Design Con 2015
Breaking News
Comments
Newest First | Oldest First | Threaded View
annawood
User Rank
Freelancer
Heat Sink
annawood   7/1/2014 4:27:09 AM
NO RATINGS
This heat sink is made up of aluminum and the surface is black anodized, both of which make an excellent heat dissipation rate and insulating property, resulting in a better effect in heat dissipation.

The heat sink's thermal resistance is the most important parameter to choose heat sink.

Once the maximum safe junction temperature for the equipment (Tjmax) is known, the power is going to dissipate (Pd) and the maximum ambient temperature will work at (Tamb), thus the maximum total Rth (j-a) from this expression:

Rth (j-a) = (Tjmax - Tamb)/Pd

From the manufacturer's data, useful information, such as Rth (j-c) can be found, the junction-case thermal resistance of the power equipment itself. Then add the thermal resistance of the thermal compound and/or insulating washer and this will provide the total junction to heat sink resistance. Subtract this from the maximum Rth (j-a) figure, and the maximum allowable heat sink resistance will be achieved. Then select a heat sink which will provide no more than this value of thermal resistance.



Flash Poll
Top Comments of the Week
Like Us on Facebook
EE Times on Twitter
EE Times Twitter Feed

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
EE Life
Frankenstein's Fix, Teardowns, Sideshows, Design Contests, Reader Content & More
Max Maxfield

Book Review: Deadly Odds by Allen Wyler
Max Maxfield
11 comments
Generally speaking, when it comes to settling down with a good book, I tend to gravitate towards science fiction and science fantasy. Having said this, I do spend a lot of time reading ...

Martin Rowe

No 2014 Punkin Chunkin, What Will You Do?
Martin Rowe
1 Comment
American Thanksgiving is next week, and while some people watch (American) football all day, the real competition on TV has become Punkin Chunkin. But there will be no Punkin Chunkin on TV ...

Rich Quinnell

Making the Grade in Industrial Design
Rich Quinnell
13 comments
As every developer knows, there are the paper specifications for a product design, and then there are the real requirements. The paper specs are dry, bland, and rigidly numeric, making ...

Martin Rowe

Book Review: Controlling Radiated Emissions by Design
Martin Rowe
1 Comment
Controlling Radiated Emissions by Design, Third Edition, by Michel Mardiguian. Contributions by Donald L. Sweeney and Roger Swanberg. List price: $89.99 (e-book), $119 (hardcover).