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TMS320C5517: Thermal design guideline

Shinya Sawamoto
Expert 5285 points
Part Number: TMS320C5517

Hello team,

Let me ask a couple of questions regarding thermal design guideline.

1) Is there a recommended Tj(max) range for this device? (We can find 150C max as Tstg but not for operation ratings description on the datasheet.)

2) We should estimate the Tj by using Psijt. From the parameter on the datasheet, we can treat almost same by measuring on the case top. (Psijt=0.09, with no air flow) Is that a correct idea for this device? (Let me double-check it, just in case.)

Thanks in advance.
S.Sawamoto

  • +1
    TI__Guru**** 196736 points

    Hi,

    The operating temperature of this device is -40~85 ºC. 

    The junction temperature is calculated from the ambient using the following equation:

    Tj(max) = Ta + Rth(j-a) * P

    where Rth(j-a) is the thermal resistance of "junction-to-ambient" which is in Table 5.5 of device datasheet: 33.4ºC/W

    P is the power dissipation

    For power consumption, please read the datasheet and this application note:

    https://www.ti.com/lit/an/sprabn1/sprabn1.pdf