Version 4 SHEET 1 2276 980 WIRE 832 -256 16 -256 WIRE 192 -176 128 -176 WIRE 320 -176 272 -176 WIRE 384 -176 320 -176 WIRE 688 -176 480 -176 WIRE -352 -80 -592 -80 WIRE -96 -80 -352 -80 WIRE 16 -80 16 -256 WIRE 16 -80 -96 -80 WIRE 128 -80 128 -176 WIRE 128 -80 16 -80 WIRE 208 -80 128 -80 WIRE 352 -80 288 -80 WIRE 496 -80 352 -80 WIRE 688 -80 688 -176 WIRE 688 -80 592 -80 WIRE 736 -80 688 -80 WIRE 896 -80 736 -80 WIRE 1024 -80 896 -80 WIRE 1168 -80 1024 -80 WIRE -592 -64 -592 -80 WIRE 896 -64 896 -80 WIRE 1024 -64 1024 -80 WIRE 1168 -64 1168 -80 WIRE 464 -16 464 -128 WIRE 576 -16 576 -32 WIRE -352 0 -352 -80 WIRE 320 0 320 -176 WIRE 320 0 240 0 WIRE 1280 0 1216 0 WIRE 1280 16 1280 0 WIRE -592 32 -592 16 WIRE 896 32 896 0 WIRE 1024 32 1024 16 WIRE 1168 32 1168 16 WIRE -96 80 -96 -80 WIRE 16 80 16 -80 WIRE 128 80 128 -80 WIRE 240 80 240 0 WIRE 352 80 352 -80 WIRE 464 80 464 64 WIRE 576 80 576 64 WIRE -352 96 -352 80 WIRE -240 96 -352 96 WIRE 736 96 736 -80 WIRE -352 112 -352 96 WIRE 1280 112 1280 96 WIRE -240 144 -240 96 WIRE -192 144 -240 144 WIRE 688 144 688 -80 WIRE 688 144 672 144 WIRE -352 208 -352 192 WIRE -192 208 -352 208 WIRE 736 208 736 176 WIRE 736 208 672 208 WIRE -352 224 -352 208 WIRE -192 272 -240 272 WIRE 736 272 672 272 WIRE 832 272 832 -256 WIRE 832 272 816 272 WIRE -352 320 -352 304 WIRE -240 336 -240 272 WIRE -192 336 -240 336 WIRE 720 336 672 336 WIRE -240 352 -240 336 WIRE 720 400 720 336 WIRE 736 400 720 400 WIRE 832 400 832 272 WIRE 832 400 816 400 WIRE -240 432 -240 416 WIRE -96 448 -96 432 WIRE 576 448 576 432 WIRE 576 528 576 512 FLAG 896 32 0 FLAG 1024 32 0 FLAG -96 448 0 FLAG 576 528 0 FLAG -240 432 0 FLAG -592 32 0 FLAG -592 -80 IN FLAG 1168 32 0 FLAG 1280 112 0 FLAG 1216 -48 0 FLAG 1024 -80 OUT FLAG -352 320 0 SYMBOL LTC4282 240 240 R0 SYMATTR InstName U1 SYMATTR Value2 OVRTRY=1 UVRTRY=1 OCRTRY=1 SYMBOL res 560 -32 R0 SYMATTR InstName R1 SYMATTR Value 10 SYMBOL nmos 384 -128 R270 WINDOW 0 79 47 VTop 2 WINDOW 3 51 42 VTop 2 SYMATTR InstName Q1 SYMATTR Value Si7868DP SYMBOL res 448 -32 R0 SYMATTR InstName R2 SYMATTR Value 10 SYMBOL cap 880 -64 R0 SYMATTR InstName C1 SYMATTR Value 100u SYMBOL res 288 -192 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R3 SYMATTR Value .25m SYMBOL res 304 -96 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R4 SYMATTR Value .25m SYMBOL cap 560 448 R0 SYMATTR InstName C2 SYMATTR Value 10n SYMBOL cap -256 352 R0 SYMATTR InstName C3 SYMATTR Value 1u SYMBOL voltage -592 -80 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V1 SYMATTR Value PWL(0 0 1m 12) SYMBOL sw 1168 -80 M0 WINDOW 0 -15 3 Right 2 WINDOW 3 -24 98 Right 2 SYMATTR InstName S1 SYMATTR Value SLD SYMBOL voltage 1280 0 R0 SYMATTR InstName V2 SYMATTR Value PULSE(0 1 500m 10n 10n 10m 100) SYMBOL res 720 80 R0 SYMATTR InstName R5 SYMATTR Value 30.1K SYMBOL res 832 256 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R6 SYMATTR Value 10K SYMBOL res 832 384 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R7 SYMATTR Value 10K SYMBOL res -368 -16 R0 SYMATTR InstName R8 SYMATTR Value 34.8K SYMBOL res -368 96 R0 SYMATTR InstName R9 SYMATTR Value 1.18K SYMBOL res -368 208 R0 SYMATTR InstName R10 SYMATTR Value 3.4K SYMBOL nmos 496 -32 R270 WINDOW 0 79 47 VTop 2 WINDOW 3 51 42 VTop 2 SYMATTR InstName Q2 SYMATTR Value Si7868DP SYMBOL res 1008 -80 R0 SYMATTR InstName Rload SYMATTR Value .6 TEXT 872 488 Left 2 !.tran 2\n.model SLD SW(Ron=50m Roff=5 Vt=.5 Vh=-.3) TEXT -40 544 Left 2 ;Enter FETBADTIMOUT in seconds on symbol.\nFETBADTIMOUT < 1e-30 Disables FETBAD check\n \nILIM_ADJUST controls FB as per datasheet.\nA value of 4 ( 1 0 0 ) is default\nFB values in mV \n \nValue (B7 B6 B5) FB LOW FB HIGH\n0 ( 0 0 0 ) 3.7500 12.5\n1 ( 0 0 1 ) 4.6875 15.625\n2 ( 0 1 0 ) 5.6250 18.75\n3 ( 0 1 1 ) 6.5625 21.875\n4 ( 1 0 0 ) 7.5000 25\n5 ( 1 0 1 ) 8.4375 28.125\n6 ( 1 1 0 ) 9.3750 31.25\n7 ( 1 1 1 ) 10.3125 34.375