AnsweredAssumed Answered

TDA7492P Load Impedence

Question asked by Engineer on May 8, 2015
Latest reply on May 11, 2015 by zhao.yuntao
Hello, I am designing an Audio Amplifier that is capable of connecting to 4 ohm, 6 ohm and 8 ohm speakers. I need to be able to run at an output of 25W at 25V so I decided to go with the TDA7492P. For reference, I have puchased the 50W and 20W Evaluation Boards and everything is great so far.

Question: The reference design of the 20W Amp shows the following image.
Capture.JPG

BUT! The 20W Evaluation Board has a 33uH Inductor and a 220nF Capacitor and it claims to work from 4-8ohms at the top of the design and further on down in the datasheet it says 6-8 ohms. This has me very confused and I would like some clarification. According to the picture above, This should only support 8 Ohms. Otherwise the other loads will be much louder.

If I use a 220nF Cap with a 33uH inductor, will I get my design to work equally from 4-8 ohms or will I need 3 different set ups to support 4, 6 and 8 ohms?

Outcomes