* SPICE netlist
V1 IN 0 48
C1 IN 0 39 V=63
XU1 N012 N008 N006 N018 N011 MP_01 N015 N017 N021 NC_02 0 N023 N022 N007 N020 N019 N004 N013 N016 0 LT1683 ;pnba GateA)CapA)GCL)CS)V5))Ct)Rt)FB)NFB)GND)Vc)SS)_SHDN)RCSL)RVSL)Vin)CapB)GateB)PGND
D1 0 N006 BZX84C8V2L
R1 N007 0 976
R2 IN N007 23.2K
C3 N015 0 1.3n
R3 N017 0 16.9K
R4 N019 0 7K
C4 N022 0 5n
C5 N023 0 .22 Rser=15K Cpar=22n
MQ1 N009 N012 N018 N018 Si7802DN
C6 N005 N008 5p
L1 IN N001 1m Rser=.6
L2 N009 IN 1m Rser=.6
MQ2 N001 N016 N018 N018 Si7802DN
C7 N014 N013 5p
R5 N018 0 50m
D2 N002 N003 MBR20100CT
C8 OUT 0 150 Rser=20m
R6 N021 0 2.5K
R7 OUT N021 7.5K
L3 0 N002 423 Rser=.5
L4 N010 0 423 Rser=.5
C9 N001 N014 10p
C10 N014 0 30p
C11 N009 N005 10p
C12 N005 0 30p
R8 N011 0 500
V2 N004 0 10
R9 N020 0 7K
D3 N010 N003 MBR20100CT
Rload OUT 0 2.5
L5 N003 OUT 22
.tran 2.5m startup
K1 L1 L2 L3 L4 1

* LTspice schematic (.asc)
Version 4
SHEET 1 1536 1056
WIRE -688 -528 -768 -528
WIRE 64 -528 -688 -528
WIRE 128 -528 64 -528
WIRE -768 -512 -768 -528
WIRE 224 -512 144 -512
WIRE 416 -512 272 -512
WIRE 528 -512 480 -512
WIRE 544 -512 528 -512
WIRE 640 -512 624 -512
WIRE 672 -512 640 -512
WIRE 768 -512 672 -512
WIRE 64 -496 64 -528
WIRE 224 -496 224 -512
WIRE 272 -496 272 -512
WIRE 672 -496 672 -512
WIRE 768 -496 768 -512
WIRE -16 -480 -16 -496
WIRE -224 -464 -224 -480
WIRE -352 -448 -496 -448
WIRE -496 -432 -496 -448
WIRE -768 -416 -768 -432
WIRE 64 -416 64 -432
WIRE -688 -400 -688 -528
WIRE 128 -400 128 -528
WIRE 224 -400 224 -416
WIRE 224 -400 128 -400
WIRE 272 -400 272 -416
WIRE 368 -400 272 -400
WIRE 672 -400 672 -432
WIRE 768 -400 768 -416
WIRE -16 -384 -16 -416
WIRE -16 -384 -48 -384
WIRE 224 -384 224 -400
WIRE 272 -384 272 -400
WIRE -352 -368 -352 -448
WIRE -224 -368 -224 -400
WIRE -496 -336 -496 -352
WIRE -688 -304 -688 -320
WIRE -432 -304 -688 -304
WIRE -128 -304 -144 -304
WIRE -48 -304 -48 -384
WIRE -48 -304 -64 -304
WIRE -16 -304 -16 -320
WIRE 224 -304 -16 -304
WIRE 416 -304 272 -304
WIRE 528 -304 528 -512
WIRE 528 -304 480 -304
WIRE -688 -288 -688 -304
WIRE -16 -288 -16 -304
WIRE 144 -224 144 -512
WIRE 144 -224 48 -224
WIRE -528 -208 -544 -208
WIRE -432 -208 -448 -208
WIRE -64 -208 -144 -208
WIRE 48 -208 48 -224
WIRE -688 -192 -688 -208
WIRE -112 -112 -144 -112
WIRE 48 -112 48 -144
WIRE 48 -112 -48 -112
WIRE 144 -96 144 -224
WIRE -528 -16 -544 -16
WIRE -432 -16 -464 -16
WIRE 96 -16 -144 -16
WIRE -528 80 -544 80
WIRE -432 80 -448 80
WIRE -16 80 -16 -192
WIRE -16 80 -144 80
WIRE 144 80 144 0
WIRE 144 80 -16 80
WIRE 144 96 144 80
WIRE 640 160 640 -512
WIRE -528 176 -544 176
WIRE -432 176 -448 176
WIRE -96 176 -144 176
WIRE 144 192 144 176
WIRE -528 272 -544 272
WIRE -432 272 -448 272
WIRE 640 272 640 240
WIRE 640 272 -144 272
WIRE 640 288 640 272
WIRE -528 368 -544 368
WIRE -432 368 -464 368
WIRE 640 384 640 368
WIRE -224 448 -224 432
WIRE -352 464 -352 432
WIRE -224 528 -224 512
FLAG 64 -416 0
FLAG -768 -416 0
FLAG -224 -480 0
FLAG -688 -192 0
FLAG -544 -16 0
FLAG -544 80 0
FLAG -544 176 0
FLAG -544 272 0
FLAG -544 368 0
FLAG -352 464 0
FLAG -224 528 0
FLAG 144 192 0
FLAG -96 176 0
FLAG 672 -400 0
FLAG 640 384 0
FLAG 368 -400 0
FLAG 768 -400 0
FLAG 768 -512 OUT
FLAG -768 -528 IN
FLAG 48 -48 0
FLAG -16 -496 0
FLAG -544 -208 0
FLAG -496 -336 0
SYMBOL voltage -768 -528 R0
SYMATTR InstName V1
SYMATTR Value 48
SYMBOL cap 48 -496 R0
SYMATTR InstName C1
SYMATTR Value 39
SYMATTR SpiceLine V=63
SYMBOL PowerProducts\\LT1683 -288 32 R0
SYMATTR InstName U1
SYMBOL zener -240 -464 R0
SYMATTR Value BZX84C8V2L
SYMATTR InstName D1
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL res -704 -304 R0
SYMATTR InstName R1
SYMATTR Value 976
SYMBOL res -704 -416 R0
SYMATTR InstName R2
SYMATTR Value 23.2K
SYMBOL cap -464 -32 R90
SYMATTR InstName C3
SYMATTR Value 1.3n
SYMBOL res -432 64 R90
SYMATTR InstName R3
SYMATTR Value 16.9K
SYMBOL res -432 160 R90
SYMATTR InstName R4
SYMATTR Value 7K
SYMBOL cap -464 352 R90
SYMATTR InstName C4
SYMATTR Value 5n
SYMBOL cap -240 448 R0
SYMATTR Value .22
SYMATTR SpiceLine Rser=15K Cpar=22n
SYMATTR InstName C5
SYMBOL nmos -64 -288 R0
SYMATTR Value Si7802DN
SYMATTR InstName Q1
SYMBOL cap -64 -320 R90
SYMATTR InstName C6
SYMATTR Value 5p
SYMBOL ind2 208 -400 M180
SYMATTR InstName L1
SYMATTR Value 1m
SYMATTR Type ind
SYMATTR SpiceLine Rser=.6
SYMBOL ind2 208 -288 M180
SYMATTR InstName L2
SYMATTR Value 1m
SYMATTR Type ind
SYMATTR SpiceLine Rser=.6
SYMBOL nmos 96 -96 R0
SYMATTR InstName Q2
SYMATTR Value Si7802DN
SYMBOL cap -48 -128 R90
SYMATTR InstName C7
SYMATTR Value 5p
SYMBOL res 128 80 R0
SYMATTR InstName R5
SYMATTR Value 50m
SYMBOL schottky 416 -496 R270
SYMATTR InstName D2
SYMATTR Value MBR20100CT
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL cap 656 -496 R0
SYMATTR Value 150
SYMATTR InstName C8
SYMATTR SpiceLine Rser=20m
SYMBOL res 624 272 R0
SYMATTR InstName R6
SYMATTR Value 2.5K
SYMBOL res 624 144 R0
SYMATTR InstName R7
SYMATTR Value 7.5K
SYMBOL ind2 288 -400 R180
SYMATTR InstName L3
SYMATTR Value 423
SYMATTR SpiceLine Rser=.5
SYMATTR Type ind
SYMBOL ind2 288 -288 R180
SYMATTR InstName L4
SYMATTR Value 423
SYMATTR SpiceLine Rser=.5
SYMATTR Type ind
SYMBOL cap 32 -208 R0
SYMATTR InstName C9
SYMATTR Value 10p
SYMBOL cap 32 -112 R0
SYMATTR Value 30p
SYMATTR InstName C10
SYMBOL cap -32 -320 M180
SYMATTR InstName C11
SYMATTR Value 10p
SYMBOL cap -32 -416 M180
SYMATTR InstName C12
SYMATTR Value 30p
SYMBOL res -432 -224 R90
SYMATTR InstName R8
SYMATTR Value 500
SYMBOL voltage -496 -448 R0
SYMATTR InstName V2
SYMATTR Value 10
SYMBOL res -432 256 R90
SYMATTR InstName R9
SYMATTR Value 7K
SYMBOL schottky 416 -288 R270
SYMATTR InstName D3
SYMATTR Value MBR20100CT
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL res 752 -512 R0
SYMATTR InstName Rload
SYMATTR Value 2.5
SYMBOL ind2 528 -496 R270
SYMATTR InstName L5
SYMATTR Value 22
SYMATTR Type ind