* SPICE netlist
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 N017 0 0 Si7850DP
D2 N011 N014 LXK2-PW14 N=10
C4 N013 0 .001
R7 N015 0 28.7K
V2 N016 0 PULSE(0 5 2m 1u 1u 125u 250u)
R8 N003 N005 100K
R9 IN N010 332K
R10 N010 0 40.2K
XU1 N007 N016 N005 N013 N015 N004 N003 IN N008 N006 N017 N009 N011 N002 N012 N010 0 LT3756 ;pnba Vref)PWMin)_OPENLED)SS)Rt)_SHDN/UVLO)INTVcc)Vin)Sense)Gate)PWMout)FB)ISN)ISP)Vc)CTRL)GND
.tran 3m startup

* LTspice schematic (.asc)
Version 4
SHEET 1 1328 640
WIRE -552 -320 -664 -320
WIRE -456 -320 -552 -320
WIRE -40 -320 -456 -320
WIRE 184 -320 -40 -320
WIRE 296 -320 264 -320
WIRE 344 -320 296 -320
WIRE 440 -320 408 -320
WIRE 536 -320 440 -320
WIRE 664 -320 536 -320
WIRE -664 -304 -664 -320
WIRE -456 -304 -456 -320
WIRE 536 -304 536 -320
WIRE 152 -288 -328 -288
WIRE -40 -272 -40 -320
WIRE 296 -224 296 -320
WIRE 536 -224 536 -240
WIRE -664 -208 -664 -224
WIRE -456 -208 -456 -224
WIRE -216 -208 -456 -208
WIRE 152 -208 152 -288
WIRE 152 -208 136 -208
WIRE 232 -208 216 -208
WIRE -456 -192 -456 -208
WIRE -328 -144 -328 -288
WIRE -312 -144 -328 -144
WIRE -216 -144 -232 -144
WIRE 248 -144 136 -144
WIRE 440 -144 440 -320
WIRE -552 -112 -552 -320
WIRE 664 -112 664 -320
WIRE 664 -112 568 -112
WIRE -456 -96 -456 -112
WIRE 664 -96 664 -112
WIRE -216 -80 -232 -80
WIRE 296 -80 296 -128
WIRE 296 -80 136 -80
WIRE 296 -64 296 -80
WIRE 440 -48 440 -64
WIRE 440 -48 392 -48
WIRE 440 -32 440 -48
WIRE -552 -16 -552 -32
WIRE -216 -16 -552 -16
WIRE -552 0 -552 -16
WIRE 664 0 664 -16
WIRE 664 0 600 0
WIRE 664 32 664 0
WIRE -424 48 -440 48
WIRE -216 48 -360 48
WIRE 392 48 392 -48
WIRE 392 48 136 48
WIRE 440 64 440 48
WIRE -552 96 -552 80
WIRE -296 112 -312 112
WIRE -216 112 -232 112
WIRE 568 112 568 -112
WIRE 568 112 136 112
WIRE 664 160 664 96
WIRE -376 176 -440 176
WIRE -216 176 -296 176
WIRE 600 176 600 0
WIRE 600 176 136 176
WIRE -520 240 -536 240
WIRE -216 240 -440 240
WIRE 616 240 136 240
WIRE 664 272 664 256
WIRE -40 320 -40 304
FLAG 232 -208 0
FLAG 296 16 0
FLAG 440 64 0
FLAG 536 -224 0
FLAG -664 -208 0
FLAG -456 -96 0
FLAG -440 48 0
FLAG 664 272 0
FLAG -312 112 0
FLAG -440 176 0
FLAG -40 320 0
FLAG -536 240 0
FLAG -664 -320 IN
FLAG -552 96 0
SYMBOL cap 152 -192 R270
SYMATTR InstName C1
SYMATTR Value 4.7
SYMBOL nmos 248 -224 R0
SYMATTR InstName Q1
SYMATTR Value Si7850DP
SYMBOL res 280 -80 R0
SYMATTR InstName R1
SYMATTR Value 10m
SYMBOL ind 168 -304 R270
SYMATTR InstName L1
SYMATTR Value 22
SYMATTR SpiceLine Rpar=2K
SYMBOL res 424 -160 R0
SYMATTR InstName R2
SYMATTR Value 1Meg
SYMBOL res 424 -48 R0
SYMATTR InstName R3
SYMATTR Value 23.7K
SYMBOL schottky 344 -304 R270
SYMATTR InstName D1
SYMATTR Value MBRS360
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL res 648 -112 R0
SYMATTR InstName R4
SYMATTR Value .1
SYMBOL cap 520 -304 R0
SYMATTR InstName C2
SYMATTR Value 4.7
SYMBOL voltage -664 -320 R0
SYMATTR InstName V1
SYMATTR Value 10
SYMBOL res -472 -320 R0
SYMATTR InstName R5
SYMATTR Value 1Meg
SYMBOL res -472 -208 R0
SYMATTR InstName R6
SYMATTR Value 185K
SYMBOL cap -360 32 R90
SYMATTR InstName C3
SYMATTR Value 1000p
SYMATTR SpiceLine Rser=10K
SYMBOL nmos 616 160 R0
SYMATTR InstName Q2
SYMATTR Value Si7850DP
SYMBOL LED 648 32 R0
SYMATTR Value LXK2-PW14
SYMATTR Value2 N=10
SYMATTR InstName D2
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL cap -232 96 R90
SYMATTR InstName C4
SYMATTR Value .001
SYMBOL res -280 160 R90
SYMATTR InstName R7
SYMATTR Value 28.7K
SYMBOL voltage -424 240 R90
SYMATTR InstName V2
SYMATTR Value PULSE(0 5 2m 1u 1u 125u 250u)
SYMBOL res -328 -128 R270
SYMATTR InstName R8
SYMATTR Value 100K
SYMBOL res -568 -128 R0
SYMATTR InstName R9
SYMATTR Value 332K
SYMBOL res -568 -16 R0
SYMATTR InstName R10
SYMATTR Value 40.2K
SYMBOL PowerProducts\\LT3756 -40 16 R0
SYMATTR InstName U1