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LT8390 TG1 mosfet issue

Category: Hardware
Product Number: LT8390

Hello!

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

zooming:

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?

Top Replies

  • FormerMember
    FormerMember
Jun 20, 2022 in reply to gest +1 suggested

Try getting a demoboard for the LT8390-1 and try converting it to your design. It can help you debug your problem. If the simulation is working as intended and there are no cold solders and you have the…

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  • FormerMember
    0 FormerMember
on Jun 16, 2022 4:12 AM

Hi,

Have you tried checking/simulating your design in LTSpice? Please check your converter for possible cold solders and double check your circuit connection.

Regards,

Jhun

  • All of these issues are checked and the problem still the same. Any other problem that can cause this?

    Also changing the bst capacitance doesnt solve the problem.

  • FormerMember
    0 FormerMember on Jun 19, 2022 7:52 PM in reply to gest

    Are you using the demoboard or this is your self designed PCB?

    Regards,

    Jhun

  • is self designed, triying to follow the demo board.

    regards.

  • FormerMember
    0 FormerMember on Jun 20, 2022 10:27 PM in reply to gest

    Try getting a demoboard for the LT8390-1 and try converting it to your design. It can help you debug your problem. If the simulation is working as intended and there are no cold solders and you have the right components, it might be a PCB problem.

    Have you tried changing your MOSFETs/IC to check for failure?

    Regards,

    Jhun

  • Reply
    • FormerMember
      0 FormerMember
    on Jun 20, 2022 10:27 PM in reply to gest

    Try getting a demoboard for the LT8390-1 and try converting it to your design. It can help you debug your problem. If the simulation is working as intended and there are no cold solders and you have the right components, it might be a PCB problem.

    Have you tried changing your MOSFETs/IC to check for failure?

    Regards,

    Jhun

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