DRA821U: Passive cooling query

Hi Samuel.

When you mean passive cooling are you looking at Heat sinks/Fans? Or Cooling using Frequency scaling?

Best Regards,
Keerthy

Hi Keerthy,

I am referring to the heat-sinks without the use of fans.

Cheers,

Sam

Samuel,

A colleague was able to help me with this:

This is the heatsink used on TDA4VM (27x27mm) EVM  It is adhesive, so can fit on DRA821 (assuming there is room around the 17x17mm device).

https://www.digikey.com/en/products/detail/aavid-thermal-division-of-boyd-corporation/374424B00035G/506640?s=N4IgTCBcDaIMwHYAsSxIEIAZtwKwHEQBdAXyA

A similar but smaller heatsink (23mm x 23mm) is linked below

https://www.digikey.com/en/products/detail/aavid-thermal-division-of-boyd-corporation/374124B00035G/506638

 Kevin Lavery

Hi Kevin,

Thank you for the response! Are you able to answer the following three questions?

Samuel Morris said:

• Are there any precautions for mounting the cooling fin (glue/fasteners)
• Are there any application notes for this?
• Is the metal can on the top of the MPU connected to anything, or is it floating?

Many thanks,

Sam