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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Therequiredvaluefor CTcanbedeterminedbyusingtheminimumoscillator chargingcurrentandthetypicalvaluefortheoscillator voltageswingbothtakenfromthedatasheetelectrical characteristicstable. 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. However,apoint ofdiminishingreturnwillbereachedbecausethecom- paratorrequiresafinitevoltagedifferenceacrossits inputstocontrolthelatch.

Referringtothe C02 capacitorcurrentwaveforms inFigure10, t1isdefined asthecapacitorcharginginterval. DonotsetRsc toexceedthemaximumlpk switch limitof1. This signal is used to vary the resistance of the series-pass element in a corrective fashion in order to maintain a constant output voltage under varying input voltage and output load conditions. The voltageacrosstheinductorisequaltoVin Vsat Vout andthepeakcurrentatanyinstantis: A78S40 are monolithic switching regulator subsystems intended for use as dc to dc con- verters.

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Article No jsco Available online at http: This butfinitetimeofoutputconductionfollowedbyeithera causesittorapidlyreachtheupperoscillatorthreshold,normalorextendedoff-timeintervalprovidedbythe therebyshorteningthetimeofoutputswitchconductionoscillatorramp-downtimeofCT.

Ichg toffldischgton Figure10showsthestep-upswitchingregulatorwave- forms. 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. Voir plus Voir moins. The linear regulator consists of a sta- ble reference, a high gain error amplifier, and a variable resistance series-pass element.

Documents Education Rapports de stage Switched-mode power supply Current.

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Operationof theswitchingregulator withaseverelyoverloadedorshortedoutputorhaving inanoverloadorshortedconditionwillcauseaveryshort theinputvoltagegrosslyabovethe nominaldesignvalue. Thisallowsthedesignetrheoptionofdrivingthe outputswitchtransistorintosaturationwithaselected forcedgainordrivingitnearsaturationwhenconnected asaDarlington.

M4TOROLOABecausetheintegratedcircuitsubstrateiscommon withtheinternalandexternalcircuitryground,thecath- odeofthediodecannotbeoperatedmuchbelowground orforwardbiasingof thesubstratewillresult. Thistotally eliminatesthediodefrombeingusedinthebasicvoltage invertingconfigurationasinFigure15,sincethesub- strate,pin11,iscommontoground.

ThenlL pk attainedduringtonmustdecaytozeroduringtoffanda ratiooftontot0ffcanbewritten. Inpracticethecurrentlimitcircuitwillsomewhatmod- ifythechargingslopeandpeakamplitudeofCTeach timethe outputswitchisrequiredtoconduct. BasicSwitchingRegulatorConfigurations 9N02Theoff-timetoff,isthetimethatdiodeDlisinconduction anditisdeterminedbythetimerequiredfortheinductor currenttoreturntozero.

Co2tpktoff 1ok lout 2toff 21pkC0. Thefilteraveragetshesquarewavesproducing adcoutputvoltage thatcanbesettoanylevellessthan theinputbycontrollingthepercentconductiontimeof Qitothatofthetotalswitchingcycletime. Thecatch diodeisconstructedfromalateralPNPtransistorandis capableofblockingupto40voltsandwillconductcur- rentsupto1.

DC-DC Step-Up Converter

These devices represent a significant advance- ment in the ease of implementing highly efficient and yet simple switching power supplies. Vin min O,peratio is n attheonset ofcontinuousmodeandtheoutputcurrent capabilitywillbegreaterthan50 mA.

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The error amplifier mon- itors the outputvoltage level,compares it to the reference and generates v linearcontrol signal that varies between two extremes, saturation and cutoff. TheoutputvoltageacrosscapacitorC0willeven- tuallydecaybelownominalbecause itistheonlycom- ponentsupplycurrentintotheexternalloadRL.

Thisis becausethethresholdvoltageofthecurrentlimitsense circuitexhibitsasoftvoltageturn-oncharacteristicand hasaturn-offtimedelaythatcausessomeovershoot. Solvingfortiinknown Substitutingfor 1 bk lout 1ok lout termsyields: Thesubstratecurrentwillbeabout 10percentofthecatchdiodecurrentinthestep-upcon- fvioglutraagtieo-innvaenrtdinagbinouwth2i0chppeirnce1n1tiisnctohmemstoenp-tdoothwennaengd- ativeoutput. AvalueforthecurrentlimitresistorRsccanbedeter- minedbyusingthecurrentlevelofIpk switch whenVin.

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

AseparateVCCpinisprovidedinordertoreduce theintegratedcircuitstandbycurrentandisusefulinlow powerapplicationsiftheoperationalamplifierisnot incorporatedintothemainswitchingsystem. Documents Education Rapports de stage.