TPA3116D2 lowest THD+N

[abraxalito]

I've not listened to an amp with those particular ferrite chokes so I'm only guessing. Ferrite is a fine material for all sorts of applications, but I've noticed distortion (subjectively) when using it as the core material on the output of classB chip amps. Powdered iron has a much high flux capability and when it does saturate then it does so gracefully. Ferrite 'cracks' in a subjective sense. If you only listen at very low volumes then perhaps you'll hear no difference.

 

[xrk971]

I am planning to get a TPA3116 board from ( Yuan Jing Audio - ON SALE! - TPA3116 Class-D Stereo Amplifier Board [50W+50W] - $13.99http://rover.ebay.com/rover/1/711-5...io01-20&ipn=psmain&kwid=902099&mtid=824&kw=lg )

I am planning to use them with my Fostex FF125WK. I am thinking about ways to make them run perhaps at a lower THD+N rating than they would at 50Watts. FF125WK is happy(and me) at even 15 watts for sure.
Is there anyway to modify this board or powersupply to make it run at a lower power rating and THD ?

If you look at the TI spec sheet, running the 3116 with a higher voltage supply, using a 4 ohm speaker, and staying below the THD cliff will keep the THD at levels below anything you can hear. For example, 19 volt smps brick, 4 ohm speaker is good for less than 0.1% thd if you stay below about 35 watts/ch. Plenty of headroom if all you need is 15 watts. At 8 ohms, you can try a 24 volt ps and stay below 30 watts for thd under 0.1%. See Fig 10 of spec sheet.

 

[paskal9]

I've not listened to an amp with those particular ferrite chokes so I'm only guessing. Ferrite is a fine material for all sorts of applications, but I've noticed distortion (subjectively) when using it as the core material on the output of classB chip amps. Powdered iron has a much high flux capability and when it does saturate then it does so gracefully. Ferrite 'cracks' in a subjective sense. If you only listen at very low volumes then perhaps you'll hear no difference.

nice. a guess.
suggesting an iron toroid (for low power use) against a shielded ferrite. nice.

i'm sure the cheap, small, pesky little black ferrite will saturate and cause more cracking distortion compared to the iron toroid. like when you draw 500W through them. like the tpa3116 is ever capable of doing something like that.

i've run more than 500W through a ferrite, causing them to crack into pieces. more than a couple of times. worked with iron toroid with various material, listening to their effects on the audio signal. and currently have tpa3116 with the cheap, pesky, little shielded ferrite.

i'm guessing the guy suggesting that it's perfectly acceptable for a class d at 10% THD have never actually listened to a class D at 10% THD.

for the rest of you, continue discussion at the original tpa3116 thread. this thread is way bloated with useless and incorrect information.

 

[abraxalito]

nice. a guess.
suggesting an iron toroid (for low power use) against a shielded ferrite. nice.

Another guess - this is a sarcastic remark, right? So in your attempt at humour you must've missed that an iron powder cored toroid is inherently shielded yeah? And that a ferrite cored inductor such a low value (22uH or 10uH) is going to come with an air gap?