This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

LM74700-Q1使能3.3V,VCAP和ANODE压差为6V左右,GATE无输出,MOS发热严重

此为应用电路图,R167未焊接,DCPEN网络标号为3.3V,B+与GND1为输入26V, C67电容0.1uF换过为1uF测试,P+为输出,出现情况为有时VCAP和ANODE压差为6V左右,GATE与 CATHODE压差小于1V,MOS未开启,MOS发热严重,关断负载开关,再重新开启负载开关,VCAP和ANODE压差为12V左右,GATE与 CATHODE压差2.5V左右,MOS开启,不发热。出现情况,负载启动的时候MOS发热,重新开关负载,输出又正常