Version 4
SHEET 1 984 680
WIRE -48 -64 -160 -64
WIRE 400 -64 -48 -64
WIRE -160 -48 -160 -64
WIRE -48 -48 -48 -64
WIRE -160 48 -160 32
WIRE -48 48 -48 32
WIRE 80 48 -48 48
WIRE 400 48 400 -64
WIRE 400 48 368 48
WIRE -48 64 -48 48
WIRE 80 144 64 144
WIRE 592 144 368 144
WIRE -48 160 -48 144
WIRE 0 240 -32 240
WIRE 80 240 64 240
WIRE 400 240 368 240
WIRE 400 256 400 240
WIRE -16 336 -32 336
WIRE 80 336 64 336
WIRE 400 336 400 320
WIRE 400 336 368 336
WIRE 480 336 400 336
WIRE 592 336 592 144
WIRE 592 336 560 336
WIRE 656 336 592 336
WIRE 736 336 656 336
WIRE 736 352 736 336
WIRE 656 368 656 336
WIRE 80 432 64 432
WIRE 592 432 592 336
WIRE 592 432 368 432
WIRE 656 448 656 432
WIRE 736 448 736 432
FLAG 64 432 0
FLAG -32 336 0
FLAG 736 448 0
FLAG 656 448 0
FLAG -160 48 0
FLAG 400 400 0
FLAG -48 160 0
FLAG -32 240 0
FLAG -160 -64 IN
FLAG 736 336 OUT
SYMBOL res 80 320 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 49.9K
SYMBOL ind 464 352 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName L1
SYMATTR Value 4.7µ
SYMBOL cap 640 368 R0
SYMATTR InstName C1
SYMATTR Value 22µ
SYMBOL res 720 336 R0
SYMATTR InstName Rout
SYMATTR Value 4.16
SYMBOL voltage -160 -64 R0
SYMATTR InstName V1
SYMATTR Value 24
SYMBOL schottky 384 400 M180
WINDOW 0 26 68 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D1
SYMATTR Value DFLS220L
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL cap 384 256 R0
WINDOW 3 24 54 Left 2
SYMATTR Value .47µ
SYMATTR InstName C2
SYMBOL res -64 48 R0
SYMATTR InstName R5
SYMATTR Value 1Meg
SYMBOL res -64 -64 R0
SYMATTR InstName R6
SYMATTR Value 5Meg
SYMBOL cap 64 224 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C3
SYMATTR Value .001µ
SYMBOL PowerProducts\\LT3971-5 224 240 R0
SYMATTR InstName U1
TEXT 512 72 Left 2 !.tran 1.5m startup