Version 4 SHEET 1 2228 772 WIRE 464 -80 -288 -80 WIRE 592 -80 464 -80 WIRE 464 -48 464 -80 WIRE 592 16 592 -80 WIRE 272 64 -160 64 WIRE 352 64 272 64 WIRE 464 64 464 32 WIRE 464 64 432 64 WIRE 528 64 464 64 WIRE -160 128 -160 64 WIRE -112 128 -160 128 WIRE 272 128 272 64 WIRE 272 128 224 128 WIRE 592 144 592 112 WIRE 656 144 592 144 WIRE 800 144 736 144 WIRE 992 144 800 144 WIRE 1136 144 992 144 WIRE 1264 144 1136 144 WIRE -288 160 -288 -80 WIRE -192 160 -288 160 WIRE 1264 176 1264 144 WIRE -288 192 -288 160 WIRE 592 192 592 144 WIRE 800 192 800 144 WIRE 992 192 992 144 WIRE 1136 192 1136 144 WIRE -192 208 -192 160 WIRE -112 208 -192 208 WIRE 336 208 224 208 WIRE 336 240 336 208 WIRE -288 288 -288 272 WIRE -288 288 -480 288 WIRE -112 288 -288 288 WIRE 256 288 224 288 WIRE 336 288 320 288 WIRE 592 304 592 256 WIRE 800 304 800 256 WIRE 1136 304 1136 272 WIRE 1264 304 1264 256 WIRE 336 320 336 288 WIRE -480 336 -480 288 WIRE -288 352 -288 288 WIRE -112 368 -160 368 WIRE 992 368 992 272 WIRE 992 368 224 368 WIRE 992 400 992 368 WIRE -480 464 -480 416 WIRE -288 464 -288 416 WIRE -160 464 -160 368 WIRE 992 496 992 480 FLAG -480 464 0 FLAG -288 464 0 FLAG 336 320 0 FLAG 592 304 0 FLAG 800 304 0 FLAG 1136 144 Vo FLAG 992 496 0 FLAG 1136 304 0 FLAG -160 464 0 FLAG 1264 304 0 FLAG 336 240 0 SYMBOL voltage -480 320 R0 WINDOW 123 0 0 Left 0 WINDOW 39 24 132 Left 0 SYMATTR SpiceLine Rser=0.1 SYMATTR InstName V1 SYMATTR Value 12 SYMBOL res -272 288 R180 WINDOW 0 -39 87 Left 0 WINDOW 3 -52 44 Left 0 SYMATTR InstName R1 SYMATTR Value 0.5 SYMBOL cap 256 304 R270 WINDOW 0 32 32 VTop 0 WINDOW 3 0 32 VBottom 0 SYMATTR InstName C2 SYMATTR Value 56p SYMBOL schottky 608 256 R180 WINDOW 0 -34 67 Left 0 WINDOW 3 -111 -7 Left 0 SYMATTR InstName D1 SYMATTR Value MBRS340 SYMATTR Description Diode SYMATTR Type diode SYMBOL ind2 640 160 R270 WINDOW 0 32 56 VTop 0 WINDOW 3 4 56 VBottom 0 SYMATTR InstName L1 SYMATTR Value 27µ SYMATTR SpiceLine Ipk=1.76 Rser=0.11 Rpar=36000 Cpar=4.72p mfg="Wurth Elektronik eiSos" pn="744 776 127" SYMATTR Type ind SYMBOL res 976 176 R0 SYMATTR InstName R2 SYMATTR Value 3.3k SYMBOL res 976 384 R0 SYMATTR InstName R3 SYMATTR Value 2.2k SYMBOL load2 1136 192 R0 WINDOW 39 22 87 Left 0 WINDOW 3 19 153 Left 0 WINDOW 123 0 0 Left 0 SYMATTR SpiceLine load SYMATTR Value PWL(0 0 1u 1 6m 1 6.01m 0.5 7m 0.5 7.01m 1) SYMATTR InstName I1 SYMBOL res 1248 160 R0 SYMATTR InstName R4 SYMATTR Value 500 SYMBOL polcap -304 352 R0 WINDOW 39 24 86 Left 0 WINDOW 40 24 85 Left 0 SYMATTR SpiceLine Rser=0.1 SYMATTR InstName C1 SYMATTR Value 470µ SYMBOL res 448 48 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R5 SYMATTR Value 100 SYMBOL res 448 -64 R0 SYMATTR InstName R6 SYMATTR Value 100 SYMBOL cap 784 192 R0 WINDOW 39 24 92 Left 0 SYMATTR SpiceLine Rser=0.02 SYMATTR InstName C3 SYMATTR Value 470µ SYMBOL pnp 528 112 M180 SYMATTR InstName Q1 SYMATTR Value FZT1147A SYMBOL SmpsAdd\\mc34063 128 224 R0 SYMATTR InstName U2 SYMATTR SpiceModel mc34063a TEXT -472 -320 Left 0 !.tran 0 8.0m 1u 100n TEXT -472 -248 Left 0 ;.options Gmin=1e-9 method=Gear TEXT 808 -640 Left 0 !*Zetex FZT1147A Spice Model v1.0 Last Revised 10/12/96\n*\n.MODEL FZT1147A PNP IS=1.272e-12 NF=0.989 ISE=2.5e-13 NE=1.65 BF=500 \n+ VAF=14.59 IKF=8 NR=1 ISC=8e-14 NC= 1.6 BR=90 VAR=3.1\n+ IKR=1.2 RE=15e-3 RB=145e-3 RC=13e-3 CJE=560e-12\n+ CJC=255e-12 VJC=0.6288 MJC=0.4048 TF=1.2e-9 TR=13e-9\n*\n*$\n*\n* (c) 2005 Zetex Semiconductors plc\n*\n* The copyright in these models and the designs embodied belong\n* to Zetex Semiconductors plc (" Zetex "). They are supplied\n* free of charge by Zetex for the purpose of research and design\n* and may be used or copied intact (including this notice) for\n* that purpose only. All other rights are reserved. The models\n* are believed accurate but no condition or warranty as to their\n* merchantability or fitness for purpose is given and no liability\n* in respect of any use is accepted by Zetex PLC, its distributors\n* or agents.\n*\n* Zetex Semiconductors plc, Zetex Technology Park, Chadderton,\n* Oldham, United Kingdom, OL9 9LL TEXT -472 -216 Left 0 ;.options plotwinsize=0 TEXT -472 -600 Left 0 ;MC34063A WIth An External PNP-Transistor\n===================================\n \nWatch the higher ripple current through inductor L1 if Iload=0.5A.\n \nThe external PNP transistor must be a special switching transistor.\n \nThe option "load" has to be used for the load current sink I1. TEXT -472 -288 Left 0 ;.IC V(Vo)=3 TEXT -304 -288 Left 0 ;Preset Vo for shorter simulation time