Smart High-Side Power Switch

Discussion in 'Power Electronics' started by ilginsarican, Jun 10, 2018.

  1. ilginsarican

    Thread Starter Member

    Jul 13, 2017
    37
    2
    Hi,
    I want to use high side power switch which is BTS50010-1TAD
    I saw that on datasheet but did not understand.
    What does dynamic undervotage capability mean?
    upload_2018-6-10_15-20-43.png
     
  2. OBW0549

    Distinguished Member

    Mar 2, 2015
    2,827
    2,501
    See Note 2 on page 14 of the data sheet; as I understand it, it means that Vs can drop to as low as 3.2 volts for up to 6 milliseconds (as during engine cranking). In other words, "dynamic undervoltage capability" refers to the ability of the part to tolerate a transient undervoltage condition.
     
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  3. ilginsarican

    Thread Starter Member

    Jul 13, 2017
    37
    2
    So if I operate the mosfet at 28V continuosly, it will break down?
     
  4. crutschow

    Expert

    Mar 14, 2008
    21,741
    6,268
    Since its maximum operating voltage is 28V it is marginal to operate at that voltage.
    Any transient above that could cause it to fail.
    You typically want a 25%-50% margin on voltage for good reliability.
     
  5. OBW0549

    Distinguished Member

    Mar 2, 2015
    2,827
    2,501
    Yes, it might-- although if you're concerned about what is the maximum voltage the part will stand, the correct part of the data sheet to be looking at is Section 4.1 on page 10, Absolute Maximum Ratings, not the Product Summary on page 2.
     
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