Version 4 SHEET 1 1380 680 WIRE 0 -112 -112 -112 WIRE 192 -112 0 -112 WIRE 528 -112 192 -112 WIRE 656 -112 576 -112 WIRE 768 -112 720 -112 WIRE 880 -112 768 -112 WIRE -112 -96 -112 -112 WIRE 528 -96 528 -112 WIRE 576 -96 576 -112 WIRE 768 -96 768 -112 WIRE 880 -96 880 -112 WIRE 0 -80 0 -112 WIRE -112 0 -112 -16 WIRE 576 0 576 -16 WIRE 768 0 768 -32 WIRE 880 0 880 -16 WIRE 192 32 192 -112 WIRE -144 96 -160 96 WIRE 0 96 0 0 WIRE 0 96 -64 96 WIRE 32 96 0 96 WIRE 384 96 352 96 WIRE 528 96 528 -16 WIRE 528 96 464 96 WIRE -96 176 -160 176 WIRE 32 176 -16 176 WIRE 368 176 352 176 WIRE 464 176 448 176 WIRE 528 176 528 96 WIRE -144 256 -160 256 WIRE -48 256 -64 256 WIRE 32 256 16 256 WIRE 480 256 352 256 WIRE -96 336 -160 336 WIRE 32 336 -32 336 WIRE 528 336 528 272 WIRE 528 336 352 336 WIRE 528 352 528 336 WIRE 128 416 128 400 WIRE 256 416 256 400 WIRE 528 448 528 432 WIRE 256 496 256 480 FLAG -160 336 0 FLAG -160 256 0 FLAG -160 176 0 FLAG -112 0 0 FLAG 256 496 0 FLAG 464 176 0 FLAG 768 0 0 FLAG 576 0 0 FLAG 880 0 0 FLAG -112 -112 IN FLAG 880 -112 OUT FLAG -160 96 0 FLAG 128 416 0 FLAG 528 448 0 SYMBOL res 0 160 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R1 SYMATTR Value 56.2K SYMBOL voltage -112 -112 R0 SYMATTR InstName V1 SYMATTR Value 48 SYMBOL cap 16 240 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C1 SYMATTR Value 4700p SYMBOL cap 240 480 M180 WINDOW 0 24 64 Left 2 WINDOW 3 24 8 Left 2 SYMATTR InstName C2 SYMATTR Value 4.7µ SYMBOL res 480 80 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R2 SYMATTR Value 243K SYMBOL res 464 160 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R3 SYMATTR Value 6.04K SYMBOL ind2 512 -112 R0 WINDOW 0 0 40 Right 2 WINDOW 3 0 72 Right 2 SYMATTR InstName L1 SYMATTR Value 60.8µ SYMATTR Type ind SYMATTR SpiceLine Rpar=5K SYMBOL ind2 592 0 R180 WINDOW 0 3 79 Right 2 WINDOW 3 1 44 Right 2 SYMATTR InstName L2 SYMATTR Value 3.8µ SYMATTR Type ind SYMATTR SpiceLine Rpar=5K SYMBOL cap 752 -96 R0 SYMATTR InstName C3 SYMATTR Value 100µ SYMBOL schottky 656 -96 R270 WINDOW 0 32 32 VTop 2 WINDOW 3 0 32 VBottom 2 SYMATTR InstName D1 SYMATTR Value 30BQ060 SYMATTR Description Diode SYMATTR Type diode SYMBOL res -48 240 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R4 SYMATTR Value 10K SYMBOL cap -96 320 M90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C4 SYMATTR Value .002µ SYMBOL res -16 -96 R0 SYMATTR InstName R5 SYMATTR Value 412K SYMBOL res -48 80 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R6 SYMATTR Value 15.4K SYMBOL PowerProducts\\LT3748 192 208 R0 SYMATTR InstName U1 SYMBOL nmos 480 176 R0 SYMATTR InstName Q1 SYMATTR Value Si4490DY SYMBOL res 512 336 R0 SYMATTR InstName R7 SYMATTR Value 33m SYMBOL res 864 -112 R0 SYMATTR InstName Rload SYMATTR Value 6 TEXT 552 -112 Bottom 2 !K1 L1 L2 1. TEXT 672 424 Left 2 !.tran 2.5m startup