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TPS3899: V_HYS on datasheet

Shunsuke Nagata
Genius 12230 points
Part Number: TPS3899

Hi,

TPS3899 datasheet shows VIT- = 2.93V and VIT- + VHVS = 3.08V in chapter 9.2.2.

It explains the typical VHVS is 25.5mV. Then VIT- + VHVS should be 2.93 + 0.0255 = 2.956 and the 3.08V should be incorrect. The characteristics for VHVS is 5%(typ). I guess 2.93 + (2.93*0.05) = 3.077V ≒ 3.08V.

Is the information of the 25.5mV incorrect?

Regards,
Nagata.

  • 0
    TI__Mastermind 27355 points

    Hi Nagata-san,

    There should have been more clarification in the paragraph.  The 25.5mV hysteresis is from the 0.505V threshold voltage for the adjustable version.  With the resistor divider, 0.505V translate to 2.93V at the monitored voltage rail.  Therefore, the positive threshold voltage is 0.505V * (1+0.05) = 530.5mV at the SENSE pin or 3.08V at the monitored rail voltage.  I hope this answers your question.

    Ben

  • 0 in reply to Ben C
    TI__Mastermind 27355 points

    Hi Nagata-san,

    Just following up with you regarding your question about TPS3899.  If there are no further questions, please close the thread by clicking on "resolved".  Thanks!

    Ben