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UCC256301: Questions about blue stone HV pin

Part Number: UCC256301

Dear sir/ madam,

Regarding to  UCC25630X HV pin.

1. Why three resistor at HV pin?  

2. is one 5k resistor here okay?

3. how to test the X capacitor discharging waveform with EVM board.?

i failed to test the result shown on UCC25630X EVM user guide.

what is test is the voltage of x cap(C3,C4 on the EVM )  go to zero immediately when the AC power turn off.