• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 62 subscribers
  • Views 161 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

LM5108: Gate driver for non-insulated synchronous booster circuit

Kaji@PAN
Mastermind 7205 points
Part Number: LM5108

Hi,

I am considering creating a non-insulated synchronous booster circuit.
So I would like to ask you a question.
Could I use the LM5108 half-bridge gate driver as a gate driver for a synchronous booster circuit?
If so, are there any considerations?
Please let me know if there is a reference design for use in a non-insulated booster circuit.

Best regards,

  • 0
    TI__Mastermind 21375 points

    Kaji,

    Thank you for the interest in the LM5108. The LM5108 is suitable for a synchronous boost as long as the IC voltage ratings are within the recommended operating range(s). The power train for a sync boost is virtually the same as a sync buck, the difference being that you are controlling the low side power device duty cycle to control the input to output voltage regulation.

    The considerations will be similar to a sync buck power train, in that with synchronous switching you need to pay attention to the dead times in the power device Vgs waveforms. Also you should make provisions to have some gate resistance on the MOSFET gate to allow adjusting of the switching times to address efficiency and switch node voltage spikes and ringing.

    I did not find a simple single phase reference design for a non isolated sync boost, but I did find a buck- boost design utilizing 100V half bridge drivers. Maybe this will be helpful in your case. The link is below.

    https://www.ti.com/tool/PMP21529

    Confirm if this addresses your questions, or you can ask additional questions on this thread.

    Regards,