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TPS53688: Max allowed current mentioned on product page

Ujjwal Tripathi
Prodigy 20 points
Part Number: TPS53688
Other Parts Discussed in Thread: CSD95430, , TPS536C7

Tool/software:

Hi,

What is the limitation of maximum current specified as 765A for TPS53688 controller. As per my understanding if we use 8xdual phases(CSD95430) of 100A each. Can we cross 800A? 
What is the limitation in terms of current?

  • 0
    TI__Intellectual 2150 points

    Hi Uijwal,

    The 765A number from our website is the max current of Vr13.HC so that number is wrong for the max current. I am not sure why the VR13.HC spec is listed. I will work with our team to get that fixed.

    The max current for TPS53688 is 560A. 70A per phase is the max current per phase and that is limited by the ADC range. You could use 8x Dual phases but you will not have any current accuracy above 70A. That being said, the CSD95430 only supports 90A peak current for less than 500ms. 

    The CSD95430 ties 2 phases together at their respective CSP. So the current telemetry reported in the 53688 will be off by a factor of 2. You could avoid this by moving to our most recent generation of controllers, where we have designed in functionality to account for phase doubling.

    Best Regards,

    Nash

  • 0 in reply to Nash Boyd
    Prodigy 20 points

    Hi Nash,

    Thanks for details. If we use TPS536C7+10 blocks of dual CSD95430 stages, can we plan to generate 0.8V/800A assuming 40A per CSD95430 block?

    As per TPS536C7 product page max allowed current is 400A, does it mean if we use above configuration we will not get current accuracy beyond 40A per CSD95430 dual block?

    In this case what would happen if it crosses 40A, will the output become unstable, since CSP signal will saturate?

    Please share your comments and thoughts on the same.

    Regards,

    Ujjwal

  • 0 in reply to Ujjwal Tripathi
    TI__Intellectual 2150 points

    Hi Ujjwal,

    C7 has the same CSP range as 688. Since the powerstages are only rated for anything >40A for a duration of less than 500ms, the transient current typically happens fast enough that the ADC of the CSP will not saturate before over current protections are tripped. If there were a case where the protections weren't tripped and the ADC's did saturate, the loop probably wouldn't become unstable but output accuracy would start to be impacted, especially if using DCLL. 

    If you email vr@list.ti.com, you might be able to get access to more information and more detailed datasheets that will hopefully be more helpful than what you are finding on the product pages.

    Let me know if you have more questions.

    Best Regards,

    Nash