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Op amp power supply over-voltage protection circuit diagram

2016-09-11 07:38  
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Op amp power supply over-voltage protection circuit diagram
Power supply over-voltage protection circuit is shown as above. Figure (a) is simple and practical over-voltage protection circuit, which uses Zener diode Dz to limit the integrated operational amplifier supply voltage within the safe voltage limit. The selection method of the regulator of the operating voltage can be based on the following formula: Vz ≤ 2Vsmax. Normally Vz should be close or equal to the total power supply voltage, its current limiting resistor R should use high-power resistance, and resistance value should ensure the voltage regulator tube is able to work properly. Figure (b) shows the two functions that overvoltage protection and transient voltage protection. When it is in normal operation mode, the tube pressure of J1 and J2 should be decrease, ± VSD value is low, so the two regulators Dz1 and Dz2 do not work, so none of them is breakdown.