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DRV8312: DRV8312 theta Jc

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Replies: 2

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Part Number: DRV8312

The data sheet list two values for Theta Jc, one in paragraph 7.5 in the "Thermal Information" table and a different value in paragraph 7.6 in the "Dissipation Ratings" table.  Why are these values different?  What is the intended use case for these two values.  We are performing thermal simulation and are wondering which to use.  The values are quite different , 5X.  Perhaps describing how the two values are measured would allow me to choose the best value to use for my situation.

Thanks

Keith K.

  • Hi Keith,

    We will have to research this. The revision history shows the standard Thermal information was added in October 2013.

    The other information was in the original datasheet, but how the values were measured is unknown.

    I hope to have an answer by mid next week.

    Rick Duncan
    Motor Applications Team

  • In reply to Rick Duncan:

    Hi Keith,

    Sorry for the delay.

    I have not been able to definitively identify the why there is a difference. The Package Heat Dissipation Ratings may have been measured on the EVM, which has different thermal properties than the standard board used for section 6.4.

    The thermal information in section 6.4 should be used as it is consistent across all devices.

    Rick Duncan
    Motor Applications Team

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