Op amp common-mode voltage breakdown input stage and its protection measure circuit diagram

Published:2011/5/17 2:45:00 Author:Rebekka | Keyword: Op amp , common-mode voltage, breakdown input stage, protection measure | From:SeekIC

There is a current of the transistor collector junction flow from basal pole to collecting anode. If the source of resistance passes from feet 2 or feet ③ is low, then the collector junction current will be very large, and the input stage transistors will be damaged. In this case, remove the power supply voltage, and the signal source is not removed. The common-mode input will damage the ntegrated operational amplifier. Another case that makes the integrated operational amplifier common mode input failure is that the signal source has capacitive elements. The capacitance is charged to the high level of the signal source, remove the supply voltage and signal at the same time. Because the existance of charging voltage of the signal source capacitance, it is equivalent to the existance of signal source voltage. If the capacitor is greater than 0.1μF. The discharge current of the capacitor can burn the transistor.



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