• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 32 subscribers
  • Views 234 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TPS65987EVM: Variable Sink PDO

Mitchell Spears
Prodigy 575 points

Part Number: TPS65987EVM

Hi Interface Team! 

I have received a question from a customer working with the TPS65987EVM in sink mode. 

This is from the customer: 

I have used the TI Application Configuration Tool to create a project with 4 fixed sink PDOs.

The binary created from this project works, and I can successfully negotiate all of the contracts.

However, I tried to reduce the number of PDOs by creating a variable sink PDO of up to 20V at 4A, and this failed to negotiate anything over 5V at 3A.

What is the purpose of the variable sink, and can I use a single variable sink to test all 4 PD contracts?

Let me know if you need any more information!

Thank you, 

Mitchell

  • 0
    TI__Expert 7700 points

    Hi Mitchell,

    As per spec, Variable Supply - A very poorly regulated power supply that is not a Battery. 

    However, I tried to reduce the number of PDOs by creating a variable sink PDO of up to 20V at 4A, and this failed to negotiate anything over 5V at 3A.

    >>>Did the source advertise matching Variable PDO and the sink failed to establish contract? 

    What is the purpose of the variable sink, 

    >>> If the Sink can work with a poorly regulated source (range of source supply, say 5-8 V) it can configure itself as Variable Sink. 

    and can I use a single variable sink to test all 4 PD contracts?


    >>> I did not get your question. Could you explain the use case a bit? 

    Thanks

    Prajith