Version 4 SHEET 1 5945676 13421556 WIRE 2800 -128 2016 -128 WIRE 2016 -112 2016 -128 WIRE 2800 -64 2800 -128 WIRE 2864 -64 2800 -64 WIRE 3008 -64 2928 -64 WIRE 3232 -64 3072 -64 WIRE 3552 -64 3296 -64 WIRE 3600 -64 3552 -64 WIRE 3728 -64 3680 -64 WIRE 3936 -64 3728 -64 WIRE 2864 -48 2864 -64 WIRE 2928 -48 2928 -64 WIRE 3552 -48 3552 -64 WIRE 3728 -48 3728 -64 WIRE 3936 -48 3936 -64 WIRE 2016 -16 2016 -32 WIRE 2864 48 2864 32 WIRE 2864 48 2800 48 WIRE 2928 48 2928 32 WIRE 3552 48 3552 16 WIRE 3552 48 2928 48 WIRE 3728 48 3728 16 WIRE 3728 48 3552 48 WIRE 3936 48 3936 32 WIRE 3936 48 3728 48 WIRE 3936 64 3936 48 WIRE 1920 80 1856 80 WIRE 2064 80 1984 80 WIRE 2176 80 2176 -16 WIRE 2176 80 2128 80 WIRE 2800 96 2800 48 WIRE 2800 96 2672 96 WIRE 1776 208 1680 208 WIRE 1840 208 1776 208 WIRE 1968 208 1904 208 WIRE 2048 208 1968 208 WIRE 2608 208 2128 208 WIRE 1776 224 1776 208 WIRE 1968 224 1968 208 WIRE 2864 224 2864 208 WIRE 2176 272 2176 80 WIRE 2400 272 2176 272 WIRE 2432 272 2400 272 WIRE 2528 272 2512 272 WIRE 2608 272 2608 208 WIRE 2608 272 2592 272 WIRE 2400 288 2400 272 WIRE 1680 304 1680 208 WIRE 1776 304 1776 288 WIRE 1968 304 1968 288 WIRE 2864 320 2864 304 WIRE 2176 336 2176 272 WIRE 2672 352 2672 96 WIRE 2400 368 2400 352 WIRE 3008 384 2880 384 WIRE 1680 400 1680 384 WIRE 2016 400 1680 400 WIRE 2464 432 2336 432 WIRE 2624 432 2592 432 WIRE 3008 448 3008 384 WIRE 1680 464 1680 400 WIRE 1776 464 1680 464 WIRE 1904 464 1856 464 WIRE 2016 464 1968 464 WIRE 1680 480 1680 464 WIRE 2592 480 2592 432 WIRE 2880 480 2880 384 WIRE 2880 480 2592 480 WIRE 1872 528 1760 528 WIRE 2016 528 1872 528 WIRE 1872 544 1872 528 WIRE 1760 560 1760 528 WIRE 2368 560 2368 32 WIRE 2368 560 2336 560 WIRE 2480 560 2368 560 WIRE 1680 576 1680 560 WIRE 2368 576 2368 560 WIRE 2672 576 2672 448 WIRE 3008 576 3008 528 WIRE 2016 592 1968 592 WIRE 1872 624 1872 608 WIRE 2368 656 2368 640 WIRE 2672 672 2672 656 WIRE 1760 688 1760 640 WIRE 1968 688 1968 592 WIRE 1968 688 1760 688 WIRE 1760 704 1760 688 WIRE 2176 704 2176 656 WIRE 1760 784 1760 768 FLAG 2672 672 0 FLAG 1760 784 0 FLAG 1872 624 0 FLAG 1680 576 0 FLAG 2176 704 0 FLAG 1776 304 0 FLAG 1968 304 0 FLAG 2400 368 0 FLAG 2864 320 0 FLAG 2016 -16 0 FLAG 1856 80 0 FLAG 3936 -64 OUT FLAG 3936 64 0 FLAG 2016 -128 IN FLAG 2368 656 0 FLAG 3008 576 0 SYMBOL RES 2656 560 R0 SYMATTR InstName R1 SYMATTR Value .67 SYMBOL cap 1744 704 R0 SYMATTR InstName C1 SYMATTR Value 70p 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 .01µ 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 1664 464 R0 SYMATTR InstName R4 SYMATTR Value 20K SYMBOL res 2576 544 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R5 SYMATTR Value 500 SYMBOL NMOS 2624 352 R0 SYMATTR InstName Q1 SYMATTR Value STW11NM80 SYMBOL res 2560 416 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R6 SYMATTR Value 12 SYMBOL res 1664 288 R0 SYMATTR InstName R7 SYMATTR Value 10k 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 2528 256 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R8 SYMATTR Value 390 SYMBOL schottky 2592 256 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName D2 SYMATTR Value BAT54 SYMBOL res 2352 -64 R0 SYMATTR InstName R9 SYMATTR Value 1.32Meg SYMBOL ind2 2944 -64 M0 WINDOW 0 1 32 Right 2 WINDOW 3 1 60 Right 2 SYMATTR InstName L1 SYMATTR Value 83m SYMATTR SpiceLine Rser=.05 SYMBOL ind2 2848 208 R0 WINDOW 0 -4 45 Right 2 WINDOW 3 -4 72 Right 2 SYMATTR InstName L2 SYMATTR Value 152µ SYMATTR SpiceLine Rser=.1 SYMBOL ind2 2848 48 M180 WINDOW 0 -4 79 Right 2 WINDOW 3 -3 42 Right 2 SYMATTR InstName L3 SYMATTR Value 258µ SYMATTR SpiceLine Rser=.05 SYMBOL diode 3008 -80 M90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName D3 SYMATTR Value RFU02VS8S SYMATTR Description Schottky diode SYMATTR Type schottky SYMBOL cap 3536 -48 R0 SYMATTR InstName C8 SYMATTR Value 10n SYMBOL ind2 3584 -48 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 5 56 VBottom 2 SYMATTR InstName L4 SYMATTR Value 500µ SYMATTR Type ind SYMATTR SpiceLine Rpar=100 SYMBOL polcap 3712 -48 R0 SYMATTR InstName C9 SYMATTR Value 30p SYMBOL VOLTAGE 2016 -128 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V1 SYMATTR Value 325 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 2144 192 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R12 SYMATTR Value 510 SYMBOL res 2160 -112 R0 SYMATTR InstName R13 SYMATTR Value 400K SYMBOL PowerProducts\\LT1244 2176 496 R0 SYMATTR InstName U1 SYMBOL zener 1920 96 R270 WINDOW 0 36 32 VTop 2 WINDOW 3 -4 32 VBottom 2 SYMATTR InstName D6 SYMATTR Value BZX84C6V2L SYMBOL cap 2352 576 R0 SYMATTR InstName C10 SYMATTR Value 50p SYMBOL current 3936 -48 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName I1 SYMATTR Value 5m SYMBOL diode 3232 -48 R270 WINDOW 0 32 32 VTop 2 WINDOW 3 0 32 VBottom 2 SYMATTR InstName D7 SYMATTR Value RFU02VS8S SYMBOL voltage 3008 432 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V2 SYMATTR Value PULSE(0 10 0 0 0 25µ 50µ) TEXT 2856 664 Left 2 !.tran 1.2m TEXT 2896 -72 Bottom 2 !K1 L1 L2 L3 1 TEXT 2560 -144 Bottom 2 ;LT1244 - 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 1984 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 2896 304 2896 -64 2