Version 4 SHEET 1 1572 772 WIRE -416 336 -416 288 WIRE -416 480 -416 416 WIRE -272 128 -272 64 WIRE -272 176 -272 128 WIRE -272 288 -416 288 WIRE -272 288 -272 256 WIRE -272 352 -272 288 WIRE -272 480 -272 416 WIRE -144 128 -272 128 WIRE -144 208 -144 128 WIRE -112 288 -272 288 WIRE -112 480 -112 368 WIRE -64 128 -144 128 WIRE -64 208 -144 208 WIRE -64 288 -112 288 WIRE -64 368 -112 368 WIRE 288 288 272 288 WIRE 304 288 288 288 WIRE 320 64 -272 64 WIRE 320 128 272 128 WIRE 320 128 320 64 WIRE 320 368 272 368 WIRE 320 416 320 368 WIRE 336 208 272 208 WIRE 384 288 368 288 WIRE 384 336 384 288 WIRE 528 208 336 208 WIRE 528 256 528 208 WIRE 528 368 528 320 WIRE 624 208 528 208 WIRE 784 208 704 208 WIRE 784 240 784 208 WIRE 784 368 784 304 WIRE 832 208 784 208 WIRE 944 208 832 208 WIRE 944 256 944 208 WIRE 944 416 320 416 WIRE 944 416 944 336 WIRE 944 464 944 416 WIRE 944 560 944 544 WIRE 1088 208 944 208 WIRE 1088 256 1088 208 WIRE 1088 368 1088 336 WIRE 1216 208 1088 208 WIRE 1216 240 1216 208 WIRE 1216 368 1216 320 FLAG -416 480 0 FLAG -272 480 0 FLAG 384 336 0 FLAG 528 368 0 FLAG 784 368 0 FLAG 832 208 Vo FLAG 944 560 0 FLAG 1088 368 0 FLAG -112 480 0 FLAG 288 288 ct FLAG 336 208 swe FLAG -112 288 vdd FLAG 320 368 cinv FLAG 1216 368 0 FLAG 320 64 swc SYMBOL voltage -416 320 R0 WINDOW 123 0 0 Left 0 WINDOW 39 24 132 Left 0 SYMATTR SpiceLine Rser=0.3 SYMATTR InstName V1 SYMATTR Value 25 SYMBOL res -256 272 R180 WINDOW 0 -39 87 Left 0 WINDOW 3 -52 44 Left 0 SYMATTR InstName R1 SYMATTR Value 0.33 SYMBOL cap 304 304 R270 WINDOW 0 32 32 VTop 0 WINDOW 3 0 32 VBottom 0 SYMATTR InstName C2 SYMATTR Value 470p SYMBOL schottky 544 320 R180 WINDOW 0 -34 67 Left 0 WINDOW 3 -86 3 Left 0 SYMATTR InstName D1 SYMATTR Value 1N5819 SYMATTR Description Diode SYMATTR Type diode SYMBOL ind2 608 224 R270 WINDOW 0 32 56 VTop 0 WINDOW 3 4 56 VBottom 0 SYMATTR InstName L1 SYMATTR Value 220µ SYMATTR SpiceLine Rser=0.5 SYMATTR Type ind SYMBOL res 928 240 R0 SYMATTR InstName R2 SYMATTR Value 3.6k SYMBOL res 928 448 R0 SYMATTR InstName R3 SYMATTR Value 1.2k SYMBOL load2 1088 256 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName I1 SYMATTR Value 0.5m SYMBOL res 1200 224 R0 SYMATTR InstName R4 SYMATTR Value 10 SYMBOL polcap 768 240 R0 WINDOW 39 24 113 Left 0 WINDOW 40 24 85 Left 0 SYMATTR SpiceLine Rser=0.1 SYMATTR SpiceLine2 IC=0 SYMATTR InstName C3 SYMATTR Value 220µ SYMBOL polcap -288 352 R0 WINDOW 39 24 113 Left 0 WINDOW 40 24 85 Left 0 SYMATTR SpiceLine Rser=0.1 SYMATTR SpiceLine2 IC=25 SYMATTR InstName C1 SYMATTR Value 220µ SYMBOL EXTRA\\MC\\MC34063 176 224 R0 SYMATTR InstName U1 TEXT -370 -24 Left 0 !.tran 0 2m 1u 100n uic TEXT -368 -72 Left 0 !.inc MC34063.lib TEXT -368 16 Left 0 !.options Gmin=1e-9 method=Gear TEXT -368 -936 Left 0 ;A DC/DC BUCK CONVERTER WITH A MOTOROLA MC34063\nTest circuit and models from Helmut Sennewald 03/14/2004\nThe symbol is from Drew.\n \nDon't remove this copyright notice.\nThe used models are property of ONSEMI and/or Intusoft(www.intusoft.com).\nThey are from ONsemi's webpage and also from the Intusoft's SPICE (ICAP/4 demo 8.3.10).\nThe links are www.onsemi.com and www.intusoft.com .\n \n \nThree of the models have been modified to LTSPICE syntax.\nThe PSPICE model runs without** any modifiacation in LTSPICE.\nSo we have now three models available for the 34063 and one model for the MC33063. \nThe MC34063 model and the MC34063p model have the closest match, but I don't\nknow if they best match the real part.\n \n MC34063 (modified* original model included in ICAP/4 demo)\n MC34063p (original ONsemi PSPICE model) **\n MC34063a (modified* original ONsemi model for ICAP/4 demo)\n MC33063 (modified* original ONsemi model for ICAP/4 demo) \n \n * Means syntax of IF-THEN-ELSE statement adapted to LTSPICE\n All SPICE command lines starting with a comment "*" have been \n changed to be compatible with LTSPICE. \n \n ** This has been possible without modification, because no SW(itch) statement \n has been used. VT and VH of SW are defined differently in PSPICE.\n \nSet the initial conditions of the capacitors C1 and C3 accordingly to your simulation needs.\nThese are the IC=... properties of the filter capacitors in the schematic.