• State Resolved
  • Locked Locked
  • Replies 4 replies
  • Subscribers 65 subscribers
  • Views 622 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Need information on thermal performance of TPS62120

Ajit Deshpande
Prodigy 50 points
Other Parts Discussed in Thread: TPS62120, TPS62122

Hi,

 We are evaluating TPS62120 High efficiency buck converter for our product which is designed for low power consumption.  Since datasheet does not specify any thermal related data or graph , need to know more about this. we are mainly interested to know the TPS thermal performance over operating range of -40 to 85 deg C and its effect on output efficiency if any.

Thanks,

Ajit

  • 0
    TI__Intellectual 2415 points
    Hi,

    efficiency over operating range -40 to 85°C you can find in Webench model of the TPS62120.
    What is the spec if the power supply?
    What is the target efficiency?

    Best regards

    Lubomir Fenic
  • 0 in reply to Lubomir
    Prodigy 50 points
    Thanks Fenic. The Power supply I/p range will vary between 7V to 9V. We are expecting efficiency more than 70% if input drops below 9V.
    Please share webench model as I am not able to access. If you have any analysis done on thermal performance better share the same.

    Regards,
    Ajit
  • 0 in reply to Ajit Deshpande
    TI__Guru*** 148130 points
    Hi Ajit,

    It's not clear what you need. The data sheet has the usual JEDEC thermal values on page 4. A real PCB will give better performance than JEDEC.

    There are also plenty of efficiency graphs in the D/S, so you can see what the efficiency is at your exact operating conditions.

    From these, you can compute the power loss, remove the inductor losses from this total, and multiple the result by the theta JA to get the temp rise in the IC (on a non-ideal JEDEC PCB). I think you will find that for such a low power IC, the temp rise is almost non-existent.

    The Webench model is always found on the product page: www.ti.com/.../slva494a.pdf

    If you want better thermal performance, there is the TPS62122 which comes in a SON package.
  • 0 in reply to Chris Glaser
    Prodigy 50 points
    Thanks Fenic.
    I will have a look at Webench model. Normally we will be operating TPS62120 with 9V input at ambient temperature. However I wanted to know if ambient increases to 85 deg C, will output of buck converter get impacted such as efficiency loss or quality of the output.
    since this was not clear from datasheet wanted to check with TI experts.
    Anyways thanks for your clarification.

    regards,
    Ajit