* SPICE netlist
MQ1 N006 N008 N009 N009 Si4848DY
R1 N010 0 63.4K
R2 N013 0 15.8K
R3 OUT N013 105K
L1 IN N006 28.8 Rpar=3K
D1 N003 OUT MBRS360
R4 N012 N011 10K
C2 N011 0 .01
V1 IN 0 54
C3 N001 0 4.7
C4 N007 0 .01
R5 N004 0 44.2K
R6 IN N004 1Meg
R7 N009 0 .03
XU1 N012 N013 N007 N010 MP_01 N009 N008 N001 N004 IN 0 LT3758 ;pnba Vc)FBX)SS)Rt))Sense)Gate)INTVcc)_SHDN/UVLO)Vin)GND
C5 N012 0 100p
R8 IN N005 6.2K
C6 IN N005 .022
D2 N006 N005 ES1D
L2 0 N003 3.2 Rpar=1K
D3 N002 N001 1N4148
R9 OUT N002 5.1
Rload OUT 0 10
C1 OUT 0 47
.tran 2m startup
K1 L1 L2 .99

* LTspice schematic (.asc)
Version 4
SHEET 1 1456 576
WIRE 40 -272 -40 -272
WIRE 152 -272 104 -272
WIRE 568 -272 232 -272
WIRE -632 -224 -728 -224
WIRE -232 -224 -632 -224
WIRE 24 -224 -232 -224
WIRE 120 -224 24 -224
WIRE 328 -224 120 -224
WIRE 472 -224 376 -224
WIRE 568 -224 568 -272
WIRE 568 -224 536 -224
WIRE 632 -224 568 -224
WIRE 728 -224 632 -224
WIRE -728 -208 -728 -224
WIRE -632 -208 -632 -224
WIRE 24 -208 24 -224
WIRE 120 -208 120 -224
WIRE 328 -208 328 -224
WIRE 376 -208 376 -224
WIRE 632 -208 632 -224
WIRE 728 -208 728 -224
WIRE -232 -176 -232 -224
WIRE -728 -112 -728 -128
WIRE -632 -112 -632 -128
WIRE -392 -112 -632 -112
WIRE -40 -112 -40 -272
WIRE -40 -112 -72 -112
WIRE 24 -112 24 -144
WIRE 120 -112 120 -128
WIRE 120 -112 24 -112
WIRE 184 -112 120 -112
WIRE 328 -112 328 -128
WIRE 328 -112 248 -112
WIRE 376 -112 376 -128
WIRE 632 -112 632 -144
WIRE 728 -112 728 -128
WIRE -632 -96 -632 -112
WIRE 328 -96 328 -112
WIRE -488 -16 -504 -16
WIRE -392 -16 -424 -16
WIRE 280 -16 -72 -16
WIRE -632 0 -632 -16
WIRE 328 16 328 0
WIRE 328 16 264 16
WIRE 328 32 328 16
WIRE 568 48 568 -224
WIRE -488 80 -504 80
WIRE -392 80 -408 80
WIRE 264 80 264 16
WIRE 264 80 -72 80
WIRE 328 128 328 112
WIRE -552 176 -600 176
WIRE -456 176 -472 176
WIRE -392 176 -456 176
WIRE 568 176 568 128
WIRE 568 176 -72 176
WIRE -600 192 -600 176
WIRE -456 192 -456 176
WIRE 568 192 568 176
WIRE -232 256 -232 240
WIRE -600 272 -600 256
WIRE -456 272 -456 256
WIRE 568 288 568 272
FLAG -504 80 0
FLAG 568 288 0
FLAG -232 256 0
FLAG 632 -112 0
FLAG -600 272 0
FLAG 728 -112 0
FLAG -728 -112 0
FLAG -504 -16 0
FLAG -40 -48 0
FLAG 728 -224 OUT
FLAG -728 -224 IN
FLAG -632 0 0
FLAG 328 128 0
FLAG -456 272 0
FLAG 376 -112 0
SYMBOL NMOS 280 -96 R0
SYMATTR InstName Q1
SYMATTR Value Si4848DY
SYMBOL RES -392 64 R90
SYMATTR InstName R1
SYMATTR Value 63.4K
SYMBOL res 552 176 R0
SYMATTR InstName R2
SYMATTR Value 15.8K
SYMBOL res 552 32 R0
SYMATTR InstName R3
SYMATTR Value 105K
SYMBOL ind2 312 -224 R0
SYMATTR InstName L1
SYMATTR Value 28.8
SYMATTR Type ind
SYMATTR SpiceLine Rpar=3K
SYMBOL schottky 472 -208 R270
SYMATTR InstName D1
SYMATTR Value MBRS360
SYMBOL res -456 160 R90
SYMATTR InstName R4
SYMATTR Value 10K
SYMBOL cap -616 192 R0
SYMATTR InstName C2
SYMATTR Value .01
SYMBOL VOLTAGE -728 -224 R0
SYMATTR InstName V1
SYMATTR Value 54
SYMBOL polcap -56 -112 R0
SYMATTR InstName C3
SYMATTR Value 4.7
SYMBOL cap -424 -32 R90
SYMATTR InstName C4
SYMATTR Value .01
SYMBOL res -648 -112 R0
SYMATTR InstName R5
SYMATTR Value 44.2K
SYMBOL res -648 -224 R0
SYMATTR InstName R6
SYMATTR Value 1Meg
SYMBOL res 312 16 R0
SYMATTR InstName R7
SYMATTR Value .03
SYMBOL PowerProducts\\LT3758 -232 32 R0
SYMATTR InstName U1
SYMBOL cap -472 192 R0
SYMATTR InstName C5
SYMATTR Value 100p
SYMBOL res 104 -224 R0
SYMATTR InstName R8
SYMATTR Value 6.2K
SYMBOL cap 8 -208 R0
SYMATTR InstName C6
SYMATTR Value .022
SYMBOL diode 248 -128 R90
SYMATTR InstName D2
SYMATTR Value ES1D
SYMBOL ind2 392 -112 R180
SYMATTR InstName L2
SYMATTR Value 3.2
SYMATTR Type ind
SYMATTR SpiceLine Rpar=1K
SYMBOL diode 104 -288 R90
SYMATTR InstName D3
SYMATTR Value 1N4148
SYMBOL res 248 -288 R90
SYMATTR InstName R9
SYMATTR Value 5.1
SYMBOL res 712 -224 R0
SYMATTR InstName Rload
SYMATTR Value 10
SYMBOL cap 616 -208 R0
SYMATTR InstName C1
SYMATTR Value 47