Abstract:

For the traditional leakage protector chip,high level generated by leakage electrical signal amplification and comparison are used to drive silicon controlled rectifier trip and power off.There is a problem of poor consistency of the tripping current.An innovative design idea is proposed.Which is setting the FUSE trimming module in the leakage protector chip amplifier unit and designing the circuit structure of high precision test of the amplifier.During wafer testing,input sensitivity accuracy of leakage protector chip is greatly improved and input sensitivity is controlled between 5.8~6.2 mV.The test result shows that the tripping current is controlled within 5%,which greatly improves the tripping current consistency,reliability and interference capability of the AC type leakage protector.

Key words: AC type leakage protector chip, input sensitivity, tripping current consistency, reliability and anti-interference capability