Version 4
SHEET 1 1236 740
WIRE -512 64 -592 64
WIRE -432 64 -512 64
WIRE 96 64 -432 64
WIRE -512 96 -512 64
WIRE 96 112 96 64
WIRE -592 144 -592 64
WIRE -432 160 -432 144
WIRE -64 160 -432 160
WIRE 560 160 256 160
WIRE -592 240 -592 224
WIRE -512 240 -512 160
WIRE -432 240 -432 160
WIRE -64 240 -320 240
WIRE 288 240 256 240
WIRE 384 240 288 240
WIRE 448 240 384 240
WIRE 560 240 560 160
WIRE 560 240 528 240
WIRE 656 240 560 240
WIRE 752 240 656 240
WIRE 848 240 752 240
WIRE 288 256 288 240
WIRE 384 256 384 240
WIRE 752 256 752 240
WIRE 848 256 848 240
WIRE -320 272 -320 240
WIRE 560 272 560 240
WIRE -64 320 -208 320
WIRE 288 320 256 320
WIRE 384 336 384 320
WIRE 656 336 656 240
WIRE 752 352 752 320
WIRE 848 352 848 336
WIRE -320 400 -320 352
WIRE -208 400 -208 320
WIRE -64 400 -80 400
WIRE 560 400 560 352
WIRE 560 400 256 400
WIRE 560 416 560 400
WIRE 96 464 96 448
WIRE 560 512 560 496
WIRE -432 528 -432 304
WIRE -320 528 -320 464
WIRE -208 528 -208 480
WIRE -80 544 -80 400
WIRE 656 544 656 416
WIRE 656 544 -80 544
FLAG 384 336 0
FLAG 752 352 0
FLAG 560 512 0
FLAG -320 528 0
FLAG -592 240 0
FLAG 96 464 0
FLAG 848 352 0
FLAG -208 528 0
FLAG -432 528 0
FLAG 848 240 OUT
FLAG -592 64 IN
FLAG -512 240 0
SYMBOL ind 432 256 R270
WINDOW 0 32 56 VTop 0
WINDOW 3 5 56 VBottom 0
SYMATTR InstName L1
SYMATTR Value 5.9µ
SYMATTR SpiceLine Rpar=2K
SYMBOL schottky 368 320 M180
WINDOW 0 28 62 Left 0
WINDOW 3 24 0 Left 0
SYMATTR InstName D1
SYMATTR Value MBRS340
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL cap 736 256 R0
SYMATTR InstName Cout
SYMATTR Value 15µ
SYMBOL voltage -592 128 R0
WINDOW 3 25 92 Left 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR Value 15
SYMATTR InstName V1
SYMBOL res 544 256 R0
SYMATTR InstName R1
SYMATTR Value 532K
SYMBOL res 544 400 R0
SYMATTR InstName R2
SYMATTR Value 100K
SYMBOL cap 272 256 R0
WINDOW 3 30 49 Left 0
SYMATTR Value .22µ
SYMATTR InstName C2
SYMBOL cap -336 400 R0
SYMATTR InstName Cc
SYMATTR Value 680p
SYMBOL res -336 256 R0
SYMATTR InstName Rc
SYMATTR Value 15K
SYMBOL res -224 384 R0
SYMATTR InstName Rt
SYMATTR Value 20.2k
SYMBOL res 640 320 R0
SYMATTR InstName R5
SYMATTR Value 100K
SYMBOL res -448 48 R0
SYMATTR InstName Rsoft
SYMATTR Value 500K
SYMBOL cap -448 240 R0
SYMATTR InstName Csoft
SYMATTR Value .01µ
SYMBOL PowerProducts\\LT3972 96 288 R0
SYMATTR InstName U1
SYMBOL current 848 256 R0
SYMATTR InstName I1
SYMATTR Value 1
SYMBOL cap -528 96 R0
SYMATTR InstName Cin
SYMATTR Value 15µ
TEXT 264 496 Left 0 !.tran 1.5m startup
TEXT -576 16 Left 0 ;.step param SPSVin 5 35 10