* SPICE netlist
L0 SW0 OUT0 1 Rser=2.5m
CB0 BOOST0 SW0 0.1
C0 OUT0 0 200 Rser=2.5m Lser=.2n
I0 OUT0 0 PULSE(0 {2+4*(1-dofra)} {10u+1.39m*(1-dofra)} {1u+dofra*29u} 50u {100u+dofra}) load
V1 VIN 0 12
V2 EXTVCC 0 5
V3 RUN0 0 PWL(500u {dofra*5} 500.001u 5 3000u 5 3000.001u {dofra*5})
C3 0 VDD18 4.7
C4 0 DRVCC 10
C5 0 INTVCC 10
V4 CLK_EXT 0 PULSE(0 {5*(1-dofra)} 2.5m 1n 1n 500n 1u 500)
C6 CLK_EXT SYNC/PWM_CFG 1.5n
R1 SYNC/PWM_CFG 0 162k
R2 _ALERT EXTVCC 4700
R3 EXTVCC RUN1 {1+(1-dofra)*10k}
R6 PGOOD0 EXTVCC 10k
R7 _FAULT EXTVCC 10k
C7 0 N003 470p
R10 ITH1 N003 15k
L1 SW1 OUT1 470n Rser=2.5m
CB1 BOOST1 SW1 0.1
C1 OUT1 0 200 Rser=2.5m Lser=.2n
I1 OUT1 0 PULSE(0 {4*(1-dofra)} 1.9m 1u 1u 100u) load
XU1 VIN SW0 0 SW1 BOOST0 BOOST1 DRVCC INTVCC EXTVCC VDD18 _ALERT 0 N001 0 RUN0 PGOOD0 ITH1 SYNC/PWM_CFG VIN N002 0 RUN1 INTVCC PGOOD1 _FAULT _FAULT LT7182S FREQUENCY_SWITCH=1Meg MFR_PWM_PHASE_0=0 VOUT_COMMAND_0=3.3 HPLV_0=0 PulseSkipMode_0=1 ILIM_RANGE_0=2 GMEA_CONTROL_0=3 RITH_0=40k CITH_0=80p OUTPUT_DISCHARGE_0=1 VOUT_UV_FAULT_LIMIT_0=3.069 VOUT_OV_FAULT_LIMIT_0=3.63 VOUT_UV_WARN_LIMIT_0=3.086 VOUT_OV_WARN_LIMIT_0=3.5475 VIN_ON_0=1.5 VIN_OFF_0=1.45 TON_DELAY_0=0.01m TON_RISE_0={0.01m+0.49m*(1-dofra)} TOFF_DELAY_0=0.1m TOFF_FALL_0=0.3m MFR_PWM_PHASE_1=180 VOUT_COMMAND_1=0.8 HPLV_1=1 PulseSkipMode_1=0 ILIM_RANGE_1=2 GMEA_CONTROL_1=7 RITH_1=40k CITH_1=80p OUTPUT_DISCHARGE_1=1 VOUT_UV_FAULT_LIMIT_1=0.744 VOUT_OV_FAULT_LIMIT_1=0.88 VOUT_UV_WARN_LIMIT_1=0.748 VOUT_OV_WARN_LIMIT_1=0.86 VIN_ON_1=1.4 VIN_OFF_1=1.35 TON_DELAY_1={0.01m+0.09m*(1-dofra)} TON_RISE_1={0.01m+0.49m*(1-dofra)} TOFF_DELAY_1=0 TOFF_FALL_1=0.3m ;pnba PVIN0)SW0)SGND)SW1)BOOST0)BOOST1)DRVCC)INTVCC)EXTVCC)VDD18)_ALERT)PGND)VSENSE0P)VSENSE0N)RUN0)PGOOD0)ITH1)SYNC/PWM_CFG)PVIN1)VSENSE1P)VSENSE1N)RUN1)ITH0)PGOOD1)_FAULT0)_FAULT1
@1 OUT1 N002 delay=100u fstart=4k fend=256k oct=2 fcoarse=16k nmax=10k 4 100k 2 180k 2 181k 1 pp0=25m pp1=2.5m f0=10k f1=100k tavgmin=50 tsettle=10 intnode="ITH1"
@0 OUT0 N001 delay=50u fstart=4k fend=256k oct=2 fcoarse=16k nmax=4k 4 64k 2 180k 2 181k 1 pp0=240m pp1=15m f0=4k f1=64k tavgmin=50 tsettle=20
R4 RUN1 PGOOD1 10k
.ic V(OUT0)=3.3 V(OUT1)=0.8 V(BOOST0)=6.85
.param dofra=1
.options trtol=3
.fra

* LTspice schematic (.asc)
Version 4
SHEET 1 1744 1136
WIRE -232 -568 -248 -568
WIRE 168 -568 -232 -568
WIRE 328 -568 168 -568
WIRE -248 -552 -248 -568
WIRE 168 -520 168 -568
WIRE 328 -520 328 -568
WIRE -248 -456 -248 -472
WIRE 40 -456 -104 -456
WIRE 520 -456 456 -456
WIRE -104 -440 -104 -456
WIRE 520 -440 520 -456
WIRE -264 -360 -872 -360
WIRE -232 -360 -264 -360
WIRE -200 -360 -232 -360
WIRE -104 -360 -104 -376
WIRE -104 -360 -120 -360
WIRE 8 -360 -104 -360
WIRE 40 -360 8 -360
WIRE 488 -360 456 -360
WIRE 520 -360 520 -376
WIRE 520 -360 488 -360
WIRE 584 -360 520 -360
WIRE 728 -360 664 -360
WIRE 744 -360 728 -360
WIRE 792 -360 744 -360
WIRE 792 -296 792 -360
WIRE -232 -264 -232 -360
WIRE -88 -264 -232 -264
WIRE 40 -264 -24 -264
WIRE 536 -264 456 -264
WIRE 728 -264 728 -360
WIRE 728 -264 600 -264
WIRE -232 -248 -232 -264
WIRE 728 -248 728 -264
WIRE -872 -184 -872 -360
WIRE -232 -168 -232 -184
WIRE 40 -168 -232 -168
WIRE 728 -168 728 -184
WIRE 728 -168 456 -168
WIRE -232 -152 -232 -168
WIRE 728 -152 728 -168
WIRE 792 -152 792 -216
WIRE -872 -72 -872 -104
WIRE -8 -72 -776 -72
WIRE 40 -72 -8 -72
WIRE 504 -72 456 -72
WIRE 712 -72 504 -72
WIRE -152 24 -200 24
WIRE -24 24 -72 24
WIRE 40 24 -24 24
WIRE 520 24 456 24
WIRE 600 24 520 24
WIRE 712 24 712 -72
WIRE 712 24 680 24
WIRE 744 24 712 24
WIRE 872 24 824 24
WIRE -200 120 -200 24
WIRE -152 120 -200 120
WIRE -8 120 -72 120
WIRE 40 120 -8 120
WIRE 520 120 456 120
WIRE -200 216 -200 120
WIRE -152 216 -200 216
WIRE -8 216 -72 216
WIRE 40 216 -8 216
WIRE 504 216 456 216
WIRE 536 216 504 216
WIRE 616 216 600 216
WIRE -360 312 -376 312
WIRE -200 312 -200 216
WIRE -200 312 -280 312
WIRE -24 312 -200 312
WIRE 40 312 -24 312
WIRE 504 312 456 312
WIRE 536 312 504 312
WIRE 616 312 600 312
WIRE -472 408 -616 408
WIRE -280 408 -472 408
WIRE -168 408 -216 408
WIRE -56 408 -168 408
WIRE 40 408 -56 408
WIRE 504 408 456 408
WIRE 536 408 504 408
WIRE 616 408 600 408
WIRE -168 424 -168 408
WIRE -616 488 -616 408
WIRE 40 504 24 504
WIRE 488 504 456 504
WIRE 520 504 488 504
WIRE 616 504 600 504
WIRE 696 504 680 504
WIRE 168 568 168 552
WIRE 328 568 328 552
FLAG -104 -456 BOOST0
FLAG 8 -360 SW0
FLAG -232 -152 0
FLAG -872 -72 0
FLAG -264 -360 OUT0
FLAG -248 -456 0
FLAG -376 312 0
FLAG -776 8 0
FLAG -8 -72 RUN0
FLAG 616 312 0
FLAG 616 216 0
FLAG 504 312 VDD18
FLAG 504 216 DRVCC
FLAG 616 408 0
FLAG 504 408 INTVCC
FLAG 24 504 INTVCC
FLAG -616 568 0
FLAG -472 408 CLK_EXT
FLAG -56 408 SYNC/PWM_CFG
FLAG -168 504 0
FLAG 872 24 EXTVCC
FLAG -8 216 _ALERT
FLAG 520 24 PGOOD1
FLAG 520 120 _FAULT
FLAG -24 24 PGOOD0
FLAG -8 120 _FAULT
FLAG 504 -72 RUN1
FLAG 696 504 0
FLAG 328 568 0
FLAG 168 568 0
FLAG 488 504 ITH1
FLAG 520 -456 BOOST1
FLAG 488 -360 SW1
FLAG 728 -152 0
FLAG 792 -152 0
FLAG 744 -360 OUT1
FLAG -232 -568 VIN
FLAG -24 312 EXTVCC
SYMBOL ind -104 -344 M270
SYMATTR InstName L0
SYMATTR Value 1
SYMATTR SpiceLine Rser=2.5m
SYMBOL cap -120 -440 R0
SYMATTR InstName CB0
SYMATTR Value 0.1
SYMBOL cap -248 -248 R0
SYMATTR SpiceLine Rser=2.5m Lser=.2n
SYMATTR InstName C0
SYMATTR Value 200
SYMBOL current -872 -184 R0
SYMATTR SpiceLine load
SYMATTR Value PULSE(0 {2+4*(1-dofra)} {10u+1.39m*(1-dofra)} {1u+dofra*29u} 50u {100u+dofra})
SYMATTR InstName I0
SYMBOL voltage -248 -568 R0
SYMATTR InstName V1
SYMATTR Value 12
SYMBOL voltage -264 312 R90
SYMATTR InstName V2
SYMATTR Value 5
SYMBOL voltage -776 -88 M0
SYMATTR Value PWL(500u {dofra*5} 500.001u 5 3000u 5 3000.001u {dofra*5})
SYMATTR InstName V3
SYMBOL cap 600 328 M270
SYMATTR InstName C3
SYMATTR Value 4.7
SYMBOL cap 600 232 M270
SYMATTR InstName C4
SYMATTR Value 10
SYMBOL cap 600 424 M270
SYMATTR InstName C5
SYMATTR Value 10
SYMBOL voltage -616 472 M0
SYMATTR Value PULSE(0 {5*(1-dofra)} 2.5m 1n 1n 500n 1u 500)
SYMATTR InstName V4
SYMBOL cap -280 392 M90
SYMATTR InstName C6
SYMATTR Value 1.5n
SYMBOL res -184 408 R0
SYMATTR InstName R1
SYMATTR Value 162k
SYMBOL res -56 200 R90
SYMATTR InstName R2
SYMATTR Value 4700
SYMBOL res 840 8 R90
SYMATTR InstName R3
SYMATTR Value {1+(1-dofra)*10k}
SYMBOL res -56 8 R90
SYMATTR InstName R6
SYMATTR Value 10k
SYMBOL res -56 104 R90
SYMATTR InstName R7
SYMATTR Value 10k
SYMBOL cap 680 520 M270
SYMATTR InstName C7
SYMATTR Value 470p
SYMBOL res 504 520 R270
SYMATTR InstName R10
SYMATTR Value 15k
SYMBOL ind 568 -344 R270
SYMATTR InstName L1
SYMATTR Value 470n
SYMATTR SpiceLine Rser=2.5m
SYMBOL cap 504 -440 R0
SYMATTR InstName CB1
SYMATTR Value 0.1
SYMBOL cap 744 -248 M0
SYMATTR SpiceLine Rser=2.5m Lser=.2n
SYMATTR InstName C1
SYMATTR Value 200
SYMBOL current 792 -296 R0
SYMATTR SpiceLine load
SYMATTR Value PULSE(0 {4*(1-dofra)} 1.9m 1u 1u 100u)
SYMATTR InstName I1
SYMBOL LT7182S 248 24 R0
SYMATTR InstName U1
SYMATTR SpiceLine2 VOUT_UV_FAULT_LIMIT_1=0.744 VOUT_OV_FAULT_LIMIT_1=0.88 VOUT_UV_WARN_LIMIT_1=0.748 VOUT_OV_WARN_LIMIT_1=0.86 VIN_ON_1=1.4 VIN_OFF_1=1.35 TON_DELAY_1={0.01m+0.09m*(1-dofra)} TON_RISE_1={0.01m+0.49m*(1-dofra)}  TOFF_DELAY_1=0 TOFF_FALL_1=0.3m
SYMATTR Value2 VOUT_UV_FAULT_LIMIT_0=3.069 VOUT_OV_FAULT_LIMIT_0=3.63 VOUT_UV_WARN_LIMIT_0=3.086 VOUT_OV_WARN_LIMIT_0=3.5475 VIN_ON_0=1.5 VIN_OFF_0=1.45 TON_DELAY_0=0.01m TON_RISE_0={0.01m+0.49m*(1-dofra)}  TOFF_DELAY_0=0.1m TOFF_FALL_0=0.3m
SYMBOL fra 536 -264 R90
SYMATTR InstName @1
SYMATTR SpiceLine delay=100u fstart=4k fend=256k oct=2 fcoarse=16k nmax=10k 4 100k 2 180k 2 181k 1 pp0=25m pp1=2.5m f0=10k f1=100k tavgmin=50 tsettle=10 intnode="ITH1"
SYMBOL fra -24 -264 M90
SYMATTR InstName @0
SYMATTR SpiceLine delay=50u fstart=4k fend=256k oct=2 fcoarse=16k nmax=4k 4 64k 2 180k 2 181k 1 pp0=240m pp1=15m f0=4k f1=64k tavgmin=50 tsettle=20
SYMBOL res 696 8 R90
SYMATTR InstName R4
SYMATTR Value 10k