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HT7L4091 Datasheet(PDF) 1 Page - Holtek Semiconductor Inc |
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HT7L4091 Datasheet(HTML) 1 Page - Holtek Semiconductor Inc |
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1 / 17 page  Rev. 1.20 1 March 12, 2013 Rev. 1.00 PB March 12, 2013 HT7L4091 Universal Step-Down PWM Control For High Brightness LED Lighting Control Features • InputsupplyACvoltagerange:100V~240V • Ultralowpower-onstart-upcurrent<30μA • Integrated25VZenerdiodeinternallyconnectedto VINpin • 5VLDOoutputvoltagewith6mAdrivingcurrent forexternalcomponents • FrequencyjitterfunctionforenhancedEMI performance • Efficiency>85% • UnderVoltageLockoutfunction–UVLO • Currentmodeoperationwithcycle-by-cycle currentlimiting • Overtemperatureprotectionfunction • High-currentFETdriveoutput • LinearandPWMdimmingfunction • Enhancedshortcircuitprotectionfunction Applications • AC/DCandDC/DCpowercontrolforhighpower LEDlighting • RGBbacklightingLEDdriver • Flatpaneldisplaysbacklighting • Generalpurposeconstantcurrentsource • SignageanddecorativeLEDlighting • Batterychargers General Description TheHT7L4091deviceprovidesalow-costsolution for active current mode PWM controls of High IntensityLEDdrivesystemssuppliedbyeitherACor DClinepowerlines.Thedeviceoperatesinconstant off-timemodewhichissuitableforbuckLEDdrivers. Thelowstart-upandoperatingcurrentsprovides flexiblepowerrequirementsforhighefficiencyorlow costapplications.Theswitchfrequencyoff-timecan beprogrammedusinganexternalresistor.Thepeak currentmodecontrolachievesgoodoutputcurrent regulationwithoutrequiringloopcompensationsfora widerangeofinputvoltages. IncludedinthedeviceisaPWMdimminginput whichcanacceptanexternalcontrolsignalwitha dutyratiofrom0to100%.Theoutputcurrentcan beprogrammedfrom0to250mAbyapplyingan externalcontrolvoltageonthelineardimmingcontrol input. Thedeviceincludesafrequencyjitterfunctionwhich helpstoreduceEMIpowersupplyemissions.Also containedisanenhancedLEDshortcircuitprotection featuretoprotecttheinternalcircuitryfromdamage shouldtheLEDsbeshortcircuited. Thedevicerequiresaminimumnumberofexternal standardcomponentsandisavailableinan8-pinSOP packageforsmallareaPCBapplications. Ordering Information Part Number Function Description HT7L4091 Frequency jitter function enabled, VUVLO(H)=16V (typ.) HT7L4091-1 Frequency jitter function disabled, VUVLO(L)=8V (typ.) |
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