Version 4 SHEET 1 1004 680 WIRE 96 80 -48 80 WIRE 192 80 96 80 WIRE 352 80 272 80 WIRE 416 80 352 80 WIRE 544 80 480 80 WIRE 688 80 544 80 WIRE -48 128 -48 80 WIRE 96 128 96 80 WIRE 352 128 352 80 WIRE 544 128 544 80 WIRE 688 128 688 80 WIRE 304 144 208 144 WIRE 208 160 208 144 WIRE 304 240 304 192 WIRE 304 240 208 240 WIRE -48 256 -48 208 WIRE 96 256 96 192 WIRE 208 256 208 240 WIRE 352 256 352 208 WIRE 544 256 544 192 WIRE 688 256 688 208 FLAG -48 256 0 FLAG 96 256 0 FLAG 544 256 0 FLAG 688 256 0 FLAG 352 256 0 FLAG 208 256 0 FLAG 688 80 OUT SYMBOL voltage -48 112 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V1 SYMATTR Value 12 SYMBOL cap 80 128 R0 SYMATTR InstName C1 SYMATTR Value 10µ SYMBOL sw 352 112 R0 WINDOW 0 18 -8 VRight 2 WINDOW 3 50 24 VRight 2 SYMATTR InstName S1 SYMATTR Value FETsw SYMBOL schottky 416 64 M90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName D1 SYMATTR Value 1N5819 SYMATTR Description Diode SYMATTR Type diode SYMBOL cap 528 128 R0 SYMATTR InstName C2 SYMATTR Value 10µ SYMBOL res 672 112 R0 SYMATTR InstName R1 SYMATTR Value 24 SYMBOL voltage 208 256 R180 WINDOW 3 -594 -34 Left 2 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR Value PWL repeat forever (0s 0V 5us 1V 10us 0V) endrepeat SYMATTR InstName V2 SYMBOL ind 176 96 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 5 56 VBottom 2 SYMATTR InstName L1 SYMATTR Value 220µ TEXT 8 0 Left 2 !.model FETsw sw(Vt={1-{Duty}} Ron=1u) TEXT 504 0 Left 2 !.param Duty=.1-12V/24V TEXT -64 288 Left 2 !.tran 0 50m 0 1n startup