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SA60 Datasheet(PDF) 5 Page - Cirrus Logic |
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SA60 Datasheet(HTML) 5 Page - Cirrus Logic |
5 / 6 page SA60U 5 P r o d u c t I n n o v a t i o n F r o m SA60 GENERAL PleasereadApplicationNote30on"PWMBasics".RefertoApplicationNote1"GeneralOperatingConsiderations" forhelpfulinformationregardingpowersupplies,heatsinkingandmounting.Visitwww.Cirrus.comfordesigntools thathelpautomatepwmfilterdesign;heatsinkselection;ApexPrecisionPower’scompleteApplicationNotesli- brary;TechnicalSeminarWorkbook;andEvaluationKits. PWM OSCILLATOR – INTERNAL OR ExTERNAL TheSA60containsaninternalPWMoscillatorwhosefrequencyisdeterminedbyanexternalcapacitorconnected betweenpin1andpin2.Maximumfrequencyis125kHz.TheusermayalsodisregardtheinternalPWMoscillator andsupplytheSA60withanexternalTTLpulsegeneratorupto250KHZ. PIN DESCRIPTION VCC-isthelowvoltagesupplyforpoweringinternallogicanddriversforthelowsideandhighsideMOSFETS.The suppliesforthehighsidedriversarederivedfromthisvoltage. VS-isthehighervoltageH-bridgesupply.TheMOSFETSobtaintheoutputcurrentfromthissupplypin.Thevoltage onthispinislimitedto+80VbythedriveIC.TheMOSFETSareratedat100volts. ISENSE A & B-Thesearetiedtopowergnddirectlyorthroughsenseresistors. ANALOG GND-isthereferencefortheinternalPWMoscillator.Connectthispintopin6.ConnectlowsideofVcc supplyandanyothersupplyusedtogenerateanaloginputsignalstoANALOGGND. ANALOG INPUT-isananaloginputforcontrollingthePWMpulsewidthofthebridge.AvoltagehigherthanVcc/2 willproducegreaterthan50%dutycyclepulsesoutofBOUT.AvoltagelowerthanVcc/2willproducegreater than50%dutycyclepulsesoutofAOUT.Ifusinginthedigitalmode,biasthispointat1/2thelogichighlevel. DISABLE-Istheconnectionfordisablingall4outputswitches.DISABLEhighoverridesallotherinputs.When takenlow,everythingfunctionsnormally.AninternalpulluptoVccwillkeepDISABLEhighifpinleftopen. PWM INPUT-IstheTTLcompatibledigitalinputforcontrollingthePWMpulsewidthofthebridge.Adutycycle greaterthan50%willproducegreaterthan50%dutycyclepulsesoutoftheAout.Adutycyclelessthan50% willproducegreaterthan50%dutycyclefromtheBout.Foranaloginputs,theintegrationcapacitorforthe internalclockmustbeconnectedbetweenthispinandanalogground.Theinternalswitchingfrequencyispro- grammableupto125kHzbyselectionoftheintegrationcapacitor.Theformulais: BYPASSING Adequatebypassingofthepowersuppliesisrequiredforproperoperation.Failuretodosocancauseerraticand lowefficiencyoperationaswellasexcessiveringingattheoutputs.TheVssupplyshouldbebypassedwithat leasta1µFceramiccapacitorinparallelwithanotherlowESRcapacitorofatleast10µFperampofoutputcurrent. Capacitortypesratedforswitchingapplicationsaretheonlytypesthatshouldbeconsidered.The1µFceramic capacitormustbephysicallyconnecteddirectlytotheVsandPOWERGNDpins.Evenoneinchofleadlengthwill causeexcessiveringingattheoutputs.Thisisduetotheveryfastswitchingtimesandtheinductanceofthelead connection.ThebypassingrequirementsoftheVccsupplyarelessstringent,butstillnecessary.A.1µFto.47µF ceramiccapacitorconnecteddirectlytotheVccandANALOGGNDpinswillsuffice. PCB LAYOUT ThedesignerneedstoappreciatethattheSA60combinesinonecircuitbothhighspeedhighpowerswitchingand lowlevelanalogsignals.Certainlayoutrulesofthumbmustbeconsideredwhenacircuitboardlayoutisdesigned usingtheSA60: 1. Bypassingofthepowersuppliesiscritical.Capacitorsmustbeconnecteddirectlytothepowersupplypinswith veryshortleadlengths(wellunder1inch).Ceramicchipcapacitorsarebest. 2. ConnectANALOGGNDtoPOWERGNDwithaconductorhavingnointermediateconnections.ConnectallVs powersupply,filterandloadrelatedgroundconnectionstoPOWERGNDkeepingtheseconductorsseparate – 50 C F (pF) = 1.44 x10 Fsw ( )7 |
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