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LM76003: Short-Circuit duty confirm

Allen Lu
Intellectual 1870 points
Part Number: LM76003

Hi team:

 can you help to check the duty of LM76003 when the device under Short-Circuit  mode?

 target to evaluate the thermal performance. tks again.

  • 0
    TI__Guru 71445 points

    Hi Allen,

    Thank you for posting.  The short circuit protection is implemented by the current limit (up to 6.8A, see EC table below)

    And it is a dc level.  Considering the propagation delays, which can be up to 100ns, then you can get Vin/Lmag*100ns on top of 6.8A peak.

    The worst case effective duty would be:

    D =( 6.8A *Lmag/Vin +100ns) * Fsw

    Were Fsw is the switching frequency. Lmag is the inductor and Vin is the input voltage. 

    Hope this clarifies.

    Thanks,

    Youhao