Version 4
SHEET 1 2208 836
WIRE 80 0 -448 0
WIRE 496 0 80 0
WIRE 528 0 496 0
WIRE 624 0 608 0
WIRE 736 0 624 0
WIRE 1120 0 832 0
WIRE 1184 0 1120 0
WIRE 1280 0 1184 0
WIRE -448 16 -448 0
WIRE 1280 16 1280 0
WIRE 1184 32 1184 0
WIRE 80 64 80 0
WIRE 816 80 816 48
WIRE 976 80 816 80
WIRE 1120 80 1120 0
WIRE 1120 80 1040 80
WIRE 816 96 816 80
WIRE -448 112 -448 96
WIRE 1184 112 1184 96
WIRE 1280 112 1280 96
WIRE 496 144 496 0
WIRE 624 144 624 0
WIRE 816 208 816 176
WIRE 816 208 720 208
WIRE 864 208 816 208
WIRE 960 208 944 208
WIRE 80 240 80 144
WIRE 80 240 -32 240
WIRE 416 240 80 240
WIRE -32 256 -32 240
WIRE 80 256 80 240
WIRE 1120 288 1120 80
WIRE 1120 288 720 288
WIRE 416 320 176 320
WIRE -32 352 -32 320
WIRE 80 352 80 336
WIRE 176 352 176 320
WIRE 176 352 80 352
WIRE 944 368 720 368
WIRE 1008 368 944 368
WIRE 1120 368 1120 288
WIRE 1120 368 1088 368
WIRE 80 384 80 352
WIRE 416 400 240 400
WIRE 944 400 944 368
WIRE 1120 400 1120 368
WIRE 880 448 720 448
WIRE 80 496 80 464
WIRE 336 496 320 496
WIRE 416 496 400 496
WIRE 944 496 944 480
WIRE 112 528 48 528
WIRE 240 528 240 400
WIRE 240 528 192 528
WIRE 736 528 720 528
WIRE 880 544 880 448
WIRE 1120 544 1120 480
WIRE 1120 544 880 544
WIRE 48 560 48 528
WIRE 240 592 240 528
WIRE 560 592 560 576
WIRE 48 672 48 640
WIRE 240 672 240 656
FLAG 1024 208 0
FLAG 320 496 0
FLAG 944 496 0
FLAG -448 112 0
FLAG 1280 112 0
FLAG -32 352 0
FLAG 1184 112 0
FLAG 560 592 0
FLAG 80 496 0
FLAG 240 672 0
FLAG 48 672 0
FLAG -448 0 IN
FLAG 1280 0 OUT
FLAG 736 528 0
SYMBOL res 64 48 R0
SYMATTR InstName R1
SYMATTR Value 64.9K
SYMBOL res 64 240 R0
SYMATTR InstName R2
SYMATTR Value 4.02K
SYMBOL cap 400 480 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C1
SYMATTR Value 33n
SYMBOL cap 1024 192 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C2
SYMATTR Value 20n
SYMBOL res 800 80 R0
SYMATTR InstName R3
SYMATTR Value 10
SYMBOL res 960 192 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R4
SYMATTR Value 100
SYMBOL res 512 16 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R5
SYMATTR Value 20m
SYMBOL nmos 736 48 R270
WINDOW 0 70 28 VRight 2
WINDOW 3 27 95 VRight 2
SYMATTR InstName M1
SYMATTR Value SUD40N10-25
SYMBOL res 1104 352 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R6
SYMATTR Value 36.5K
SYMBOL res 928 384 R0
SYMATTR InstName R7
SYMATTR Value 4.02K
SYMBOL cap 1168 32 R0
SYMATTR InstName C3
SYMATTR Value 225µ
SYMATTR SpiceLine Rser=10m
SYMBOL voltage -448 0 R0
WINDOW 3 26 96 Left 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR Value PWL(0 0 20u 48 0.1 48 0.2 90 0.3 48)
SYMATTR InstName V1
SYMBOL res 1264 0 R0
SYMATTR InstName R9
SYMATTR Value 24
SYMBOL cap -48 256 R0
SYMATTR InstName C4
SYMATTR Value .1µ
SYMBOL LT4256-3 560 336 R0
SYMATTR InstName U1
SYMBOL zener 1040 64 R90
WINDOW 0 -4 32 VBottom 2
WINDOW 3 36 32 VTop 2
SYMATTR InstName D1
SYMATTR Value BZX84C12L
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL res 1104 384 R0
SYMATTR InstName R8
SYMATTR Value 51K
SYMBOL res 64 368 R0
SYMATTR InstName R10
SYMATTR Value 4.02K
SYMBOL res 208 544 M270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R11
SYMATTR Value 10K
SYMBOL cap 224 592 R0
SYMATTR InstName C5
SYMATTR Value .01µ
SYMBOL voltage 48 544 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value 3.3
TEXT 1008 696 Left 2 !.tran 0.4 startup
TEXT 672 608 Left 2 !.model Ideal D( Ron=0.001 Roff=10G Vfwd=0 Epsilon=0.01 )\n.model OverCurrent SW(Ron=1 Roff=10G Vt=0.5 Vh=-0.1)