Version 4
SHEET 1 1288 740
WIRE -448 32 -480 32
WIRE -80 32 -368 32
WIRE 112 32 -80 32
WIRE 256 32 192 32
WIRE 288 32 256 32
WIRE 400 32 352 32
WIRE 448 32 400 32
WIRE 576 32 528 32
WIRE 624 32 576 32
WIRE 752 32 688 32
WIRE 880 32 752 32
WIRE 1008 32 880 32
WIRE 1024 32 1008 32
WIRE -80 80 -80 32
WIRE 256 96 256 32
WIRE -240 144 -416 144
WIRE 752 144 752 32
WIRE 176 176 80 176
WIRE 208 176 176 176
WIRE -416 208 -416 144
WIRE -400 208 -416 208
WIRE -240 208 -320 208
WIRE 176 208 176 176
WIRE 400 208 400 32
WIRE 576 208 576 32
WIRE 880 208 880 32
WIRE 1008 224 1008 32
WIRE 752 256 752 224
WIRE 752 256 672 256
WIRE -336 272 -352 272
WIRE -240 272 -256 272
WIRE 256 304 256 192
WIRE 256 304 80 304
WIRE 752 304 752 256
WIRE 256 320 256 304
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 176 432 176 272
WIRE 256 432 256 400
WIRE 400 432 400 272
WIRE 576 432 576 272
WIRE 752 432 752 384
WIRE 880 432 880 272
WIRE 1008 432 1008 304
WIRE -416 496 -416 208
WIRE 672 496 672 256
WIRE 672 496 -416 496
FLAG 1008 432 0
FLAG -352 432 0
FLAG -80 432 0
FLAG 1024 32 out
IOPIN 1024 32 Out
FLAG -480 32 0
FLAG 176 432 0
FLAG 256 432 0
FLAG 752 432 0
FLAG 400 432 0
FLAG 880 432 0
FLAG 576 432 0
FLAG 576 32 P3
IOPIN 576 32 BiDir
FLAG 400 32 P2
IOPIN 400 32 BiDir
FLAG 256 32 P1
IOPIN 256 32 BiDir
SYMBOL nmos 208 96 R0
SYMATTR InstName M1
SYMATTR Value IRF740
SYMBOL ind2 96 48 R270
WINDOW 0 -13 111 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName L1
SYMATTR Value 30µ
SYMATTR SpiceLine Rser=0.01
SYMATTR Type ind
SYMBOL schottky 288 48 R270
WINDOW 0 -13 93 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D1
SYMATTR Value UPSC600
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL res 736 128 R0
SYMATTR InstName R4
SYMATTR Value 470k
SYMBOL res 736 288 R0
SYMATTR InstName R5
SYMATTR Value 4k7
SYMBOL res 992 208 R0
SYMATTR InstName Rload
SYMATTR Value 5k
SYMBOL PowerProducts\\LT1243 -80 240 R0
SYMATTR InstName U1
SYMBOL res 240 304 R0
SYMATTR InstName R1
SYMATTR Value 0.3
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 3n3
SYMBOL res -304 192 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 150k
SYMBOL schottky 192 272 R180
WINDOW 0 24 72 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D4
SYMATTR Value 1N5819
SYMATTR Description Diode
SYMATTR Type diode
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 polcap 384 208 R0
WINDOW 3 24 56 Left 2
SYMATTR InstName C2
SYMATTR Value 47µ
SYMATTR Description Capacitor
SYMATTR Type cap
SYMATTR SpiceLine V=100 Irms=210m Rser=0.37 Lser=0 mfg="Nichicon" pn="UPR2A470MPH" type="Al electrolytic"
SYMBOL ind2 432 48 R270
WINDOW 0 -13 110 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName L2
SYMATTR Value 100µ
SYMATTR SpiceLine Rser=0.5
SYMATTR Type ind
SYMBOL schottky 624 48 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D2
SYMATTR Value UPSC600
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL polcap 864 208 R0
WINDOW 3 24 56 Left 2
SYMATTR InstName C3
SYMATTR Value 47µ
SYMATTR Description Capacitor
SYMATTR Type cap
SYMATTR SpiceLine V=100 Irms=210m Rser=0.37 Lser=0 mfg="Nichicon" pn="UPR2A470MPH" type="Al electrolytic"
SYMBOL schottky 592 272 R180
WINDOW 0 24 64 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D3
SYMATTR Value UPSC600
SYMATTR Description Diode
SYMATTR Type diode
TEXT -232 480 Left 2 !.tran 0 200m 0 100µ startup uic
TEXT -120 288 Left 2 ;UC3843
TEXT 264 -24 Left 2 !K1 L1 L2 0.8
LINE Normal 528 0 112 0 2