手机充电器RCC电路的设计.pdf

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1、AN2228APPLICATIONNOTESTD1LNK60Z-basedCellPhoneBatteryChargerDesignIntroductionThisapplicationnoteisaRingingChokeConverter(RCC)-based,step-by-stepcellphonebatterychargerdesignprocedure.TheRCCisessentialtotheself-oscillatingfly-backconverter,andoperateswithintheDiscontinuousCo

2、nductionMode(DCM)andContinuousConductionMode(CCM)boundarieswithoutnoticeablereverserecoveryoftheoutputrectifyingdiodes.RCCcontrolisachievedbyusingdiscretecomponentstocontrolthepeakcurrentmode,sotheoverallRCCcostisrelativelylowcomparedtotheconventionalPulseWidthModulation(PWM

3、)ICfly-backconverter.Asaresult,RCCiswidelyusedforlowpowerapplicationsinindustryandhomeappliancesasasimpleandcost-effectivesolution.Figure1.STD1LNK60Z-basedRCCPrintedCircuitBoardTopViewBottomViewRev1.0September20051/26http:/www.st.com26AN2228-APPLICATIONNOTETableofContents1Po

4、werTransformerDesignCalculations...........................51.1SwitchingFrequency............................................51.2STD1LNK60ZMOSFETTurnRatio................................61.3PrimaryCurrent...............................................71.4PrimaryInductance...

5、..........................................71.5MagneticCoreSize.............................................81.6PrimaryWinding...............................................81.7SecondaryWinding............................................101.8AuxiliaryWinding..................

6、...........................101.9GapLength..................................................112STD1LNK60Z-basedRCCControlCircuitComponents.............122.1MOSFET....................................................122.2R3StartupResistor........................................

7、...122.3OptocouplerPowerMethods.....................................132.4R7SenseResistor............................................142.5ConstantPowerControl........................................152.6ZeroCurrentSense...........................................162.7ConstantV

8、oltageAndConstantCurrent............................173TestResults.........