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TPS65987D: About operation at Source 5V/3A and Sink 5V/0.9A capabilities

Hide
Guru 21045 points
Part Number: TPS65987D
Other Parts Discussed in Thread: USB-C-PD-DUO-EVM, TPS65981, TIDA-050012, TPS65987

Hi Team,

 

We are evaluating TPS65987DDH at the following conditions(Case1 and Case2).

Behavior of Case1 and Case2 are different at S200(only a 5V sink capability offering) or star up timing.

(If S201/2/3, Case1 and Case2 are same behavior.)

We would like to know this cause.

 

-------------

<Case1>

TPS65987EVM(Source)* => USB-C-PD-DUO-EVM Sink Board* => Dummy Load (Around 1.6A)

*EVMs are default setting.

 

Behavior:

-If S200/1/2/3 and start up timing, TPS65987EVM can supply VBUS=5V to EVM sink Board at Dummy Load is 1.6A

 

<Case2>

Our develop source board** => USB-C-PD-DUO-EVM Sink Board* => Dummy Load (Around 1.6A)

*EVM are default setting.

**Raw view value setting of TIDA-050012 source board of TPS65981_2_6_7_8 Application Customization 6.1.

 

Behavior:

-If S200 or start up timing, our develop source board can’t supply VBUS=5V(so VBSU LED is blinking on sink board) at Dummy Load is 1.6A

However, if Dummy Load is OFF(From 1.6A to 0A), can supply VBUS=5V(VBUS LED is lighting on sink board).

 

-If S201/2/3, TPS65987EVM can supply VBUS=5V to EVM sink Board at Dummy Load is 1.6A

 

Then, source and sink capabilities of Case1 and Case2 are the following conditions(same conditions).

Source: 5V/3A

Sink:

S200 and start up timing        5V/0.9A

S201                                        5V/3A, 9V/3A

S202                                        5V/3A, 9V/3A, 15V/3A

S203                                        5V/3A, 9V/3A, 15V/3A,20V/3A

-------------

 

I have three questions.

 

[Q1]

I guess that If S200 is pushed on EVM sink board, sink capability is 5V/0.9A only (so I can’t set 1.5A and 3A and other current.)

Because, I read sink capability 5V/0.9A only.

Is my understanding correct?

 

[Q2]

I guess that source and sink capability are different at case1, so EVM Source board is limited to 5V/0.9A.

However, EVM Source board can supply 5V/1.6A(more than 3A) at case1.

(source capability is 5V/3A and sink capability is 5V/0.9A(S200 is pushed))

Is this the correct operation?

 

[Q3]

Our develop Source board can’t supply 5V/1.6A at case2.

(source capability is 5V/3A and sink capability is 5V/0.9A(S200 is pushed))

Therefore, I would to know why the behavior is different from case1.

Could you please let us know if you have any concern?

 

Regards,

Hide

  • 0
    TI__Mastermind 30025 points

    Dear Hide,

    I will be in the lab tomorrow to test this out.

    Thanks,

    Mike Emanuel

  • 0 in reply to Michael Emanuel35
    Guru 21045 points

    Hi Mike-san,

    Thank you for  kind support.

    I’m looking forward to hearing from you.

    Regards,

    Hide

  • 0 in reply to Hide
    TI__Mastermind 30025 points

    Dear Hide,

    It looks like you need to modify the Source Board. Please modify the operating current as shown below when programming the sink board using the default TPS65987DDH Sink Board project.

    I tested 5 V at sink with 3 A.

    Thanks,

    Mike Emanuel

    Please click "Resolved" if this answered your question.

  • 0 in reply to Michael Emanuel35
    Guru 21045 points

    Mike-san,

     

    Thank you for kind support.

     

    --------

    [Q1]

    I guess that if source and sink capability are different, source board can’t supply target power.

    For example;

    -If source capability is 5V/3A, sink capability is 5V/0.9A, source board supply 5V/0.9A.

    -If source capability is 5V/3A, sink capability is 5V/3.0A, source board supply 5V/3.0A.

     

    Is my understanding correct?

    --------

     

    [Q2]

    I understand that your test condition is the following and S200 is pushed on EVM sink board.

    At the result, TPS65987EVM(Source) can’t supply 5V/3A so can supply 5V/0.9A.

    But, if you change sink capability (5V/0.9A=> 5V/3A), TPS65987EVM(Source) can supply 5V/3A.

    Is my understanding correct?

     

    <Case1>

    TPS65987EVM(Source)* => USB-C-PD-DUO-EVM Sink Board* => Dummy Load (Around 1.6A)

    *EVMs are default setting.

    --------

     

    [Q3]

    Thank you for your comment.

    >Please modify the operating current as shown below when programming the sink board using the default TPS65987DDH Sink Board project.

     

    I understand that I have to modify the sink capability (5V/0.9A => 5V/3A).

    Is my understanding correct?

     

    Sink:S200 and start up timing        5V/0.9A => 5V/3A (modify)

    S201                                        5V/3A, 9V/3A

    S202                                        5V/3A, 9V/3A, 15V/3A

    S203                                        5V/3A, 9V/3A, 15V/3A,20V/3A

    --------

     

    Regards,

    Hide

  • 0 in reply to Hide
    TI__Mastermind 30025 points

    Dear Hide,

    Q1: The source board will provide the highest power capability for each voltage that both the sink and the source share. So if the source is 5 V/3 A and the sink is 5 V/0.9 A, only 0.9 A will be provided.

    Q2: Changing the sink capability will allow for 3 A current.

    Q3: Make the following change to realize this change.

    Thanks,

    Mike Emanuel

    Please click "Resolved" if this solved your issue.

  • 0 in reply to Michael Emanuel35
    Guru 21045 points

    Hi Mike-san,

    Thank you for always kind support.

    I greatly appreciate your cooperation.

    Regards,

    Hide

  • 0 in reply to Hide
    Guru 21045 points

    Hi Mike-san,

     

    Sorry for contacting you repeatedly.

    We are evaluating TPS65987 at the following conditions.

    I understand that if source capability is 5V/3A and sink capability is 5V/0.9A, source board supply 5V/0.9A.

    However, our evaluation result, source board can supply 5V/1.6A (more than 0.9A).

    Is this the correct behavior?

     

    <Case1>

    TPS65987EVM(Source)* => USB-C-PD-DUO-EVM Sink Board* => Dummy Load (Around 1.6A)

    *EVMs are default setting.

     

    <Sink capability>


     

     

    Regards,

    Hide

  • 0 in reply to Hide
    TI__Mastermind 30025 points

    Dear Hide,

    Your operating current range is from 0.9 A to 3.0 A so it can support 1.6 A. The selected operating current is indeed 0.9 A, but your maximum is up to 3.0 A.

    Thanks,

    Mike Emanuel

    Please click "Resolved" if this answered your question.

  • 0 in reply to Michael Emanuel35
    Guru 21045 points

    Hi Mike-san,

    I greatly appreciate your cooperation.

    Regards,

    Hide