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TPS53353 / max current setting

Pao Wu
Intellectual 920 points
Other Parts Discussed in Thread: TPS53353

“TPS53353” max capacity is 20A, what’s the OCP max ratting?? could support 25 OCP?? or more ??

 

No recommand data in datasheet.

 

Thank you.

  • 0
    TI__Guru**** 191445 points

    It is not just a simple specification.  The current limit is externally set and will depend on the application.  See section 7.3.6 of the datasheet for details.  Section 8.2.1 shows an example circuit with the current limit set to 26 A.  Equation 12 of step 6 in section 8.2.1.2 shows the detailed calculation for that example.  You can follow those steps to set the current limit for your particular design. 

  • 0 in reply to JohnTucker
    Intellectual 920 points
    Thank you for your reply.

    Because It haven't absoluted maximum curent rating in datasheet.
    I need to provide maximum value to my customer.

    Please help to check Figure 27. Safe Operating Area.
    Is it not safe during 20~26A??

    Thank you for your great support.
  • 0 in reply to Pao Wu
    TI__Guru**** 191445 points

    The SOA is not measured above the rated output current of 20 A. Theoretically you could extend the lines further down at the same slope.  For example the red natural convection line would be approximately 22 A at 70 C.

    For the maximum current limit, you would have to solve the datasheet equations 1 and 2 for the customers worst case condition to calculate it.