Version 4
SHEET 1 1388 708
WIRE -512 208 -512 -176
WIRE -512 672 -512 288
WIRE -352 80 -352 16
WIRE -352 208 -352 160
WIRE -352 272 -352 208
WIRE -352 672 -512 672
WIRE -352 672 -352 352
WIRE -304 16 -352 16
WIRE -224 208 -352 208
WIRE -224 240 -224 208
WIRE -224 352 -224 320
WIRE -224 448 -224 416
WIRE -224 560 -224 528
WIRE -224 576 -224 560
WIRE -224 672 -352 672
WIRE -224 672 -224 640
WIRE -192 -176 -512 -176
WIRE -128 208 -224 208
WIRE -128 240 -128 208
WIRE -128 352 -224 352
WIRE -128 352 -128 304
WIRE -128 560 -224 560
WIRE -128 560 -128 480
WIRE -64 208 -128 208
WIRE -64 288 -64 208
WIRE -32 -176 -112 -176
WIRE -32 -112 -32 -176
WIRE -32 -16 -32 -48
WIRE -32 288 -64 288
WIRE -32 352 -128 352
WIRE -32 416 -224 416
WIRE -32 480 -128 480
WIRE 48 -176 -32 -176
WIRE 128 -176 48 -176
WIRE 128 -112 128 -176
WIRE 128 64 128 -32
WIRE 128 224 128 64
WIRE 128 672 -224 672
WIRE 128 672 128 544
WIRE 128 688 128 672
WIRE 192 64 128 64
WIRE 240 64 192 64
WIRE 240 64 240 -96
WIRE 304 -176 128 -176
WIRE 304 192 304 -176
WIRE 352 448 288 448
WIRE 352 512 352 448
WIRE 368 -96 240 -96
WIRE 368 -48 368 -96
WIRE 368 64 368 16
WIRE 368 192 304 192
WIRE 368 320 288 320
WIRE 432 -96 368 -96
WIRE 432 320 368 320
WIRE 432 352 432 320
WIRE 432 432 432 416
WIRE 464 192 432 192
WIRE 464 512 352 512
WIRE 528 320 432 320
WIRE 528 512 464 512
WIRE 528 560 528 512
WIRE 528 672 128 672
WIRE 528 672 528 624
WIRE 592 512 528 512
WIRE 624 -96 496 -96
WIRE 624 -48 624 -96
WIRE 624 64 368 64
WIRE 624 64 624 32
WIRE 624 128 624 64
WIRE 624 320 608 320
WIRE 656 320 624 320
WIRE 704 512 672 512
WIRE 736 -176 304 -176
WIRE 736 -48 736 -176
WIRE 736 192 544 192
WIRE 736 192 736 32
WIRE 736 272 736 192
WIRE 736 512 704 512
WIRE 736 512 736 368
WIRE 736 544 736 512
WIRE 736 672 528 672
WIRE 736 672 736 624
WIRE 784 192 736 192
WIRE 848 -48 848 -96
WIRE 848 64 848 32
WIRE 848 128 848 64
WIRE 960 -96 848 -96
WIRE 1088 -96 1024 -96
WIRE 1088 -48 1088 -96
WIRE 1088 64 848 64
WIRE 1088 64 1088 16
WIRE 1248 -96 1088 -96
WIRE 1248 -48 1248 -96
WIRE 1248 64 1088 64
WIRE 1248 64 1248 32
WIRE 1280 -96 1248 -96
FLAG 128 688 0
FLAG 432 432 0
FLAG -32 -16 0
FLAG 624 128 0
FLAG 848 128 0
FLAG 784 192 vd
FLAG 1280 -96 V12
IOPIN 1280 -96 Out
FLAG -304 16 v12
IOPIN -304 16 In
FLAG 624 320 vg
FLAG 368 320 vgo
FLAG 464 512 vsi
FLAG 704 512 vs
FLAG 192 64 vcc
FLAG 48 -176 v180f
FLAG -512 -176 v180
SYMBOL res -240 432 R0
SYMATTR InstName R1
SYMATTR Value 10k
SYMBOL res -368 64 R0
SYMATTR InstName R2
SYMATTR Value 18k
SYMBOL res -368 256 R0
SYMATTR InstName R3
SYMATTR Value 4.7k
SYMBOL res 688 496 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R4
SYMATTR Value 1k
SYMBOL cap -240 576 R0
SYMATTR InstName C1
SYMATTR Value 4.7n
SYMBOL cap -144 240 R0
WINDOW 0 32 0 Left 0
SYMATTR InstName C2
SYMATTR Value 100p
SYMBOL res -240 224 R0
SYMATTR InstName R5
SYMATTR Value 150k
SYMBOL res 720 528 R0
SYMATTR InstName R6
SYMATTR Value 0.33
SYMBOL cap 512 560 R0
SYMATTR InstName C3
SYMATTR Value 470p
SYMBOL res 624 304 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R7
SYMATTR Value 22
SYMBOL schottky 448 416 R180
WINDOW 0 -32 64 Left 0
WINDOW 3 -80 2 Left 0
SYMATTR InstName D1
SYMATTR Value 1N5819
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL res 112 -128 R0
SYMATTR InstName R8
SYMATTR Value 56k
SYMBOL cap -48 -112 R0
WINDOW 3 48 38 Left 0
WINDOW 39 27 65 Left 0
SYMATTR Value 220µ
SYMATTR SpiceLine Rser=0.1
SYMATTR InstName C4
SYMBOL ind2 720 -64 R0
WINDOW 0 44 31 Left 0
WINDOW 3 44 76 Left 0
WINDOW 39 23 121 Left 0
SYMATTR InstName L1
SYMATTR Value 1m
SYMATTR SpiceLine Rser=0.1
SYMATTR Type ind
SYMBOL ind2 608 48 M180
WINDOW 0 46 82 Left 0
WINDOW 3 48 40 Left 0
WINDOW 39 28 -8 Left 0
SYMATTR InstName L2
SYMATTR Value 50µ
SYMATTR SpiceLine Rser=0.1
SYMATTR Type ind
SYMBOL schottky 496 -112 R90
WINDOW 0 0 32 VBottom 0
WINDOW 3 32 32 VTop 0
SYMATTR InstName D2
SYMATTR Value 1N5819
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL cap 352 -48 R0
WINDOW 3 46 35 Left 0
WINDOW 39 33 64 Left 0
SYMATTR Value 100µ
SYMATTR SpiceLine Rser=0.1
SYMATTR InstName C5
SYMBOL ind2 864 48 R180
WINDOW 0 -32 80 Left 0
WINDOW 3 -43 38 Left 0
WINDOW 39 -113 6 Left 0
SYMATTR InstName L3
SYMATTR Value 70µ
SYMATTR SpiceLine Rser=0.02
SYMATTR Type ind
SYMBOL schottky 960 -80 R270
WINDOW 0 32 32 VTop 0
WINDOW 3 0 32 VBottom 0
SYMATTR InstName D4
SYMATTR Value MBR735
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL cap 1072 -48 R0
WINDOW 3 44 31 Left 0
WINDOW 39 24 56 Left 0
SYMATTR Value 2200µ
SYMATTR SpiceLine Rser=0.01
SYMATTR InstName C7
SYMBOL voltage -512 192 R0
WINDOW 123 0 0 Left 0
WINDOW 39 24 132 Left 0
SYMATTR SpiceLine Rser=0.1
SYMATTR InstName V1
SYMATTR Value 180
SYMBOL res 1232 -64 R0
SYMATTR InstName R9
SYMATTR Value 2
SYMBOL ind -208 -160 R270
WINDOW 0 32 56 VTop 0
WINDOW 3 5 56 VBottom 0
SYMATTR InstName L4
SYMATTR Value 1µ
SYMBOL cap 368 208 R270
WINDOW 0 32 32 VTop 0
WINDOW 3 0 32 VBottom 0
SYMATTR InstName C6
SYMATTR Value 2.2n
SYMBOL res 448 208 R270
WINDOW 0 32 56 VTop 0
WINDOW 3 0 56 VBottom 0
SYMATTR InstName R10
SYMATTR Value 1k
SYMBOL EXTRA\\IRF\\NMOS\\irf840 704 320 R0
SYMATTR InstName U2
SYMBOL EXTRA\\UC\\UC384x\\UC3842B 128 384 R0
SYMATTR InstName U1
TEXT -530 -296 Left 0 !.tran 0 16m 0 1u startup
TEXT -528 -368 Left 0 !.include uc384x.lib
TEXT 768 -168 Left 0 !k l1 l2 l3 0.995
TEXT -528 -408 Left 0 !.ic V(vcc)=15.8
TEXT 240 -624 Left 0 ;Measuring power dissipation of a component\n----------------------------------------------------------------------\nPress the Alt-key and move the cursor over the mosfet. \nDo you see the cursor changing to a thermometer?\nNow press additionally the left mouse key. \nResult: The power disspiation versus time will be plotted in the plot window.\n \nSelect a certain time frame(an integer number of cycles) where the regulator is in steady state . \nClick with the left mouse button in the plot window on the label(formula) you just added.\nThis selects this power versus time function. \nPress the Ctrl-key and then click with the left mouse button on that label. \nA small box will come up with the average power dissipation within the \ndisplayed time frame. Forget the value RMS power. It is meaningless with \na power trace(fromula).
TEXT -528 -608 Left 0 ;A 12V/6A Step Down Converter
TEXT -528 -440 Left 0 ;Use .ic V(vcc)=15.8 to speedup UC3842 startup.
TEXT -528 -328 Left 0 ;Use "startup" option in .tran to overcome a convergence error.
TEXT 400 96 Left 0 ;optional\nsnubber
TEXT -528 -576 Left 0 ;Transformer coupling K is set to 1.0 for fastest simulation.\nThe simulation time rises by a factor of ten if a more real \nK=0.995 or less is used. The optional snubber is just guess\nwork. I don't know whether it's useful or not here.
TEXT -536 -264 Left 0 !.options reltol=0.01
TEXT -536 -240 Left 0 !.options trtol=7
TEXT -368 -240 Left 0 ;Use trtol=7 for fastest simulation, defualt is 1
RECTANGLE Normal 912 96 560 -128
RECTANGLE Normal 576 240 352 144
