A related question is a question created from another question. When the related question is created, it will be automatically linked to the original question.
If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.
TPA3136D2: Question of the Power Limit Equation of the TPA3110 and TPA3136 Families
Hello Wayne! I'm not sure if i understand your question? this is just a simple rule-of-thumb that we use for all of these similar devices in calculating maximum output power at 10%THD.
Hello Shawn! Do you have a reference to any app note or e2e thread that may help explain this better for Wayne? Thanks, Jeff
This number (1.25) is basically from our measurement data. Please be noted that this is only used for the rough estimation and it's not a calculated number. Generally PLIMIT function is only used for speaker protection, so this fucntion is only used to estimate the voltage on PLIMIT pin. Please don't use it for high precesion calculation. I attached a document to explain how this feature works. This document is for TAP311x, but also applies for TPA3136D2.
From our other device datasheet, e.g. TPA3116D2, you can see the difference between 10% THD and 1% THD. In the Figure 13, you could see that the output power with THD=10% is around 1.25 times of THD=1%. This is not accurate but rough relationship.
