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PKS606F Datasheet(PDF) 6 Page - Power Integrations, Inc. |
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PKS606F Datasheet(HTML) 6 Page - Power Integrations, Inc. |
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6 / 24 page  PKS603-607 Rev. I 10/06 6 Figure 11. PeakSwitch Power Up with Optional External UV Resistor (4 MW) Connected to EN/UV Pin. PI-2661-072400 V DRAIN V EN CLOCK D DRAIN I MAX Figure 10. PeakSwitch Operation at Very Light Loading. of a PeakSwitch design are constant, the power delivered totheloadisproportionaltotheprimaryinductanceofthe transformerandpeakprimarycurrentsquared.Hence,designing thesupplyinvolvescalculatingtheprimaryinductanceofthe transformerforthemaximumoutputpowerrequired.Ifthe chosenPeakSwitchfamilymemberisappropriateforthepower level,thecurrentinthecalculatedinductancewillrampupto currentlimitbeforetheDC MAXlimitisreached. Enable Function PeakSwitch sensestheEN/UVpintodeterminewhetherornot toproceedwiththenextswitchingcycleasdescribedearlier. Thesequenceofcyclesisusedtodeterminethecurrentlimit. Onceacycleisstarted,italwayscompletesthecycle(evenwhen theEN/UVpinchangesstatehalfwaythroughthecycle).This operationresultsinapowersupplyinwhichtheoutputvoltage rippleisdeterminedbytheoutputcapacitor,amountofenergy perswitchcycleandthedelayofthefeedback. The EN/UV pin signal is produced on the secondary by comparingthepowersupplyoutputvoltagewithareference voltage.TheEN/UVpinsignalishighwhenthepowersupply outputvoltageislessthanthereferencevoltage. Inatypicalimplementation,theEN/UVpinisdrivenbyan optocoupler. The collector of the optocoupler transistor is connectedtotheEN/UVpinandtheemitterisconnectedto theSOURCEpin.TheoptocouplerLEDisconnectedinseries withaZenerdiodeacrosstheDCoutputvoltagetoberegulated. Whentheoutputvoltageexceedsthetargetregulationvoltage level(optocouplerLEDvoltagedropplusZenervoltage),the optocouplerLEDwillstarttoconduct,pullingtheEN/UVpin Figure 9. PeakSwitch Operation at Medium Loading. PI-2377-091100 V DRAIN V EN CLOCK D DRAIN I MAX low.TheZenerdiodecanbereplacedbyaTL431reference circuitforimprovedaccuracy. ON/OFF Operation with Current-Limit State Machine TheinternalclockofthePeakSwitchrunsallthetime.Atthe beginningofeachclockcycle,itsamplestheEN/UVpinto decidewhetherornottoimplementaswitchcycle,andbased onthesequenceofsamplesovermultiplecycles,itdetermines theappropriatecurrentlimit.Athighloads,whentheEN/UV pinishigh(lessthan240µAoutofthepin),aswitchingcycle withthefullcurrentlimitoccurs.Atlighterloads,whenEN/UV ishigh,aswitchingcyclewithareducedcurrentlimitoccurs. 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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