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PKS606Y Datasheet(PDF) 10 Page - Power Integrations, Inc.

Part # PKS606Y
Description  Enhanced, Energy-Efficient, Off-Line Switcher IC With Super Peak Power Performance
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Manufacturer  POWERINT [Power Integrations, Inc.]
Direct Link  http://www.powerint.com
Logo POWERINT - Power Integrations, Inc.

PKS606Y Datasheet(HTML) 10 Page - Power Integrations, Inc.

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PKS603-607
Rev. I 10/06
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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