* SPICE netlist
R1 N015 0 .012
L1 IN N002 216 Rser=12m Rpar=5K
L2 N001 N003 10.7 Rser=4.5m
L3 N001 OUT 3.3 Rser=5m Rpar=10K
C2 OUT 0 47 Rser=10m
R2 OUT N021 137K
R3 N021 0 137K
R4 N014 N011 1.96K
R5 0 N014 1.87K
V1 IN 0 48
Rload1 OUT 0 .25
C3 0 N009 4.7
M1 N002 N012 N015 N015 BSC190N15NS3
R6 N011 IN 105K
R7 N019 N018 1K
R8 N013 N009 100
R9 0 N025 1K
XU3 N018 N020 N013 N025 PC817 Igain=3.4m ;pnba A)K)C)E
C8 0 N016 .01
C9 0 N022 .01
R13 N010 0 30.1K
R14 N026 0 57.6K
R15 N027 0 14.7K
R16 N028 0 44.2K
R19 N017 N015 1K
M2 N003 N006 0 0 BSC0902NSI
C10 OUT 0 560 V=16 Irms=920m Rser=0.08 Lser=0 mfg="Nichicon" pn="UPL1C561MRH6" type="Al electrolytic"
C11 N002 N004 68n
M4 N004 N008 0 0 Si7113DN
C12 N008 N007 100n
R20 N008 0 10K
D1 N008 0 BAT46WJ
R25 N023 N024 100K
R26 N024 N025 100K
C4 N019 N018 4.7n
XU2 MP_01 MP_02 N010 N024 N023 NC_03 N016 N026 N011 N014 N028 NC_04 NC_05 N027 MP_06 MP_07 N022 0 0 0 N017 N015 MP_08 N012 MP_09 N009 MP_10 IN MP_11 NC_12 MP_13 N007 LT3753 ;pnba ))Rt)FB)Comp)SYNC)SS1)Ivsec)UVLO_Vsec)OVLO)Tao)Tas)Tos)Tblnk)))SS2)GND)PGND)Isensen)Isensep)OC))OUT))INTVcc))Vin))SOUT))AOUT
C6 N013 0 1
M3 N001 N005 0 0 BSC0902NSI
R11 N003 N005 5
R12 N001 N006 5
XU1 N020 NC_14 OUT NC_15 0 0 NC_16 N021 LT1431 ;pnba Coll)Comp)V+)Rtop)GND-S)GND-F)Rmid)Ref
C5 N020 N021 3.3n Rser=34.8K
C1 OUT 0 1
R10 OUT N019 100
C7 N019 0 22
D2 0 N019 1N750
C13 N002 N004 .22 Rser=200
K1 L1 L2 1
.tran 5m startup

* LTspice schematic (.asc)
Version 4
SHEET 1 2288 1088
WIRE -1064 -544 -1144 -544
WIRE -760 -544 -1064 -544
WIRE 24 -544 -760 -544
WIRE 520 -544 232 -544
WIRE 568 -544 520 -544
WIRE 712 -544 648 -544
WIRE 808 -544 712 -544
WIRE 936 -544 808 -544
WIRE 1096 -544 936 -544
WIRE 1144 -544 1096 -544
WIRE -1144 -528 -1144 -544
WIRE 24 -528 24 -544
WIRE 104 -528 24 -528
WIRE 232 -528 232 -544
WIRE 232 -528 152 -528
WIRE 808 -528 808 -544
WIRE 936 -528 936 -544
WIRE 1144 -528 1144 -544
WIRE 104 -448 24 -448
WIRE 232 -448 152 -448
WIRE 808 -448 808 -464
WIRE 936 -448 936 -464
WIRE -1144 -432 -1144 -448
WIRE -72 -432 -88 -432
WIRE 24 -432 24 -448
WIRE 24 -432 -8 -432
WIRE 1144 -432 1144 -448
WIRE -88 -416 -88 -432
WIRE -72 -416 -88 -416
WIRE 232 -416 232 -448
WIRE 264 -416 232 -416
WIRE 360 -416 344 -416
WIRE 408 -416 392 -416
WIRE 520 -416 520 -544
WIRE 520 -416 488 -416
WIRE 232 -384 232 -416
WIRE 520 -384 520 -416
WIRE -664 -368 -664 -384
WIRE -568 -368 -568 -384
WIRE -72 -368 -72 -416
WIRE -56 -368 -72 -368
WIRE 24 -368 24 -432
WIRE 24 -368 8 -368
WIRE -344 -336 -472 -336
WIRE -264 -336 -280 -336
WIRE -168 -336 -264 -336
WIRE -136 -336 -168 -336
WIRE -264 -320 -264 -336
WIRE -168 -320 -168 -336
WIRE -1064 -304 -1064 -544
WIRE -88 -304 -88 -320
WIRE 360 -304 392 -416
WIRE 360 -304 280 -304
WIRE 392 -304 360 -416
WIRE 472 -304 392 -304
WIRE -568 -288 -568 -304
WIRE -344 -288 -568 -288
WIRE 24 -288 24 -368
WIRE -760 -272 -760 -544
WIRE -664 -272 -664 -288
WIRE -568 -272 -568 -288
WIRE -472 -272 -472 -336
WIRE 232 -272 232 -288
WIRE 520 -272 520 -288
WIRE -168 -240 -168 -256
WIRE -1064 -208 -1064 -224
WIRE -872 -208 -1064 -208
WIRE -24 -208 -360 -208
WIRE -1064 -192 -1064 -208
WIRE -344 -144 -344 -288
WIRE -216 -144 -344 -144
WIRE -56 -144 -136 -144
WIRE 168 -144 -56 -144
WIRE -56 -128 -56 -144
WIRE -872 -112 -1064 -112
WIRE -248 -112 -360 -112
WIRE -1064 -96 -1064 -112
WIRE -56 -48 -56 -64
WIRE -952 -16 -968 -16
WIRE -872 -16 -888 -16
WIRE -344 -16 -360 -16
WIRE -248 -16 -248 -112
WIRE -248 -16 -264 -16
WIRE 24 -16 24 -192
WIRE 24 -16 -248 -16
WIRE 440 -16 408 -16
WIRE 520 -16 504 -16
WIRE -1064 0 -1064 -16
WIRE 24 0 24 -16
WIRE 872 0 760 0
WIRE 1048 0 936 0
WIRE 1096 16 1096 -544
WIRE -952 80 -968 80
WIRE -872 80 -888 80
WIRE -344 80 -360 80
WIRE 168 80 168 -144
WIRE 200 80 168 80
WIRE 408 80 408 -16
WIRE 408 80 392 80
WIRE 424 80 408 80
WIRE 520 80 520 -16
WIRE 520 80 504 80
WIRE 24 96 24 80
WIRE 760 112 760 0
WIRE 776 112 760 112
WIRE 1048 112 1048 0
WIRE 1048 112 1032 112
WIRE 1096 112 1096 96
WIRE 1096 112 1048 112
WIRE 1096 128 1096 112
WIRE -344 176 -360 176
WIRE -248 176 -264 176
WIRE -232 176 -248 176
WIRE 136 176 -152 176
WIRE 200 176 136 176
WIRE 760 176 760 112
WIRE 760 176 392 176
WIRE 136 192 136 176
WIRE 1096 224 1096 208
WIRE 520 240 520 80
WIRE 520 240 408 240
WIRE 584 240 520 240
WIRE 712 240 712 -544
WIRE 712 240 664 240
WIRE 776 240 712 240
WIRE 1048 240 1032 240
WIRE 408 256 408 240
WIRE 520 256 520 240
WIRE 712 256 712 240
WIRE -872 272 -888 272
WIRE -248 272 -248 176
WIRE -248 272 -360 272
WIRE 136 288 136 272
WIRE 1048 304 1032 304
WIRE 408 336 408 320
WIRE 520 336 520 320
WIRE 712 336 712 320
WIRE -872 368 -888 368
WIRE -808 448 -808 432
WIRE -712 448 -712 432
WIRE -616 448 -616 432
WIRE -808 544 -808 528
WIRE -712 544 -712 528
WIRE -616 544 -616 528
FLAG 24 96 0
FLAG 808 -448 0
FLAG 1144 -432 0
FLAG 1096 224 0
FLAG -1064 0 0
FLAG -1144 -432 0
FLAG -1144 -544 IN
FLAG 1144 -544 OUT
FLAG -568 -384 0
FLAG 136 288 0
FLAG -968 -16 0
FLAG -968 80 0
FLAG -664 -384 0
FLAG -808 544 0
FLAG -712 544 0
FLAG -616 544 0
FLAG -344 80 0
FLAG 232 -272 0
FLAG 520 -272 0
FLAG 936 -448 0
FLAG -88 -304 0
FLAG -168 -240 0
FLAG -264 -240 0
FLAG -888 272 0
FLAG -888 368 0
FLAG -56 -48 0
FLAG 1048 240 0
FLAG 1048 304 0
FLAG 712 336 0
FLAG 520 336 0
FLAG 408 336 0
SYMBOL res 8 -16 R0
SYMATTR InstName R1
SYMATTR Value .012
SYMBOL ind2 88 -544 R0
SYMATTR InstName L1
SYMATTR Value 216
SYMATTR Type ind
SYMATTR SpiceLine Rser=12m Rpar=5K
SYMBOL ind2 168 -544 M0
SYMATTR InstName L2
SYMATTR Value 10.7
SYMATTR Type ind
SYMATTR SpiceLine Rser=4.5m
SYMBOL ind2 552 -528 R270
SYMATTR InstName L3
SYMATTR Value 3.3
SYMATTR SpiceLine Rser=5m Rpar=10K
SYMATTR Type ind
SYMBOL cap 792 -528 R0
SYMATTR Value 47
SYMATTR InstName C2
SYMATTR SpiceLine Rser=10m
SYMBOL res 1080 0 R0
SYMATTR Value 137K
SYMATTR InstName R2
SYMBOL res 1080 112 R0
SYMATTR InstName R3
SYMATTR Value 137K
SYMBOL res -1080 -96 M180
SYMATTR InstName R4
SYMATTR Value 1.96K
SYMBOL res -1080 0 M180
SYMATTR InstName R5
SYMATTR Value 1.87K
SYMBOL voltage -1144 -544 R0
SYMATTR InstName V1
SYMATTR Value 48
SYMBOL res 1128 -544 R0
SYMATTR InstName Rload1
SYMATTR Value .25
SYMBOL cap -584 -368 R0
SYMATTR InstName C3
SYMATTR Value 4.7
SYMBOL nmos -24 -288 R0
SYMATTR InstName M1
SYMATTR Value BSC190N15NS3
SYMBOL res -1080 -208 M180
SYMATTR InstName R6
SYMATTR Value 105K
SYMBOL res 520 64 R90
SYMATTR InstName R7
SYMATTR Value 1K
SYMBOL res -120 -128 M270
SYMATTR InstName R8
SYMATTR Value 100
SYMBOL res 120 288 M180
SYMATTR InstName R9
SYMATTR Value 1K
SYMBOL Optos\\PC817D 296 128 M0
SYMATTR InstName U3
SYMBOL cap -952 -32 M90
SYMATTR InstName C8
SYMATTR Value .01
SYMBOL cap -952 64 M90
SYMATTR InstName C9
SYMATTR Value .01
SYMBOL res -680 -272 M180
SYMATTR InstName R13
SYMATTR Value 30.1K
SYMBOL res -824 432 R0
SYMATTR InstName R14
SYMATTR Value 57.6K
SYMBOL res -728 432 R0
SYMATTR InstName R15
SYMATTR Value 14.7K
SYMBOL res -632 432 R0
SYMATTR InstName R16
SYMATTR Value 44.2K
SYMBOL res -360 0 R270
SYMATTR InstName R19
SYMATTR Value 1K
SYMBOL nmos 280 -384 M0
SYMATTR Value BSC0902NSI
SYMATTR InstName M2
SYMBOL polcap 920 -528 R0
SYMATTR Value 560
SYMATTR InstName C10
SYMATTR SpiceLine V=16 Irms=920m Rser=0.08 Lser=0 mfg="Nichicon" pn="UPL1C561MRH6" type="Al electrolytic"
SYMATTR Description Capacitor
SYMATTR Type cap
SYMBOL cap -8 -448 R90
SYMATTR InstName C11
SYMATTR Value 68n
SYMBOL pmos -136 -416 R0
SYMATTR InstName M4
SYMATTR Value Si7113DN
SYMBOL cap -280 -352 R90
SYMATTR InstName C12
SYMATTR Value 100n
SYMBOL res -280 -336 R0
SYMATTR InstName R20
SYMATTR Value 10K
SYMBOL schottky -184 -320 R0
SYMATTR InstName D1
SYMATTR Value BAT46WJ
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL res -360 192 R270
SYMATTR InstName R25
SYMATTR Value 100K
SYMBOL res -248 192 R270
SYMATTR InstName R26
SYMATTR Value 100K
SYMBOL cap 504 -32 R90
SYMATTR InstName C4
SYMATTR Value 4.7n
SYMBOL PowerProducts\\LT3753 -616 80 R0
SYMATTR InstName U2
SYMBOL cap -72 -128 R0
SYMATTR InstName C6
SYMATTR Value 1
SYMBOL nmos 472 -384 R0
SYMATTR Value BSC0902NSI
SYMATTR InstName M3
SYMBOL res 248 -400 R270
SYMATTR InstName R11
SYMATTR Value 5
SYMBOL res 504 -400 M270
SYMATTR InstName R12
SYMATTR Value 5
SYMBOL References\\LT1431 904 208 R0
SYMATTR InstName U1
SYMBOL cap 872 16 R270
SYMATTR InstName C5
SYMATTR Value 3.3n
SYMATTR SpiceLine Rser=34.8K
SYMBOL cap 696 256 R0
SYMATTR InstName C1
SYMATTR Value 1
SYMBOL res 680 224 R90
SYMATTR InstName R10
SYMATTR Value 100
SYMBOL cap 504 256 R0
SYMATTR InstName C7
SYMATTR Value 22
SYMBOL zener 392 320 M180
SYMATTR InstName D2
SYMATTR Value 1N750
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL cap 8 -384 R90
SYMATTR InstName C13
SYMATTR Value .22
SYMATTR SpiceLine Rser=200