* SPICE netlist
S1 0 OUT N002 0 SHORT
V1 IN 0 PWL(0 0 1m 12 20m 12 40m 4 50m 4 70m 12 120m 12 120.2m 80 130m 45 160m 12)
V2 N002 0 PWL(0 0 100m 0 101m 0 120m 0 121m 0)
R6 IN N008 280K
R7 N008 0 100K
RSNS IN N001 20m
R3 N003 N005 10
R1 OUT N010 59K
R2 N010 0 4.99K
C1 N004 0 22
C2 N011 0 1
R10 OUT N004 .5
R8 OUT N007 27K
R9 OUT N009 27K
R4 IN N006 1Meg
MQ1 N001 N003 OUT OUT IRF1310
Rload OUT 0 50
R5 N008 N006 1Meg
XU1 N011 N010 OUT N005 N001 IN N006 N009 N007 0 N006 N008 LT4356-2 ;pnba TMR)FB)OUT)Gate)SNS)Vcc)_SHDN)_FLT)EN)GND)Aout)IN+
C3 N005 0 .0068
.tran 240m

* LTspice schematic (.asc)
Version 4
SHEET 1 1664 640
WIRE -736 -320 -832 -320
WIRE -560 -320 -736 -320
WIRE -368 -320 -560 -320
WIRE -352 -320 -368 -320
WIRE -256 -320 -272 -320
WIRE -128 -320 -256 -320
WIRE 80 -320 -32 -320
WIRE 176 -320 80 -320
WIRE 272 -320 176 -320
WIRE 352 -320 272 -320
WIRE 464 -320 352 -320
WIRE 560 -320 464 -320
WIRE 688 -320 560 -320
WIRE 464 -304 464 -320
WIRE 560 -304 560 -320
WIRE 688 -304 688 -320
WIRE -400 -288 -368 -320
WIRE -224 -288 -256 -320
WIRE 832 -288 736 -288
WIRE 272 -272 272 -320
WIRE 832 -272 832 -288
WIRE -48 -256 -48 -272
WIRE -560 -240 -560 -320
WIRE 752 -240 736 -240
WIRE 464 -208 464 -224
WIRE 560 -192 560 -224
WIRE 688 -192 688 -224
WIRE 352 -176 352 -320
WIRE 832 -176 832 -192
WIRE 176 -160 176 -320
WIRE -144 -144 -160 -144
WIRE -48 -144 -48 -176
WIRE -48 -144 -80 -144
WIRE 464 -128 464 -144
WIRE -736 -112 -736 -320
WIRE -400 -96 -400 -288
WIRE -224 -96 -224 -288
WIRE -48 -96 -48 -144
WIRE 80 -96 80 -320
WIRE -560 -16 -560 -160
WIRE -480 -16 -560 -16
WIRE 272 -16 272 -192
WIRE 272 -16 144 -16
WIRE -736 48 -736 -32
WIRE -688 48 -736 48
WIRE -560 48 -560 -16
WIRE -560 48 -608 48
WIRE -480 48 -560 48
WIRE 352 48 352 -96
WIRE 352 48 144 48
WIRE -736 112 -736 48
WIRE -480 112 -736 112
WIRE 176 112 176 -80
WIRE 176 112 144 112
WIRE -736 128 -736 112
WIRE 176 144 176 112
WIRE -48 192 -48 176
WIRE -288 208 -288 176
WIRE -832 224 -832 -320
WIRE -736 224 -736 208
WIRE 176 256 176 224
WIRE -48 272 -48 256
WIRE -832 320 -832 304
FLAG -832 320 0
FLAG -832 -320 IN
FLAG 688 -320 OUT
FLAG 752 -240 0
FLAG -736 224 0
FLAG -288 208 0
FLAG -48 272 0
FLAG 176 256 0
FLAG 464 -128 0
FLAG 560 -192 0
FLAG 688 -192 0
FLAG 832 -176 0
FLAG -160 -144 0
SYMBOL SW 688 -208 R180
SYMATTR InstName S1
SYMATTR Value SHORT
SYMBOL voltage -832 208 R0
SYMATTR Value PWL(0 0 1m 12 20m 12 40m 4 50m 4 70m 12 120m 12 120.2m 80 130m 45 160m 12)
SYMATTR InstName V1
SYMBOL voltage 832 -288 R0
SYMATTR Value PWL(0 0 100m 0 101m 0 120m 0 121m 0)
SYMATTR InstName V2
SYMBOL res -752 -128 R0
SYMATTR InstName R6
SYMATTR Value 280K
SYMBOL res -752 112 R0
SYMATTR InstName R7
SYMATTR Value 100K
SYMBOL res -368 -304 R270
SYMATTR InstName RSNS
SYMATTR Value 20m
SYMBOL res -64 -272 R0
SYMATTR InstName R3
SYMATTR Value 10
SYMBOL res 160 -176 R0
SYMATTR InstName R1
SYMATTR Value 59K
SYMBOL res 160 128 R0
SYMATTR InstName R2
SYMATTR Value 4.99K
SYMBOL cap 448 -208 R0
SYMATTR InstName C1
SYMATTR Value 22
SYMBOL cap -64 192 R0
SYMATTR InstName C2
SYMATTR Value 1
SYMBOL res 448 -320 R0
SYMATTR InstName R10
SYMATTR Value .5
SYMBOL res 256 -288 R0
SYMATTR InstName R8
SYMATTR Value 27K
SYMBOL res 336 -192 R0
SYMATTR InstName R9
SYMATTR Value 27K
SYMBOL res -576 -256 R0
SYMATTR InstName R4
SYMATTR Value 1Meg
SYMBOL nmos -128 -272 R270
SYMATTR InstName Q1
SYMATTR Value IRF1310
SYMBOL res 544 -320 R0
SYMATTR InstName Rload
SYMATTR Value 50
SYMBOL res -704 64 R270
SYMATTR InstName R5
SYMATTR Value 1Meg
SYMBOL LT4356-2 -176 64 R0
SYMATTR InstName U1
SYMBOL cap -80 -160 R90
SYMATTR Value .0068
SYMATTR InstName C3