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TPA3255: Specification of Roc and Ioc(latched) for TPA3255

yoshiki hasebe
Mastermind 6385 points
Part Number: TPA3255

Dear Sirs,

My customer asked us about specification of Roc and Ioc(latched) for TPA3255

The TPA3255 data sheet has the following these descriptions.

Does Rocp here mean min value and max value?
In the data sheet, Ioc is also described as a typical value.
This is because Test Condition is described in min and max.
If this is correct, the min value of Rocp is 47kΩ and the maximum value is 64kΩ.
Is this correct?

If they are different, please tell me the min and max of Rocp and Ioc.

In addition, there is the following description at the bottom of the data sheet page 18.

OC_ADJ values outside specified value range for either CB3C or latched OC operation will result in minimum OC threshold.

In addition, there is the following description at the bottom of the data sheet.
OC_ADJ values outside specified value range for either CB3C or latched OC operation will result in minimum OC threshold.
This is understood to be the minimum OC threshold for values outside the range of 47kΩ to 64kΩ.
Is this correct?

Also I have one more question.

In Figure 27 on page 18 of the data sheet, Ioc appears to be a linear inversely proportional line to the change in Roc in the figure of OC_ADJ Resistor Value Example.

However, when I create a graph in Table 3 on page 19, it looks like a straight line.
Can this change be considered as a straight line (or linear approximation?) as shown in the data sheet?

Best Regards,

Y.Hasebe

  • 0
    TI__Mastermind 19080 points

    Hi Yoshiki-san,

    I got your point. Need some time to check this information. Will update with you later.

    Thanks!

    Regards,

    Hao

  • 0 in reply to Sam(MPAA) Zhang
    Mastermind 6385 points

    Hello Hao-san,

    Thank you for your reply.

    I'm waiting for your reply.

    Best Regards,

    Y.Hasebe

  • 0 in reply to yoshiki hasebe
    Mastermind 6385 points

    Hello Hao-san,

    My customer asked me again.

    When can you reply me with the answers to the above questions?

    Please let me know it.

    Best Regards,

    Y.Hasebe

  • 0 in reply to yoshiki hasebe
    TI__Mastermind 19080 points

    Hi Yoshiki-san,

    I got the feedback on the upper and lower limits. The limits are exactly the values listed on the table.

    For other questions, we recommend to only use the values listed on the table, please just follow the spec. We can't guarantee what would happen if go out of the spec...

    Thanks!

    Regards,

    Hao

  • 0 in reply to Sam(MPAA) Zhang
    Mastermind 6385 points

    Hello Hao-san,

    Thank you for your reply.
    I almost understood your reply to my questions.
    But some questions are unknown, so please me know again.

    Q1:
    Does Rocp here mean min value and max value?

    ⇒I understand your below answer.

    I got the feedback on the upper and lower limits.
    　The limits are exactly the values listed on the table.

    Q2:
    In addition, there is the following description at the bottom of the data sheet.OC_ADJ values outside specified value range for either CB3C or latched OC operation will result in minimum OC threshold.
    This is understood to be the minimum OC threshold for values outside the range of 47kΩ to 64kΩ.
    Is this correct?

    ⇒I understand that it is more correct than the above your answer.
    In other words, it must be used in the range of 47kΩ-64kΩ.


    Q3:

    However, when I create a graph in Table 3 on page 19, it looks like a straight line.
    Can this change be considered as a straight line (or linear approximation?) as shown in the data sheet?

    ⇒I don't get an answer to this question.
    　Please let me know your answer to this question.

    Best Regards,
    Y.Hasebe

  • 0 in reply to yoshiki hasebe
    TI__Mastermind 19080 points

    Hi Yoshiki-san,

    In datasheet, TI only gives four OC setting values for each kind of protection behavior. Please select one of the given values for customer's application.

    We don't have the accurate relationship between resistance and OC limit point, and any resistance value out of the 4 discrete values are not guaranteed and not recommended to use.

    Thanks!

    Regards,

    Hao

  • 0 in reply to Sam(MPAA) Zhang
    Mastermind 6385 points

    Hello Hao-san,

    Thank you for your reply.

    I understand your comments.

    I will explain them to my customer.

    Best Regards,

    Y.Hasebe