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PKS603P Datasheet(PDF) 7 Page - Power Integrations, Inc. |
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PKS603P Datasheet(HTML) 7 Page - Power Integrations, Inc. |
7 / 24 page PKS603-607 Rev. I 10/06 7 Figure 13. Normal Power Down Timing (Without UV). Figure 14. Slow Power Down Timing With Optional External (4 MW) UV Resistor Connected to EN/UV Pin. Figure 12. PeakSwitch Power Up Without Optional External UV Resistor Connected to EN/UV Pin. Atmaximumpeakload,PeakSwitchwillconductduringnearly allofitsclockcycles(Figure7).Attheratedcontinuousload, itwill“skip”additionalcyclesinordertomaintainvoltage regulationatthepowersupplyoutput(Figure8).Atmedium loads, cycles will be skipped and the current limit will be reduced(Figure9).Atverylightloads,thecurrentlimitwill bereducedevenfurther(Figure10).Onlyasmallpercentage ofcycleswilloccurtosatisfytheinternalpowerconsumption ofthepowersupplyatno-load. The response time of the ON/OFF control scheme is very fast compared to normal PWM control.This provides tightregulationandexcellenttransientresponse. 0 2.5 5 Time (s) 0 100 200 400 300 0 100 200 V DC-INPUT V DRAIN Power Up/Down The PeakSwitch requires only a 0.33 µF capacitor on the BYPASSpin.Becauseofitssmallsize,thetimetochargethis capacitoriskepttoanabsoluteminimum,typicallylessthan 1.5ms.DuetothefastnatureoftheON/OFFfeedback,there isnoovershootatthepowersupplyoutput.Whenanexternal resistorisconnectedfromthepositiveDCinputtotheEN/UV pin,thepowerMOSFETswitchingwillbedelayedduringpower upuntiltheDClinevoltageexceedsthethreshold(100V). Figures11and12showthepoweruptimingwaveformin applications with and without an external resistor (4 MW) connectedtotheEN/UVpin. Duringpowerdown,whenanexternalresistorisused,the powerMOSFETwillswitchfor30msaftertheoutputloses regulation.ThepowerMOSFETwillthenremainoffwithout anyglitchessincetheunder-voltagefunctionprohibitsrestart whenthelinevoltageislow. Figure13illustratesatypicalpower-downtimingwaveform. Figure14illustratesaveryslowpower-downtimingwaveform asinstandbyapplications.Anexternalresistorisconnectedto theEN/UVpininthiscasetopreventunwantedrestarts. Current Limit Operation EachswitchingcycleisterminatedwhentheDRAIN current reachesthecurrentlimitofthePeakSwitch.Currentlimit operationprovidesgoodlineripplerejection. BYPASS Pin Capacitor TheBYPASSpinusesasmall0.33uFceramiccapacitorfor decouplingtheinternalpowersupply. 0 .5 1 Time (s) 0 100 200 300 0 100 200 400 V DC-INPUT V DRAIN Modifyingcurrentschematic 0 5 10 Time (ms) 0 100 200 0 300 5 0 100 200 V DC-INPUT V BYPASS V DRAIN |
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