* SPICE netlist
MQ1 N003 N007 N004 N004 FDMS86500DC
R1 N002 N003 30m
V1 N001 0 PWL(0 0 2m 12)
MQ2 N013 N012 N014 N014 FDMS86500DC
R2 N002 N013 30m
S1 N005 N004 N006 0 SW
R3 N005 0 1K
C1 N005 0 1m Rser=10m
V2 N006 0 PWL(0 0 60m 0 60.01m 1)
C2 N008 0 220n
C3 N011 0 220n
R4 N002 N009 10K
R5 N002 N010 10K
XU1 N009 N002 N002 N003 N007 N004 N008 0 0 N011 N014 N012 N013 N002 N002 N010 LTC4226-1 ;pnba _FAULT1)ON1)VCC1)SENSE1)GATE1)OUT1)FTMR1)GND)CLS)FTMR2)OUT2)GATE2)SENSE2)VCC2)ON2)_FAULT2
D1 N001 N002 SS3P5
S2 N015 N014 N016 0 SW
R6 N015 0 1K
C4 N015 0 1m Rser=10m
V3 N016 0 PWL(0 0 60m 0 60.01m 1)
D2 0 N002 SMCJ33A
.tran 70m

* LTspice schematic (.asc)
Version 4
SHEET 1 1424 752
WIRE -520 -376 -712 -376
WIRE -424 -376 -456 -376
WIRE -360 -376 -424 -376
WIRE -280 -376 -360 -376
WIRE -152 -376 -280 -376
WIRE -56 -376 -72 -376
WIRE -40 -376 -56 -376
WIRE 136 -376 56 -376
WIRE 408 -376 136 -376
WIRE 600 -376 488 -376
WIRE 712 -376 600 -376
WIRE 600 -360 600 -376
WIRE 712 -360 712 -376
WIRE -712 -344 -712 -376
WIRE -280 -344 -280 -376
WIRE 472 -312 472 -328
WIRE -360 -280 -360 -376
WIRE 424 -264 424 -328
WIRE 600 -264 600 -280
WIRE 712 -264 712 -296
WIRE -712 -232 -712 -264
WIRE -152 -232 -152 -376
WIRE -56 -232 -56 -376
WIRE 40 -232 40 -328
WIRE 136 -232 136 -376
WIRE -424 -184 -424 -376
WIRE -264 -184 -424 -184
WIRE 424 -168 424 -184
WIRE 264 -152 248 -152
WIRE 344 -152 328 -152
WIRE -280 -136 -280 -264
WIRE -264 -136 -280 -136
WIRE -264 -88 -280 -88
WIRE 344 -88 248 -88
WIRE -360 -40 -360 -200
WIRE -264 -40 -360 -40
WIRE 264 -24 248 -24
WIRE 344 -24 328 -24
WIRE -424 8 -424 -184
WIRE -264 8 -424 8
WIRE 40 136 40 56
WIRE -424 184 -424 8
WIRE -152 184 -152 56
WIRE -152 184 -424 184
WIRE -56 184 -56 56
WIRE -56 184 -72 184
WIRE -40 184 -56 184
WIRE 136 184 136 56
WIRE 136 184 56 184
WIRE 408 184 136 184
WIRE 600 184 488 184
WIRE 712 184 600 184
WIRE 600 200 600 184
WIRE 712 200 712 184
WIRE -424 216 -424 184
WIRE 424 280 424 232
WIRE 600 296 600 280
WIRE 712 296 712 264
WIRE -424 312 -424 280
WIRE 424 376 424 360
FLAG -712 -232 0
FLAG 600 -264 0
FLAG 712 -264 0
FLAG 424 -168 0
FLAG 344 -88 0
FLAG 472 -312 0
FLAG 600 296 0
FLAG 712 296 0
FLAG 424 376 0
FLAG 472 232 0
FLAG -424 312 0
FLAG -280 -88 0
FLAG 344 -152 0
FLAG 344 -24 0
SYMBOL nmos -40 -328 R270
SYMATTR InstName Q1
SYMATTR Value FDMS86500DC
SYMBOL res -168 -360 R270
SYMATTR InstName R1
SYMATTR Value 30m
SYMBOL voltage -712 -360 R0
SYMATTR InstName V1
SYMATTR Value PWL(0 0 2m 12)
SYMBOL nmos -40 136 M90
SYMATTR InstName Q2
SYMATTR Value FDMS86500DC
SYMBOL res -168 200 R270
SYMATTR InstName R2
SYMATTR Value 30m
SYMBOL sw 504 -376 M270
SYMATTR InstName S1
SYMBOL res 584 -376 R0
SYMATTR InstName R3
SYMATTR Value 1K
SYMBOL cap 696 -360 R0
SYMATTR Value2 Rser=10m
SYMATTR Value 1m
SYMATTR InstName C1
SYMBOL voltage 424 -280 R0
SYMATTR InstName V2
SYMATTR Value PWL(0 0 60m 0 60.01m 1)
SYMBOL cap 264 -136 R270
SYMATTR InstName C2
SYMATTR Value 220n
SYMBOL cap 264 -8 R270
SYMATTR InstName C3
SYMATTR Value 220n
SYMBOL res -296 -360 R0
SYMATTR InstName R4
SYMATTR Value 10K
SYMBOL res -376 -296 R0
SYMATTR InstName R5
SYMATTR Value 10K
SYMBOL LTC4226-1 -8 -72 R0
SYMATTR InstName U1
SYMBOL schottky -520 -360 R270
SYMATTR InstName D1
SYMATTR Value SS3P5
SYMBOL sw 504 184 M270
SYMATTR InstName S2
SYMBOL res 584 184 R0
SYMATTR InstName R6
SYMATTR Value 1K
SYMBOL cap 696 200 R0
SYMATTR Value2 Rser=10m
SYMATTR Value 1m
SYMATTR InstName C4
SYMBOL voltage 424 264 R0
SYMATTR InstName V3
SYMATTR Value PWL(0 0 60m 0 60.01m 1)
SYMBOL TVSdiode -440 280 M180
SYMATTR InstName D2
SYMATTR Value SMCJ33A
SYMATTR Type zener