Version 4 SHEET 1 1288 740 WIRE -448 32 -480 32 WIRE -80 32 -368 32 WIRE 208 32 -80 32 WIRE 352 32 288 32 WIRE 384 32 352 32 WIRE 496 32 448 32 WIRE 592 32 496 32 WIRE 768 32 592 32 WIRE 784 32 768 32 WIRE -80 80 -80 32 WIRE 352 96 352 32 WIRE -240 144 -416 144 WIRE 592 144 592 32 WIRE 160 176 80 176 WIRE 304 176 240 176 WIRE -416 208 -416 144 WIRE -400 208 -416 208 WIRE -240 208 -320 208 WIRE 768 224 768 32 WIRE 496 240 496 32 WIRE 592 256 592 224 WIRE 672 256 592 256 WIRE -336 272 -352 272 WIRE -240 272 -256 272 WIRE 352 304 352 192 WIRE 352 304 80 304 WIRE 592 304 592 256 WIRE 352 320 352 304 WIRE -352 336 -352 272 WIRE -240 336 -352 336 WIRE -352 352 -352 336 WIRE -352 432 -352 416 WIRE -80 432 -80 400 WIRE 352 432 352 400 WIRE 496 432 496 304 WIRE 592 432 592 384 WIRE 768 432 768 304 WIRE -416 496 -416 208 WIRE 672 496 672 256 WIRE 672 496 -416 496 FLAG 768 432 0 FLAG -352 432 0 FLAG -80 432 0 FLAG 784 32 out IOPIN 784 32 Out FLAG -480 32 0 FLAG 352 432 0 FLAG 592 432 0 FLAG 496 432 0 SYMBOL nmos 304 96 R0 SYMATTR InstName M1 SYMATTR Value IRF740 SYMBOL ind 192 48 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 5 56 VBottom 2 SYMATTR InstName L1 SYMATTR Value 330µ SYMATTR SpiceLine Rser=0.1 SYMBOL schottky 384 48 R270 WINDOW 0 32 32 VTop 2 WINDOW 3 0 32 VBottom 2 SYMATTR InstName D1 SYMATTR Value UPSC600 SYMATTR Description Diode SYMATTR Type diode SYMBOL res 576 128 R0 SYMATTR InstName R4 SYMATTR Value 510k SYMBOL res 576 288 R0 SYMATTR InstName R5 SYMATTR Value 6k8 SYMBOL cap 480 240 R0 SYMATTR InstName C5 SYMATTR Value 470n SYMBOL res 752 208 R0 SYMATTR InstName Rload SYMATTR Value 9k SYMBOL PowerProducts\\LT1243 -80 240 R0 SYMATTR InstName U1 SYMBOL res 336 304 R0 SYMATTR InstName R1 SYMATTR Value 1 SYMBOL res -240 256 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R2 SYMATTR Value 5k4 SYMBOL cap -368 352 R0 SYMATTR InstName C1 SYMATTR Value 6n8 SYMBOL res -304 192 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R3 SYMATTR Value 150k SYMBOL voltage -352 32 M270 WINDOW 0 -19 115 VLeft 2 WINDOW 3 -19 25 VLeft 2 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V1 SYMATTR Value 12 SYMBOL res 256 160 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R6 SYMATTR Value 3.8 TEXT -232 480 Left 2 !.tran 0 20m 0 10µ steady startup uic TEXT -120 288 Left 2 ;UC3843