Version 4
SHEET 1 880 680
WIRE -224 32 -368 32
WIRE -80 32 -144 32
WIRE 16 32 -80 32
WIRE 80 32 16 32
WIRE -368 80 -368 32
WIRE 80 80 80 32
WIRE -80 96 -80 32
WIRE -368 240 -368 160
WIRE -80 240 -80 160
WIRE -80 240 -368 240
WIRE 80 240 80 160
WIRE 80 240 -80 240
WIRE -368 256 -368 240
FLAG -368 256 0
FLAG 16 32 out
FLAG -368 32 in
SYMBOL cap -96 96 R0
WINDOW 39 24 84 Left 2
SYMATTR SpiceLine Rser=1m
SYMATTR InstName C1
SYMATTR Value 100µ
SYMBOL ind -240 48 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 5 56 VBottom 2
WINDOW 39 -51 61 VTop 2
SYMATTR InstName L1
SYMATTR Value 100µ
SYMATTR SpiceLine Rser=1m
SYMBOL voltage -368 64 R0
WINDOW 3 33 204 Left 2
WINDOW 123 0 0 Left 2
WINDOW 39 16 108 Left 2
SYMATTR InstName V1
SYMATTR Value PULSE(0 15 0 10n 10n 3.32u 10u)
SYMATTR SpiceLine Rser=1m
SYMBOL Misc\\EuropeanResistor 64 64 R0
SYMATTR InstName R1
SYMATTR Value 500
TEXT -392 344 Left 2 !.tran 200m 
TEXT -336 -80 Left 4 ;Vout = Vin*Ton/Tper
TEXT -392 384 Left 2 !.options plotwinsize=0