Version 4 SHEET 1 2512 1036 WIRE 768 -192 160 -192 WIRE 1008 -192 768 -192 WIRE 768 -160 768 -192 WIRE 1008 -160 1008 -192 WIRE 768 -48 768 -80 WIRE 848 -48 768 -48 WIRE 848 -32 848 -48 WIRE 304 -16 288 -16 WIRE 512 -16 304 -16 WIRE 512 32 512 -16 WIRE 160 64 160 -192 WIRE 288 64 288 -16 WIRE 624 64 608 64 WIRE 1008 64 1008 -80 WIRE 1008 64 704 64 WIRE 1104 64 1008 64 WIRE 1008 96 1008 64 WIRE 768 112 768 -48 WIRE 512 144 512 112 WIRE 512 144 448 144 WIRE 608 144 608 64 WIRE 608 144 512 144 WIRE 736 144 608 144 WIRE 848 144 848 48 WIRE 944 144 848 144 WIRE 512 160 512 144 WIRE 848 160 848 144 WIRE 160 176 160 144 WIRE 288 176 288 144 WIRE 512 272 512 240 WIRE 768 272 768 176 WIRE 768 272 512 272 WIRE 848 272 848 240 WIRE 848 272 768 272 WIRE 1008 272 1008 192 WIRE 1008 272 848 272 WIRE 512 288 512 272 FLAG 512 288 0 FLAG 288 176 0 FLAG 304 -16 IN FLAG 1104 64 OUT FLAG 160 176 0 FLAG 448 144 VREF FLAG 848 -48 IN_ SYMBOL res 496 144 R0 SYMATTR InstName R4 SYMATTR Value 4k7 SYMBOL res 496 16 R0 SYMATTR InstName R7 SYMATTR Value 25k SYMBOL voltage 288 48 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 WINDOW 3 -80 166 Left 2 SYMATTR Value PWL(0 0 1 24 2 0) SYMATTR InstName V1 SYMBOL voltage 160 48 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V2 SYMATTR Value 5V SYMBOL res 992 -176 R0 SYMATTR InstName R2 SYMATTR Value 4.7k SYMBOL npn 944 96 R0 SYMATTR InstName Q1 SYMATTR Value BC847C SYMBOL TL431 768 144 M0 SYMATTR InstName U1 SYMATTR Value TL431 SYMBOL res 832 144 R0 SYMATTR InstName R5 SYMATTR Value 1k SYMBOL res 832 -48 R0 SYMATTR InstName R6 SYMATTR Value 4.7k SYMBOL res 752 -176 R0 SYMATTR InstName R8 SYMATTR Value 470 SYMBOL res 720 48 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R3 SYMATTR Value 470k TEXT 136 296 Left 2 !.tran 0 2 0 100u TEXT 128 432 Left 2 !*******************************************************************\n** Released by: Analog eLab Design Center, Texas Instruments Inc.\n* Part: TL431\n* Date: 12/14/2009\n* Model Type: Transient and AC\n*******************************************************************\n.SUBCKT TL431 7 6 11\n* K A FDBK\nV1 1 6 2.495\nR1 6 2 15.6\nC1 2 6 .5U\nR2 2 3 100\nC2 3 4 .08U\nR3 4 6 10\nGB1 6 8 VALUE = {IF(V(3,6)< 0 , 1.73*V(3,6) -1U , -1U)}\nD1 5 8 DCLAMP\nD2 7 8 DCLAMP\nV4 5 6 2\nG1 6 2 1 11 0.11\n.MODEL DCLAMP D (IS=13.5N RS=25M N=1.59\n+ CJO=45P VJ=.75 M=.302 TT=50.4N BV=34V IBV=1MA)\n.ENDS TEXT 136 344 Left 2 ;.step param Rhyst list 100K 200K 500k 1Meg