Version 4
SHEET 1 1704 992
WIRE -464 64 -640 64
WIRE -320 64 -384 64
WIRE -256 64 -320 64
WIRE -80 64 -192 64
WIRE -16 64 -80 64
WIRE 128 64 48 64
WIRE 304 64 128 64
WIRE 464 64 304 64
WIRE 304 144 304 64
WIRE -80 160 -80 64
WIRE 128 160 128 64
WIRE -320 176 -320 64
WIRE -1328 208 -1328 160
WIRE -1328 304 -1328 288
WIRE -320 320 -320 256
WIRE -80 320 -80 240
WIRE 128 320 128 224
WIRE 304 320 304 224
FLAG -1328 736 0
FLAG -1328 656 Uglr
FLAG -640 64 Uglr
IOPIN -640 64 In
FLAG -320 320 0
FLAG -272 240 0
FLAG -272 192 pwm
IOPIN -272 192 In
FLAG 128 320 0
FLAG -1328 304 0
FLAG -1328 432 pwm
IOPIN -1328 432 Out
FLAG -1328 512 0
FLAG -1328 160 Uramp
FLAG -80 320 0
FLAG 304 320 0
FLAG 464 64 Ua
SYMBOL bv -1328 640 R0
SYMATTR InstName B1
SYMATTR Value V=20
SYMBOL ind -480 80 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName L1
SYMATTR Value 100µ
SYMATTR SpiceLine Rser=1e-3
SYMBOL sw -320 272 R180
SYMATTR InstName MySwitch
SYMATTR Value MySwitch
SYMBOL voltage -1328 192 R0
WINDOW 3 38 97 Left 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR Value PULSE(0 3 0 {0.5/freq} {0.5/freq} 1p {1/freq})
SYMATTR InstName V1
SYMBOL bv -1328 416 R0
SYMATTR InstName B3
SYMATTR Value V=sgn(Vpwm-V(Uramp)) tripdv=0
SYMBOL ind -64 256 R180
WINDOW 0 36 80 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName L2
SYMATTR Value 100µ
SYMATTR SpiceLine Rser=1e-2
SYMBOL res 288 128 R0
SYMATTR InstName R1
SYMATTR Value 5
SYMBOL schottky -16 80 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D1
SYMATTR Value MBRS1100
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL cap -192 48 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C1
SYMATTR Value 680µ
SYMATTR SpiceLine Rser=3e-3
SYMBOL cap 144 224 R180
WINDOW 0 24 56 Left 2
WINDOW 3 24 8 Left 2
SYMATTR InstName C2
SYMATTR Value 1000µ
SYMATTR SpiceLine Rser=1e-3
TEXT -1632 -56 Left 2 !.params freq=10k vout=2V Vpwm=2.0
TEXT -1632 -96 Left 2 !.tran 0 500m 0 1e-7 uic
TEXT -1632 -8 Left 2 !.model MySwitch SW(Ron=0.0000001 Roff=1000Meg Vt=0 Vh=0.0 Lser=0 Vser=0)