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PKS604Y Datasheet(PDF) 5 Page - Power Integrations, Inc. |
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PKS604Y Datasheet(HTML) 5 Page - Power Integrations, Inc. |
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5 / 24 page  PKS603-607 Rev. I 10/06 5 V DRAIN V EN CLOCK D DRAIN I MAX PI-2749-050301 Figure 7. PeakSwitch Operation at Near Maximum Loading. V DRAIN V EN CLOCK D DRAIN I MAX PI-2667-090700 Figure 6. PeakSwitch Auto-Restart Operation. the line under-voltage sense circuit prevents a restart attempt until the AC input voltage is removed (I EN<25µA).Thentheinternalauto-restartlatchisresetand thepowerMOSFETswitchingwillresumeoncetheACinput voltageisappliedagain(I EN>25µA).Thiseffectivelyprovides alatchingshutdownfunctionwithACresetduringsuchafault condition. Whenabrownoutorlinesagoccurs,outputregulationmaybe lostandtheEN/UVpinwillreceivenofeedback(itispulled low).After30msofnofeedback,MOSFETswitchingisdisabled. SincetheAClineisabnormallylow(I EN<25µA)MOSFET switchingremainsdisableduntilnormallinevoltageisrestored. ThepowerMOSFETswitchingwillresumeoncetheACinput returnstonormal(I EN>25µA).Thiseffectivelydisablesthe latchingshutdownfunctionduringsuchacondition. Auto-Restart (UV resistor not present) In the event of a fault condition such as output overload, outputshortcircuitoranopenloopcondition,PeakSwitch enters into auto-restart operation. An internal counter clockedbytheoscillatorisreseteverytimetheEN/UVpin is pulled low. When the EN/UV pin receives no feedback for 30 ms, the power MOSFET switching is disabled for 5 seconds (150 ms for the first auto-restart event). The auto-restart alternately enables and disables the switching ofthepowerMOSFETuntilthefaultconditionisremoved. Figure6illustratesauto-restartcircuitoperationinthepresence ofanoutputshortcircuit. Adaptive Switching Cycle On-time Extension Adaptiveswitchingcycleon-timeextensionkeepstheMOSFET onuntilcurrentlimitisreached,insteadofterminatingafter theDC MAXsignalgoeslow.Thison-timeextensionisadaptive becauseitonlyoccursaftertheENABLEpinhasbeenhigh forapproximately750µs,aconditionthatwouldariseifthe 0 5 10 Time (s) 0 5 0 10 100 200 300 VDRAIN VDC-OUTPUT peakoutputpowerwasrequiredinlowlineconditions.On-time extensionisdisabledduringthestartupofthepowersupply. PeakSwitch Operation PeakSwitch devicesoperateinthecurrent-limitmode.When enabled,theoscillatorturnsthepowerMOSFETonatthe beginningofeachcycle.TheMOSFETisturnedoffwhenthe currentrampsuptothecurrentlimitorwhentheDC MAXlimit isreached.Sincethehighestcurrentlimitlevelandfrequency Figure 8. PeakSwitch Operation at Moderately Heavy Loading. |
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