Version 4
SHEET 1 1004 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 448 336 400 336
WIRE 544 336 528 336
WIRE 592 336 592 144
WIRE 592 336 544 336
WIRE 704 336 592 336
WIRE 784 336 704 336
WIRE 400 352 400 336
WIRE 544 352 544 336
WIRE 592 352 592 336
WIRE 784 352 784 336
WIRE 704 368 704 336
WIRE 80 432 64 432
WIRE 544 432 544 416
WIRE 544 432 368 432
WIRE 592 432 544 432
WIRE 400 448 400 416
WIRE 592 448 592 432
WIRE 704 448 704 432
WIRE 784 448 784 432
WIRE 592 544 592 528
FLAG 64 432 0
FLAG -32 336 0
FLAG 784 448 0
FLAG 704 448 0
FLAG 592 544 0
FLAG -160 48 0
FLAG 400 448 0
FLAG -48 160 0
FLAG -32 240 0
FLAG -160 -64 IN
FLAG 784 336 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 res 576 432 R0
SYMATTR InstName R2
SYMATTR Value 309K
SYMBOL ind 432 352 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName L1
SYMATTR Value 4.7µ
SYMBOL res 576 336 R0
SYMATTR InstName R3
SYMATTR Value 1Meg
SYMBOL cap 688 368 R0
SYMATTR InstName C1
SYMATTR Value 22µ
SYMBOL res 768 336 R0
SYMATTR InstName Rload
SYMATTR Value 3.84
SYMBOL voltage -160 -64 R0
SYMATTR InstName V1
SYMATTR Value 24
SYMBOL schottky 384 416 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 cap 528 352 R0
SYMATTR InstName C4
SYMATTR Value 10p
SYMBOL PowerProducts\\LT3971A 224 240 R0
SYMATTR InstName U1
TEXT 752 536 Left 2 !.tran 1.5m startup