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1、Intersil ISL97694A单个锂电池六路LED驱动方案关键词：电源管理,LED驱动器,DC/DC转换器Intersil公司的ISL97692/3/4A是单个锂电池驱动的4四/六路LED驱动器,静态电流仅为1mA,输入电压可低至是四路,提供8位PWM调光,可调频率高达30kHz, ISL97693是六路,Direct PWM调光控制,ISL97694A是六路,提供8/10/12位PWM调光,可调频率分别是30kHz,7.5kHz或1.875kHz.主要用于平板电脑,笔记本电脑和智能手机显示器LED背光.本文介绍了ISL97692/3/4A主要特性,方框图,应用电路图和PCB布局图.Th
2、e ISL97692, ISL97693, ISL97694A are Intersils highly integrated 4- and 6-channel LED drivers for display backlighting . These parts ma*imize battery life by featuring only 1mA quiescent current, and by operating down to 2.4V input voltage, with no need for higher voltage supplies.The ISL97692 has 4
3、channels and provides 8-bit PWM dimming with adjustable dimming frequency up to 30kHz. The ISL97693 has 6 channels with Direct PWM dimming control.The ISL97694A has 6 channels and provides 8-, 10-, or 12-bit PWM dimming with adjustable dimming frequency up to 30kHz, 7.5kHz, or 1.875kHz, respectively
4、, controlled with I2C or PWM input.ISL97692 and ISL97694A feature phase shifting that may be enabled optionally, with a phase delay between channels optimized for the number of active channels. In ISL97694A, phase shifting can multiply the effective dimming frequency by 6 allowing above-audio PWM di
5、mming with 10-bit dimming resolution.The ISL97692/3/4A employ adaptive boost architecture, which keeps the headroom voltage as low as possible to ma*imize battery life while allowing ultra low dimming dutycycle as low as 0.005% at 100Hz dimming frequency in Direct PWM mode.The ISL97692/3/4A incorpor
6、ate e*tensive protection functions including string open and short circuit detections, OVP, and OTP.The ISL97692/3 are offered in the 16 Ld 3mm*3mm TQFN package and ISL97694A is offered in the 20 Ld 3mm*4mm TQFN package. All parts operate in ambient temperaturerange of -40 to +85.ISL97692/3/4A主要特性:
7、2.4V Minimum Input Voltage, No Need for Higher Voltage Supplies 4 Channels, up to 40mA Each (ISL97692) or 6 Channels, up to 30mA Each (ISL97693/4A) 90% Efficient at 6P5S, 3.7V and 20mA (ISL97693/4A) Low 0.8mA Quiescent Current PWM Dimming Control with Internally Generated Clock- 8-bit Resolution wit
8、h Adjustable Dimming Frequency up to 30kHz (ISL97692/4A)- 12-bit Resolution with Adjustable Dimming Frequency up to 1.875kHz (ISL97694A)- Optional Automatic Channel Phase Shift (ISL97692/4A)- Linear Dimming from 0.025%100% up to 5kHz or 0.4%100% up to 30kHz (ISL97692/4A) Direct PWM Dimming with 0.00
9、5% Minimum Duty Cycle at 100Hz 2.5% Output Current Matching Adjustable Switching Frequency from 400kHz to 1.5MHzISL97692/3/4A应用: Tablet, Notebook PC and Smart Phone Displays LED Backlighting图1.ISL97692框图图2.ISL97693框图图3.ISL97694A 框图图4.ISL97692典型应用电路图5.ISL97693典型应用电路图6.ISL97694A典型应用电路图7.输入电压高达26V的LED驱动电路图8.ISL97694A典型PCB布局图
