* SPICE netlist
C1 N004 0 4.7
MQ1 N001 N006 N008 N008 Si4850EY
R1 N008 0 10m
L1 IN N001 22 Rpar=2K
R2 N002 N009 2Meg
R3 N009 0 57K
D1 N001 N002 MBRS360
R4 N002 N010 .1
C2 N002 0 5
V1 IN 0 10
R5 IN N003 1Meg
R6 N003 0 200K
C3 N011 0 1000p Rser=10K
MQ2 N013 N016 0 0 Si4850EY
D2 N010 N013 LXK2-PW14 N=10
C4 N012 0 .01
R7 N014 0 28.7K
V2 N015 0 3.3
V3 N005 0 PULSE(0 3.3 2m 10n 10n 1.5u 3u)
XU1 N007 N015 N005 N012 N014 N003 N004 IN N008 N006 N016 N009 N010 N002 N011 N007 0 LT3756-1 ;pnba Vref)PWMin)SYNC)SS)Rt)_SHDN/UVLO)INTVcc)Vin)Sense)Gate)PWMout)FB)ISN)ISP)Vc)CTRL)GND
.tran 2.75m startup

* LTspice schematic (.asc)
Version 4
SHEET 1 1344 640
WIRE -416 -320 -544 -320
WIRE -32 -320 -416 -320
WIRE 112 -320 -32 -320
WIRE 304 -320 192 -320
WIRE 352 -320 304 -320
WIRE 448 -320 416 -320
WIRE 544 -320 448 -320
WIRE 672 -320 544 -320
WIRE -544 -304 -544 -320
WIRE -416 -304 -416 -320
WIRE 544 -304 544 -320
WIRE -32 -272 -32 -320
WIRE 304 -224 304 -320
WIRE 544 -224 544 -240
WIRE -544 -208 -544 -224
WIRE -416 -208 -416 -224
WIRE -208 -208 -416 -208
WIRE 160 -208 144 -208
WIRE 240 -208 224 -208
WIRE -416 -192 -416 -208
WIRE -208 -144 -288 -144
WIRE 256 -144 144 -144
WIRE 448 -144 448 -320
WIRE 672 -112 672 -320
WIRE 672 -112 576 -112
WIRE -416 -96 -416 -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 -608 -48 -672 -48
WIRE -288 -48 -288 -144
WIRE -288 -48 -528 -48
WIRE 448 -48 448 -64
WIRE 448 -48 400 -48
WIRE 448 -32 448 -48
WIRE -224 -16 -224 -80
WIRE -208 -16 -224 -16
WIRE 672 0 672 -16
WIRE 672 0 608 0
WIRE 672 32 672 0
WIRE -400 48 -416 48
WIRE -208 48 -336 48
WIRE 400 48 400 -48
WIRE 400 48 144 48
WIRE 448 64 448 48
WIRE -288 112 -304 112
WIRE -208 112 -224 112
WIRE 576 112 576 -112
WIRE 576 112 144 112
WIRE 672 160 672 96
WIRE -384 176 -416 176
WIRE -208 176 -304 176
WIRE 608 176 608 0
WIRE 608 176 144 176
WIRE -512 240 -528 240
WIRE -208 240 -432 240
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 -544 -208 0
FLAG -416 -96 0
FLAG -416 48 0
FLAG 672 272 0
FLAG -304 112 0
FLAG -416 176 0
FLAG -32 320 0
FLAG -528 240 0
FLAG -672 -48 0
FLAG -544 -320 IN
SYMBOL cap 160 -192 R270
SYMATTR InstName C1
SYMATTR Value 4.7
SYMBOL nmos 256 -224 R0
SYMATTR InstName Q1
SYMATTR Value Si4850EY
SYMBOL res 288 -80 R0
SYMATTR InstName R1
SYMATTR Value 10m
SYMBOL ind 96 -304 R270
SYMATTR InstName L1
SYMATTR Value 22
SYMATTR SpiceLine Rpar=2K
SYMBOL res 432 -160 R0
SYMATTR InstName R2
SYMATTR Value 2Meg
SYMBOL res 432 -48 R0
SYMATTR InstName R3
SYMATTR Value 57K
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 5
SYMBOL voltage -544 -320 R0
SYMATTR InstName V1
SYMATTR Value 10
SYMBOL res -432 -320 R0
SYMATTR InstName R5
SYMATTR Value 1Meg
SYMBOL res -432 -208 R0
SYMATTR InstName R6
SYMATTR Value 200K
SYMBOL cap -336 32 R90
SYMATTR InstName C3
SYMATTR Value 1000p
SYMATTR SpiceLine Rser=10K
SYMBOL nmos 624 160 R0
SYMATTR InstName Q2
SYMATTR Value Si4850EY
SYMBOL LED 656 32 R0
SYMATTR Value LXK2-PW14
SYMATTR Value2 N=10
SYMATTR InstName D2
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL cap -224 96 R90
SYMATTR InstName C4
SYMATTR Value .01
SYMBOL res -288 160 R90
SYMATTR InstName R7
SYMATTR Value 28.7K
SYMBOL voltage -416 240 R90
SYMATTR InstName V2
SYMATTR Value 3.3
SYMBOL voltage -512 -48 R90
SYMATTR InstName V3
SYMATTR Value PULSE(0 3.3 2m 10n 10n 1.5u 3u)
SYMBOL PowerProducts\\LT3756-1 -32 16 R0
SYMATTR InstName U1