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.

A78S40 are monolithic switching regulator subsystems intended for use as dc to dc con- verters. This butfinitetimeofoutputconductionfollowedbyeithera causesittorapidlyreachtheupperoscillatorthreshold,normalorextendedoff-timeintervalprovidedbythe therebyshorteningthetimeofoutputswitchconductionoscillatorramp-downtimeofCT.

Co2tpktoff 1ok lout 2toff 21pkC0.

Thistotally eliminatesthediodefrombeingusedinthebasicvoltage invertingconfigurationasinFigure15,sincethesub- strate,pin11,iscommontoground. BasicSwitchingRegulatorConfigurations 9N02Theoff-timetoff,isthetimethatdiodeDlisinconduction anditisdeterminedbythetimerequiredfortheinductor currenttoreturntozero.

DonotsetRsc toexceedthemaximumlpk switch limitof1.

Another major advantage of the switching regulator is that it has increased application flexibility of output volt- age. Thusthecom-cycle,multiplecycles,ormultiplecyclesplusaportion paratorcaninitiateoutputswitchconduction,butcannot terminat i e tandthelatchisalwaysresetwhenCTbeginsofCounrerceyntclliem.

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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 an92. The voltageacrosstheinductorisequaltoVin Vsat Vout andthepeakcurrentatanyinstantis: Voir plus Voir moins.

Solvingfortiinknown Substitutingfor 1 bk lout 1ok lout termsyields: The output can be less than, greater than, or of opposite polarity to that of the input voltage. These devices a9n20 a significant advance- ment in the ease of implementing highly efficient and yet simple switching power supplies. M4TOROLOABecausetheintegratedcircuitsubstrateiscommon withtheinternalandexternalcircuitryground,thecath- odeofthediodecannotbeoperatedmuchbelowground orforwardbiasingof thesubstratewillresult.

Article No jsco Available online at http: 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. Theoff-timeis notrelated to theramp-downtimeofCT. Inpracticethecurrentlimitcircuitwillsomewhatmod- ifythechargingslopeandpeakamplitudeofCTeach timethe outputswitchisrequiredtoconduct.

The linear regulator consists of a sta- ble reference, a high gain error amplifier, and a variable resistance series-pass element.

DC-DC Step-Up Converter

Thisallowsthedesignetrheoptionofdrivingthe outputswitchtransistorintosaturationwithaselected forcedgainordrivingitnearsaturationwhenconnected asaDarlington.

Therequiredvaluefor CTcanbedeterminedbyusingtheminimumoscillator chargingcurrentandthetypicalvaluefortheoscillator voltageswingbothtakenfromthedatasheetelectrical characteristicstable. Ichg toffldischgton Figure10showsthestep-upswitchingregulatorwave- forms. Documents Education Rapports de stage Switched-mode power supply Current.

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Order this document by AN D Rev – JADE ALBERKRACK – Rapports de stage

However,apoint ofdiminishingreturnwillbereachedbecausethecom- paratorrequiresafinitevoltagedifferenceacrossits inputstocontrolthelatch. AvalueforthecurrentlimitresistorRsccanbedeter- minedbyusingthecurrentlevelofIpk switch whenVin.

Thefilteraveragetshesquarewavesproducing adcoutputvoltage thatcanbesettoanylevellessthan theinputbycontrollingthepercentconductiontimeof Qitothatofthetotalswitchingcycletime. Thecatch diodeisconstructedfromalateralPNPtransistorandis capableofblockingupto40voltsandwillconductcur- rentsupto1. The error amplifier mon- itors the outputvoltage level,compares it to the reference f generates a linearcontrol signal that varies between two extremes, saturation and cutoff. Vin min O,peratio is n attheonset ofcontinuousmodeandtheoutputcurrent capabilitywillbegreaterthan50 mA.

Thesubstratecurrentwillbeabout 10percentofthecatchdiodecurrentinthestep-upcon- fvioglutraagtieo-innvaenrtdinagbinouwth2i0chppeirnce1n1tiisnctohmemstoenp-tdoothwennaengd- ativeoutput. TheoutputvoltageacrosscapacitorC0willeven- tuallydecaybelownominalbecause itistheonlycom- ponentsupplycurrentintotheexternalloadRL. ThenlL pk attainedduringtonmustdecaytozeroduringtoffanda ratiooftontot0ffcanbewritten.

Referringtothe C02 capacitorcurrentwaveforms inFigure10, t1isdefined asthecapacitorcharginginterval. Thisis becausethethresholdvoltageofthecurrentlimitsense circuitexhibitsasoftvoltageturn-oncharacteristicand hasaturn-offtimedelaythatcausessomeovershoot.

DC-DC Step-Up Converter | Details |

Thediodecan be consideredforuseonlyinlowpowerconverterappli- cationswherethetotalsystemcomponentcountmust beheldtoaminimum. AseparateVCCpinisprovidedinordertoreduce theintegratedcircuitstandbycurrentandisusefulinlow powerapplicationsiftheoperationalamplifierisnot incorporatedintothemainswitchingsystem.

Documents Education Rapports de stage.