Prema公司的PR4404是适用于0.5W/1W大功率LED的低压升压驱动器,能从单电池(1.2V/1.5V)提供高达150mALED电流或从两节电池(2.4V/3.0V)提供高达300mALED电流.因此,PR4404可广泛用在LED火炬,LCD屏背光,家庭照明和玩具.本文介绍了PR4404主要特性,方框图,典型应用电路,测试电路,手电筒应用电路,LED串驱动电路图以及PWM控制的LED驱动电路图.
LowVoltageBoostDriverPR4404for0.5W/1WPowerLEDs
ThePR4404isastep-upconverterforwhiteLEDs,operatingwithsinglebatterycELl
supply(1.2/1.5V)atupto150mALEDcurrentordualcellsupply(2.4/3.0V)atupto
300mALEDcurrent.
Aminimumpartcountallowscompactandcost-efficientsolutions.
Theconvertercanbeswitchedonandoffwithalogicsignal,whichisusefule.g.forPWM
control,timercircuitsetc.
PR4404主要特性:
minimumstartupvoltage1.0V
supplybyoneortwobatterycells
lownumberofexternalcomponents
batterydeepdischargeprotection
应用:
LEDtorches
LCDpanelbacklighting
homelighting
toys
图1.PR4404方框图
图2.PR4404典型应用电路
图3.PR4404测试电路
详情请见PDF文档