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LM5116 - the waveform in case of diode emulation mode

Hirotaka Matsumoto
Guru 27585 points
Other Parts Discussed in Thread: LM5116

Hi all,

Would you mind if we ask LM5116?
Please refer to an attachment file.
20160411_LM5116.pdf

Could you give us some advice?

Kind regards,

Hirotaka Matsumoto

  • 0
    TI__Guru 59001 points
    Hi
    If the SW node voltage does not fall down below DEMB voltage during 'HO-off to LO-on' dead-time, the LM5116 turn on LO driver, but the LO driver will turn off immediately. If you don't like to see this behavior, please use smaller gate charge / smaller Coss MOSFET.
    Regards,
    EL
  • 0 in reply to EricLee
    Guru 27585 points

    Eric san

    Thank you for your prompt reply always.
    About <Question1>, we got it.
    We make our customer confirm your saying. 

    So, about <Question2>, we guess that it causes of resonance phenomenon by L(bonding wiring) and C(between drain and source of FET)
    Is our recognition correct?

    We appreciate for your help.

    Kind regards,

    Hirotaka Matsumoto

  • 0 in reply to Hirotaka Matsumoto
    TI__Guru 59001 points

    Hi

    It is always better to have stable DEMB voltage, but I don't think such a small ripple will cause serious problem.

    I am not sure which parasitic are resonating now. It might be caused by ground bouncing.

    Regards

    EL