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TPA6110A2 - Minimum Cap Suggestions
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Q: TPA6110A2 - Minimum Cap Suggestions
One of our local customers is looking to see if we have suggested min cap values specified for the TPA6110A2 when interfaced with various impedance headphones (i.e. 4, 8, 16 ohm). Your inputs are appreciated.
A: Re: TPA6110A2 - Minimum Cap Suggestions
The simple answer is that it depends on what is acceptable in the application. This value directly affects bass response of the headphone, so if this is not important, the size of the cap can be reduced. However, I will make some recommendations based on tradeoffs between performance and cap size.
Since the TPA6110A2 is not spec'd for a 4ohm load, I will assume that an 8 ohm is the smallest load in the application (the smallest load represents the worst case scenario for bass response). A 470uF cap would give a cutoff frequency of 42Hz with an 8 ohm load. This is a pretty good bass response but might be too large and too expensive for the application. A 68uF cap would have a 300Hz cutoff frequency and would cost considerably less than the 470uF.
I could keep giving you cap values, but the best thing is for the customer to evaluate the tradeoffs themselves. Just remember to use the smallest load as a starting point since larger loads will give better performance for the same capacitor.
Also, please refer the customer to the Application Information (pg 14-15) on the datasheet. It provides important information on the relationships between the output, input and midrail bypass capacitors.
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