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TNY253G Datasheet(PDF) 7 Page - Power Integrations, Inc. |
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TNY253G Datasheet(HTML) 7 Page - Power Integrations, Inc. |
7 / 19 page TNY253/254/255 7 Rev E 02/12 Figure 11. 3.6 W Constant Voltage-Constant Current Cellular Phone Charger Circuit. Figure11showsa5.2V,3.6Wcellularphonechargercircuit thatusestheTNY254andprovidesconstantvoltageandconstant currentoutputoveranuniversalinput(85to265VAC)range. TheACinputisrectifiedandfilteredbyD1-D4,C1andC2 tocreateahigh-voltageDCbusconnectedtoT1inserieswith thehigh-voltageMOSFETinsidetheTNY254.Theinductor L1formsaπ-filterinconjunctionwithC1andC2.Theresistor R1dampsresonancesintheinductorL1.Thelowfrequencyof operationofTNY254(44kHz)allowsuseofthesimpleπ-filter describedaboveincombinationwithasingleY1-capacitorC8 tomeetworldwideconductedEMIstandards.ThediodeD6, capacitorC4andresistorR2comprisetheclampcircuitthat limitstheturn-offvoltagespikeontheTinySwitchDRAINpin toasafevalue.Thesecondarywindingisrectifiedandfiltered byD5andC5toprovidethe5.2Voutput.Additionalfiltering isprovidedbyL2andC6.Theoutputvoltageisdetermined bythesumoftheoptocouplerU2LEDforwarddrop(~1V) andZenerdiodeVR1voltage.TheresistorR8,maintainsa biascurrentthroughtheZenertoimproveitsvoltagetolerance. AsimpleconstantcurrentcircuitisimplementedusingtheV BE oftransistorQ1tosensethevoltageacrossthecurrentsense resistorR4,whichcanbemadeupofoneormoreresistorsto Figure 12. 0.5 W Open Loop AC Adapter Circuit. PI-2244-082898 TinySwitch D S EN BP + 5.2 V RTN D1 1N4005 C1 6.8 F 400 V Fusible RF1 10 C3 0.1 F 85 - 265 VAC L1 560 H D2 1N4005 D3 1N4005 D4 1N4005 R2 100 k 1 W U2 LTV817 D5 FR201 L2 3.3 H C5 220 F 25 V C2 4.7 F 400 V C6 220 F 16 V R7 100 R3 22 R4 1 1 W R9 47 Q1 2N3904 R8 820 VR1 1N5230B 4.7 V C8 2.2 nF Y1 Safety U1 TNY254P C4 2200 pF D6 1N4937 R6 0.82 1/2 W T1 R1 1.2 k 1 2 5 10 R5 18 1/8 W PI-2190-031501 TinySwitch D S EN BP + 9 V RTN D1 1N4004 C1 2.2 F 200 V Fusible RF1 1.8 C4 68 pF 1 KV 115 VAC ± 15% R2 100 D2 1N4004 C3 0.1 F D3 1N3934 C6 100 F 16V C2 2.2 F 200 V VR1 1N5239B C5 2.2 nF Y1 Safety U1 TNY253P T1 1 5 6 10 |
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