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CDCLVC1310: about CDCLVC1310 thermal resistor

Part Number: CDCLVC1310

hI dear supporting team,

customer find in their application, CDCLVC1310 top case temperature is 103degree,  when calculatiing the junction temp, I think they should use 34.1degree/W θJCtop which cause 113degree Tj) ,while  there is another spec of 0.9degree/w of ψJT, what's the difference btw these two?

and do we have recommended highest Tj ? could we calculate in this way, assume max power consumption is 0.3W, then recommended Tjmax=85+0.3*41.7=97.51 degree?

if so, then will above 113 Tj case cause performance degradation? and will it cause higher failure rate?  do you have Tj vs MTBF curve on this chip?

tks a lot!

  • Typically one would use ψJT to estimate the junction temperature, rather than θJC. Please review this app note for more information on how to properly use the thermal parameters: www.ti.com/.../spra953c.pdf

    We don't have a highest recommended Tj, only max recommended ambient temperature. If the ambient temp has not exceeded 85 °C, you are still operating within the recommended operating conditions. There should be no performance degradation, however check to make sure that the junction does not exceed 125 °C.

    I'll have to search for a Tj vs. MTBF curve. If we have it I can share it to you directly offline. Please send an email to clock_support@list.ti.com.

    Kind regards,
    Lane
  • hi Lane,
    thank you for the reply!
    so if using ψJT , the junction temp is only 103.27 degree, so is the d/s performance still guaranteed? since 125 Tj is the absolute rating which only guarantee the no damage temp. tks!
  • Yes, I would expect the device to operate with full datasheet guaranteed performance here.

    Kind regards,
    Lane