Leakage detection chip-CN54123

The CN54123A/B/C/D is a precision, low-power, Ground Fault Circuit Interrupter (GFCI) controller used for detecting ground fault leakage paths in electrical circuits,witch can detect type AC leakage currents. When the leakage current occurs on the L and N lines, the ZCT(zero current transformer) will detect the leakage current signal,the post-circuit converts the leakage current signal into a voltage signal and transmits it to the input terminal of the chip, when the peak value of the input voltage signal exceeds 4.95mV, the output pin of the chip generates a high level with a minimum duration of 20ms to drive the external SCR. The CN54123A/B/C/D integrates functional modules such as regulated power supply, amplification circuit, comparison circuit, trip controller and trip drive circuit, and only needs current transformer and a small number of resistor capacitors externally.