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AN920 D PDF

Publication Order Number: AN/D. AN/D GENERAL DESCRIPTION The MC series is a monolithic control circuit containing all the active functions. And Mc Pwm Controler – Download as PDF File .pdf), Text File .txt) or read online. AN/D for additional design information. The excel spread sheet for thermal considerations is available too. The MC is an extended temperature.

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Operationof theswitchingregulator withaseverelyoverloadedorshortedoutputorhaving inanoverloadorshortedconditionwillcauseaveryshort theinputvoltagegrosslyabovethe nominaldesignvalue. AseparateVCCpinisprovidedinordertoreduce theintegratedcircuitstandbycurrentandisusefulinlow powerapplicationsiftheoperationalamplifierisnot incorporatedintothemainswitchingsystem.

Co2tpktoff 1ok lout 2toff 21pkC0.

M4TOROLOABecausetheintegratedcircuitsubstrateiscommon withtheinternalandexternalcircuitryground,thecath- odeofthediodecannotbeoperatedmuchbelowground orforwardbiasingof thesubstratewillresult. TheoutputvoltageacrosscapacitorC0willeven- tuallydecaybelownominalbecause itistheonlycom- ponentsupplycurrentintotheexternalloadRL.

DonotsetRsc toexceedthemaximumlpk switch limitof1.

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This signal is used to vary the resistance of the series-pass element in a corrective fashion in an90 to maintain a constant output voltage under varying input voltage and output load conditions. The use of switching regulators is becoming more pronounced over that of linear regulators because the size reductions In new equipment designs require greater conversion efficiency. Documents Education Rapports de stage Switched-mode power supply Current.

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Thediodecan be consideredforuseonlyinlowpowerconverterappli- cationswherethetotalsystemcomponentcountmust beheldtoaminimum. Thesubstratecurrentwillbeabout 10percentofthecatchdiodecurrentinthestep-upcon- fvioglutraagtieo-innvaenrtdinagbinouwth2i0chppeirnce1n1tiisnctohmemstoenp-tdoothwennaengd- ativeoutput.

ThenlL pk attainedduringtonmustdecaytozeroduringtoffanda ratiooftontot0ffcanbewritten.

Referringtothe C02 capacitorcurrentwaveforms inFigure10, t1isdefined asthecapacitorcharginginterval. AvalueforthecurrentlimitresistorRsccanbedeter- minedbyusingthecurrentlevelofIpk switch whenVin. Thisis becausethethresholdvoltageofthecurrentlimitsense circuitexhibitsasoftvoltageturn-oncharacteristicand hasaturn-offtimedelaythatcausessomeovershoot.

Documents Education Xn920 de stage. Article No jsco Available online at http: Thecatch diodeisconstructedfromalateralPNPtransistorandis capableofblockingupto40voltsandwillconductcur- rentsupto1. BasicSwitchingRegulatorConfigurations 9N02Theoff-timetoff,isthetimethatdiodeDlisinconduction anditisdeterminedbythetimerequiredfortheinductor currenttoreturntozero. This butfinitetimeofoutputconductionfollowedbyeithera causesittorapidlyreachtheupperoscillatorthreshold,normalorextendedoff-timeintervalprovidedbythe therebyshorteningthetimeofoutputswitchconductionoscillatorramp-downtimeofCT.

Thusthecom-cycle,multiplecycles,ormultiplecyclesplusaportion paratorcaninitiateoutputswitchconduction,butcannot terminat i e tandthelatchisalwaysresetwhenCTbeginsofCounrerceyntclliem.

Solvingfortiinknown Substitutingfor 1 bk lout 1ok lout termsyields: The voltageacrosstheinductorisequaltoVin Vsat Vout andthepeakcurrentatanyinstantis: Theoff-timeis notrelated to theramp-downtimeofCT.

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Thefilteraveragetshesquarewavesproducing adcoutputvoltage thatcanbesettoanylevellessthan theinputbycontrollingthepercentconductiontimeof Qitothatofthetotalswitchingcycletime. Another major advantage of the switching regulator is that it has increased application flexibility of output volt- age.

The output can be less than, greater than, or of opposite polarity to that of the input voltage. The linear regulator consists of a sta- ble reference, a high gain error amplifier, and a variable na920 series-pass element.

DC-DC Step-Up Converter

Ichg toffldischgton Figure10showsthestep-upswitchingregulatorwave- an20. Voir plus Voir moins. However,apoint ofdiminishingreturnwillbereachedbecausethecom- paratorrequiresafinitevoltagedifferenceacrossits inputstocontrolthelatch. Inpracticethecurrentlimitcircuitwillsomewhatmod- ifythechargingslopeandpeakamplitudeofCTeach timethe outputswitchisrequiredtoconduct. The error amplifier mon- itors the outputvoltage level,compares it to the reference and generates a linearcontrol signal that varies between two extremes, saturation and cutoff.

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Vin min O,peratio is n attheonset ofcontinuousmodeandtheoutputcurrent capabilitywillbegreaterthan50 mA. Thistotally eliminatesthediodefrombeingusedinthebasicvoltage invertingconfigurationasinFigure15,sincethesub- strate,pin11,iscommontoground.

Therequiredvaluefor CTcanbedeterminedbyusingtheminimumoscillator chargingcurrentandthetypicalvaluefortheoscillator voltageswingbothtakenfromthedatasheetelectrical characteristicstable. These devices represent a significant advance- ment in the ease of implementing a9n20 efficient and yet simple switching power supplies. A78S40 are monolithic switching regulator subsystems intended for use as dc to dc con- verters.

Thisallowsthedesignetrheoptionofdrivingthe outputswitchtransistorintosaturationwithaselected forcedgainordrivingitnearsaturationwhenconnected asaDarlington.