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Comparator Circuit of TL431

2015-01-04 11:00  
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Comparator Circuit of TL431
The picture a,b,c are comparator circuits of TL431.The picture (a) is comparator circuit of TL431.When input voltag9be Ui≥2.5V,the output voltage U。=2V;Ui<2.5V,the output U。=Ucc. The picture (b) is protection voltage of TL431.When input voltage Ui exceeds 1+RRP1/R1)UREF, a larger current flows through the fuse,FU burns out to achieve the purpose of voltage protection.The picture (c) is delay circuit of TL431,the voltage on C1 is zero,TL431 stops and LED does not shine.With C1 charging voltage rises,TL431 conducts, LED displays by shining.The delay time(from input voltage to LED shining)is R1C1ln[Ui/(Ui-UREF)].S1 is reset switch, when it is connected,C1 discharges and prepares for the next delay.