The following is the circuit diagram of [IR1167 pin function diagram and application circuit] 
Working principle: When the primary circuit switch M1 is turned off, because the M2 has not been turned on, the current in the secondary circuit passes.
Parasitic diode of M2 (this is similar to the case of rectification with a rectifier diode).
The key to intelligent rectification control technology is to detect the voltage from the source to the drain of the rectifier switch. By comparing the two levels, the value determines when the synchronous rectifier switch is turned on and off. Turn on the switch when -VDS rises to VTH2, when -VDS
The switch is turned off when it drops to VTH1, and IR1167 is reset when VDS reaches VTH3.
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