Version 4 SHEET 1 2228 772 WIRE 464 -80 -288 -80 WIRE 592 -80 464 -80 WIRE 736 -80 592 -80 WIRE 592 -64 592 -80 WIRE 464 -48 464 -80 WIRE 736 32 736 -80 WIRE 992 32 736 32 WIRE 992 48 992 32 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 944 64 784 64 WIRE 672 112 592 112 WIRE 784 112 784 64 WIRE 784 112 752 112 WIRE -160 128 -160 64 WIRE -112 128 -160 128 WIRE 272 128 272 64 WIRE 272 128 224 128 WIRE 1056 144 992 144 WIRE 1200 144 1136 144 WIRE 1392 144 1200 144 WIRE 1536 144 1392 144 WIRE 1664 144 1536 144 WIRE -288 160 -288 -80 WIRE -192 160 -288 160 WIRE 992 176 992 144 WIRE 1664 176 1664 144 WIRE -288 192 -288 160 WIRE 992 192 992 176 WIRE 1200 192 1200 144 WIRE 1392 192 1392 144 WIRE -192 208 -192 160 WIRE -112 208 -192 208 WIRE 336 208 224 208 WIRE 336 240 336 208 WIRE 592 272 592 112 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 992 288 992 240 WIRE 1200 304 1200 256 WIRE 1664 304 1664 256 WIRE 336 320 336 288 WIRE -480 336 -480 288 WIRE -288 352 -288 288 WIRE -112 368 -160 368 WIRE 1392 368 1392 272 WIRE 1392 368 224 368 WIRE 1392 400 1392 368 WIRE -480 464 -480 416 WIRE -288 464 -288 416 WIRE -160 464 -160 368 WIRE 1392 496 1392 480 FLAG -480 464 0 FLAG -288 464 0 FLAG 336 320 0 FLAG 992 288 0 FLAG 1200 304 0 FLAG 1536 144 Vo FLAG 1392 496 0 FLAG -160 464 0 FLAG 1664 304 0 FLAG 336 240 0 FLAG 592 272 0 SYMBOL voltage -480 320 R0 WINDOW 123 0 0 Left 2 WINDOW 39 24 132 Left 2 SYMATTR SpiceLine Rser=0.0 SYMATTR InstName V1 SYMATTR Value 24 SYMBOL res -272 288 R180 WINDOW 0 -39 87 Left 2 WINDOW 3 -52 44 Left 2 SYMATTR InstName R1 SYMATTR Value 0.005 SYMBOL cap 256 304 R270 WINDOW 0 32 32 VTop 2 WINDOW 3 0 32 VBottom 2 SYMATTR InstName C2 SYMATTR Value 56p SYMBOL schottky 1008 240 R180 WINDOW 0 -34 67 Left 2 WINDOW 3 -111 -7 Left 2 SYMATTR InstName D1 SYMATTR Value MBRS340 SYMATTR Description Diode SYMATTR Type diode SYMBOL ind2 1040 160 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 4 56 VBottom 2 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 1376 176 R0 SYMATTR InstName R2 SYMATTR Value 6k SYMBOL res 1376 384 R0 SYMATTR InstName R3 SYMATTR Value 500 SYMBOL res 1648 160 R0 SYMATTR InstName R4 SYMATTR Value .7 SYMBOL polcap -304 352 R0 WINDOW 39 24 86 Left 2 WINDOW 40 24 85 Left 2 SYMATTR SpiceLine Rser=0.1 SYMATTR InstName C1 SYMATTR Value 470µ SYMBOL res 448 48 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R5 SYMATTR Value 100 SYMBOL res 448 -64 R0 SYMATTR InstName R6 SYMATTR Value 100 SYMBOL cap 1184 192 R0 WINDOW 39 24 92 Left 2 SYMATTR SpiceLine Rser=0.02 SYMATTR InstName C3 SYMATTR Value 1000µ SYMBOL SmpsAdd\\mc34063 128 224 R0 SYMATTR InstName U2 SYMATTR SpiceModel mc34063a SYMBOL res 576 -80 R0 SYMATTR InstName R7 SYMATTR Value 1k SYMBOL 1JPS\ ITEMS\\IRF4905 944 144 M180 SYMATTR InstName U1 SYMBOL res 768 96 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R8 SYMATTR Value 1k SYMBOL npn 528 16 R0 SYMATTR InstName Q2 TEXT -472 -320 Left 2 !.tran 0 15m 0 100n TEXT -472 -248 Left 2 ;.options Gmin=1e-9 method=Gear TEXT -472 -216 Left 2 ;.options plotwinsize=0 TEXT -472 -600 Left 2 ;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 2 !.IC V(Vo)=12 TEXT -304 -288 Left 2 ;Preset Vo for shorter simulation time