Version 4
SHEET 1 916 680
WIRE 64 16 -32 16
WIRE 416 16 64 16
WIRE 560 16 464 16
WIRE 688 16 624 16
WIRE 784 16 688 16
WIRE -32 32 -32 16
WIRE 416 32 416 16
WIRE 464 32 464 16
WIRE 688 32 688 16
WIRE 784 32 784 16
WIRE -32 128 -32 112
WIRE 464 128 464 112
WIRE 688 128 688 96
WIRE 784 128 784 112
WIRE 64 144 64 16
WIRE 96 144 64 144
WIRE 416 144 416 112
WIRE 416 144 320 144
WIRE 416 176 416 144
WIRE 64 272 64 144
WIRE 96 272 64 272
WIRE 416 272 416 256
WIRE 416 272 320 272
WIRE 208 336 208 320
FLAG 208 336 0
FLAG -32 128 0
FLAG -32 16 IN
FLAG 464 128 0
FLAG 688 128 0
FLAG 784 128 0
FLAG 784 16 OUT
SYMBOL voltage -32 16 R0
SYMATTR InstName V1
SYMATTR Value 40
SYMBOL ind2 400 16 R0
WINDOW 0 1 37 Right 2
WINDOW 3 0 77 Right 2
SYMATTR InstName L1
SYMATTR Value 150µ
SYMATTR Type ind
SYMATTR SpiceLine Rser=500m Cpar=1p
SYMBOL ind2 480 128 R180
WINDOW 0 -4 74 Right 2
WINDOW 3 0 35 Right 2
SYMATTR InstName L2
SYMATTR Value 4.2µ
SYMATTR Type ind
SYMATTR SpiceLine Rser=20m Cpar=.2p
SYMBOL res 400 160 R0
SYMATTR InstName R3
SYMATTR Value 316K
SYMBOL schottky 560 32 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D1
SYMATTR Value MBRS340
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL cap 672 32 R0
SYMATTR InstName C1
SYMATTR Value 47µ
SYMBOL res 768 16 R0
SYMATTR InstName Rload
SYMATTR Value 20
SYMBOL PowerProducts\\LT8303 208 208 R0
SYMATTR InstName U1
TEXT 440 16 Bottom 2 !K1 L1 L2 1
TEXT 560 312 Left 2 !.tran 3m startup