Version 4 SHEET 1 5945676 13421556 WIRE 2176 -80 2016 -80 WIRE 2368 -80 2176 -80 WIRE 2592 -80 2368 -80 WIRE 2704 -80 2592 -80 WIRE 2832 -80 2704 -80 WIRE 2016 -64 2016 -80 WIRE 2592 -64 2592 -80 WIRE 2704 -64 2704 -80 WIRE 2176 -32 2176 -80 WIRE 2832 -32 2832 -80 WIRE 2880 -32 2832 -32 WIRE 3040 -32 2944 -32 WIRE 3136 -32 3104 -32 WIRE 3184 -32 3136 -32 WIRE 3312 -32 3264 -32 WIRE 3440 -32 3312 -32 WIRE 3568 -32 3440 -32 WIRE 2880 -16 2880 -32 WIRE 2944 -16 2944 -32 WIRE 3136 -16 3136 -32 WIRE 3312 -16 3312 -32 WIRE 3440 -16 3440 -32 WIRE 3568 -16 3568 -32 WIRE 2368 16 2368 -80 WIRE 2016 32 2016 16 WIRE 2592 32 2592 0 WIRE 2704 32 2704 16 WIRE 2704 32 2592 32 WIRE 2704 48 2704 32 WIRE 1904 80 1856 80 WIRE 2064 80 1968 80 WIRE 2176 80 2176 48 WIRE 2176 80 2128 80 WIRE 2880 80 2880 64 WIRE 2880 80 2832 80 WIRE 2944 80 2944 64 WIRE 3136 80 3136 48 WIRE 3136 80 2944 80 WIRE 3312 80 3312 48 WIRE 3312 80 3136 80 WIRE 3440 80 3440 64 WIRE 3440 80 3312 80 WIRE 3568 80 3568 64 WIRE 3568 80 3440 80 WIRE 3568 96 3568 80 WIRE 2704 128 2704 112 WIRE 2832 128 2832 80 WIRE 2832 128 2704 128 WIRE 1776 208 1648 208 WIRE 1840 208 1776 208 WIRE 1968 208 1904 208 WIRE 2048 208 1968 208 WIRE 2640 208 2128 208 WIRE 2880 208 2640 208 WIRE 1776 224 1776 208 WIRE 1968 224 1968 208 WIRE 2880 224 2880 208 WIRE 1648 240 1648 208 WIRE 2176 272 2176 80 WIRE 2400 272 2176 272 WIRE 2464 272 2400 272 WIRE 2560 272 2544 272 WIRE 2640 272 2640 208 WIRE 2640 272 2624 272 WIRE 2400 288 2400 272 WIRE 1776 320 1776 288 WIRE 1968 320 1968 288 WIRE 2880 320 2880 304 WIRE 2176 336 2176 272 WIRE 2704 352 2704 128 WIRE 2400 384 2400 352 WIRE 1648 400 1648 320 WIRE 2016 400 1648 400 WIRE 2464 432 2336 432 WIRE 2656 432 2544 432 WIRE 1648 464 1648 400 WIRE 1776 464 1648 464 WIRE 1904 464 1856 464 WIRE 2016 464 1968 464 WIRE 1648 480 1648 464 WIRE 1872 528 1760 528 WIRE 2016 528 1872 528 WIRE 1872 544 1872 528 WIRE 1760 560 1760 528 WIRE 2368 560 2368 96 WIRE 2368 560 2336 560 WIRE 2400 560 2368 560 WIRE 2704 560 2704 448 WIRE 2704 560 2480 560 WIRE 1648 576 1648 560 WIRE 2704 576 2704 560 WIRE 2016 592 1968 592 WIRE 2368 608 2368 560 WIRE 1872 624 1872 608 WIRE 1760 656 1760 640 WIRE 1968 656 1968 592 WIRE 1968 656 1760 656 WIRE 1760 672 1760 656 WIRE 2704 672 2704 656 WIRE 2176 704 2176 656 WIRE 2368 704 2368 672 WIRE 1760 752 1760 736 FLAG 2704 672 0 FLAG 1760 752 0 FLAG 1872 624 0 FLAG 1648 576 0 FLAG 2176 704 0 FLAG 1776 320 0 FLAG 1968 320 0 FLAG 2400 384 0 FLAG 2880 320 0 FLAG 2016 32 0 FLAG 1856 80 0 FLAG 3568 -32 OUT FLAG 3568 96 0 FLAG 2368 704 0 FLAG 2016 -80 IN SYMBOL RES 2688 560 R0 SYMATTR InstName R1 SYMATTR Value .67 SYMBOL cap 1744 672 R0 SYMATTR InstName C1 SYMATTR Value 220p SYMBOL cap 1856 544 R0 SYMATTR InstName C2 SYMATTR Value .1µ SYMBOL cap 1968 448 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C3 SYMATTR Value .005µ SYMBOL res 1872 448 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R2 SYMATTR Value 100K SYMBOL res 1744 544 R0 SYMATTR InstName R3 SYMATTR Value 12K SYMBOL res 1632 464 R0 SYMATTR InstName R4 SYMATTR Value 20K SYMBOL res 2496 544 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R7 SYMATTR Value 1K SYMBOL NMOS 2656 352 R0 SYMATTR InstName Q1 SYMATTR Value IRF7303 SYMBOL res 2560 416 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R8 SYMATTR Value 12 SYMBOL res 1632 224 R0 SYMATTR InstName R9 SYMATTR Value 152K SYMBOL cap 1760 224 R0 SYMATTR InstName C4 SYMATTR Value .0022µ SYMBOL cap 1952 224 R0 SYMATTR InstName C5 SYMATTR Value 100p SYMBOL schottky 1904 192 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName D1 SYMATTR Value BAT54 SYMBOL cap 2384 288 R0 SYMATTR InstName C6 SYMATTR Value 22µ SYMBOL res 2560 256 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R10 SYMATTR Value 39 SYMBOL schottky 2624 256 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName D2 SYMATTR Value BAT54 SYMBOL res 2352 0 R0 SYMATTR InstName R13 SYMATTR Value 1.32Meg SYMBOL res 2688 -80 R0 SYMATTR InstName R14 SYMATTR Value 660K SYMBOL cap 2576 -64 R0 SYMATTR InstName C7 SYMATTR Value 470p SYMBOL ind2 2960 -32 M0 WINDOW 0 1 32 Right 2 WINDOW 3 3 70 Right 2 SYMATTR InstName L1 SYMATTR Value 16µ SYMATTR SpiceLine Rser=.05 Rpar=10K SYMBOL ind2 2864 208 R0 WINDOW 0 -5 42 Right 2 WINDOW 3 -4 77 Right 2 SYMATTR InstName L3 SYMATTR Value 18.8µ SYMATTR SpiceLine Rser=.1 Rpar=10K SYMBOL ind2 2864 80 M180 WINDOW 0 -2 87 Right 2 WINDOW 3 0 44 Right 2 SYMATTR InstName L2 SYMATTR Value 100µ SYMATTR SpiceLine Rser=.05 Rpar=10K SYMBOL schottky 3040 -48 M90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName D3 SYMATTR Value MBRS340 SYMBOL cap 3120 -16 R0 SYMATTR InstName C8 SYMATTR Value 20µ SYMBOL ind2 3168 -16 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 5 56 VBottom 2 SYMATTR InstName L4 SYMATTR Value 1µ SYMATTR Type ind SYMBOL polcap 3296 -16 R0 SYMATTR InstName C9 SYMATTR Value 3.3µ SYMATTR SpiceLine Rser=.1 SYMBOL res 3424 -32 R0 SYMATTR InstName R15 SYMATTR Value 750 SYMBOL VOLTAGE 2016 -80 R0 SYMATTR InstName V1 SYMATTR Value 200 SYMBOL zener 2064 96 R270 WINDOW 0 36 32 VTop 2 WINDOW 3 -4 32 VBottom 2 SYMATTR InstName D4 SYMATTR Value BZX84C15L SYMBOL res 3552 -32 R0 SYMATTR InstName Rload SYMATTR Value 20 SYMBOL diode 2688 112 M180 WINDOW 0 28 62 Left 2 WINDOW 3 24 0 Left 2 SYMATTR InstName D5 SYMATTR Value MURS320 SYMBOL res 2144 192 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R17 SYMATTR Value 510 SYMBOL res 2160 -48 R0 SYMATTR InstName R18 SYMATTR Value 400K SYMBOL PowerProducts\\LT1242 2176 496 R0 SYMATTR InstName U1 SYMBOL zener 1904 96 R270 WINDOW 0 36 32 VTop 2 WINDOW 3 -4 32 VBottom 2 SYMATTR InstName D6 SYMATTR Value BZX84C6V2L SYMBOL cap 2352 608 R0 SYMATTR InstName C10 SYMATTR Value 50p TEXT 2896 648 Left 2 !.tran 2m TEXT 2912 -40 Bottom 2 !K1 L1 L2 L3 1 TEXT 2608 -104 Bottom 2 ;LT1242 - High Speed Current Mode Pulse Width Modulators\n300kHz Off-Line Power Supply\n(Full-wave rectifier front end circuit not simulated)\nInput: 90VAC to 240VAC (152VDC to 57VDC) Output: 20V @ 1.5A TEXT 1904 712 Left 2 ;Note:\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 © 2012 Linear Technology Inc. All rights reserved. LINE Normal 2912 288 2912 -16 2