current limiting
¨          Built in soft start
¨          Open/Short lamp self protection
¨          Current auto-adjust when open lamp detected
¨          Drive for input/output isolation PFET
¨          16 pin 3×3 QFN pakage
 
APPLICATIONS
 
¨          Notebook LCD display Backlight
¨          General middle-sized LCD backlight
 
TYPICAL APPLICATIONS
 
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