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REGULATING PULSE WIDTH MODULATORS TO V OPERATION V REFERENCE TRIMMED TO Hz TO KHz OSCILLATOR RANGE SEPARATE OSCILLATORSYNC TERMINAL ADJUSTABLE DEADTIME CONTROL INTERNAL SOFT START PULSE BY PULSESHUTDOWN INPUT UNDERVOLTAGE LOCKOUT WITH

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Description

Niveau: Supérieur, Doctorat, Bac+8
SG2525A SG3525A REGULATING PULSE WIDTH MODULATORS .8 TO 35 V OPERATION . 5.1 V REFERENCE TRIMMED TO ± 1 % . 100 Hz TO 500 KHz OSCILLATOR RANGE .SEPARATE OSCILLATORSYNC TERMINAL .ADJUSTABLE DEADTIME CONTROL . INTERNAL SOFT-START .PULSE-BY-PULSESHUTDOWN . INPUT UNDERVOLTAGE LOCKOUT WITH HYSTERESIS . LATCHING PWM TO PREVENT MULTIPLE PULSES .DUAL SOURCE/SINK OUTPUT DRIVERS DESCRIPTION The SG3525Aseries of pulse width modulator inte- grated circuits are designed to offer improved per- formance and lowered external parts count when used in designing all types of switching power sup- plies. The on-chip + 5.1 V reference is trimmed to ± 1 % andthe inputcommon-mode rangeof the error amplifier includes the reference voltage eliminating external resistors. A sync input to the oscillator al- lows multiple units to beslaved or a single unit to be synchronized to an external system clock. A single resistorbetweentheCT andthe dischargeterminals provide a wide range of dead time ad- justment. Thesedevicesalso featurebuilt-insoft-startcircuitry with only an external timing capacitor required. A shutdownterminal controlsboth the soft-start circu- ity and the output stages, providing instantaneous turn off through the PWM latch with pulsed shut- down, as well as soft-start recycle with longer shut- down commands. These functionsare also control- ledby an undervoltagelockoutwhich keepsthe out- puts off and the soft-start capacitor discharged for sub-normal input voltages.

  • input bias

  • output

  • temperature stability

  • oscillator al- lows

  • iosc oscillator

  • resistance junction

  • current


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 SSGG32552255AAREGULATINGPULSEWIDTHMODULATORS58.1TOV3R5EVFEORPEENRCAETITORNIMMEDTO±1%1S0E0PHAzRTAOTE5O00SKCIHLzLAOTSOCIRLSLYATNOCRTERRANMIGNEALIANDTJEURSNTAALBSLEOFDTE-SATDATIRMTECONTROLPULSE-BY-PULSESHUTDOWN.IHNYPSUTTERUENSIDSERVOLTAGELOCKOUTWITHDIP1616(Narrow).LATCHINGPWMTOPREVENTMULTIPLEPULSES.DUALSOURCE/SINKOUTPUTDRIVERSDESCRIPTIONgTrhaeteSdGci3r5c2ui5tsAsareeriedseosifgpnuelsdetowiodftfhermimodpurloavteodripnteer--tduorwnno,ffasthwroelulgahstshoeft-PstWartMrleactycchlewwitihthploulnsgeedrsshhuutt--formanceandloweredexternalpartscountwhendowncommands.Thesefunctionsarealsocontrol-pulsieesd.iTnhdeeosing-ncihnipg+all5t.y1pVesreoffesrewnitccehiisntgripmowmeerdstuop±-lpeudtsbyofafnaunnddtehrevoslotfat-gsetlaortckcoauptawcihtiocrhdkisecehpasrtgheedofuotr-a1m%plaifinedrtihnecliundpeusttchoemrmefoenr-emncoedevorlatanggeeeolfitmhienaetrirnogrcsluubd-ensorapmparloinxipmutatveollyta5g0e0s.mTVhiosflhoycskteoruetsciisrfcouritjritytienr--leoxwtesrnmaulltrieplseisutonritss.tAosbyensclaivnepdutotroatshiengolsecuillnaitttoorbale-fcrueitesoispearaltiaotcnh.fAonlloothwienrgfetahteurceoomfptahreasteorP.WOnMcecira-rseysniscthorrobnieztewdeteonathneeCxtTearnnadltshyesdtiesmchcalrogcek.teArmsiinngallestPheWoMutppuultssewsillhraesmbaeiennotffefromritnhaeteddurfaotrioannoyfrtehaespoen-,provideawiderangeofdeadtimead-justment.Thesedevicesalsofeaturebuilt-insoft-startcircuitryroioutdp.uTthsetalagtecshiasreretsoettemwi-tpholeeacdhescilgoncskcpaulpsaeb.leThoefswhituhtdoonwlyntaenrmeixntealrncaolnttirmolisnbgocthatphaecistoorftr-estqauritrceirdc.uA-sSoGu3rc5i2n5gAoorutspiuntksitnaggienfeeatxucreesssNoOfR2l0o0gic,mgAi.vinTghaeityandtheoutputstages,providinginstantaneousLOWoutputforanOFFstate.PINCONNECTIONSANDORDERINGNUMBERS(topview)June2000TypePlasticDIPSO16SG2525ASG2525ANSG2525APSG3525ASG3525ANSG3525AP21/1