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LT8390 TG1 mosfet issue

Category: Hardware
Product Number: LT8390


I made a high power DC/DC converter and the mosfet TG1 doesn´t open, the waveform Vgs is:


and the Vg refered to ground (blue) and sw1(ellow) node is:

The bst capacitor is charged to 3v only

what can be the problem?