This chip is used for PFC circuit (totem pole) open-loop test. The Iac current is measured through the digital-to-analog signal board (ch2). It can be found that the signal is overmodulated, but the rated current is only 3A (ch4).
Image URL: https://upload.cc/i1/2021/08/17/b3shnM.jpg

1.The overcurrent function is detect Positive/negative IP or only Positive.
2.MCR1101-50's OVERCURRENT DETECTION (OCD) is fixed value(50A*1.2) or Adjustable. ex: setting OVERCURRENT DETECTION (OCD) is 30A.