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TNY255P Datasheet(PDF) 2 Page - Power Integrations, Inc. |
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TNY255P Datasheet(HTML) 2 Page - Power Integrations, Inc. |
2 / 18 page Rev E 02/12 TNY253/254/255 2 Figure 2. Functional Block Diagram. Figure 3. Pin Configuration. Pin Functional Description DRAIN (D) Pin: PowerMOSFETdrainconnection.Providesinternaloperating currentforbothstart-upandsteady-stateoperation. BYPASS (BP) Pin: Connectionpointforanexternalbypasscapacitorfortheinter- nallygenerated5.8Vsupply.Bypasspinisnotintendedfor sourcingsupplycurrenttoexternalcircuitry. ENABLE (EN) Pin: ThepowerMOSFETswitchingcanbeterminatedbypulling thispinlow.TheI-Vcharacteristicofthispinisequivalentto avoltagesourceofapproximately1.5Vwithasourcecurrent clampof50µA. SOURCE (S) Pin: PowerMOSFETsourceconnection.Primaryreturn. TinySwitch Functional Description TinySwitchisintendedforlowpoweroff-lineapplications.It combinesahigh-voltagepowerMOSFETswitchwithapower supplycontrollerinonedevice.UnlikeaconventionalPWM (Pulse Width Modulator) controller, the TinySwitch uses a simpleON/OFFcontroltoregulatetheoutputvoltage. The TinySwitch controller consists of an Oscillator, Enable (SenseandLogic)circuit,5.8VRegulator,Undervoltagecircuit, HystereticOverTemperatureProtection,CurrentLimitcircuit, LeadingEdgeBlanking,anda700VpowerMOSFET.Figure 2showsafunctionalblockdiagramwiththemostimportant features. Oscillator Theoscillatorfrequencyisinternallysetat44kHz(130kHz fortheTNY255).ThetwosignalsofinterestaretheMaxi- mumDutyCyclesignal(D MAX)whichrunsattypically67% dutycycleandtheClocksignalthatindicatesthebeginningof eachcycle.Whencyclesareskipped(seebelow),theoscilla- torfrequencydoubles(exceptforTNY255whichremainsat 130kHz).ThisincreasesthesamplingrateattheENABLE pinforfasterloopresponse. Enable (Sense and Logic) TheENABLEpincircuithasasourcefollowerinputstageset at1.5V.Theinputcurrentisclampedbyacurrentsourceset at50µAwith10µAhysteresis.Theoutputoftheenablesense PI-2197-061898 CLOCK OSCILLATOR 5.8 V 5.1 V SOURCE S R Q DCMAX BYPASS + - VILIMIT LEADING EDGE BLANKING THERMAL SHUTDOWN + - DRAIN REGULATOR 5.8 V UNDERVOLTAGE 1.5 V + VTH ENABLE Q 50 A PI-2199-031501 ENABLE 8 5 7 6 DRAIN SOURCE SOURCE SOURCE 1 4 2 3 SOURCE SOURCE BYPASS P Package (DIP-8) G Package (SMD-8) |
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