Version 4
SHEET 1 900 716
WIRE -112 96 -208 96
WIRE 128 96 -112 96
WIRE 176 96 128 96
WIRE 304 96 256 96
WIRE 336 96 304 96
WIRE 416 96 400 96
WIRE 512 96 416 96
WIRE 640 96 576 96
WIRE 688 96 640 96
WIRE 800 96 688 96
WIRE -208 112 -208 96
WIRE 688 112 688 96
WIRE 800 112 800 96
WIRE -112 128 -112 96
WIRE 416 144 416 96
WIRE 128 192 128 96
WIRE -208 208 -208 192
WIRE 688 208 688 176
WIRE 800 208 800 192
WIRE -112 256 -112 208
WIRE -16 256 -112 256
WIRE 304 256 304 96
WIRE 304 256 272 256
WIRE 416 272 416 224
WIRE -96 336 -128 336
WIRE -16 336 -32 336
WIRE 480 336 272 336
WIRE 640 336 640 96
WIRE 640 336 560 336
WIRE -112 416 -128 416
WIRE -16 416 -32 416
WIRE 320 416 272 416
WIRE 416 416 384 416
WIRE 128 512 128 480
FLAG 128 512 0
FLAG 688 208 0
FLAG 416 416 0
FLAG -128 416 0
FLAG -128 336 0
FLAG -208 208 0
FLAG 800 208 0
FLAG -208 96 IN
FLAG 800 96 OUT
FLAG 416 272 0
SYMBOL ind2 272 80 R90
WINDOW 0 4 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName L1
SYMATTR Value 47µ
SYMATTR SpiceLine Rser=50m
SYMATTR Type ind
SYMBOL schottky 512 112 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D1
SYMATTR Value MBRS140
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL cap 672 112 R0
SYMATTR InstName C1
SYMATTR Value 10µ
SYMATTR SpiceLine Rser=5m
SYMBOL cap 384 400 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
WINDOW 39 65 -56 VTop 2
SYMATTR InstName C2
SYMATTR Value 3300p
SYMATTR SpiceLine Rser=8.87K Cpar=47p
SYMBOL res -16 400 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 82k
SYMBOL cap -32 320 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C3
SYMATTR Value .1µ
SYMBOL voltage -208 96 R0
SYMATTR InstName V1
SYMATTR Value 12
SYMBOL res 576 320 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 25.162k
SYMBOL res 784 96 R0
SYMATTR InstName Rload
SYMATTR Value 100
SYMBOL res -128 112 R0
SYMATTR InstName R3
SYMATTR Value 100k
SYMBOL PowerProducts\\LT8570-1 128 336 R0
SYMATTR InstName U1
SYMBOL cap 336 112 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName C4
SYMATTR Value 1µ
SYMBOL ind2 400 128 R0
SYMATTR InstName L2
SYMATTR Value 47µ
SYMATTR SpiceLine Rser=50m
SYMATTR Type ind
TEXT -200 -56 Left 2 !.tran 0 12m 8m startup
TEXT -200 -16 Left 2 !K1 L1 L2 1
TEXT -160 576 Left 2 ;Rfbx = |V(out Vfbx|/83.3uA\n \nVfbx = 1.204V\nRfbx = (3.3-1.204)/83.3e-6 \nRfbx = 25162.065