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TPS65988: TPS65988 : How to calculate Peak current and relationship

Eric Hung
Prodigy 250 points
Part Number: TPS65988

OCP 1A
Peak cueernt 100%
Ch1 (yellow), VBUS
Ch2 (blue), GPIO OCP evnet
Ch4 (green), current

OCP event in 1.0A , thru DC loader setting

  • 0
    Prodigy 250 points

    OCP 1A
    Peak cueernt 150%
    Ch1 (yellow), VBUS
    Ch2 (blue), GPIO OCP evnet
    Ch4 (green), current

    OCP event in 1.9A

  • 0
    Prodigy 250 points

    First picture, OCP Current 1A. Peak Crrent 100%, OCP event in 1.0A 

    Second picture, OCP Current 1A. Peak Crrent 150%, OCP event in 1.9A 

    1. What is Peak Crrent relationship

    2.How should I calculate a reasonable Peak Current?

    3. The third Event of Second picture, VBUS has been closed, Why GPIO has no notifications

    Please help suggest
    Thank you

    Eric Hung

  • 0 in reply to Eric Hung
    TI__Expert 3575 points

    Hi Eric,

    1. If you set the FW OCP to 1A 100%, the current will have a soft short protection ranging from 1.140 to 1.393 A. However, if you set the FW OCP to 1A 150% the current will range from 1.62A to 1.98A. Any current outside these ranges for more than 640us will trip the FW current protection

    2. The max current peak for FW protect is the continuous current above threshold for more than 640us.

    3. I am unsure of your test conditions and why would the GPIO would not communicate the OCP. I would ask you to go to the following link for more information with regards our power path protection. http://www.ti.com/lit/pdf/slva994  

    Regards,

    Francisco Lauzurique