TPD12S016: Thermal information - Junction Temperature

Jaecheon Yoo

Part Number: TPD12S016
Other Parts Discussed in Thread: TDA4VM

Tool/software:

Hi experts

I can only see Operating free-air temperature in the datasheet.
Would you share min and max Junction temperature, TJ for this device?

Material Description (MPN)

Operating free-air temperature

RθJC(top) (°C/W)

Junction-to-case (top) thermal resistance

Junction temperature, TJ

min

Junction temperature, TJ

max

TPD12S016PWR (HDMI Companion Chip)

-40~85°C

26.5

HDMI output video shows somehow shifted like the image below.
We are debugging it where could make this symptom but before that I have question if HDMI TPD12S016PWR can make video output shifting to downside or not.

over 1 year ago

0 Chuck Branch over 1 year ago

TI__Mastermind 32791 points

Hi Jaechon,

This does not look like a signal integrity issue to me and that would be the only thing that the TPD12S016 would impact on an HDMI signal. You would fail to get a signal at all or it would occasionally drop out, so I think that this is likely an issue with the video scaler that is shifting the digital data up.

Regards,

Chuck

0 Jaecheon Yoo over 1 year ago in reply to Chuck Branch

Intellectual 746 points

OK, could you let me know my junction temperature question BTW?

0 Chuck Branch over 1 year ago in reply to Jaecheon Yoo

TI__Mastermind 32791 points

Yaecheon,

Here is the Temperature data from the datasheet.

These are max numbers, we do not have min numbers available for these parts.

Regards,

Chuck

0 Jaecheon Yoo over 1 year ago in reply to Chuck Branch

Intellectual 746 points

Thanks, then I only need to know max numbers which doesn't seem to be mentioned in the datasheet.

0 Chuck Branch over 1 year ago in reply to Jaecheon Yoo

TI__Mastermind 32791 points

Jaecheon,

I understand. The datasheet numbers that I provided are the max numbers.

Regards,

Chuck

0 Jaecheon Yoo over 1 year ago in reply to Chuck Branch

Intellectual 746 points

Chuck Branch said:
Here is the Temperature data from the datasheet.

The captured image that you provided shows only C/W factors. Unfortunately I don't see max junction temperature for the device.
would you let me know the max junction temperature of the device?

0 Chuck Branch over 1 year ago in reply to Jaecheon Yoo

TI__Mastermind 32791 points

Jaecheon,

Here is an application note on how to utilize the numbers provided to model system temperature.

https://www.ti.com/lit/an/spra953d/spra953d.pdf

Regards,

Chuck

0 Jaecheon Yoo over 1 year ago in reply to Chuck Branch

Intellectual 746 points

Chuck

Most of TI devices provide the operating junction temperature range on their datasheet like the examples below.

TDA4VM series

I am curious why the junction factor values are disclosed in TPD12S016PWR datasheet, but the junction temperature range is not. If you have any knowledge about this, could you please explain it in more detail?

BTW, TPD12S016PWR datasheet shows Thermal shutdown temperature as 140C. I don't know how and where the device detects 140C, but may I consider the device has no problem until its case temperature reaches 140C?

0 Eric Hartigan over 1 year ago in reply to Jaecheon Yoo

TI__Genius 11385 points

Hi Jaecheon,

Chuck is out the rest of this week, so I will do my best to help out.

A TSHUT characteristic such as the one you included above is usually triggered by an on-die thermal diode that has been characterized to correlate V_f with temperature. If there is significant power losses within the device, we can assume Tj will be greater than the case temperature, so you would see thermal shutdown before case temperature can reach 140C. The part then resumes normal behavior when the die temperature reduces by 12C.

Regards,
Eric

+1 Chuck Branch over 1 year ago in reply to Jaecheon Yoo

TI__Mastermind 32791 points

Jaecheon,

The device has an internal temperature sensor that will disable the device if the IC reaches a temperature of 140C, so the case temperature will be higher. This is intended as a final protection against thermal runaway.

Regards,

Chuck

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TPD12S016: Thermal information - Junction Temperature