* SPICE netlist
XU1 N007 N007 N005 N013 N015 N004 N003 IN N008 N006 N016 N009 N011 N002 N012 N010 0 LT3755 ;pnba Vref)PWMin)_OPENLED)SS)Rt)_SHDN/UVLO)INTVcc)Vin)Sense)Gate)PWMout)FB)ISN)ISP)Vc)CTRL)GND
C1 N003 0 4.7
MQ1 N001 N006 N008 N008 Si7850DP
R1 N008 0 10m
L1 IN N001 22 Rpar=2K
R2 N002 N009 1Meg
R3 N009 0 23.7K
D1 N001 N002 MBRS360
R4 N002 N011 .1
C2 N002 0 4.7
V1 IN 0 10
R5 IN N004 1Meg
R6 N004 0 185K
C3 N012 0 1000p Rser=10K
MQ2 N014 N016 0 0 Si7850DP
D2 N011 N014 LXK2-PW14 N=10
C4 N013 0 .001
R7 N015 0 28.7K
R8 N003 N005 100K
R9 IN N010 332K
R10 N010 0 40.2K
.tran 2m startup

* LTspice schematic (.asc)
Version 4
SHEET 1 1344 640
WIRE -560 -320 -672 -320
WIRE -464 -320 -560 -320
WIRE -32 -320 -464 -320
WIRE 192 -320 -32 -320
WIRE 304 -320 272 -320
WIRE 352 -320 304 -320
WIRE 448 -320 416 -320
WIRE 544 -320 448 -320
WIRE 672 -320 544 -320
WIRE -672 -304 -672 -320
WIRE -464 -304 -464 -320
WIRE 544 -304 544 -320
WIRE 160 -288 -336 -288
WIRE -32 -272 -32 -320
WIRE 304 -224 304 -320
WIRE 544 -224 544 -240
WIRE -672 -208 -672 -224
WIRE -464 -208 -464 -224
WIRE -208 -208 -464 -208
WIRE 160 -208 160 -288
WIRE 160 -208 144 -208
WIRE 240 -208 224 -208
WIRE -464 -192 -464 -208
WIRE -336 -144 -336 -288
WIRE -320 -144 -336 -144
WIRE -208 -144 -240 -144
WIRE 256 -144 144 -144
WIRE 448 -144 448 -320
WIRE -560 -112 -560 -320
WIRE 672 -112 672 -320
WIRE 672 -112 576 -112
WIRE -464 -96 -464 -112
WIRE 672 -96 672 -112
WIRE -208 -80 -224 -80
WIRE 304 -80 304 -128
WIRE 304 -80 144 -80
WIRE 304 -64 304 -80
WIRE 448 -48 448 -64
WIRE 448 -48 400 -48
WIRE 448 -32 448 -48
WIRE -560 -16 -560 -32
WIRE -208 -16 -560 -16
WIRE -560 0 -560 -16
WIRE 672 0 672 -16
WIRE 672 0 608 0
WIRE 672 32 672 0
WIRE -432 48 -448 48
WIRE -208 48 -368 48
WIRE 400 48 400 -48
WIRE 400 48 144 48
WIRE 448 64 448 48
WIRE -560 96 -560 80
WIRE -304 112 -320 112
WIRE -208 112 -240 112
WIRE 576 112 576 -112
WIRE 576 112 144 112
WIRE 672 160 672 96
WIRE -384 176 -448 176
WIRE -208 176 -304 176
WIRE 608 176 608 0
WIRE 608 176 144 176
WIRE -224 240 -224 -80
WIRE -208 240 -224 240
WIRE 624 240 144 240
WIRE 672 272 672 256
WIRE -32 320 -32 304
FLAG 240 -208 0
FLAG 304 16 0
FLAG 448 64 0
FLAG 544 -224 0
FLAG -672 -208 0
FLAG -464 -96 0
FLAG -448 48 0
FLAG 672 272 0
FLAG -320 112 0
FLAG -448 176 0
FLAG -32 320 0
FLAG -672 -320 IN
FLAG -560 96 0
SYMBOL PowerProducts\\LT3755 -32 16 R0
SYMATTR InstName U1
SYMBOL cap 160 -192 R270
SYMATTR InstName C1
SYMATTR Value 4.7
SYMBOL nmos 256 -224 R0
SYMATTR InstName Q1
SYMATTR Value Si7850DP
SYMBOL res 288 -80 R0
SYMATTR InstName R1
SYMATTR Value 10m
SYMBOL ind 176 -304 R270
SYMATTR InstName L1
SYMATTR Value 22
SYMATTR SpiceLine Rpar=2K
SYMBOL res 432 -160 R0
SYMATTR InstName R2
SYMATTR Value 1Meg
SYMBOL res 432 -48 R0
SYMATTR InstName R3
SYMATTR Value 23.7K
SYMBOL schottky 352 -304 R270
SYMATTR InstName D1
SYMATTR Value MBRS360
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL res 656 -112 R0
SYMATTR InstName R4
SYMATTR Value .1
SYMBOL cap 528 -304 R0
SYMATTR InstName C2
SYMATTR Value 4.7
SYMBOL voltage -672 -320 R0
SYMATTR InstName V1
SYMATTR Value 10
SYMBOL res -480 -320 R0
SYMATTR InstName R5
SYMATTR Value 1Meg
SYMBOL res -480 -208 R0
SYMATTR InstName R6
SYMATTR Value 185K
SYMBOL cap -368 32 R90
SYMATTR InstName C3
SYMATTR Value 1000p
SYMATTR SpiceLine Rser=10K
SYMBOL nmos 624 160 R0
SYMATTR InstName Q2
SYMATTR Value Si7850DP
SYMBOL LED 656 32 R0
SYMATTR Value LXK2-PW14
SYMATTR Value2 N=10
SYMATTR InstName D2
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL cap -240 96 R90
SYMATTR InstName C4
SYMATTR Value .001
SYMBOL res -288 160 R90
SYMATTR InstName R7
SYMATTR Value 28.7K
SYMBOL res -336 -128 R270
SYMATTR InstName R8
SYMATTR Value 100K
SYMBOL res -576 -128 R0
SYMATTR InstName R9
SYMATTR Value 332K
SYMBOL res -576 -16 R0
SYMATTR InstName R10
SYMATTR Value 40.2K