Version 4
SHEET 1 1864 680
WIRE 16 128 -32 128
WIRE 208 128 16 128
WIRE 336 128 208 128
WIRE 480 128 336 128
WIRE 208 144 208 128
WIRE 480 144 480 128
WIRE 704 144 624 144
WIRE 816 144 768 144
WIRE 928 144 816 144
WIRE 976 144 928 144
WIRE 336 176 336 128
WIRE 816 192 816 144
WIRE 976 192 976 144
WIRE -32 224 -32 128
WIRE 672 224 624 224
WIRE 208 240 208 208
WIRE 336 272 336 256
WIRE 384 272 336 272
WIRE 480 272 480 224
WIRE 480 272 448 272
WIRE 208 320 208 304
WIRE 480 320 480 272
WIRE 480 320 208 320
WIRE -32 336 -32 304
WIRE 672 336 672 224
WIRE 816 336 816 256
WIRE 976 336 976 272
WIRE 480 368 480 320
WIRE 432 448 304 448
WIRE 480 480 480 464
WIRE 304 496 304 448
WIRE 304 608 304 576
FLAG -32 336 0
FLAG 816 336 0
FLAG 976 336 0
FLAG 928 144 OUT
FLAG 16 128 IN
FLAG 304 608 0
FLAG 480 480 0
FLAG 672 336 0
SYMBOL voltage -32 208 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value {Vin}
SYMBOL cap 800 192 R0
SYMATTR InstName C1
SYMATTR Value 47µ
SYMATTR SpiceLine Rser=0.022
SYMBOL res 960 176 R0
SYMATTR InstName R1
SYMATTR Value 5
SYMBOL voltage 304 480 R0
WINDOW 0 -61 16 Left 2
WINDOW 3 -154 160 Left 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value PULSE(0 15 0 1n 1n {D} {1/F})
SYMBOL schottky 704 160 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D1
SYMATTR Value B530C
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL ind2 464 128 R0
SYMATTR InstName L1
SYMATTR Value {L1}
SYMATTR Type ind
SYMBOL ind2 640 240 R180
WINDOW 0 36 80 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName L2
SYMATTR Value {L2}
SYMATTR Type ind
SYMBOL nmos 432 368 R0
SYMATTR InstName M1
SYMATTR Value SUM75N06-09L
SYMBOL res 320 160 R0
SYMATTR InstName R2
SYMATTR Value 39
SYMBOL cap 448 256 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C2
SYMATTR Value 470p
SYMBOL schottky 224 304 R180
WINDOW 0 24 64 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D2
SYMATTR Value MBR0540
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL zener 192 144 R0
SYMATTR InstName D3
SYMATTR Value TFZ39B
TEXT 496 -168 Left 2 !.tran 0 1m 0 10n
TEXT 488 -8 Left 2 !.PARAM F = 300k
TEXT 488 24 Left 2 !.PARAM D = (Vout * N12) / (Vout * N12 + Vin) * (1/F)
TEXT 488 -64 Left 2 !.PARAM Vin = 12V
TEXT 488 -40 Left 2 !.PARAM Vout = 5V
TEXT 488 104 Left 2 !K1 L1 L2 0.995
TEXT 112 -80 Left 2 !.PARAM N21 = 1
TEXT 112 16 Left 2 !.PARAM L2 = pow(N21,2) * L1
TEXT 112 -16 Left 2 !.PARAM L1 = 20u
TEXT 1112 96 Left 2 ;Lleak = L1 * (1-K^2)
TEXT 488 72 Left 2 !;K1 L1 L2 1
TEXT 1112 128 Left 2 ;Lleak 200nH
TEXT 112 -48 Left 2 !.PARAM N12 = 1 / N21