The PR4404 of Prema company is the driver of low-pressure step up that applies to 0.5W/1W high-power LED, can from single cell (1.2V/1.5V) is offerred be as high as 150mALED electric current or from two batteries (2.4V/3.0V) is offerred be as high as 300mALED electric current. Accordingly, PR4404 can be used extensively in LED torch, LCD screen is in a poor light, domestic illume and toy. The article introduced PR4404 major attribute, block diagram, representative application circuit, test circuit, flashlight uses circuit, LED acts plan of circuit of drive circuit graph and drive of PWM pilot LED.

LowVoltageBoostDriverPR4404for0.5W/1WPowerLEDs
ThePR4404isastep-upconverterforwhiteLEDs, operatingwithsinglebatterycELlSupply(1.2/1.5V)atupto150mALEDcurrentordualcellsupply(2.4/3.0V)atupto
300mALEDcurrent.
Aminimumpartcountallowscompactandcost-efficientsolutions.
Theconvertercanbeswitchedonandoffwithalogicsignal, whichisusefule.g.forPWMControl, timercircuitsetc.



PR4404 major attribute: Minimumstartupvoltage1.0VSupplybyoneortwobatterycellsLownumberofexternalcomponentsBatterydeepdischargeprotection
Application:
LEDtorches
LCDpanelbacklightingHomelightingToys



图1.PR4404方框图




Graph circuit of 2.PR4404 representative application



图3.PR4404测试电路

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