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TextRegion*@UkA{xq @H @Lhttp://www.eecentral.com/qq CharacterMap-RangeMap;www.eecentral.com ChrPropMap7 RangeElem< ChrPropData8 RangeData= w0,0,255 ParPropMap9< ParPropData:@WEmbedMap1<LinkMap/<LinkData0@ NormalArial *@UbRR-$Dual Switch Forward Design Template 7$<$8dArial0,0,2559$<$:@W,1</$<$0@ NormalArial *@Ur00-@This worksheet is used to design a dual switch forward converter. Any parmeter under a heading that is red can be adjusted or needs to be adjusted. Any heading that is green is the result which is located at half-way of this worksheet.7g#8 $<%80,128,0"&<>'8$& 9(<):@W,1*</+<,0@ NormalArial -*@U s-Input/Output Parameters7.</8-d Arial255,0,090<1:@W,12</3<40@ NormalArial 5*@U8+8(-These are the input parameters.796<7:@W,18</9<:0@ NormalArial ;*@U8;K8HLL- Input Voltage7 << =8;255,0,09 >< ?:@W,1@@</ @A< @B0@ NormalArial @CeqRegionB@U8S{fb` @Dtree@ p@E@@ @D@F@@d@EV_min@G@@@E36@H*@USc`-Minimum input voltage (Volts)79@I<@J:@W,1@K</@L<@M0@ NormalArial @N@B@U8k~fx @O@@ p@P@@ @O@Q@@d@PV_nom@R@@@P48@S*@Uk{x-Nominal input voltage (Volts)79@T<@U:@W,1@V</@W<@X0@ NormalArial @Y@B@U8|c @Z@@ p@[@@ @Z@\@@d@[V_max@]@@@[72@^*@U-Maximum input voltage (Volts)79@_<@`:@W,1@a</@b<@c0@ NormalArial @d*@U88 WW-Output Voltage7@e<@f8@d255,0,09@g<@h:@W,1@i</@j<@k0@ NormalArial @l@B@U8}a @m@@ p@n@@ @m@o@@d@nV_out@p@@@n2.5@q*@Umv}}-Output voltage (Volts)79@r<@s:@W,1@t</@u<@v0@ NormalArial @w*@U88UU-Output Current7@x<@y8@w255,0,09@z<@{:@W,1@|</@}<@~0@ NormalArial @@B@U8x_@@@ p@@@ @@@@d@I_max@@@@35@*@U-Maximum output current (Amps)79@<@:@W,1@</@<@0@ NormalArial @@B@U8"Ig8@@@ p@@@ @@@@d@\DI_max@@@@@@@d@I_max@@@@10@*@U+;8-Desired ripple current (Amps)79@<@:@W,1@</@<@0@ NormalArial @*@U8Suc8`==- Frequency7 @< @8@255,0,09 @< @:@W,1@</ @< @0@ NormalArial @@B@U8fy~Ex@@@ p@@@ @@@@d@f@@@@@@@t@250@@@@@@@t@10@@@@3@*@Ukt{x-Desired frequency (Hz)79@<@:@W,1@</@<@0@ NormalArial @*@U88__-Secondary turns7@<@8@255,0,09@<@:@W,1@</@<@0@ NormalArial @@B@U8dQ@@@ p@@@ @@@@d@NS@@@@1@*@U00-@Desired number of secondary turns. Keep in mind for output voltages greater than 5V, it's advisible to user more secondary turns to keep the core area low.79@<@:@W,1@</@<@0@ NormalArial @*@U88OO- Output device7 @< @8@255,0,09 @< @:@W,1@</ @< @0@ NormalArial @@B@U8q@@@ p@@@ @@@@d@V_d_max@@@@.5@*@Ua $qq-@@Output diode or sync. Fet voltage drop plus misc. losses (Volts)7@9@@<@@:@W,1@</@@<@@0@ NormalArial @*@U8#|380DD- Primary Fet7 @< @8@255,0,09 @< @:@W,1@</ @< @0@ NormalArial @@B@U8;NcH@@@ p@@@ @@@@d@Rdson@@@@.010@*@U;KH$-!Rdson on primary side Fets (ohms)7!9!@Maximum turn on gate drive current for primary side Fet (Amps)7>9>A<>A:@W,1A</>A<>A 0@ NormalArial A @B@U8n[A @@ pA @@ A A @@dA IgoffA@@A 3A*@U]$mm-?Maximum turn off gate drive current for primary side Fet (Amps)7?9?A*@U$-Maximum core loss in mW/cm^279A?<A@:@W,1AA</AB<AC0@ NormalArial AD@B@U8pK:AE@@ pAF@@ AEAG@@dAFurAH@@AF2300AI*@U;$-%Relative perm. of Mag Inc. R material7%9%AJ<%AK:@W,1AL</%AM<%AN0@ NormalArial AO@B@U8M=AP@@ pAQ@@ APAR@@dAQu0AS@@AQAT@@@ASAU@@tAT4AV@@AT\pAW@@ASAX@@tAW10AY@@KAWAZ@@AY7A[*@UA?qq-Perm. of free space79A\<A]:@W,1A^</A_<A`0@ NormalArial Aa@B@U8V&C Ab@@ pAc@@ AbAd@@dAciAe@@Ac3Af*@U# $-+Min, Nom and Max input voltage calculations7+9+Ag<+Ah:@W,1Ai</+Aj<+Ak0@ NormalArial Al*@U9LH-Calculated Constants7Am<An8Ald Arial0,0,2559Ao<Ap:@W,1Aq</Ar<As0@ NormalArial At*@U8cs8p-@KMaximum flux density calculation as a function of frequency for R material 7K9KAuA{@@ pA|@@ A{A}@@@A|A~@@dA}P_lossA@@pA}A@@ AA@@dAfA@@AbA@@A|A@@@AA@@tA0.008A@@AA@@p@AA@@AA@@dAfA@@A1000A@@A1.979A@@AA@@p@AA@@AA@@dAbA@@A1000A@@A2.628A*@UHHw::-mW/cm^279A<A:@W,1A</A<A0@ NormalArial A@B@U@tOA@@ pA@@ AA@@dAbA@@A1000A@B@U@kA@@ pA@@ AA@@dAB_maxA@@AA@@dArootA@@pAA@@ AA@@@AA@@@AA@@dAP_lossA@@pAA@@ AA@@dAfA@@AbA@@A100A@@AbA@B@U@.j(A@@ pA@@AA@@dAB_maxA@@AA@@+@ASerial_DisplayNodeXA@@A _n_u_l_l_A*@U+( -Maximum flux density in gauss79A<A:@W,1A</A<A0@ NormalArial A*@U8CS8P-Setup for input voltage79A<A:@W,1A</A<A0@ NormalArial A@B@U@k\xA@@ pA@@ AA@@@AA@@dAVbA@@A1A@@AV_minA@B@Uk7xA@@ pA@@ AA@@@AA@@dAVbA@@A2A@@AV_nomA@B@UkxA@@ pA@@ AA@@@AA@@dAVbA@@A3A@@AV_maxA*@U88 ^^-Loop calculation79A<A:@W,1A</A<A0@ NormalArial A@B@UHvS A@@ pA@@ AA@@dAiA@@AA@@tA1A@@A3A*@U88--New maximum duty cycle79A<A:@W,1A</A<A0@ NormalArial A@B@U8h/A@@ pA@@ AA@@dAtsw_onA@@AA@@dAQgdA@@AIgonA@B@U&A@@ pA@@ AA@@dAtsw_offA@@AA@@dAQgdA@@AIgoffA*@Up# p8-Approximate switching time (s)79A<A:@W1A</A<A0@ NormalArial A@B@U8&>g8A@@ pA@@AB@@dAtsw_onB@@AB@@+@B@XB@@BB@B@U&_> 8B@@ pB@@BB@@dBtsw_offB@@BB @@+@B@XB @@BB @B@U8^Od5B @@ pB @@ B B@@dB D_maxB@@B B@@dBD_maxB@@pBB@@BB@@tB1B@@pBB@@BB@@@BB@@@BB@@@BB@@tB2B@@BfB@@Btsw_onB@@Btsw_offB@@pBB@@BB@@tB2B @@BfB!@B@U{6B"@@ pB#@@B"B$@@dB#D_maxB%@@B#B&@@+@B%@XB'@@B% _n_u_l_l_B(*@U{nvv-New max duty cycle79B)<B*:@W1B+</B,<B-0@ NormalArial B.*@U  -Transformer Ratio 7B/<B08B.d Arial0,0,255B1<B28B.l Arial0,0,255B/B1B/9B3<B4:@W,1B5</B6<B70@ NormalArial B8*@U8+v;88>>-6Calculates transformer ratio based on single secondary7696B9<6B::@W,1B;</6B<<6B=0@ NormalArial B>@B@U8`x B?@@ pB@@@,B?BA@@@B@BB@@@BABC@@@BBBD@@dBCVbBE@@BC1BF@@BBD_maxBG@@BANBH@@B@BI@@dBHV_outBJ@@BHV_d_maxBK@B@U8JBL@@ pBM@@ BLBN@@dBMNBO@@BMBP@@K@BOBQ@@BPBR@@dBQVbBS@@BQ1BT@@BOBU@@dBTD_maxBV@@pBTBW@@BVBX@@K@BWBY@@BXV_outBZ@@BWV_d_maxB[@B@U8rIB\@@ pB]@@B\B^@@dB]NB_@@B]B`@@+@B_@XBa@@B_ _n_u_l_l_Bb*@U<-,This is the transformer ratio that is needed7,9,Bc<,Bd:@W,1Be</,Bf<,Bg0@ NormalArial Bh@B@U8  Q Bi@@ pBj@@ BiBk@@dBjNPBl@@BjBm@@dBlifBn@@pBlBo@@ BnBp@@ @BoBq@@)@BpBr@@@BqBs@@@BrBt@@dBsNSBu@@BsNBv@@BrBw@@dBvfloorBx@@pBvBy@@BxBz@@dByNSB{@@ByNB|@@Bq0.5B}@@BpB~@@dB}floorB@@pB}B@@BB@@dBNSB@@BNB@@BoB@@dBceilB@@pBB@@BB@@dBNSB@@BNB@B@U8* lQ J@ B@@ pB@@ BB@@dBNB@@BB@@dBNPB@@BNSB@B@U3 F @ B@@ pB@@BB@@dBNB@@BB@@+@B@XB@@BB*@U3 C @ 8-*Transformer ratio based on secondary turns7*9*B<*B:@W1B</*B<*B0@ NormalArial B*@Ua t p -Duty-cycle Calculations7B<B8Bd Arial0,0,2559B<B:@W,1B</B<B0@ NormalArial B@B@U8  B@@ pB@@,BB@@@BB@@@BB@@dBV_nomB@@BD_nomB@@BNB@@BB@@dBV_outB@@BV_d_maxB@B@U8 L B@@ pB@@ BB@@@BB@@dBDB@@BiB@@BB@@@BB@@K@BB@@B1B@@BB@@p@BB@@BB@@K@BB@@BV_outB@@BV_d_maxB@@BB@@dBVbB@@BiB@@BNB@B@U   B@@ pB@@ BB@@@BB@@dBtonB@@BiB@@BB@@@BB@@dBDB@@BiB@@BfB@B@U8 wd = B@@ pB@@BB@@@BB@@dBDB@@BiB@@BB@@@BB@@@BB@@BB@@<@BB CVSEqItem EqItem BBB CVSComboItemCVSItem< : *=CVSOleClientItem ࡱ> Root EntryaB.dK8&'@Contents( WN )di2 i`xArial~~Arial|||w<T1c$E$" h   . B@@B1@XB@@BB*@U b+ ( -#Duty-cycle at minimum input voltage7#9#B<#B:@W,1B</#B<#B0@ NormalArial B*@U3 ZC @ -#Duty-cycle at nominal input voltage7#9#B<#B:@W,1B</#B<#B0@ NormalArial B*@UK f[ X -#Duty-cycle at maximum input voltage7#9#B<#B:@W,1B</#B<#B0@ NormalArial B*@U t  ll-,Minimum core area and magnetizing inductance7,B<,B8Bd Arial0,0,2559,B<,B:@W,1B</,B<,B0@ NormalArial B*@U8 p 8 188- Core area7 9 B< B:@W,1B</ B< B0@ NormalArial B@B@U8 P B@@ pC@@ BC@@dCAeC@@CC@@@CC@@@CC@@dCV_nomC@@CC@@dCtonC@@C2C @@CC @@tC 10C @@C 8C @@CC @@@C C@@tC 2C@@C B_maxC@@C NPC@B@U . C@@ pC@@CC@@dCAeC@@CC@@+@C@XC@@CC*@U@ ^ @ -cm^279C<C:@W1C</C<C0@ NormalArial C*@U8# w3 80 A??- Inductance7 9 C< C :@W,1C!</ C"< C#0@ NormalArial C$@B@U8K y^ LX 2C%@@ pC&@@ C%C'@@dC&lmC(@@C&C)@@tC(10C*@@C(AeC+*@UK [ X P-cm79C,<C-:@W1C.</C/<C00@ NormalArial C1*@UK [ X 3-)Guess what the mean length of the core is7)9)C2<)C3:@W,1C4</)C5<)C60@ NormalArial C7@B@U8u d BC8@@ pC9@@ C8C:@@dC9L_magC;@@C9C<@@@C;C=@@@C@@@C=C?@@@C>C@@@dC?urCA@@C?u0CB@@C>CC@@dCBNPCD@@CB2CE@@C=AeCF@@C  \l-Peak current per device (Amps)79C~<C:@W,1C</C<C0@ NormalArial C@B@U8 l fC@@ pC@@ CC@@@CC@@dCI_d1_IaC@@CiC@@CC@@dCI_maxC@@pCC@@CC@@dCDC@@CiC*@U s  ^l-(Average current in forward device (Amps)7(9(C<(C:@W,1C</(C<(C0@ NormalArial C@B@U8 l @C@@ pC@@ CC@@@CC@@dCI_d2_IaC@@CiC@@CC@@dCI_maxC@@pCC@@CC@@tC1C@@CC@@dCDC@@CiC*@U   Al  --Average current in freewheeling device (Amps)7-9-C<-C:@W,1C</-C<-C0@ NormalArial C*@U! 4 0 "-Output Inductance 7C<C8Cd Arial0,0,2559C<C:@W,1C</C<C0@ NormalArial C@B@U@T + g TC@@ pC@@ CC@@dCL_indC@@CC@@p@CC@@CC@@@CC@@@CC@@@CC@@@CC@@dCVbC@@C2C@@CNC@@CV_d_maxC@@CV_outC@@C\DI_maxC@@CC@@dCtonC@@C2C@B@UHn  n C@@ pC@@CC@@dCL_indC@@CC@@+@C@XC@@C _n_u_l_l_C*@Us   )   -@LOutput inductance. Over ride this value if using an "off the shelf" part (H)7L9LC Root EntryaB.dK8 &'@Contents( N "di2 ixArial~~Arial|||w<T1c$D@@D1@XD@@DD*@U---4Input ripple current at minimum input voltage (Amps)7494D <4D!:@W,1D"</4D#<4D$0@ NormalArial D%*@U%%-4Input ripple current at nominal input voltage (Amps)7494D&<4D':@W,1D(</4D)<4D*0@ NormalArial D+*@U11-4Input ripple current at maximum input voltage (Amps)7494D,<4D-:@W,1D.</4D/<4D00@ NormalArial D1*@U -Current Calculations7D2<D38D1d Arial0,0,2559D4<D5:@W,1D6</D7<D80@ NormalArial D9*@U0O+0(-3Primary Ripple current reflect from output inductor7393D:<3D;:@W,1D<</3D=<3D>0@ NormalArial D?@B@U8?i_X)D@@@ pDA@@ D@DB@@@DADC@@dDBI_indDD@@DBiDE@@DADF@@@DEDG@@dDF\DIDH@@DFiDI@@DENDJ*@UK[X8**-(Amps)79DK<DL:@W1DM</DN<DO0@ NormalArial DP*@U00UU-9Maximum primary ripple current due to magnetizing current7999DQ<9DR:@W,1DS</9DT<9DU0@ NormalArial DV@B@U8d2DW@@ pDX@@ 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