* SPICE netlist
XU1 N005 0 N008 N006 N002 N004 LTC3803 ;pnba Ith/Run)GND)FB)Sense)Vcc)Ngate
V1 IN 0 13
R1 IN N002 399
C1 N002 0 4.7
R2 N008 0 1000
MQ1 N003 N004 N007 N007 FDS6680A
R3 N007 0 0.2
R4 N007 N006 5.1K
D1 N001 OUT MBRS1100
L1 0 N001 200 Rser=0.344
L2 IN N003 200 Rser=0.344
C2 OUT 0 100 Rser=0.1
XU2 N015 0 N014 0 N016 MOC205 Igain=2.44m ;pnba A)K)C)E)B
R5 OUT N010 73.2K
R6 N010 0 10K
R7 N016 0 475K
R8 N009 N015 3K
C3 N011 0 .05
R9 N010 N013 200K
C4 N013 N012 .001
D2 N005 N014 1N4148
R10 N014 N017 4.99K
XU3 OUT 0 N011 N010 N012 N009 LT4430 ;pnba Vin)GND)OC)FB)Comp)OPTO
V2 N017 0 5
C5 N007 0 .1
Rload OUT 0 100
K1 L1 L2 1
.tran 7m startup

* LTspice schematic (.asc)
Version 4
SHEET 1 1472 720
WIRE -464 -360 -736 -360
WIRE -96 -360 -464 -360
WIRE 96 -360 -32 -360
WIRE 320 -360 160 -360
WIRE 560 -360 320 -360
WIRE 656 -360 560 -360
WIRE 736 -360 656 -360
WIRE -736 -344 -736 -360
WIRE -464 -344 -464 -360
WIRE -96 -344 -96 -360
WIRE -32 -344 -32 -360
WIRE 560 -344 560 -360
WIRE 736 -344 736 -360
WIRE -736 -248 -736 -264
WIRE -464 -248 -464 -264
WIRE -464 -248 -672 -248
WIRE -96 -248 -96 -264
WIRE -32 -248 -32 -264
WIRE 560 -248 560 -280
WIRE 736 -248 736 -264
WIRE -672 -232 -672 -248
WIRE -464 -216 -464 -248
WIRE 656 -216 656 -360
WIRE -144 -168 -336 -168
WIRE -672 -152 -672 -168
WIRE -592 -104 -656 -104
WIRE -320 -104 -336 -104
WIRE -176 -104 -240 -104
WIRE -96 -104 -96 -152
WIRE -96 -104 -176 -104
WIRE -176 -88 -176 -104
WIRE -96 -88 -96 -104
WIRE 320 -56 320 -360
WIRE -288 -40 -336 -40
WIRE -656 -24 -656 -104
WIRE -288 -24 -288 -40
WIRE -176 8 -176 -24
WIRE -96 8 -96 -8
WIRE 192 8 16 8
WIRE 656 8 656 -136
WIRE 656 8 448 8
WIRE -464 24 -464 8
WIRE 16 40 16 8
WIRE -288 72 -288 56
WIRE 112 120 96 120
WIRE 192 120 176 120
WIRE 464 120 448 120
WIRE 544 120 528 120
WIRE 656 120 656 8
WIRE 656 120 624 120
WIRE 656 136 656 120
WIRE -656 152 -656 40
WIRE -336 152 -656 152
WIRE 16 152 16 120
WIRE 16 152 -144 152
WIRE -656 168 -656 152
WIRE 320 200 320 184
WIRE -336 216 -352 216
WIRE -432 248 -448 248
WIRE -336 248 -352 248
WIRE -112 248 -144 248
WIRE -656 264 -656 248
WIRE -656 360 -656 344
FLAG -464 24 0
FLAG -448 248 0
FLAG -736 -248 0
FLAG 736 -248 0
FLAG 560 -248 0
FLAG -32 -248 0
FLAG 320 200 0
FLAG 656 216 0
FLAG 96 120 0
FLAG -112 248 0
FLAG -96 8 0
FLAG -176 8 0
FLAG -288 72 0
FLAG -672 -152 0
FLAG -352 216 0
FLAG -656 360 0
FLAG 736 -360 OUT
FLAG -736 -360 IN
SYMBOL PowerProducts\\LTC3803 -464 -104 R0
SYMATTR InstName U1
SYMBOL voltage -736 -360 R0
SYMATTR Value 13
SYMATTR InstName V1
SYMBOL res -480 -360 R0
SYMATTR InstName R1
SYMATTR Value 399
SYMBOL cap -688 -232 R0
SYMATTR InstName C1
SYMATTR Value 4.7
SYMBOL res -272 -40 M0
SYMATTR InstName R2
SYMATTR Value 1000
SYMBOL nmos -144 -248 R0
SYMATTR InstName Q1
SYMATTR Value FDS6680A
SYMBOL res -112 -104 R0
SYMATTR InstName R3
SYMATTR Value 0.2
SYMBOL res -224 -120 R90
SYMATTR InstName R4
SYMATTR Value 5.1K
SYMBOL schottky 96 -344 R270
SYMATTR InstName D1
SYMATTR Value MBRS1100
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL ind2 -16 -248 R180
SYMATTR InstName L1
SYMATTR Value 200
SYMATTR Type ind
SYMATTR SpiceLine Rser=0.344
SYMBOL ind2 -112 -360 R0
SYMATTR InstName L2
SYMATTR Value 200
SYMATTR Type ind
SYMATTR SpiceLine Rser=0.344
SYMBOL polcap 544 -344 R0
SYMATTR Value 100
SYMATTR InstName C2
SYMATTR Description Capacitor
SYMATTR Type cap
SYMATTR SpiceLine Rser=0.1
SYMBOL Optos\\MOC207 -240 216 M0
SYMATTR InstName U2
SYMBOL res 640 -232 R0
SYMATTR InstName R5
SYMATTR Value 73.2K
SYMBOL res 640 120 R0
SYMATTR InstName R6
SYMATTR Value 10K
SYMBOL res -336 232 R90
SYMATTR InstName R7
SYMATTR Value 475K
SYMBOL res 0 24 R0
SYMATTR InstName R8
SYMATTR Value 3K
SYMBOL cap 176 104 R90
SYMATTR InstName C3
SYMATTR Value .05
SYMBOL res 640 104 R90
SYMATTR InstName R9
SYMATTR Value 200K
SYMBOL cap 528 104 R90
SYMATTR InstName C4
SYMATTR Value .001
SYMBOL diode -672 -24 R0
SYMATTR InstName D2
SYMATTR Value 1N4148
SYMBOL res -672 152 R0
SYMATTR InstName R10
SYMATTR Value 4.99K
SYMBOL PowerProducts\\LT4430 320 56 R0
SYMATTR InstName U3
SYMBOL voltage -656 248 R0
SYMATTR Value 5
SYMATTR InstName V2
SYMBOL cap -192 -88 R0
SYMATTR InstName C5
SYMATTR Value .1
SYMBOL res 720 -360 R0
SYMATTR InstName Rload
SYMATTR Value 100