Version 4 SHEET 1 1224 680 WIRE -64 -112 -160 -112 WIRE 224 -112 -64 -112 WIRE 384 -112 224 -112 WIRE -160 -96 -160 -112 WIRE 224 -80 224 -112 WIRE -64 -16 -64 -112 WIRE 80 -16 -64 -16 WIRE 496 -16 368 -16 WIRE 656 -16 544 -16 WIRE 768 -16 720 -16 WIRE 800 -16 768 -16 WIRE 912 -16 880 -16 WIRE 1008 -16 912 -16 WIRE -160 0 -160 -16 WIRE 912 0 912 -16 WIRE 1008 0 1008 -16 WIRE -64 80 -64 64 WIRE 80 80 -64 80 WIRE 384 80 384 -112 WIRE 496 80 496 64 WIRE 496 80 384 80 WIRE 544 80 544 64 WIRE 560 80 544 80 WIRE 496 96 496 80 WIRE 544 96 544 80 WIRE 912 96 912 64 WIRE 1008 96 1008 80 WIRE -64 176 -64 160 WIRE 80 176 -16 176 WIRE 496 176 368 176 WIRE 656 176 544 176 WIRE 768 176 768 -16 WIRE 768 176 720 176 WIRE -16 192 -16 176 WIRE 80 272 64 272 WIRE 400 272 368 272 WIRE 496 272 480 272 WIRE -16 288 -16 272 WIRE 0 368 -16 368 WIRE 80 368 64 368 WIRE 384 368 368 368 WIRE 480 368 464 368 WIRE 224 448 224 432 FLAG 224 448 0 FLAG -64 176 0 FLAG 64 272 0 FLAG -16 368 0 FLAG -160 0 0 FLAG -16 288 0 FLAG 480 368 0 FLAG 496 272 0 FLAG 560 80 0 FLAG 912 96 0 FLAG 1008 96 0 FLAG -160 -112 IN FLAG 1008 -16 OUT SYMBOL PowerProducts\\LT3999 224 176 R0 SYMATTR InstName U1 SYMBOL voltage -160 -112 R0 SYMATTR InstName V1 SYMATTR Value 12 SYMBOL res -80 -32 R0 SYMATTR InstName R1 SYMATTR Value 255K SYMBOL res -80 64 R0 SYMATTR InstName R2 SYMATTR Value 10K SYMBOL cap 64 352 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C1 SYMATTR Value .01µ SYMBOL res -32 176 R0 SYMATTR InstName R3 SYMATTR Value 28K SYMBOL res 368 384 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 0 56 VBottom 2 SYMATTR InstName R4 SYMATTR Value 49.9K SYMBOL res 384 288 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 0 56 VBottom 2 SYMATTR InstName R5 SYMATTR Value 15.8K SYMBOL ind2 480 -32 R0 WINDOW 0 0 42 Right 2 WINDOW 3 -1 79 Right 2 SYMATTR InstName L1 SYMATTR Value 82.5µ SYMATTR Type ind SYMATTR SpiceLine Rser=50m SYMBOL ind2 480 80 R0 WINDOW 0 -3 36 Right 2 WINDOW 3 -2 69 Right 2 SYMATTR InstName L2 SYMATTR Value 82.5µ SYMATTR Type ind SYMATTR SpiceLine Rser=50m SYMBOL ind2 560 -32 M0 WINDOW 0 0 43 Right 2 WINDOW 3 -1 76 Right 2 SYMATTR InstName L3 SYMATTR Value 165µ SYMATTR Type ind SYMATTR SpiceLine Rser=72m SYMBOL ind2 560 80 M0 WINDOW 0 -3 41 Right 2 WINDOW 3 -1 73 Right 2 SYMATTR InstName L4 SYMATTR Value 165µ SYMATTR Type ind SYMATTR SpiceLine Rser=72m SYMBOL schottky 656 0 R270 WINDOW 0 32 32 VTop 2 WINDOW 3 0 32 VBottom 2 SYMATTR InstName D1 SYMATTR Value MBRS1100 SYMATTR Description Diode SYMATTR Type diode SYMBOL schottky 656 192 R270 WINDOW 0 32 32 VTop 2 WINDOW 3 0 32 VBottom 2 SYMATTR InstName D2 SYMATTR Value MBRS1100 SYMATTR Description Diode SYMATTR Type diode SYMBOL ind 784 0 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 5 56 VBottom 2 SYMATTR InstName L5 SYMATTR Value 15.3µ SYMATTR SpiceLine Rser=20m SYMBOL cap 896 0 R0 SYMATTR InstName C2 SYMATTR Value 10µ SYMATTR SpiceLine Rser=10m SYMBOL res 992 -16 R0 SYMATTR InstName Rout SYMATTR Value 30 TEXT 512 -24 Bottom 2 !K1 L1 L2 L3 L4 1 TEXT 608 368 Left 2 !.tran 1.5m startup