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PKS603P Datasheet(PDF) 10 Page - FERYSTER Inductive Components Manufacturer |
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PKS603P Datasheet(HTML) 10 Page - FERYSTER Inductive Components Manufacturer |
10 / 24 page PKS603-607 Rev. I 02/07 10 Figure 16 shows how to calculate the average power requirementsforadesignwithtwodifferentpeakloadconditions. WhereP Xarethedifferentoutputpowerconditions,ΔtXarethe durationsofeachpeakpowercondition,andTistheperiodof onecycleofthepulseloadcondtion. Audible Noise The cycle skipping mode of operation used in PeakSwitch cangenerateaudiofrequencycomponentsinthetransformer. Tolimitthisaudiblenoisegeneration,thetransformershould be designed such that the peak core flux density is below 3000Gauss(300mT).Followingthisguidelineandusingthe standardtransformerproductiontechniqueofdipvarnishing practicallyeliminatesaudiblenoise.Vacuumimpregnation ofthetransformershouldnotbeusedduetothehighprimary capacitanceandincreasedlossesthatresult. CeramiccapacitorsthatusedielectricssuchasZ5U,whenused inclampcircuits,mayalsogenerateaudionoise.Ifthisisthe casetryreplacingthemwithacapacitorhavingadifferenttypeof dielectricorconstruction,forexampleafilmtypecapacitor. Maximum Flux Density Amaximumvalueof3000Gaussduringnormaloperationis recommendedtolimitthemaximumfluxdensityunderstart upandoutputshortcircuit.Undertheseconditionstheoutput voltageislowandlittleresetofthetransformeroccursduring theMOSFETofftime.Thisallowsthetransformerfluxdensity to staircase above the normal operating level. A value of 3000Gaussatthepeakcurrentlimitoftheselecteddevice, togetherwiththebuiltinprotectionfeaturesofPeakSwitch providessufficientmargintopreventcoresaturationunder startuporoutputshortcircuitconditions. Optocoupler CTR Tominimizethedelayintroducedbytheoptocoupler,itis recommendedthatahigh(300-600%)CTRoptocouplerisused inPeakSwitchdesigns. Bias Winding AllPeakSwitchdesignsmustuseabiaswindingtofeedoperating currentintotheBYPASSpinoncethesupplyisoperational. Itisrecommendedthatthevalueoftheresistorfromthebias windingtotheBYPASSpinbeselectedsuchthatitsuppliesthe samecurrentasthemaximumdatasheetdrainsupplycurrent (I S2)forthespecificdevicebeingused. PeakSwitch Layout Considerations SeeFigure17forarecommendedcircuitboardlayoutfor PeakSwitch. Single Point Grounding DevicesinYandFpackageshaveseparatereturnpinsforthe MOSFETsource(S)andthecontroller(GND)connections whichareinternallyconnected.Thereforeconnectingthese pinsonthePCboardisnotrecommended. DevicesinthePpackagedonothaveseparatereturnpins, but in both cases the low current feedback signals and IC decoupling,highMOSFETcurrentandbiaswindingprimary returnconnectionshouldroutethroughseparatetracestothe Kelvinconnection. Thebiaswindingreturnconnectionistreatedseparately,even thoughitcarrieslowcurrent.Toroutehighcurrentsawayfrom thedevicewhenthesupplyissubjectedtolinesurgetransients, thebiaswindingshouldbereturneddirectlytotheinputbulk capacitor. Bypass Capacitor (C BP) TheBYPASSpincapacitorshouldbelocatedascloseaspossible totheBYPASSandSOURCEpins. Primary Loop Area The area of the primary loop that connects the input filter capacitor,transformerprimaryandPeakSwitchtogethershould bekeptassmallaspossible. Primary Clamp Circuit AclampisusedtolimitthepeakvoltageontheDRAINpin atturnoff.ThiscanbeachievedbyusinganRCDclampora Zener(~200V)anddiodeclampacrosstheprimarywinding. InallcasestominimizeEMIcareshouldbetakentominimize thecircuitpathfromtheclampcomponentstothetransformer andPeakSwitch. Figure 16. Continuous (Average) Output Power Calculation Example. P3 Power (W) Time (t) T ∆t 1 ∆t 2 P2 P1 |
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