T#W,Y;-Gp /6l`_$lb6j2ImA)`X6iqqKZ2D2OY{Gz?-GroundR DIODESSWIVDC&COMP'SUM2(SUM2P/ANDGATE0ORGATE1NOTGATE2 NANDGATE4SRFF5JKFFEVSENGONCTRLJCTOPQVVCVSSIVCCS\ICCCS`IDCiTDELAYORGATE3 OP_AMP_2GroundGround A Ae(P@X@A@X@e}oX@}/X@eP?X@(@X@eοX@`}X@e`}X@P?X@e}/X@(`@X@e1<A@1<ezV< NameGroundD hR0 Resistor A A e}tA|AeQmesn#=yFeyF ;@e(+*@@e*s@JA W@eJAP@ rA[-eaN K?@eQ@ȗm(@^@;iY˜ANameRD h Resistance0R Current Flag`- Power Rating1/4W0 Manufacturerm Part No. DIODE0Diode A Ae^@Aee<@<@@ee:^@(<ev~@G>3[@e&@ANameDD hDiode Voltage Drop0$16Initial Position Current Flag`-Voltage RatingPCurrent Rating`M7 Manufacturerm Part No.SSWI0Simple switchpApA e@@e@@A@e@@e@@e@p@Ze@D@*e@@e@@e@h@et*@tt*@@A@@pNameSSD hInitial Position Current Flag`-Voltage RatingPCurrent Rating`M7 Manufacturerm Part No.VDC0DC voltage source AAe@>e Q@uV@@eee` J`@`eAAe̖4iAAANameVDCD h Amplitude100&COMP0 ComparatorAA ezAAec; /p e A|"p AepppAepAptAeppptAedB6e  eDAAed6e enA|A AANameCOMPD h Manufacturerm Part No.'SUM20SummerpApAe`@JY??R-R-@@K"h(A??R-R-@@QOA&??R-R-@@Q3A؆ A??R-R-@@ AA A ANameJKFFD h Manufacturerm Part No.EVSEN0Voltage sensorAA epppsvAe A$q Ae < Yp ezAAepp e :1AeApvAe @ @@e @rAepA @@enA|Aoͯo͟h/r AANameVSEND hGain1A"0 Manufacturerm Part No.GONCTRL0On-off switch controller p ApAe@@@@e>@@e@pAepe@@@e@pApNameOND hJCTOP0!Control-to-power interface block A Ae4t`@ep@2eBJAr(Aev )3e2@Aeˊ5Ab@mJAߢ AeH~6A IA5egIA'[gIAf Aet AhIA Ae4A4A%@e4 4@/?~>??R-R-@@e4@4A@e44AC2`??R-XR-@X@P:@h/!@??R-XR-@X@ANameCTOPD hQVVCVS0"Voltage-controlled voltage sourceppAAe\\A \Ae446?eZpype(@@@@e@@ e8@@e@nA@Ae@@nep A@ Aep @ e@p^Ae\A@pAep@pAe@p@@Ap p ANameVVCVSD hGain1A"0SIVCCS0"Voltage-controlled current sourceppAAeO@@eX@@e@@@e@pxep@pAe\A@pAe@p^Aep @ ep A@ Ae@@ne@nA@Ae{6p,!pe_d=_dIAe0=N`A`N`A@@Ap p ANameIVCCSD hGain1A"0\ICCCS0"Current-controlled current sourceppAAeF<&X%@6eF+g4eHH@e@nA@Ae@@nep A@ Aep @ e@p^Ae^A@pAep@pAe@nx>e@@@e@@@@e@ @ e@@@@Ap Ap NameICCCSD hGain1A"0`IDC0DC current source AA AAeeAAe>>@eXe`@>ANameIDCD h Amplitude100iTDELAY0Time delay block A Ae p@p@e `@ p@ep@p@e Ap@6Ap@e@@he he@p@Ap@e@@@p@e@@?e@ @eh@@e @ x@e ?e esle!~AAe4p@p@ex@e?e??@e?p@@p@e[ A2A Ae~҃Ar~҃A AznbrrAP AesAp AA Aenp AYZ AesASATe Dۿm =enL=?ANameTDD h Time Delay0.0010ORGATE30OR gate (3-input)AA ep  -hjA- @fAjA-A^AA^AeAAe?fx@fees,RjAa@,RjAepf@f-@l@le f e] A AeX)C??GD hON2AC B4CAC??/D hR4R10k`--01/4Wm|w4BCfBx##C`?bBC??10k Courier NewM6}7M6A}7AM6AR4B AC B??'LWBAx#C B??CLK/LEB Courier New}7A}7AABABACAB??@nCBC CC C?&D hCOMP3mlDCDC@ DC??0D hOR1mmDCDD@ DD??/D hAND1mmDDDD@ D D??/D hAND2mmDC*DC#DC??/D hAND3mmDCDCDC??1D hNOT1mmDC*D D#DD??D hOR31mlD D'DD@!DD??0D hOR2mBDDDDDD??ABD DD DD D?? ABDDDDDD?? ABDDD DD D?? ABDDD DD@D??ppA|;DCHDCADC?4"D hSRFF2PNmm/DC;DC@5DC??/D hAND4mm*DC/DD,DC??1D hNOT2mB*DC/DC,DC?? AB,DC/DC-DC??@B*DD,DD@+DD??@B,DD;DD4DD??AmJDCWDDPDC??D hOR32mn^DCkDDdDC??5D hJKFF1mmuDCDD@{DC??D hOR33mmuDCDC@{DC??D hOR34mmDCDC@DC??1D hNOT3mmDCDC@DC??1D hNOT4m4DCDCDC??}MܙDDC$fDCDC??OUTA Courier New?s}7?sA}7AsA4DCDCDC?? }NܙDDC$fDCDC??OUTB Courier New?s}7?sA}7AsABCCDC@DC??ppABCCC DCD??ABC DD D@D D??ppABDCDCDC??@BDCDDDD?? BBDDDDDD??@BDCDCDC?? A BDCDDDC??AB DDDDDD?? AuCDLD5D˝ChD??PWM_IN Courier NewM}7MA}7AMABDDJDD@0DD??BB%DDDDD D??An3C DCDCD??&D hCOMP4mp6C DCDC@ D??(0D hSUMP1a1a1d8C DCDC D??$D hVDC61.25}JkCD!CdDCD??1.25 Courier New?s}7?sA}7A@sA8B?CDCDC@D??@B@zCDCDCD??B|AHCDzCDaCD??E"D hVSEN3A"01m4DD AD D??!}O "D~$@D D??RAMP Courier New?s}7?sA}7A@sAD|ECDC"DCD??E"D hVSEN4A"01m4D AD D??)~Ph"DAD D??EAOUT Courier Newh}7hA}7AhA4%D A*D 'D??+{QČ"w%Dވ)D 'D??NI Courier New?}7?@}7A@@4*D A/D ,D??-|R&"w*Dm?ވ.D ,D??INV Courier NewM6}7M6A}7AM6AcfC9DCCDuC>D?Q#D hVVCVS2A"01zC";D$C@DC>D??1 Courier New?s}7?s@}7As@A"0fC*DzC6DpC@0D? ;D hD6$160`-6P`M7mBpCCDpCEDpC@DD??@nCWDCaDC\D??&D hCOMP5mnChDCrDCmD??&D hCOMP6mnCzDCDCD??&D hCOMP7mczCmDCrDCpD??#D hVDC81.2|$zCCpDTCuDCrD??1.2 Courier NewM6}7M6A}7AM6ABfCYDfCkDfC@bD?? B|4CTDfC^DMCYD??E"D hVSEN5A"01m|RCwDCDkC|D??E"D hVSEN6A"01mBBzDRCzD CzD??HBH4MD ARD OD??{SČ"wMDވQD OD??SS Courier New?}7?@}7A@@4TD AYD WD??}T "TD~$@YD WD??ILIM Courier New?s}7?sA}7A@sABDDD\DD@5D??C|*|C^SDaECNVDޕC+UD??Current Limit Courier New~E}7~EB}7A~EB{*H|CdDIWCEhDCxfD?? Over Current Courier NewM6}7M6B}7AM6B|BxC]bwD?CzDهC*/yD??Restart Delay Courier New~E}7~EB}7A~EB| DuDDDDzD??4"D hSRFF3PNmmCwD DD@D|D??/D hAND5mmCpDCzDCuD?1D hNOT5mB DpD DwD DsD??pApmC|DCDCD??1D hNOT6mBCpD DpD@DpD??ABCpDCpDCpD?? AlCkDCuDCpD??0D hOR3mBCrDCrDCrD??@B CrDCDC D??\\Bn"DWD/DaD(D\D??&D hCOMP8m|DTD"D^D@DYD??E"D hVSEN7A"01mb D^D%DkD"DdD??"D hVDC105zL&D"bD (DfD'DdD??5 Courier New?s}7?s@}7As@m /DpD;DzD@5DuD??/D hAND6mB"/D\D/DrD/D@gD??44Bl$@DrDMD|DFDwD??0D hOR4mB%;DuD@DuD>DuD?? A B&>DzD@DzD@?DzD??@B)>DzD>DD>DD?? B|.MDuDYDD@SDzD??4"D hSRFF4PNmR0YDTDaDYD@]DWD??GD hON31aDRDhD^DdD@XD.D hSS3`-6P`M7md2cDaDhDmDfD@gD??`$D hIDC2250u}^\D?jDecDDD>DD>DD??AB;DC;DD;DD??ppABHDCJDC@IDC??@B\DC\DC\DC?? AB\DC^DC@]DC??@B\DC^DC@]DC??@BWDCYDC@XDC??@BYDC^DC\DC?? ATCDCDC@D??JD hCTOP1]kD@DpDMDmDFD?? ;D hD9$160`-6P`M7mBkBODCODCOD??CCCBr DD>DD/DD??ppBBvCD>DDDD??**CcHBCBCBC??Q#D hVVCVS4A"03zbB5$CBGC#B5C??3 Courier New?s}7?s@}7A@s@A"0cC\C4CC%CpC?Q#D hVVCVS5A"04z30CgCI7Cx#xC4CpC??4 Courier New?s}7?s@}7A@s@A"0crD@DzDJD@vDED?Q#D hVVCVS6A"06zcyD"wCD zDވGDyDED??6 Courier New?s}7?s@}7As@A"0BzDHDzDMDzDJD?? ABuDMDzDMDwDMD?? ABHBCHBCHBC??@B CC4CC*CC?? ABC DC DC D?? ABpC6DpC9DpC7D??@B\CD\CD\CD??ABHCD\CDRCD?? Ad BDpBDHBD??`$D hIDC4100u}@DBBD A D??100u Courier New?s}7?sA}7A@sABDBDBD?? <D hD12$160`-6P`M7mB HBDBDBD??pApB$BDBDB`D??@eABD CDBD??S%D hIVCCS1A"027m| TC&DC.D C*D??27m Courier NewM6}7M6A}7AM6AAA"0B[CDDDCD??ABqCDDDCD??CBC;DCODCED?? BBDwD/DwD#DwD??44BBD|DMD|D1D|D??BB  CDCDfCD??BbCDD@DCD??"D hVDC134zvCuD_&DSɓDfCĒD??4 Courier New?s}7?s@}7As@cCD4C@DCD??#D hVDC1216{ngCfD"CDǏDCŽD??16 Courier New?}7?@}7A@@czCDCDCD??#D hVDC90.2|"^CoDÙCMDYCބD??0.2 Courier NewM6}7M6A}7AM6ABBODBzDBdD??BB%C@DCDCD??44BB)BC CCBC??ppAB+BC CCBC??ppAU-C DCDC D??D hGroundU0fCmDzCrDpCpD??D hGroundU1fCDzCDpCD??D hGroundU2BDC@DBD??D hGroundU3CDC@DCD??D hGround|4HCBzCCaCC??E"D hVSEN2A"01mU5\C CpC CfCC??D hGroundB>CCCCCC?? BU?CCCCCC??D hGroundbCzC\DCaDC^D??"D hVDC151zIC_DCtcDڐCaD??1 Courier New?s}7?s@}7As@CBGC\DD\DC\D??BUHfC\DzCaDpC^D??D hGroundUK DkD%DpD"DmD??D hGroundbMCCCCCC??"D hVDC161zOLTCþC C%Cp:CiC??1 Courier New?s}7?s@}7As@MUNCCCCCC??D hGroundBP\DC\DD\D@D??ppAUQYDD^DD\DD??D hGroundBRCCCCCC?? BBTfCYDCYDCYD?? BBlHBCBCpBC?? ABpBCBCBC?? BBCCCCCC??ABCCCCCC??@BCCCCCC??@BCCCCCC??ABCCCCCC??ABC CCCCC??99CBBBB CB C??ABB\C C\CC\C??ABC>CCCCC??BBCCCCCC??@BCCCCCC??44BBCCDC@DC??BBDCJDC4DC??BBJDCJDCJDC??BBDCDCDC??BBC CC CC C??BBzCCCCCC??ABBCBCBC?? ABpCDpC*DpC"D??ABCDCDC@D??ABC*DpC*D9C*D??\\BBC;DC;DC;D??BBpCDCDCD??BBDDDDDD?? AB'D D'DD'DD?? A BD D'D D"D D??ABfDMDfDODfD@ND??@BfDaDmDaDiDaD??ppABfDmDmDmDiDmD??ppAB YDWDYDwDYD@gD??BB fDMDmDMDiDMD??ppABfD@DmD@DiD@D??pApBCCCC CC?? AB4CCCCCC?? CB$ DkDDkDDkD??AB& DDDDDD??AB'DODDWDD@SD??pApB(CODDOD DOD??HHBB+C@DCDCD??@B,CDCDCD?? AB-CDC@DCD?? AB5BDBDBD??AB8B@DBDBD??BB9HBDBDBD??ppAB:BDBDBD??AB;BDBDBD??ppAB>CDCDC@D??AB?HCDCDkCD?? BBACDCDCD??ABDC@DC@DC@D??ABJ ACBCpBC??HHBBM A@DB@D4B@D?? BBS AODBODpBOD??HHBBU AWD4CWDBWD??BB^ A'DB'D4B'D?? BB` A,DB,D4B,D?? BBb ADpCDBD??BBd ADHCDBD??BBe ADBD4BD?? BBffD;DuD;DmD;D??ABjfDODfDRDfDPD??@BkfD^DfDaDfD_D??@BnfD;DfD@DfD>D?? ABpuD;DuD@DuD>D?? ABqCDDDCD??ABt ABABAB?? AByABBBBB?? BB{BBHCBCB??44BB~BRCB\CBWC??@BBCBCBC??@BBC CCBC??ppABBC CCBC??pApBBCBCBC??@BB\CBCBC??HHBB C>CC>CC>C??CBBDCD\CD?? CBCmDCmDCmD?? BBfCkDCkDCkD?? BBCDCDCD??\\BBC|DC|DC|D??ABC@DCCDCAD??@BpCCDCCDzCCD?? A BpCEDCEDzCED?? AB CC4CC*CC?? AB4CzC4CC4CC??@8CCDCHDCED??GND|VMC"wCDnCވGDCED??GND Courier NewM6}7M6A}7AM6A8 CDHCD4CD??GND|W%(C"Dd?CD4CD??GND Courier NewM6}7M6A}7AM6A8CDC"DC D??GND|XMC"DnC"DC D??GND Courier NewM6}7M6A}7AM6A8 CYD4C^D C\D??GND|Y%C"YDd+C^D C\D??GND Courier NewM6}7M6A}7AM6A8 DYDD^DD\D??GND|Z&D"YD7D^DD\D??GND Courier NewM6}7M6A}7AM6AB CC CC CC??pApBBC CCCC??AB CCRCC9CC??A8 CC4CC CC??GND|[%CDCd+CC CC??GND Courier NewM6}7M6A}7AM6A8*CCRCC>CC??GND|\%2CDCdICC>CC??GND Courier NewM6}7M6A}7AM6A8 ACHBCAC??GND|](ٔADCl%BCAC??GND Courier NewM6}7M6A}7AM6A84CC\CCHCC??GND|^%CHB4C??GND|_lB+CluBx#CD??GND|c%2C"|DdICoD>CD??GND Courier NewM6}7M6A}7AM6A8 CD4CD C@D??GND|d%C;Dd+CoDD C@D??GND Courier NewM6}7M6A}7AM6A8CDCDCD??GND|eMCDnCoğDCD??GND Courier NewM6}7M6A}7AM6A8mDkDwDpDrDmD??GND|fɦoD"wkD7YuDވoDrDmD??GND Courier NewM6}7M6A}7AM6A8zDJDDODDMD??GND|g&|D"JDDODDMD??GND Courier NewM6}7M6A}7AM6A9CDCDC@D??UVLO}hngC;DCoDDC@D??UVLO Courier New?s}7?sA}7A@sA9 ACHBCAC??UVLO}ilADC4BCAC??UVLO Courier New?s}7?sA}7A@sA94C\C\CpCHCfC??UVLO}j8C]C$1WCx#nCHCfC??UVLO Courier New?s}7?sA}7A@sA9zD@DDEDDCD??UVLO}k3{D"@D$fDEDDCD??UVLO Courier New?s}7?sA}7A sABB@DC@DB@D?? BBC@DCDCD??ABDODfDOD>DOD?? CACBC\BC??1D hR11R0.1m`--01/4WmB ACACAC?? ABBCBCBC??@BACACAC?? ABACBCpBC??A4D@DDD@DD??}lYD{D$&DoD@DD??VREF Courier New?s}7?sA}7AsABD D>D D,D D??BB>D D>DzD>DMD??44CBDDD DDD??ABDDDDDD??ABJDCJDDJD D??HHBB DD DkD DAD??%%CBkDCuDCpDC??ABrDCuDCsDC??@BrDCuDCsDC??@B>D DrD D@XD D??BBpDCuDCrDC?? ABkDCmDC@lDC??@BpDCpDCpDC??ABpDCuDCrDC?? ABrDCrDCrDC??ABmDCmDCmDC?? B B mDCuDC@qDC??ppAB YDCYDCYDC??AB YDCpDCdDC??44B4 DDD@D@DD??}mYDD$&DoD@DD??PGND Courier New?s}7?sA}7AsA 4DDDD@DD??{nLDD3DoċD@DD??VC Courier New?}7?@}7A@BCDDD2DD??CBrDCrD DrDD??BtDycNDnLœD??Note: Courier Newh}7hA}7AhA—D[ϢC=DBjD??<- All functions of the IC are modelled, including the UVLO, Courier New`}7`C}7A`C ?DrDDDbDpD??J or N Package; DW Package Courier News ÖBs CBAr CuHDD}WDRDODp)D??1: INV Courier New}7–B}7BBA7BtHDDTDҮDltNDpD??2: NI Courier New&B&ABA AwHDD\DRDSRDp)D?? 3: EAOUT Courier NewR-–BR-BBAP-ByHDDaDҳDTDpD?? 4: CLK/LEB Courier New&Y–B&YBBA YBtHDDTDRDltNDp)D??5: RT Courier New&B&ABA AtHDDTDҸDltNDpD??6: CT Courier New&B&ABA AvHDDZDRDd QDp)D??7: RAMP Courier Newh–BhBBA`BtHDDTDҽDltNDpD??8: SS Courier New&B&ABA AvkDD}DҽDd tDpD??9: ILIM Courier Newh–BhBBA`BvhDDȒzDRDdqDp)D??10: GND Courier Newh–BhBBA`BwhDD'}DҸDrDpD?? 11: OUTA Courier NewR-–BR-BBAP-Bw hDD'}DRDrDp)D?? 12: PGND Courier NewR-–BR-BBAP-Bu!hDDwDҳD>pDpD??13: VC Courier New}7–B}7BBA7Bw"hDD'}DRDrDp)D?? 14: OUTB Courier NewR-–BR-BBAP-B#@DDЁDDbDpD??DIL-16, SOIC-16 (TOP VIEW) Courier News ÖBs CBAr Cv$hDDȒzDҮDdqDpD??15: VCC Courier Newh–BhBBA`Bw%hDD'}DRDrDp)D?? 16: VREF Courier NewR-–BR-BBAP-B&rDCxDvȽBuD??:- This model applies to UC1825B (Ta = -50 oC to +125 oC), Courier New@|X}7@|XC}7A@|XC'p:¥D9CDVB\D??9- The differences between UCx823A/B and UCx825A/B are: Courier NewT}7TC}7ATC(B«D6B DCAbD??UCx823/x825A: 9.2V / 8.4V Courier Newf}7fB}7AfB)D‚DקBD69D??UCx823/x825B: 16V / 10V Courier New}7B}7AB-XDCaD$@BW]D??;current limiting, leading-edge blanking, soft start, and Courier NewH\}7H\C}7AH\C.6@DCDfCD??DUC2825B (Ta = -40 oC to +85 oC), and UC3825B (Ta = 0 oC to +70 oC). Courier Neww~}7w~C}7Aw~C~/!­RDiBXD`AdUD??UVLO On / Off Courier Newc}7cB}7AcB0xrD|ɤCwDڭBtD??7- A voltage sensor is used to measure the node voltage Courier NewfM}7fMC}7AfMC1" ÍD'?C3D,B`D??7with respect to the IC reference (GND) in many places. Courier NewfM}7fMC}7AfMC2"ÎD9C4D|BaD??:This is needed since the IC reference GND may be floating Courier New@|X}7@|XC}7A@|XC3 -D/ C DD1CD??Kand the power ground is connected elsewhere. Without the voltage sensor, Courier New}7C}7AC46>DCD\>CA\>C78DBD7֖D??- VC and PGND are not used. Courier NewննBAնB8 DܸBJDBFa*DG"B??PSIM Model for UC3825B Courier New}7ÖB}7CBA|7C9B%DC/DB*D??2D hOP_AMP2P5P0m8:B,DC1DC/D??GND|oJ6B",Dd C1DC/D??GND Courier NewM6}7M6A}7AM6A:=.%¶D?C$DjCmD??D- A gounded op. amp. (OP_AMP) can be used for the error amplifier Courier NewCACA(sDCxDFCuD??Eif the IC reference ground is connected to the power circuit ground. Courier New}}CA}C~C^VsB!D.C%D(B3 #D??Error Amplifier Courier Newc}7cB}7AcBbDDCDCDC??i"D hTD7050nbEDCDCDC??i"D hTD8050n|FꅇDzD _D6DDXD??50n Courier NewM6}7M6A}7AM6AE0GD@@CߊDd1ApD?? propagation delay to output. Courier Newy}7yB}7AyBHz~DU DD DD3 D??50 nsec: propagation delay Courier New~}7~B}7A~B