TPS62876-Q1: TPS62876B1QWRZVRQ1

Damian Kaluzny

Prodigy 55 points

Part Number: TPS62876-Q1

Tool/software:

Hello

We need to have power dissipation table like of example below.

I want to calculate Tj based on the measured Tc.

Our application below.

These calculations are necessary to verify the simulation.

Could you help us?

6 months ago

0 Excel Regidor 6 months ago

TI__Mastermind 36981 points

Hello Damian,

Thanks for reaching out to us.

We don't have a detailed thermal information as you have shown in your post. Instead, you can refer to the formula and thermal data below to calculate for the Tj temperature using the measured Tcase.

I also indicate the link of the app note below that the explain why those parameters in the formula needs to be used in determining the junction temperature.

I hope I was able to address your queries.

Formula:

App note link: https://www.ti.com/lit/an/spra953d/spra953d.pdf?ts=1742506712328

Best regards,

Excel

0 Excel Regidor 5 months ago in reply to Excel Regidor

TI__Mastermind 36981 points

Hi Damian,

Just a gentle reminder. Do you have further queries? If not, it will be highly appreciated if you can close the thread.

Thabk you.

Best regards,

Excel

0 Damian Kaluzny 5 months ago in reply to Excel Regidor

Prodigy 55 points

In the given formula you use Ψ-JT, but we have heatsink (pedestal). Please refer to screenshot.

Best regards

0 Excel Regidor 5 months ago in reply to Damian Kaluzny

TI__Mastermind 36981 points

Hello Damian,

Thanks for the clarifications. I overlooked the heatsink on top of the device. Anyway, I will come back to you latest end of next week, and I hope the schedule is fine with you.

Best regards,

Excel

+1 Excel Regidor 5 months ago in reply to Excel Regidor

TI__Mastermind 36981 points

Hi Damian,

Thanks for your patience.

I checked with our thermal expert and the suggestion is to use the Rth(theta-case) to calculate for the junction temperature with a given Tcase. And unfortunately, we cannot provide the sample table you shared because it's PCB and application specific.

Best regards,

Excel

0 Excel Regidor 5 months ago in reply to Excel Regidor

TI__Mastermind 36981 points

Hello Damian,

Just a gentle reminder.

Do you still have further queries?

Best regards,

Excel

0 Excel Regidor 4 months ago in reply to Excel Regidor

TI__Mastermind 36981 points

Hi Damian,

I'm closing the thread now. You can re-open by simply adding a comment.

Best regards,

Excel

0 Damian Kaluzny 4 months ago in reply to Excel Regidor

Prodigy 55 points

Thanks for the suggestion, but it doesn't solve my problem. I've closed the topic as a "solved" for your better statistics. I don't have time to explain this topic any further.
Best regards

Power management

Power management forum

TPS62876-Q1: TPS62876B1QWRZVRQ1