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UCC28056: Study UCC28056 reference designs of High voltage startup circuit

Part Number: UCC28056
Other Parts Discussed in Thread: UCC28780, TIDA-010047

Hi Team

There is a good new that DIN UCC28056

I found a reference design https://www.ti.com/tool/TIDA-010047

And ne of the circuit " High voltage startup " , I am not sure about its function and operation principle!

>>Please help explain its working sequence, such as which MOS turns on first after the voltage comes in...... THX