DP3773电源芯片替代料PL3376 5W原边反馈恒流恒压方案_骊微电子.pdf

V1.2 1Product DescriptionPL3376C is a high efficiency Primary Side Regulator andhighly integrated PWMPower Switchfor AC/DC powersupply applications.ItsimplifiesconventionalCC/CVcharger/adaptor designs by eliminating the opto-couplerand secondary control circuitry.Constant output voltageand current regulation is realized as shown in the Fig.1below.Multi-mode operations are utilized to achieve low standbypower,high efficiency and audio&noise free.PL3376Coperates in PFM mode at large load condition,with theload becomes medium or light,the chip operates in Greenmode to achieve high efficiency.PL3376C also offers rich protection features includingCycle-by-Cycle peak current limiting,UVLO,OTP,loadOVP,and VDD over voltage.Fig.1.Typical CC/CV CurvePin ConfigurationPL3376CKey FeaturesBuilt-in Integrated Power BJTAccurate Constant CurrentRegulation at Universal AC inputEliminates Opto-coupler and allSecondary CC/CV Control CircuitryBuilt-in Line Compensation forTighter CC/CV RegulationBuilt-in Compensation forTransformer InductanceTolerancesAdjustable Output CableCompensationAdaptive Multi-mode PFMControl for Improving EfficiencyLow Start-up CurrentBuilt-in Leading Edge Blanking(LEB)Cycle-by-Cycle Current LimitingVDD Under Voltage Lockout andVDD over voltage protectionBuilt-in Short Circuit Protection andOutput Overvoltage ProtectionOver temperature protectionApplicationsAC/DC power supply applicationsCell Phone ChargerSmall Power Adaptor/ChargerLED DriverStandby Supply for ConsumerElectronicsPL3376CAccurate CC/CV Primary SidePWM Power SwitchDatasheetPL3376CV1.2 21OverviewPL3376C is a high efficiency Primary SideRegulator and highly integrated PWMPowerSwitchfor AC/DC power supply applications.Itsimplifies conventional CC/CV charger/adaptordesigns by eliminating the opto-coupler andsecondary control circuitry.Constant outputvoltage and current regulation is realizedMulti-mode operations are utilized to achievelow standby power,high efficiency and audio&noise free.PL3376C operates in PFM mode atlarge load condition,with the load becomesmedium or light,the chip operates in Greenmodetoachievehighefficiency.Thisgreen-mode function assists the power supplymeeting the power conservation requirement.Acompletesetofintegratedprotectionfunctions allows PL3376C to protect against allfault conditions including Cycle-by-Cycle peakcurrent limiting,VDD UVLO,and VDD_Clamp.The switch continues attempting start-up untilthe fault condition is removed.PL3376C is offered in SOP7 package.2FeaturesBuilt-in Integrated Power BJTAccurate Constant Current Regulation atUniversal AC inputEliminates Opto-coupler and all SecondaryCC/CV Control CircuitryBuilt-in Line Compensation for TighterCC/CV RegulationBuilt-in Compensation for TransformerInductance TolerancesOutput Cable CompensationAdaptive Multi-mode PFM Control forImproving EfficiencyLow Start-up CurrentBuilt-in Short Circuit ProtectionBuilt-in open Circuit ProtectionLEBOCPVDD_OVPUVLOOTPDatasheetPL3376CV1.2 33Pin DiagramsThe pin map is shown as belowPL3376C4Pin DescriptionPinDescriptionVDDIC power supply.FBThrough two dividing resistors connecting to the bias winding,this pin could getthe information of output to realize the CC/CV regulation.CSThis pin could detect the primary current by the voltage of sensing resistorconnected from CS to GND.CHV BJT collector Pin.This pin is connected to the primary lead of the transformer.EHV BJT emitter Pin.GNDIC ground.5Absolute Maximum RatingsAbsolute maximum ratings are the parameter values or ranges which can cause permanentdamage and affect device reliability if exceeded.ParameterSymbolValueUnitsDC Supply Voltage Range(pin1)VDD-0.3 to VDD clampVCS Input(pin4)CS-0.3 to 5VFB Input(pin3)FB-0.3 to 5VMaximum Junction TemperatureTjmax150Storage TemperatureTsto-55 to 150Lead Temperature(Soldering,10secs)Tlea260Note:These are stress ratings only.Stress beyond these limits may cause permanent damage to the device.Functionaloperation of the device at these or any conditions beyond those indicated under Recommended Operating Conditions isnot implied.Exposure to absolute maximum rated conditions for extended periods of time may affect device reliability.DatasheetPL3376CV1.2 46Recommended Operating ConditionsParameterdataUnitOperating Ambient Temperature-40 105Typical switching frequency full load65kHz7Block DiagramV1.2 810Packaging InformationSOP7SOP7 PackagingPackaging11Important NoticePOWERLINK reserves the right to make changes or corrections to its products at any time withoutnotice.Customersshould verify the datasheets are current and complete before placingorders.