Version 4 SHEET 1 4900 2232 WIRE 400 -208 128 -208 WIRE 464 -208 400 -208 WIRE 608 -208 464 -208 WIRE 832 -208 688 -208 WIRE 2512 -208 832 -208 WIRE 464 -160 464 -208 WIRE 832 -160 832 -208 WIRE 464 0 464 -80 WIRE 528 0 464 0 WIRE 832 0 832 -80 WIRE 832 0 784 0 WIRE 400 112 400 -208 WIRE 528 112 400 112 WIRE 832 112 784 112 WIRE 832 224 832 112 WIRE 2512 256 2512 -208 WIRE 528 272 480 272 WIRE 128 384 128 -208 WIRE 2672 416 2608 416 WIRE 880 464 720 464 WIRE 1168 464 880 464 WIRE 1344 464 1344 368 WIRE 1344 464 1168 464 WIRE 1744 464 1344 464 WIRE 720 496 720 464 WIRE 1824 512 1648 512 WIRE 2096 512 1888 512 WIRE 2512 544 2512 336 WIRE 2608 560 2608 416 WIRE 2608 560 2560 560 WIRE 720 608 720 576 WIRE 1168 608 1168 464 WIRE 2608 608 2560 608 WIRE 2672 608 2672 416 WIRE 1744 624 1744 464 WIRE 944 640 816 640 WIRE 1136 640 944 640 WIRE 1360 640 1216 640 WIRE 1488 640 1360 640 WIRE 1648 640 1648 512 WIRE 1648 640 1568 640 WIRE 1712 640 1648 640 WIRE 2096 656 2096 512 WIRE 2096 656 1776 656 WIRE 880 672 880 464 WIRE 1136 672 1040 672 WIRE 1712 672 1648 672 WIRE 816 688 816 640 WIRE 848 688 816 688 WIRE 944 704 944 640 WIRE 944 704 912 704 WIRE 480 720 480 272 WIRE 480 720 416 720 WIRE 848 720 480 720 WIRE 2608 720 2608 608 WIRE 2672 720 2672 688 WIRE 1648 736 1648 672 WIRE 416 752 416 720 WIRE 1040 752 1040 672 WIRE 1152 752 1152 704 WIRE 1168 752 1168 704 WIRE 1168 752 1152 752 WIRE 1184 752 1184 704 WIRE 1184 752 1168 752 WIRE 480 768 480 720 WIRE 128 880 128 464 WIRE 416 880 416 816 WIRE 416 880 128 880 WIRE 480 880 480 848 WIRE 480 880 416 880 WIRE 880 880 880 736 WIRE 880 880 480 880 WIRE 1040 880 1040 832 WIRE 1040 880 880 880 WIRE 1168 880 1168 752 WIRE 1168 880 1040 880 WIRE 1648 880 1648 816 WIRE 1648 880 1168 880 WIRE 1744 880 1744 688 WIRE 1744 880 1648 880 WIRE 2512 880 2512 624 WIRE 2512 880 1744 880 WIRE 3216 976 3216 880 WIRE 416 912 416 880 WIRE 3216 976 2544 976 WIRE 3440 976 3216 976 WIRE 3440 1088 3440 976 WIRE 4336 1104 3616 1104 WIRE 3616 1168 3616 1104 WIRE 3440 1216 3440 1168 WIRE 3440 1216 3152 1216 WIRE 3552 1216 3440 1216 WIRE 1360 1232 1360 640 WIRE 1904 1264 1632 1264 WIRE 3152 1312 3152 1216 WIRE 2544 1328 2544 976 WIRE 1632 1344 1632 1264 WIRE 2512 1360 2416 1360 WIRE 2688 1360 2592 1360 WIRE 2816 1360 2768 1360 WIRE 3008 1360 2816 1360 WIRE 3088 1360 3008 1360 WIRE 1360 1392 1360 1312 WIRE 1568 1392 1360 1392 WIRE 2096 1392 2096 656 WIRE 2512 1392 2096 1392 WIRE 2416 1424 2416 1360 WIRE 1360 1440 1360 1392 WIRE 2816 1456 2816 1360 WIRE 2528 1488 2528 1424 WIRE 2544 1488 2544 1424 WIRE 2544 1488 2528 1488 WIRE 2560 1488 2560 1424 WIRE 2560 1488 2544 1488 WIRE 1360 1568 1360 1520 WIRE 1360 1568 816 1568 WIRE 1520 1568 1360 1568 WIRE 1632 1568 1632 1440 WIRE 1632 1568 1520 1568 WIRE 2416 1568 2416 1504 WIRE 2416 1568 1632 1568 WIRE 2544 1568 2544 1488 WIRE 2544 1568 2416 1568 WIRE 2816 1568 2816 1536 WIRE 2816 1568 2544 1568 WIRE 3152 1568 3152 1408 WIRE 3152 1568 2816 1568 WIRE 3616 1568 3616 1264 WIRE 3616 1568 3152 1568 WIRE 4592 1568 4592 1360 WIRE 4592 1568 3616 1568 WIRE 4896 1568 4592 1568 WIRE 1520 1616 1520 1568 WIRE 1904 1632 1904 1264 WIRE 3008 1632 3008 1360 WIRE 3008 1632 1904 1632 FLAG 2608 720 0 FLAG 2672 720 0 FLAG 832 224 0 FLAG 416 912 0 FLAG 720 608 0 FLAG 1344 368 5V FLAG 1520 1616 0 FLAG 3216 880 5V SYMBOL voltage 128 368 R0 WINDOW 123 0 0 Left 0 WINDOW 39 24 124 Left 2 SYMATTR SpiceLine Rser=0.01 SYMATTR InstName V1 SYMATTR Value 32 SYMBOL sw 2512 640 R180 SYMATTR InstName S1 SYMBOL res 2496 240 R0 SYMATTR InstName R1 SYMATTR Value 3.14 SYMBOL voltage 2672 592 R0 WINDOW 123 0 0 Left 0 WINDOW 39 24 124 Left 2 SYMATTR SpiceLine Rser=0.1 SYMATTR InstName V2 SYMATTR Value PWL(0 -1 80m -1 80001u +1 5200m +1 5200.001m -1 6s -1 6000.001m +1) SYMBOL OpAmps\\LTC6101 656 128 M0 SYMATTR InstName U1 SYMBOL res 592 -192 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 0 56 VBottom 2 SYMATTR InstName R2 SYMATTR Value 0.01 SYMBOL res 448 -176 R0 SYMATTR InstName R3 SYMATTR Value 100 SYMBOL res 816 -176 R0 SYMATTR InstName R4 SYMATTR Value 100 SYMBOL res 464 752 R0 SYMATTR InstName R5 SYMATTR Value 2k SYMBOL OpAmps\\LT1006 880 640 R0 SYMATTR InstName U2 SYMBOL voltage 720 480 R0 WINDOW 123 0 0 Left 0 WINDOW 39 -46 -26 Left 2 SYMATTR SpiceLine Rser=0.01 SYMATTR InstName V3 SYMATTR Value 5 SYMBOL cap 400 752 R0 SYMATTR InstName C1 SYMATTR Value 1n SYMATTR SpiceLine Rser=0.03 SYMBOL OpAmps\\LT1006 1744 592 R0 SYMATTR InstName U3 SYMBOL voltage 1040 736 R0 WINDOW 123 0 0 Left 0 WINDOW 39 24 124 Left 2 SYMATTR SpiceLine Rser=0.1 SYMATTR InstName V4 SYMATTR Value 0.6 SYMBOL cap 1888 496 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C2 SYMATTR Value 10µ SYMATTR SpiceLine Rser=0.03 SYMBOL res 1584 624 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R6 SYMATTR Value 10k SYMBOL Comparators\\LT1713 1168 656 R0 SYMATTR InstName U4 SYMBOL voltage 1648 720 R0 WINDOW 123 0 0 Left 0 WINDOW 39 24 124 Left 2 SYMATTR SpiceLine Rser=0.1 SYMATTR InstName V5 SYMATTR Value 0.5 SYMBOL npn 1568 1344 R0 SYMATTR InstName Q1 SYMATTR Value 2N3904 SYMBOL res 1344 1216 R0 SYMATTR InstName R7 SYMATTR Value 2k SYMBOL res 1344 1424 R0 SYMATTR InstName R8 SYMATTR Value 10k SYMBOL Comparators\\LT1713 2544 1376 R0 SYMATTR InstName U5 SYMBOL voltage 2416 1408 R0 WINDOW 123 0 0 Left 0 WINDOW 39 -168 56 Left 2 SYMATTR SpiceLine Rser=0.01 SYMATTR InstName V6 SYMATTR Value 4 SYMBOL npn 3088 1312 R0 SYMATTR InstName Q2 SYMATTR Value 2N3904 SYMBOL res 2800 1440 R0 SYMATTR InstName R10 SYMATTR Value 10k SYMBOL res 2784 1344 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R11 SYMATTR Value 2k SYMBOL npn 3552 1168 R0 SYMATTR InstName Q3 SYMATTR Value 2N3904 SYMBOL res 3424 1072 R0 SYMATTR InstName R9 SYMATTR Value 2k TEXT 96 936 Left 2 !.tran 0 8 0 startup TEXT 1896 -64 Left 4 !.model sw sw(ron=1m) TEXT 3904 1256 Left 5 ;Turn on to\ndisable \nsynchronous\nFETs TEXT 4432 856 Left 5 ;Synchronous\nFET\ndriver TEXT 4352 1104 Left 4 ;DISABLE TEXT 2552 200 Left 6 ;LOAD TEXT 272 -976 Left 7 ;WHENEVER LOAD CURRENT GOES BELOW 3A,\nTHE SYNCH FET driver MUST BE IMMEDIATELY DISABLED.\n \nWhenever the load has been above 3A for at least 800ms (approx),\nthen the Synch FET driver must be enabled. TEXT 1248 488 Left 3 ;Needs\nsome\nhysteresis TEXT 1632 272 Left 6 ;Integrator\n(delay) TEXT 2728 504 Left 6 ;Load switch TEXT 880 32 Left 5 ;Current\nMonitor LINE Normal 3632 1264 3920 1424 2 LINE Normal 3744 1280 3632 1264 2 LINE Normal 3696 1376 3744 1280 2 LINE Normal 3632 1264 3696 1376 2 LINE Normal 4896 1024 4800 1024 2 LINE Normal 4896 1232 4800 1232 2 LINE Normal 4576 816 4576 720 2 LINE Normal 4528 720 4624 720 2 RECTANGLE Normal 4800 1360 4336 816 2