Version 4
SHEET 1 1380 692
WIRE -112 -112 -208 -112
WIRE 0 -112 -112 -112
WIRE 192 -112 0 -112
WIRE 224 -112 192 -112
WIRE 320 -112 224 -112
WIRE 560 -112 320 -112
WIRE 688 -112 608 -112
WIRE 800 -112 752 -112
WIRE 896 -112 800 -112
WIRE 224 -96 224 -112
WIRE 320 -96 320 -112
WIRE 560 -96 560 -112
WIRE 608 -96 608 -112
WIRE 800 -96 800 -112
WIRE 896 -96 896 -112
WIRE -208 -80 -208 -112
WIRE -112 -80 -112 -112
WIRE 0 -80 0 -112
WIRE 224 0 224 -32
WIRE 320 0 320 -16
WIRE 320 0 224 0
WIRE 400 0 320 0
WIRE 560 0 560 -16
WIRE 560 0 464 0
WIRE 608 0 608 -16
WIRE 800 0 800 -32
WIRE 896 0 896 -16
WIRE -208 16 -208 0
WIRE -112 16 -112 -16
WIRE 192 32 192 -112
WIRE -144 96 -160 96
WIRE 0 96 0 0
WIRE 0 96 -64 96
WIRE 32 96 0 96
WIRE 384 96 352 96
WIRE 560 96 560 0
WIRE 560 96 464 96
WIRE -64 176 -160 176
WIRE 32 176 16 176
WIRE 560 176 560 96
WIRE 560 176 352 176
WIRE -96 256 -160 256
WIRE 32 256 -16 256
WIRE 368 256 352 256
WIRE 464 256 448 256
WIRE -144 336 -160 336
WIRE -48 336 -64 336
WIRE 32 336 16 336
WIRE 368 336 352 336
WIRE 464 336 432 336
WIRE 128 416 128 400
WIRE 256 416 256 400
WIRE 128 496 128 480
FLAG 256 416 0
FLAG 128 496 0
FLAG -160 336 0
FLAG -160 176 0
FLAG -160 256 0
FLAG -208 16 0
FLAG 464 336 0
FLAG 464 256 0
FLAG 800 0 0
FLAG 608 0 0
FLAG 896 0 0
FLAG -208 -112 IN
FLAG 896 -112 OUT
FLAG -160 96 0
FLAG -112 16 0
SYMBOL res 0 240 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 10K
SYMBOL res 32 160 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 28.7K
SYMBOL voltage -208 -96 R0
SYMATTR InstName V1
SYMATTR Value 18
SYMBOL cap 16 320 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C1
SYMATTR Value .001µ
SYMBOL cap 432 320 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C2
SYMATTR Value 4.7µ
SYMBOL res 480 80 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 80.6K
SYMBOL res 464 240 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R4
SYMATTR Value 6.04K
SYMBOL ind2 544 -112 R0
WINDOW 0 0 35 Right 2
WINDOW 3 0 72 Right 2
SYMATTR InstName L1
SYMATTR Value 100µ
SYMATTR Type ind
SYMATTR SpiceLine Rser=0.22 Rpar=5K
SYMBOL ind2 624 0 R180
WINDOW 0 -3 72 Right 2
WINDOW 3 1 44 Right 2
SYMATTR InstName L2
SYMATTR Value 1000µ
SYMATTR Type ind
SYMATTR SpiceLine Rser=31 Rpar=5K
SYMBOL cap 784 -96 R0
SYMATTR InstName C3
SYMATTR Value 1µ
SYMBOL schottky 688 -96 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 res -48 320 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R5
SYMATTR Value 59K
SYMBOL cap 112 480 M180
WINDOW 0 24 64 Left 2
WINDOW 3 24 8 Left 2
SYMATTR InstName C4
SYMATTR Value .01µ
SYMBOL res -16 -96 R0
SYMATTR InstName R6
SYMATTR Value 357K
SYMBOL res -48 80 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R7
SYMATTR Value 51.1K
SYMBOL res 304 -112 R0
SYMATTR InstName R8
SYMATTR Value 1K
SYMBOL cap 208 -96 R0
SYMATTR InstName C5
SYMATTR Value .22µ
SYMBOL diode 464 16 M270
WINDOW 0 32 32 VTop 2
WINDOW 3 -3 0 VBottom 2
SYMATTR InstName D2
SYMATTR Value ES1D
SYMBOL res 880 -112 R0
SYMATTR InstName Rload
SYMATTR Value 12.1
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL PowerProducts\\LT3574 192 208 R0
SYMATTR InstName U1
SYMBOL cap -128 -80 R0
SYMATTR InstName C6
SYMATTR Value 10µ
TEXT 576 -120 Bottom 2 !K1 L1 L2 1
TEXT 328 464 Left 2 !.tran 100m startup
TEXT -360 512 Left 2 ;Notes:\n  If the simulation model is not found please update with the "Sync Release" command from the "Tools" menu.\n  It remains the customer's responsibility to verify proper and reliable operation in the actual application.\n  Component substitution and printed circuit board layout may significantly affect circuit performance or reliability.\n  Contact your local sales representative for assistance. This circuit is distributed to customers only for use with LTC parts.\n  Copyright © 2010 Linear Technology Inc. All rights reserved.
TEXT 272 -152 Bottom 2 ;LT3574  - Isolated Flyback Converter Without an Opto-Coupler \nInput 12V to 24V, Output 5V @ 350mA