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Could you tell me about TPS54425?

Pokkun
Genius 4695 points
Other Parts Discussed in Thread: TPS54425

Hello.
My customer is currently in using TPS54425,now.
I have gotten a question about this product .

So , I have a question about TPS54425.

＜Question＞

Please tell me about the following .

・Θja
・POWER RATING：Ta=25℃
・POWER RATING：Ta=85℃

Could you help us?

Best Regards,

Masumi Sekiguchi

  • 0
    TI__Guru**** 191445 points

    The thermal metrics are listed in the datasheet on page 2. The theta j-a is for a JEDEC standard coupon and is really for comparison purposes only. The actual power dissipation rating will depend greatly on your particular PCB design. I would suggest you use the Webtherm simulator inside of webench to estimate your power dissipation limits relative to your available copper area.  Based on the EVM design, webench indicates a 40 deg C temperature rise at full 4 A output.  So you should get very close to full output at 85 C ambient (125 C junction temperature).