Version 4
SHEET 1 1164 1084
WIRE -432 0 -512 0
WIRE 320 0 -432 0
WIRE 384 0 320 0
WIRE -512 16 -512 0
WIRE 480 16 400 16
WIRE 672 16 528 16
WIRE 784 16 736 16
WIRE 800 16 784 16
WIRE 896 16 880 16
WIRE 928 16 896 16
WIRE 1024 16 928 16
WIRE 320 32 320 0
WIRE 480 32 480 16
WIRE 528 32 528 16
WIRE 928 32 928 16
WIRE 1024 32 1024 16
WIRE 240 48 240 32
WIRE 32 64 32 48
WIRE -96 80 -240 80
WIRE -240 96 -240 80
WIRE -512 112 -512 96
WIRE 320 112 320 96
WIRE -432 128 -432 0
WIRE 384 128 384 0
WIRE 480 128 480 112
WIRE 480 128 384 128
WIRE 528 128 528 112
WIRE 624 128 528 128
WIRE 928 128 928 96
WIRE 1024 128 1024 112
WIRE 240 144 240 112
WIRE 240 144 208 144
WIRE 480 144 480 128
WIRE 528 144 528 128
WIRE -96 160 -96 80
WIRE 32 160 32 128
WIRE -240 192 -240 176
WIRE -432 224 -432 208
WIRE -176 224 -432 224
WIRE 128 224 112 224
WIRE 208 224 208 144
WIRE 208 224 192 224
WIRE 240 224 240 208
WIRE 480 224 240 224
WIRE 672 224 528 224
WIRE 784 224 784 16
WIRE 784 224 736 224
WIRE -432 240 -432 224
WIRE 240 240 240 224
WIRE 400 304 400 16
WIRE 400 304 304 304
WIRE -272 320 -288 320
WIRE -176 320 -192 320
WIRE 192 320 112 320
WIRE 304 320 304 304
WIRE -432 336 -432 320
WIRE 144 416 112 416
WIRE 304 416 304 384
WIRE 304 416 208 416
WIRE 400 432 400 304
WIRE -272 512 -288 512
WIRE -176 512 -208 512
WIRE 352 512 112 512
WIRE -272 608 -288 608
WIRE -176 608 -192 608
WIRE 240 608 240 336
WIRE 240 608 112 608
WIRE 400 608 400 528
WIRE 400 608 240 608
WIRE 400 624 400 608
WIRE 896 688 896 16
WIRE -272 704 -288 704
WIRE -176 704 -192 704
WIRE 160 704 112 704
WIRE 400 720 400 704
WIRE -272 800 -288 800
WIRE -176 800 -192 800
WIRE 896 800 896 768
WIRE 896 800 112 800
WIRE 896 816 896 800
WIRE -272 896 -288 896
WIRE -176 896 -208 896
WIRE 896 912 896 896
WIRE 32 976 32 960
WIRE -96 992 -96 960
WIRE 32 1056 32 1040
FLAG 320 112 0
FLAG -512 112 0
FLAG 32 48 0
FLAG -432 336 0
FLAG -288 512 0
FLAG -288 608 0
FLAG -288 704 0
FLAG -288 800 0
FLAG -288 896 0
FLAG -96 992 0
FLAG 32 1056 0
FLAG 400 720 0
FLAG 160 704 0
FLAG 928 128 0
FLAG 896 912 0
FLAG 624 128 0
FLAG 1024 128 0
FLAG 1024 16 OUT
FLAG -512 0 IN
FLAG 304 480 0
FLAG 240 32 0
FLAG -288 320 0
FLAG -240 192 0
SYMBOL voltage -512 0 R0
SYMATTR InstName V1
SYMATTR Value 48
SYMBOL cap 304 32 R0
SYMATTR InstName C1
SYMATTR Value 39µ
SYMATTR SpiceLine V=63
SYMBOL PowerProducts\\LT1683 -32 560 R0
SYMATTR InstName U1
SYMBOL zener 16 64 R0
WINDOW 3 19 67 Left 2
SYMATTR Value BZX84C8V2L
SYMATTR InstName D1
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL res -448 224 R0
SYMATTR InstName R1
SYMATTR Value 976
SYMBOL res -448 112 R0
SYMATTR InstName R2
SYMATTR Value 23.2K
SYMBOL cap -208 496 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C3
SYMATTR Value 1.3n
SYMBOL res -176 592 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 16.9K
SYMBOL res -176 688 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R4
SYMATTR Value 7K
SYMBOL cap -208 880 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C4
SYMATTR Value 5n
SYMBOL cap 16 976 R0
WINDOW 3 44 31 Left 2
WINDOW 39 27 57 Left 2
SYMATTR Value .22µ
SYMATTR SpiceLine Rser=15K Cpar=22n
SYMATTR InstName C5
SYMBOL nmos 192 240 R0
WINDOW 3 -59 100 Left 2
WINDOW 0 56 26 Left 2
SYMATTR Value Si7802DN
SYMATTR InstName Q1
SYMBOL cap 192 208 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C6
SYMATTR Value 5p
SYMBOL ind2 464 128 M180
WINDOW 0 1 69 Right 2
WINDOW 3 3 44 Right 2
SYMATTR InstName L1
SYMATTR Value 1m
SYMATTR Type ind
SYMATTR SpiceLine Rser=.6
SYMBOL ind2 464 240 M180
WINDOW 0 0 80 Right 2
WINDOW 3 -2 48 Right 2
SYMATTR InstName L2
SYMATTR Value 1m
SYMATTR Type ind
SYMATTR SpiceLine Rser=.6
SYMBOL nmos 352 432 R0
WINDOW 0 58 31 Left 2
WINDOW 3 61 101 Left 2
SYMATTR InstName Q2
SYMATTR Value Si7802DN
SYMBOL cap 208 400 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C7
SYMATTR Value 5p
SYMBOL res 384 608 R0
SYMATTR InstName R5
SYMATTR Value 50m
SYMBOL schottky 672 32 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D2
SYMATTR Value MBR20100CT
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL cap 912 32 R0
SYMATTR Value 150µ
SYMATTR InstName C8
SYMATTR SpiceLine Rser=20m
SYMBOL res 880 800 R0
SYMATTR InstName R6
SYMATTR Value 2.5K
SYMBOL res 880 672 R0
SYMATTR InstName R7
SYMATTR Value 7.5K
SYMBOL ind2 544 128 R180
WINDOW 0 2 68 Right 2
WINDOW 3 2 35 Right 2
SYMATTR InstName L3
SYMATTR Value 423µ
SYMATTR SpiceLine Rser=.5
SYMATTR Type ind
SYMBOL ind2 544 240 R180
WINDOW 0 -4 76 Right 2
WINDOW 3 -3 47 Right 2
SYMATTR InstName L4
SYMATTR Value 423µ
SYMATTR SpiceLine Rser=.5
SYMATTR Type ind
SYMBOL cap 288 320 R0
SYMATTR InstName C9
SYMATTR Value 10p
SYMBOL cap 288 416 R0
WINDOW 3 27 57 Left 2
SYMATTR Value 30p
SYMATTR InstName C10
SYMBOL cap 224 208 M180
WINDOW 0 24 64 Left 2
WINDOW 3 24 8 Left 2
SYMATTR InstName C11
SYMATTR Value 10p
SYMBOL cap 224 112 M180
WINDOW 0 24 64 Left 2
WINDOW 3 24 8 Left 2
SYMATTR InstName C12
SYMATTR Value 30p
SYMBOL res -176 304 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R8
SYMATTR Value 500
SYMBOL voltage -240 80 R0
SYMATTR InstName V2
SYMATTR Value 10
SYMBOL res -176 784 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R9
SYMATTR Value 7K
SYMBOL schottky 672 240 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D3
SYMATTR Value MBR20100CT
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL res 1008 16 R0
SYMATTR InstName Rload
SYMATTR Value 2.5
SYMBOL ind2 784 32 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName L5
SYMATTR Value 22µ
SYMATTR Type ind
TEXT 520 864 Left 2 !.tran 2.5m startup
TEXT 512 0 Bottom 2 !K1 L1 L2 L3 L4 1
RECTANGLE Normal 608 240 416 0 3