Version 4 SHEET 1 4060 4364 WIRE 1936 -6736 1792 -6736 WIRE 2080 -6736 1936 -6736 WIRE 2496 -6736 2080 -6736 WIRE 2752 -6736 2496 -6736 WIRE 2864 -6736 2752 -6736 WIRE 2928 -6736 2864 -6736 WIRE 3168 -6736 2928 -6736 WIRE 3376 -6736 3232 -6736 WIRE 3488 -6736 3376 -6736 WIRE 2496 -6688 2496 -6736 WIRE 3488 -6688 3488 -6736 WIRE 1792 -6640 1792 -6736 WIRE 1936 -6624 1936 -6736 WIRE 3216 -6576 3104 -6576 WIRE 3376 -6576 3376 -6736 WIRE 3376 -6576 3216 -6576 WIRE 3488 -6576 3488 -6608 WIRE 3104 -6560 3104 -6576 WIRE 3488 -6544 3488 -6576 WIRE 1936 -6528 1936 -6544 WIRE 2128 -6528 1936 -6528 WIRE 2496 -6528 2496 -6608 WIRE 2496 -6528 2320 -6528 WIRE 3216 -6480 3216 -6576 WIRE 2336 -6464 2320 -6464 WIRE 3104 -6464 3104 -6480 WIRE 3136 -6464 3104 -6464 WIRE 1792 -6448 1792 -6560 WIRE 1840 -6448 1792 -6448 WIRE 2128 -6432 1936 -6432 WIRE 2432 -6432 2320 -6432 WIRE 2928 -6432 2928 -6736 WIRE 2336 -6400 2336 -6464 WIRE 1792 -6368 1792 -6448 WIRE 3104 -6368 3104 -6464 WIRE 2752 -6320 2752 -6736 WIRE 2928 -6304 2928 -6352 WIRE 2928 -6304 2800 -6304 WIRE 2928 -6288 2928 -6304 WIRE 3056 -6288 2928 -6288 WIRE 1840 -6272 1840 -6448 WIRE 2192 -6272 1840 -6272 WIRE 2240 -6272 2192 -6272 WIRE 2656 -6272 2240 -6272 WIRE 1792 -6240 1792 -6304 WIRE 2656 -6224 2656 -6272 WIRE 3216 -6192 3216 -6384 WIRE 2080 -6160 2080 -6736 WIRE 2304 -6160 2080 -6160 WIRE 2368 -6160 2304 -6160 WIRE 3104 -6160 3104 -6272 WIRE 2080 -6144 2080 -6160 WIRE 2368 -6144 2368 -6160 WIRE 2752 -6144 2752 -6224 WIRE 2752 -6144 2704 -6144 WIRE 2928 -6128 2928 -6288 WIRE 2928 -6112 2928 -6128 WIRE 2304 -6080 2304 -6160 WIRE 3216 -6080 3216 -6112 WIRE 2192 -6064 2080 -6064 WIRE 2272 -6064 2192 -6064 WIRE 2368 -6048 2368 -6064 WIRE 2368 -6048 2336 -6048 WIRE 2400 -6048 2368 -6048 WIRE 2528 -6048 2480 -6048 WIRE 2848 -6048 2848 -6128 WIRE 2848 -6048 2592 -6048 WIRE 2880 -6048 2848 -6048 WIRE 2240 -6032 2240 -6272 WIRE 2272 -6032 2240 -6032 WIRE 1936 -5984 1936 -6432 WIRE 2080 -5984 2080 -6064 WIRE 2192 -5984 2192 -6064 WIRE 2160 -5952 2128 -5952 WIRE 2928 -5936 2928 -6048 WIRE 1824 -5920 1744 -5920 WIRE 1824 -5904 1824 -5920 WIRE 1888 -5904 1824 -5904 WIRE 1824 -5872 1824 -5904 WIRE 1872 -5872 1824 -5872 WIRE 1936 -5872 1936 -5888 WIRE 1744 -5856 1744 -5920 WIRE 2752 -5824 2752 -6144 WIRE 2080 -5808 2080 -5904 WIRE 2192 -5808 2192 -5920 WIRE 2192 -5808 2080 -5808 WIRE 2304 -5808 2304 -6016 WIRE 2304 -5808 2192 -5808 WIRE 1872 -5792 1872 -5872 WIRE 1888 -5792 1872 -5792 WIRE 2928 -5776 2928 -5936 WIRE 2496 -5696 2496 -6528 WIRE 2880 -5696 2496 -5696 WIRE 1936 -5680 1936 -5776 WIRE 1936 -5568 1936 -5616 WIRE 2656 -5568 2656 -6128 WIRE 2656 -5568 1936 -5568 WIRE 2752 -5568 2752 -5744 WIRE 2752 -5568 2656 -5568 WIRE 2928 -5568 2928 -5680 WIRE 2928 -5568 2752 -5568 WIRE 2928 -5552 2928 -5568 FLAG 1936 -5568 0 FLAG 2304 -5808 0 FLAG 2336 -6400 0 FLAG 2192 -6272 LEMOUT2 FLAG 2192 -6064 AMPS FLAG 2928 -5552 0 FLAG 2864 -6736 RUN FLAG 3488 -6544 0 FLAG 2928 -6128 r-scr FLAG 3488 -6576 Neg FLAG 3104 -6160 0 FLAG 2928 -5936 MCRK FLAG 2848 -6128 MCRG FLAG 1744 -5776 0 FLAG 3216 -6080 0 FLAG 1792 -6240 0 SYMBOL res 2352 -6160 R0 SYMATTR InstName R17 SYMATTR Value 5K SYMBOL res 1920 -6640 R0 SYMATTR InstName R20 SYMATTR Value 1K SYMBOL tl431 2176 -5984 R0 WINDOW 0 80 12 Left 2 WINDOW 38 85 45 Center 2 SYMATTR InstName U25 SYMBOL pot 2064 -5888 M180 WINDOW 3 -100 -172 Left 2 SYMATTR Value Rt=1K set=.8 SYMATTR InstName U31 SYMBOL nmos 1888 -5984 R0 SYMATTR InstName M1 SYMATTR Value 2N7000 SYMBOL nmos 1888 -5872 R0 SYMATTR InstName M2 SYMATTR Value 2N7000 SYMBOL Optos\\4N25 2224 -6464 R0 SYMATTR InstName U15 SYMBOL res 2064 -6160 R0 SYMATTR InstName R32 SYMATTR Value 1K SYMBOL LED 1920 -5680 R0 SYMATTR InstName D2 SYMATTR Value NSCW100 SYMATTR Description Diode SYMATTR Type diode SYMBOL res 3232 -6096 R180 WINDOW 0 -67 57 Left 2 WINDOW 3 36 40 Left 2 SYMATTR InstName Load SYMATTR Value .1 SYMBOL nmos 2880 -5776 R0 SYMATTR InstName M3 SYMATTR Value BS170 SYMBOL Misc\\battery 3488 -6704 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V1 SYMATTR Value 14 SYMBOL IRF4905 3152 -6464 R0 WINDOW 38 97 59 Left 2 SYMATTR InstName U8 SYMBOL res 3088 -6576 R0 SYMATTR InstName R14 SYMATTR Value 5K SYMBOL res 2912 -6448 R0 SYMATTR InstName R22 SYMATTR Value 1K SYMBOL nmos 3056 -6368 R0 SYMATTR InstName M4 SYMATTR Value BS170 SYMBOL res 2480 -6704 R0 SYMATTR InstName R33 SYMATTR Value 5k SYMBOL Comparators\\LT1018 2304 -6048 R0 SYMATTR InstName U20 SYMBOL res 2496 -6064 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R27 SYMATTR Value 5K SYMBOL LED 2592 -6064 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName D3 SYMATTR Value NSPW500BS SYMATTR Description Diode SYMATTR Type diode SYMBOL voltage 1744 -5872 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V2 SYMATTR Value PWL(0 .7 15m .7 20m 7 25m .7) SYMBOL MCR100-6 2912 -6112 R0 SYMATTR InstName U1 SYMBOL time\ controlled\ switch\ NO 3200 -6736 R90 WINDOW 39 0 0 VTop 2 WINDOW 40 21 0 VTop 2 SYMATTR SpiceLine TURN_ON=2m SYMATTR SpiceLine2 TURN_OFF=25m SYMATTR InstName U2 SYMBOL res 1776 -6656 R0 SYMATTR InstName R1 SYMATTR Value 5k SYMBOL cap 1776 -6368 R0 SYMATTR InstName C1 SYMATTR Value 5µ SYMBOL pmos 2800 -6224 R180 SYMATTR InstName M5 SYMBOL res 2736 -5840 R0 SYMATTR InstName R2 SYMATTR Value 10k SYMBOL nmos 2704 -6224 M0 SYMATTR InstName M6 SYMATTR Value BS170 TEXT 3072 -5912 Left 2 !.tran 30m uic TEXT 2176 -5792 Left 2 ;RAK TEXT 1976 -5880 Left 2 ;SGD TEXT 2112 -6536 Left 2 ;1 TEXT 2112 -6440 Left 2 ;2 TEXT 2328 -6480 Left 2 ;4 TEXT 2328 -6544 Left 2 ;5 TEXT 2016 -5648 Left 2 ;GREEN TEXT 2872 -6032 Left 2 ;~.6v TEXT 3144 -6264 Left 2 ;SGD TEXT 2968 -6008 Left 2 ;KGA TEXT 3264 -6328 Left 2 ;GDS TEXT 1664 -5976 Left 4 ;and gate TEXT 3016 -5768 Left 4 ;resets the SCR when \nthe and gate is satisfied TEXT 3352 -6480 Left 2 ;Battery power is applied to the circuit all the time, \nU8 FET turns off when the key is off or the current \nsensor exceeds the set value TEXT 3248 -6288 Left 2 ;When the key is on U8 FET is turned on by M4 to supply power to \nthe load unless the current limit set point has bee exceeded (LEMOUT2) TEXT 2640 -6352 Left 2 ;sim only TEXT 2664 -5864 Left 2 ;sim only TEXT 1568 -6200 Left 2 ;LEMOUT2 comes from a \nHall Device which senses current TEXT 2160 -5688 Left 2 ;U25 sets max current level, compared to LEMOUT2\nby U20 and turns on the SCR, D3 makes sure the \ncomparator has actually switched states. TEXT 1504 -6040 Left 2 ;and gate makes sure the input causing \nthe current to be too high has been removed RECTANGLE Normal 2816 -5600 2592 -6416 2