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after the chip is started, the gt will output a high level, and the fo will continue to output a current-driven mos transistor tr . fo charges the gate of mos transistor tr , and the current ifo_on path is as follows: when mos transistor tr is turned on, the fo pin charges capacitor c through the body diode
power circuit can be equivalent to the equivalent circuit of the pick-up and holding stages. when the mos transistor tr is turned on, the contactor coil is excited, the coil current is increased, and the current path is, for example, i ; when tr is turned off, the contactor coil is demagnetized by the diode...
https://www.mornsun-power.com/uploads/pdf/SCM1501B.pdf