Version 4
SHEET 1 1728 1024
WIRE -1840 -400 -1840 -432
WIRE -1840 -304 -1840 -320
WIRE -1264 -80 -1296 -80
WIRE -1248 -80 -1264 -80
WIRE -1136 -80 -1136 -144
WIRE -1136 -80 -1168 -80
WIRE -1664 -32 -1664 -48
WIRE -1696 -16 -1712 -16
WIRE -1616 0 -1632 0
WIRE -1600 0 -1616 0
WIRE -1552 0 -1600 0
WIRE -1456 0 -1472 0
WIRE -1344 0 -1376 0
WIRE -1136 0 -1136 -80
WIRE -1792 16 -1872 16
WIRE -1744 16 -1792 16
WIRE -1696 16 -1744 16
WIRE -1600 16 -1600 0
WIRE -1744 96 -1744 16
WIRE -1712 112 -1712 -16
WIRE -1600 112 -1600 80
WIRE -1600 112 -1712 112
WIRE -1552 112 -1600 112
WIRE -1296 112 -1296 16
WIRE -1296 112 -1472 112
WIRE -1872 128 -1872 16
WIRE -1296 128 -1296 112
WIRE -1744 240 -1744 176
WIRE -1664 240 -1664 32
WIRE -1664 240 -1744 240
WIRE -1296 240 -1296 208
WIRE -1296 240 -1664 240
WIRE -1200 240 -1296 240
WIRE -1168 240 -1200 240
WIRE -1136 240 -1136 80
WIRE -1136 240 -1168 240
WIRE -1200 272 -1200 240
WIRE -1872 304 -1872 208
FLAG -1264 -80 out-n
FLAG -1200 272 0
FLAG -1664 -48 -48V
FLAG -1168 240 -Ub
FLAG -1840 -432 -48V
FLAG -1840 -304 0
FLAG -1872 304 0
FLAG -1616 0 Q
FLAG -1792 16 noninv
SYMBOL nmos -1344 -80 R0
SYMATTR InstName M1
SYMATTR Value IRFP240
SYMBOL Opamps\\opamp2 -1664 -64 R0
WINDOW 3 19 -1 Left 2
SYMATTR Value LM358
SYMATTR InstName U1
SYMBOL cap -1616 16 R0
SYMATTR InstName C1
SYMATTR Value 1n
SYMBOL Misc\\EuropeanResistor -1568 128 R270
WINDOW 0 27 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName R1
SYMATTR Value 43k
SYMBOL Misc\\EuropeanResistor -1280 224 R180
WINDOW 0 31 76 Left 2
WINDOW 3 31 40 Left 2
SYMATTR InstName R2
SYMATTR Value .47
SYMBOL Misc\\EuropeanResistor -1568 16 R270
WINDOW 0 27 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName R4
SYMATTR Value 100
SYMBOL voltage -1136 -16 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V3
SYMATTR Value 60
SYMBOL Misc\\EuropeanResistor -1728 192 R180
WINDOW 0 31 76 Left 2
WINDOW 3 31 40 Left 2
SYMATTR InstName R6
SYMATTR Value 1Meg
SYMBOL Misc\\EuropeanResistor -1264 -64 R270
WINDOW 0 27 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName R17
SYMATTR Value 20
SYMBOL voltage -1472 0 R270
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
WINDOW 3 52 111 VLeft 2
WINDOW 0 -54 57 VLeft 2
SYMATTR Value {Utol}
SYMATTR InstName V4
SYMBOL voltage -1840 -416 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
WINDOW 3 -55 87 Left 2
WINDOW 0 -54 24 Left 2
SYMATTR Value 12
SYMATTR InstName V1
SYMBOL voltage -1872 112 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
WINDOW 3 -52 106 Left 2
WINDOW 0 -54 24 Left 2
SYMATTR Value PULSE(0 1.2 1 1 1 1 4)
SYMATTR InstName V2
TEXT -1280 -480 Left 2 !.lib LM358.lib
TEXT -1280 -456 Left 2 !.lib IRFP9240.lib
TEXT -1280 -504 Left 2 !.opt plotwinsize=0
TEXT -1400 -480 Left 2 !.tran 0 5 0 .1
TEXT -1408 -512 Left 2 ;.param Uin 1.44
TEXT -1472 -80 Left 2 !.step param Utol 0 2 1
TEXT -1640 -472 Left 2 !.meas Io avg I(R17)
TEXT -1528 160 Left 2 ;(43k)
TEXT -1376 184 Left 2 ;(.47)
TEXT -1440 -408 Left 2 ;.step param Utol 0 2 .2\n.temp 15 75
TEXT -1752 -400 Left 2 ;.param Uin 0\n.step param Utol 0 2 .2\n.step param R2 list .42 .47 .52\n.temp 15 75