Version 4
SHEET 1 2144 708
WIRE 320 -16 320 -48
WIRE 992 32 832 32
WIRE 832 64 832 32
WIRE 512 80 480 80
WIRE 784 80 512 80
WIRE 0 96 -48 96
WIRE 320 96 320 64
WIRE 368 96 320 96
WIRE 416 96 368 96
WIRE 512 112 480 112
WIRE 592 112 512 112
WIRE 0 128 0 96
WIRE 320 128 320 96
WIRE 784 192 784 128
WIRE 832 192 832 144
WIRE 0 224 0 208
WIRE 320 224 320 192
WIRE 688 432 672 432
WIRE 720 432 688 432
WIRE 864 432 800 432
WIRE 864 464 864 432
WIRE 32 496 32 464
WIRE 864 560 864 528
WIRE 304 576 304 544
WIRE 32 608 32 576
WIRE 304 688 304 656
FLAG -48 96 vc
IOPIN -48 96 In
FLAG 320 224 0
FLAG 320 -48 0
FLAG 512 112 _sr
FLAG 368 96 sc
FLAG 784 192 0
FLAG 832 192 0
FLAG 992 32 out
IOPIN 992 32 Out
FLAG 512 80 sr
FLAG 864 560 0
FLAG 688 432 out
FLAG 864 432 test
FLAG 32 464 0
FLAG 304 544 0
FLAG 0 224 0
FLAG 32 608 0
FLAG 304 688 0
SYMBOL bv 0 112 R0
WINDOW 3 -78 153 Left 2
SYMATTR Value V=time*100
SYMATTR InstName B1
SYMBOL Digital\\schmitt 416 32 R0
WINDOW 39 -8 124 Left 2
WINDOW 40 -8 152 Left 2
SYMATTR SpiceLine Vt=0.5 vh=0.5
SYMATTR SpiceLine2 tripdt=5n
SYMATTR InstName A1
SYMBOL bi 320 -16 R0
WINDOW 3 -156 -79 Left 2
SYMATTR Value I=IF(V(_sr)>0.5,table(V(vc),0,0.2m,5,4m,10,4m), -table(V(vc),0,4m,5,4m,10,0.2m))
SYMATTR InstName B2
SYMBOL cap 304 128 R0
SYMATTR InstName C1
SYMATTR Value 10n
SYMBOL e 832 48 R0
SYMATTR InstName E1
SYMATTR Value 10
SYMBOL res 704 448 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R1
SYMATTR Value 1k
SYMBOL cap 848 464 R0
SYMATTR InstName C2
SYMATTR Value 0.22µ
SYMBOL bi 32 496 R0
WINDOW 3 -156 -79 Left 2
SYMATTR Value I=table(V(vc),0,0.2m,5,4m,10,4m)
SYMATTR InstName B3
SYMBOL bi 304 576 R0
WINDOW 3 -156 -79 Left 2
SYMATTR Value I=-table(V(vc),0,4m,5,4m,10,0.2m)
SYMATTR InstName B4
TEXT -120 -120 Left 2 !.tran 100m
TEXT 368 224 Left 2 !.ic V(sc)=0
TEXT 304 312 Left 1 ;Toff = 2.5uS  Ton = 2.5u+5us*V(vc)
TEXT -120 48 Left 2 ;Sweep from 0 to 10V
TEXT -128 -208 Left 4 ;Controlled On-Time Generator
TEXT 304 328 Left 1 ;I=IF(V(_sr)>0.5, 0.2m+3.8m*V(vc)/5, -4m)
RECTANGLE Normal 944 272 160 -128