Version 4
SHEET 1 1316 680
WIRE 96 112 96 96
WIRE 592 112 592 96
WIRE 864 112 864 96
WIRE 96 208 96 192
WIRE 592 208 592 192
WIRE 864 208 864 192
FLAG 96 96 tri
FLAG 96 208 0
FLAG 864 208 0
FLAG 592 96 vr
FLAG 592 208 0
FLAG 864 96 PWM
SYMBOL voltage 96 96 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value PULSE(1 0 0 {TP/2} {TP/2} 0 {TP})
SYMBOL bv 864 96 R0
SYMATTR InstName B1
SYMATTR Value V=5*IF(V(tri)>V(vr),0,1) tripdt=10n
SYMBOL voltage 592 96 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value PWL(0 0.1 1 0.9)
TEXT 88 -72 Left 2 !.tran 1
TEXT 256 -72 Left 2 !.param TP=10m
TEXT 88 -24 Left 2 !.options plotwinsize=0