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TPS65982: Peak current setting for each PDOs

Takashi Onawa
Genius 13200 points
Part Number: TPS65982

Hi team,

According to "Universal Serial Bus Power Delivery Specification Revision", 2.0, V1.2, each PDOs can have Peak current setting in bit21:22 and the settings are classified by Peak current and its duty as below.

 

However, it's unclear how the options displayed on App config tool below corresponds to the above table.
Could you clarify which ”%"option we should select to set this peak current setting to "01b"?

Regards,

Takashi Onawa

  • 0
    TI__Mastermind 36756 points
    Hi Onawa-san,

    You should select the 130% option for the peak current setting of 01b.

    Thank you,
    Eric
  • 0 in reply to Eric Beljaars
    TI__Genius 13200 points

    Hi Eric-san,

    OK, I understood which setting I should select to set 01b.

    But...

    According to the latest PD specification(v1.3),  it looks that each peak current settings were changed as below.

    Peak Current　　Table6-7 (Bits 21…20)

    00b → 100% IOC

    01b → 150% IOC

    10b → 200% IOC

    11b → 200% IOC

    1. Has this point already fixed in the latest TPS6598X FW?
    2. Could you tell me whether there is any issue in PD compliance test  or not? (if it has not supported yet)
    3. If we set higher peak current such as 200% IOC, it seems OCP trip point will move to higher. In this setting, we are afraid that Source can not detect Sink's over current condition between IOC and 200% IOC though, do you have any ideas to detect Sink's over current condition in such case? 

     

    Regards,

    Takashi Onawa

  • 0 in reply to Takashi Onawa
    TI__Guru 50120 points

    Hi Onawa-san,

    The FW allows four different peak current configuration: 100% ,130% ,150%, 200%. These are hard set limits that are imposed onto the device. Unfortunately, there is no current  FW solution to implement the peak current profiles that you see in the USB PD Spec document. 

    For example: Assuming a nominal current of 3A, if you set your peak current  to 150% by selecting it to10b, the maximum current before a fault occurs is 4.5A. There will not be a change of peak current profile as you see in the picture you referenced ( 200%,150%,125%). 

    With that said, I just wanted to clarify that the TPS65982 have passed compliance testing for the current platform.

    Regards,

    Jimmy Hua  

  • 0 in reply to Jimmy Hua
    TI__Genius 13200 points
    Hi Hua-san,

    Thanks for your comment.

    I think it might be a little bit early to allow to use the peak current feature. OK, I will recommend them not to use this feature for interoperability at this point. Sink device should work even if source is not support this feature as well.

    Regards,
    Takashi Onawa