SA60EE Datasheet SA60EE | P4-P6

SA60

4 SA60U

TYPICAL APPLICATION

Awidevarietyofloadscanbedrivenineitherthe

voltagemodeorthecurrentmode.Themostcommonap-

plicationsusethreeexternalblocks:alowpassltercon-

vertingpulsewidthdatatoananalogoutput,adifference

ampliertomonitorvoltageorcurrentandanerrorampli-

er.Filterinductorsmustbesuitableforsquarewavesat

the switching frequency (laminated steel is generally not

acceptable).FiltercapacitorsmustbelowESRandrated

fortheexpectedripplecurrent.Adifferenceamplierwith

gainoflessthanonetranslatesthedifferentialoutputvoltagetoasinglefeedbackvoltage.Dashedlineconnections

andahighergaindifferenceamplierwouldbeusedforcurrentcontrol.Theerroramplierintegratesthedifference

betweentheinputandfeedbackvoltagestoclosetheloop.

GENERAL

PleasereadApplicationNote30on"PWMBasics".RefertoApplicationNote1"GeneralOperatingConsiderations"

forhelpfulinformationregardingpowersupplies,heatsinkingandmounting.Visitwww.apexanalog.comfordesign

toolsthathelpautomatepwmlterdesign;heatsinkselection;ApexMicrotechnology’scompleteApplicationNotes

library;TechnicalSeminarWorkbook;andEvaluationKits.

PWM OSCILLATOR – INTERNAL OR EXTERNAL

TheSA60containsaninternalPWMoscillatorwhosefrequencyisdeterminedbyanexternalcapacitorconnected

betweenpin1andpin2.Maximumfrequencyis125kHz.TheusermayalsodisregardtheinternalPWMoscillator

andsupplytheSA60withanexternalTTLpulsegeneratorupto250KHZ.

PIN DESCRIPTION

-isthelowvoltagesupplyforpoweringinternallogicanddriversforthelowsideandhighsideMOSFETS.

Thesuppliesforthehighsidedriversarederivedfromthisvoltage.

-isthehighervoltageH-bridgesupply.TheMOSFETSobtaintheoutputcurrentfromthissupplypin.Thevoltage

onthispinislimitedto+80VbythedriveIC.TheMOSFETSareratedat100volts.

ISENSE A & B-Thesearetiedtopowergnddirectlyorthroughsenseresistors.

ANALOG GND-isthereferencefortheinternalPWMoscillator.Connectthispintopin6.ConnectlowsideofVcc

supplyandanyothersupplyusedtogenerateanaloginputsignalstoANALOGGND.

ANALOG INPUT-isananaloginputforcontrollingthePWMpulsewidthofthebridge.AvoltagehigherthanVcc/2

willproducegreaterthan50%dutycyclepulsesoutofBOUT.AvoltagelowerthanVcc/2willproducegreater

than50%dutycyclepulsesoutofAOUT.Ifusinginthedigitalmode,biasthispointat1/2thelogichighlevel.

DISABLE-Istheconnectionfordisablingall4outputswitches.DISABLEhighoverridesallotherinputs.When

takenlow,everythingfunctionsnormally.AninternalpulluptoVccwillkeepDISABLEhighifpinleftopen.

1 2 3 4 5 6 7 8 9 10

ANALOG

GND

Vcc

+Vs

ANALOG

INPUT

POWER

GND

DISABLE

ISENSE A

A OUT

B OUT

ISENSE B

PWM

INPUT

‡ Required RC network. See paragraph

on transient shutdown.

* Protection diodes are recommended for

applications where +Vs exceeds 50V.

‡

SA60

LOAD

12-pin Power SIP

PACKAGE

STYLE DP

FormedLeadsAvailable

SeepackagestyleEE

EXTERNAL CONNECTIONS

SA60

SA60U 5

PWM INPUT-IstheTTLcompatibledigitalinputforcontrollingthePWMpulsewidthofthebridge.Adutycycle

greaterthan50%willproducegreaterthan50%dutycyclepulsesoutoftheAout.Adutycyclelessthan50%

willproducegreaterthan50%dutycyclefromtheBout.Foranaloginputs,theintegrationcapacitorforthe

internalclockmustbeconnectedbetweenthispinandanalogground.Theinternalswitchingfrequencyispro-

grammableupto125kHzbyselectionoftheintegrationcapacitor.Theformulais:

BYPASSING

Adequatebypassingofthepowersuppliesisrequiredforproperoperation.Failuretodosocancauseerraticand

lowefciencyoperation aswellasexcessiveringing attheoutputs.TheVs supplyshouldbebypassed withat

leasta1µFceramiccapacitorinparallelwithanotherlowESRcapacitorofatleast10µFperampofoutputcurrent.

Capacitortypesratedforswitchingapplicationsaretheonlytypes thatshouldbeconsidered.The1µFceramic

capacitormustbephysicallyconnecteddirectlytotheVsandPOWERGNDpins.Evenoneinchofleadlengthwill

causeexcessiveringingattheoutputs.Thisisduetotheveryfastswitchingtimesandtheinductanceofthelead

connection.ThebypassingrequirementsoftheVccsupplyarelessstringent,butstillnecessary.A.1µFto.47µF

ceramiccapacitorconnecteddirectlytotheVccandANALOGGNDpinswillsufce.

PCB LAYOUT

ThedesignerneedstoappreciatethattheSA60combinesinonecircuitbothhighspeedhighpowerswitchingand

lowlevelanalogsignals.Certainlayoutrulesofthumbmustbeconsideredwhenacircuitboardlayoutisdesigned

usingtheSA60:

1. Bypassingofthepowersuppliesiscritical.Capacitorsmustbeconnecteddirectlytothepowersupplypinswith

veryshortleadlengths(wellunder1inch).Ceramicchipcapacitorsarebest.

2. ConnectANALOGGNDtoPOWERGNDwithaconductorhavingnointermediateconnections.ConnectallVs

powersupply,lterandloadrelatedgroundconnectionstoPOWERGNDkeepingtheseconductorsseparate

untilreachingpin6.ConnectallVccpowersupplyandinputsignalrelatedgroundconnectionstoANALOG

GNDkeepingconductorsseparateuntilreachingpin1.Donotallowgroundloopstoformbymakingadditional

groundconnectionsatthelowsideofthephysicalpowersupplies.Ifgroundplaneisuseddonotallowmore

than1mAtoowthroughit.

3. Bewareofcapacitivecouplingbetweenoutputconnectionsandsignalinputsthroughtheparasiticcapacitance

betweenlayersinmultilayerPCBdesigns.

4. Donotrunsmallsignaltracesbetweenthepinsoftheoutputsection(pins8-12).

CURRENT SENSE

Therearetwoloadcurrentsensingpins,ISENSEAandISENSEB.ThetwopinscanbeshortedtoPOWERGND

inthevoltagemodeconnectionbutbothmustbeusedinthecurrentmodeconnection.ItisrecommendedthatR

SENSEresistorsbenon-inductive.LoadcurrentowsintheISENSEpins.TheSA60hasnointernalcurrentlimit.

TRANSIENT SUPPRESSION

AnRCnetworkofa100pFCapacitorandaoneohmresistorisrequiredasshownintheexternalconnectiondia-

gramonpage1.Thisnetworkassuresproperoperationundervariousloads.Minimalpowerisdissipatedinthe

resistor.

– 50

(pF) =

1.44 x10

Fsw

(

)

SA60

6 SA60U

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JUN 2013

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