Version 4
SHEET 1 1512 680
WIRE 656 -48 544 -48
WIRE 800 -48 656 -48
WIRE -128 -32 -224 -32
WIRE -16 -32 -128 -32
WIRE 80 -32 -16 -32
WIRE 160 -32 80 -32
WIRE 384 -32 160 -32
WIRE 496 -16 448 -16
WIRE -16 0 -16 -32
WIRE 448 0 448 -16
WIRE 800 0 800 -48
WIRE 160 16 160 -32
WIRE 544 16 544 -48
WIRE 496 32 496 -16
WIRE 656 32 656 -48
WIRE 80 48 80 -32
WIRE 464 80 448 80
WIRE 496 80 464 80
WIRE 0 96 -16 96
WIRE 16 96 0 96
WIRE 464 112 464 80
WIRE 800 112 800 80
WIRE -80 160 -80 48
WIRE 0 160 0 96
WIRE 0 160 -80 160
WIRE 80 176 80 144
WIRE 256 176 80 176
WIRE 384 192 384 -32
WIRE 544 192 544 96
WIRE 608 192 608 176
WIRE 608 192 544 192
WIRE 656 192 656 96
WIRE 656 192 608 192
WIRE 688 192 656 192
WIRE 800 192 768 192
WIRE -224 208 -224 -32
WIRE 160 208 160 96
WIRE 160 208 80 208
WIRE 0 224 0 160
WIRE 160 224 160 208
WIRE 256 240 256 176
WIRE 320 240 256 240
WIRE 544 240 544 192
WIRE -128 272 -128 -32
WIRE 80 272 80 208
WIRE 80 272 64 272
WIRE 96 272 80 272
WIRE 384 320 384 288
WIRE 448 320 384 320
WIRE 480 320 448 320
WIRE 496 320 480 320
WIRE 160 336 160 320
WIRE 160 336 80 336
WIRE 384 336 384 320
WIRE 800 336 800 192
WIRE 160 352 160 336
WIRE 448 352 448 320
WIRE 256 384 256 240
WIRE 320 384 256 384
WIRE 80 400 80 336
WIRE 96 400 80 400
WIRE 480 400 480 320
WIRE 0 416 0 320
WIRE 256 416 256 384
WIRE 160 464 160 448
WIRE 160 464 64 464
WIRE 192 464 160 464
WIRE 384 512 384 432
WIRE 384 512 256 512
WIRE 480 512 480 464
WIRE 480 512 384 512
WIRE 544 512 544 336
WIRE 544 512 480 512
WIRE 720 512 544 512
WIRE 800 512 800 416
WIRE 800 512 720 512
WIRE -224 528 -224 272
WIRE -128 528 -128 352
WIRE -128 528 -224 528
WIRE 384 528 384 512
WIRE 384 528 -128 528
WIRE 720 560 720 512
WIRE 0 592 0 512
WIRE 80 592 0 592
WIRE 656 592 656 192
WIRE 656 592 160 592
FLAG 800 112 0
FLAG 720 560 0
FLAG 464 112 0
FLAG 448 352 Vg
FLAG 608 176 Vd
SYMBOL PNP 16 144 M180
WINDOW 0 45 32 Left 0
WINDOW 3 47 66 Left 0
SYMATTR InstName Q1
SYMBOL PNP -80 96 M180
WINDOW 0 51 32 Left 0
WINDOW 3 52 68 Left 0
SYMATTR InstName Q2
SYMBOL PNP 320 432 M180
WINDOW 0 59 32 Left 0
WINDOW 3 59 68 Left 0
SYMATTR InstName Q3
SYMBOL NPN 320 192 R0
SYMATTR InstName Q4
SYMBOL NPN 192 416 R0
SYMATTR InstName Q5
SYMBOL NPN 96 224 R0
SYMATTR InstName Q6
SYMBOL NPN 64 224 M0
SYMATTR InstName Q7
SYMBOL NPN 64 512 R180
SYMATTR InstName Q8
SYMBOL res 144 0 R0
SYMATTR InstName R1
SYMATTR Value 1E4
SYMBOL NMOS 496 240 R0
WINDOW 0 -35 42 Left 0
WINDOW 3 -30 -13 Left 0
SYMATTR InstName M1
SYMATTR Value STB120NF10
SYMBOL VOLTAGE -128 256 R0
WINDOW 123 0 0 Left 0
WINDOW 39 4 137 Left 0
SYMATTR SpiceLine Rser=1
SYMATTR InstName V1
SYMATTR Value 10
SYMBOL cap -240 208 R0
SYMATTR InstName C1
SYMATTR Value 1E-7
SYMBOL res 176 576 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R2
SYMATTR Value 1E2
SYMBOL VOLTAGE 800 320 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value 5
SYMBOL VOLTAGE 800 -16 R0
WINDOW 3 26 104 Left 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR Value 10
SYMATTR InstName V3
SYMBOL ind 784 176 R90
WINDOW 0 5 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName L1
SYMATTR Value 1E-6
SYMBOL SW 544 0 R0
WINDOW 38 24 132 Left 0
SYMATTR SpiceModel PL
SYMATTR InstName S1
SYMBOL schottky 672 96 R180
WINDOW 0 24 72 Left 0
WINDOW 3 -94 -3 Left 0
SYMATTR InstName D1
SYMATTR Value MBRS360
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL VOLTAGE 448 96 R180
WINDOW 0 24 104 Left 0
WINDOW 3 -151 200 Left 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V4
SYMATTR Value PULSE(-5 5 0 0 0 5E-6 1E-5)
SYMBOL schottky 496 464 R180
WINDOW 0 -17 71 Left 0
WINDOW 3 -46 -7 Left 0
SYMATTR InstName D2
SYMATTR Value MBR0520L
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL npn 96 352 R0
SYMATTR InstName Q9
TEXT 224 -72 Left 0 !.model PL SW(Ron=10m Roff=1Meg Vt=2 Vh=-1)
TEXT -216 -72 Left 0 !.tran 0 4.9045E-4 4.903E-4
TEXT -208 -104 Left 0 ;SR5a004off.asc
TEXT 888 -32 Left 0 ;Note: Gate enhancement, at 4V5, is sufficient to \nregulate the reverse fet voltage at 160mV prior \nto turn-off. This enhancement is successfully \nreduced to 1V prior to fet drain current reversal, \nin ~6nSec, however significant drain current is \nstill drawn by the source as the fet drain voltage \nrises at 500v/uSec.\n \nAs the inductor increases, reducing peak current,  \nthe current at the time of injection/accumulation \nis reduced, but the peak current drawn by the \nsource increases, \n \nWhat element of the fet model is responsible for \nthis current flow?