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AM572x Power Concerns

Toni Ray (she-her)
Prodigy 590 points

Other Parts Discussed in Thread: AM5728

A customer is using TI AM5728 for a high-end signaling control system.  They are worried that some of their operating conditions could overheat the processor and would like to discuss.  Can you review the operating conditions below and make any recommendations?

 

Test Environment

-40C-70C  (4-6 hours)

85C (10min)

 

Tj=-40C-105C

Their power consumption is 4W

Junction to Free Air 11.1 C/W with no airflow

This will put them over 105 -- 11C/W * 4W= +44C which is over (70+44=104)

 

  • 0
    TI__Guru**** 393215 points
    Here is a document they may find useful: www.ti.com/.../tiduav2a.pdf It contains links to various related documents.
  • 0
    TI__Genius 13515 points

    Hi,

    Did the customer get 4W using power estimation spreadsheet?  Is that steady or peak power?  Sharing a scrubbed version of the PET would be helpful to know the customer was basing estimations using hot silicon, or nominal as well.

    Based on the thermal resistance above, it looks like the customer plans to run without a heatsink.  Likely they will need a heatsink at a minimum.  Will the system be located outdoors in a sealed enclosure?  One option in that scenario would be to engineer a thermal interface between the processor and enclosure.  Does the customer plan to do thermal simulations of their design before building a prototype?

    Regards,
    Mike