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TNY253P Datasheet(PDF) 6 Page - Power Integrations, Inc. |
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TNY253P Datasheet(HTML) 6 Page - Power Integrations, Inc. |
6 / 18 page Rev E 02/12 TNY253/254/255 6 Figure 9. 1.3 W TV Standby Circuit using TNY253. Figure 10. 10 W Standby Supply Circuit. useofalowcostEE16coretransformeruptothe10Wlevel. Figure10showsa5V,10Wcircuitforsuchanapplication. Thecircuitoperatesfromthehigh-voltageDCsupplyalready availablefromthemainpowersupply.CapacitorC1filtersthe high-voltageDCsupply,andisnecessaryonlyifthereisalong tracelengthfromthesourceoftheDCsupplytotheinputsof thestandbycircuit.Thehigh-voltageDCbusisappliedtothe primarywindingofT1inserieswiththeintegratedhigh-voltage MOSFETinsidetheTNY255.ThediodeD1,capacitorC2and resistorR1comprisetheclampcircuitthatlimitstheturn-off voltagespikeontheTinySwitchDRAINpintoasafevalue. ThesecondarywindingisrectifiedandfilteredbyD2andC4 toprovidethe5Vouput.Additionalfilteringisprovidedby L1andC5.Theoutputvoltageisdeterminedbythesumofthe optocouplerU2LEDforwarddrop(~1V)andZenerdiode VR1voltage.TheresistorR2,maintainsabiascurrentthrough theZenertoimproveitsvoltagetolerance.Fortightertolerance, aTL431precisionreferenceICfeedbackcircuitmaybeused. Cellular Phone Charger TheTinySwitchiswellsuitedforapplicationsthatrequirea constantvoltageandconstantcurrentoutput.TinySwitchis alwayspoweredfromtheinputhigh-voltage,thereforeitdoes notrequirebiaswindingforpower.Consequently,itsopera- tionisnotdependentontheleveloftheoutputvoltage.This allowsforconstantcurrentchargerdesignsthatworkdownto zerovoltsontheoutput. PI-2242-082898 TinySwitch D S EN BP + 5 V RTN C1 0.01 F 1 kV C3 0.1 F 240 - 375 VDC R1 150 k 1 W U2 LTV817 D2 SB540 L1 10 H C4 2700 F 6.3 V C5 220 F 10 V VR1 1N5229B U1 TNY255P C2 4700 pF 1 kV T1 1 4 8 10 R2 68 D1 1N4937 Optional PI-2246-082898 DC IN 120 - 375 VDC TinySwitch D S EN BP + – + 7.5 V RTN C3 0.1 F R2 1 k VR1 1N5235B C1 0.01 F 1 kV R1 100 1/2 W C2 56 pF 1 kV D1 1N4934 L1 15 H C5 47 F 10 V C4 330 F 10 V U1 TNY253P T1 U2 SFH615-2 C6 680 pF Y1 Safety 1 4 8 10 Optional |
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