• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 32 subscribers
  • Views 481 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.

DS90C3202 Temperature Capacity

hisakichi kobayashi
Intellectual 950 points
Other Parts Discussed in Thread: DS90C3202

Hi all

There are the following questions in "Absolute Maximum Ratings" table of DS90C3202 data sheet.
1. "Package Derating" What is meant?
2. Although theta(ja) is not indicated, what value is it?
3. Although written as "Maximum Package Power Dissipation Capacity at 25C"=1.4W,
   Worse Case(max) of "Figure 6." =550mA and it is set to 3.3Vx0.55A=1.815W,
   Isn't "Maximum Package Power Dissipation Capacity" exceeded?

best regards

Hisa Kobayashi

  • 0
    TI__Guru* 93670 points

    Kobayashi-San,

    I apologize for the delay.  

    Theta JA is listed indirectly under package derating. It is 25.6mW/Deg C above + 25 Deg C.

    So if the device is drawing 200mA at 3.3V then P = .66W/.0256 = 25.7 Deg C rise above ambient.

    This is equivalent to 1/25.6mW = 39c/W for a typical Theta Ja.

    Regards,,nasser

  • 0 in reply to Nasser Mohammadi
    Intellectual 950 points

    Hi Mr. nasser.

    Thank you for your reply.
    I am understanding of "Package derating" and calculation of theta(ja) was completed.
    Thank you.

    Regards.
    Hisa Kobayashi.