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TNY254G Datasheet(PDF) 9 Page - Power Integrations, Inc. |
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TNY254G Datasheet(HTML) 9 Page - Power Integrations, Inc. |
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9 / 18 page  TNY253/254/255 9 Rev E 02/12 Figure 13. Recommended PC Layout for the TinySwitch. easilyaccommodatedbyratingtheoutputdiodetohandlethe short-circuitcurrent.Theshort-circuitcurrentcanbeminimized bychoosingthesmallest(lowestcurrentlimit)TinySwitchfor therequiredpower. Layout Single Point Grounding UseasinglepointgroundconnectionattheSOURCEpinfor theBYPASSpincapacitorandtheInputFilterCapacitor(see Figure13). Primary Loop Area Theareaoftheprimaryloopthatconnectstheinputfilterca- pacitor,transformerprimaryandTinySwitchtogether,should bekeptassmallaspossible. Primary Clamp Circuit Aclamporsnubbercircuitisusedtominimizepeakvoltage andringingontheDRAINpinatturn-off.Thiscanbeachieved byusinganRCsnubberforlessthan3WoranRCDclamp asshowninFigure13forhigherpower.AZeneranddiode clampacrosstheprimaryorasingle550VZenerclampfrom DRAINtoSOURCEcanalsobeused.Inallcasescareshould betakentominimizethecircuitpathfromthesnubber/clamp componentstothetransformerandTinySwitch. Thermal Considerations CopperunderneaththeTinySwitchactsnotonlyasasingle pointground,butalsoasaheatsink.Thehatchedareashown inFigure13shouldbemaximizedforgoodheat-sinkingof TinySwitchandoutputdiode. Y Capacitor TheplacementoftheYcapacitorshouldbedirectlyfromthe primarysinglepointgroundtothecommon/returnterminalon thesecondaryside.SuchplacementwillmaximizetheEMI benefitoftheYcapacitor. Optocoupler It is important to maintain the minimum circuit path from the optocoupler transistor to theTinySwitch ENABLE and SOURCEpinstominimizenoisecoupling. Output Diode For best performance, the area of the loop connecting the secondarywinding,theOutputDiodeandtheOutputFilter Capacitor,shouldbeminimized.SeeFigure13foroptimized layout.Inaddition,sufficientcopperareashouldbeprovided attheanodeandcathodeterminalsofthediodetoadequately heatsinkthediodeunderoutputshort-circuitconditions. Input and Output Filter Capacitors Thereareconstrictionsinthetracesconnectedtotheinputand outputfiltercapacitors.Theseconstrictionsarepresentfortwo reasons.Thefirstistoforceallthehighfrequencycurrents toflowthroughthecapacitor(ifthetracewerewidethenit couldflowaroundthecapacitor).Secondly,theconstrictions minimizetheheattransferredfromtheTinySwitchtotheinput filtercapacitorandfromthesecondarydiodetotheoutputfilter capacitor.Thecommon/return(thenegativeoutputterminal inFigure13)terminaloftheoutputfiltercapacitorshouldbe connectedwithashort,lowresistancepathtothesecondary winding.Inaddition,thecommon/returnoutputconnection shouldbetakendirectlyfromthesecondarywindingpinand notfromtheYcapacitorconnectionpoint. TOP VIEW PI-2176-071398 Y1- Capacitor Opto- coupler CBP D EN BP TinySwitch + – HV + – DC OUT Input Filter Capacitor Output Filter Capacitor Safety Spacing Transformer Maximize hatched copper areas ( ) for optimum heat sinking S S PRI SEC |
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