300W+300W TPA3255 - How Much Power can it really do? #TPA3255 #Micsig

In this video '300W+300W TPA3255 - How Much Power can it really do?’ I’ll show how much power it can do without a fan and then with a fan.

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[Expedition]

Love how you covered every question that popped into my head after first few minutes of lay up. Fan use, small fan, fan placement and usage of different meters and seperate measurements from all. Good work and great video

[robmccoy]

Mr. Beeny is great, lots of valuable content.

[joat_mon]

We electronic types must be part rabbit... We go down rabbit holes pretty often. 😁
Thanks for the video!

[versace]

HI EDDIE, You do a great job explaining the information and also making it very interesting and Knowledgeable. Thank you 😃👏😁👍

[ChrisDIYerOklahoma]

Great set up and testing! So, bottom line, what is the actual (old school stereo rating) RMS wattage power @ 4-ohms with a 48v power supply?

[brunobassi]

Tpa 3255 allows 20-25 watts (clean) with a distortion of less than 0.1% even at 20 kHz at 4 Hom and 8 Hom.
The power is bigger but if you want a good hi-fi it is about 25 watts because beyond it gets dirty like all class D.

[yuhoyintony]

D類擴音機 的 效果 有測試 結果 ，文字寫出來就 更加好了。TDA TPA 多種評測 出來 就無敵了，不是太多專業人士作出 評測 呢。我感覺D類 再 配搭一台 胆前級 接收，效果都非常好了，價錢平宜，享受音樂 好像很足夠了，再配1對 不俗的 無源音箱，100美元的100-150W 95dB SPL

[michaelspiering]

So do you think that the 300x2 power rating is a bit of embellishment? Or, do you think that is a dynamic rating?

[Scrufboy]

What difference does having the small fan pull the heat off of he heatsink show?

Aiyima just released last November, a pro unit of their A07 TPA3255 implementation. They made some design changes to their thermal interface by introducing a small ingot like chip of aluminum between the 3255 and the heatsink. This had thermal compound on both sides. I swapped this aluminum bit for a pure copper ingot of the same shape and thickness and I upgraded the compound to Thermal Grizzly Kryonaut Extreme - 14, 2 W/m*K. This greatly improved the cooling of my unit. My op-amp upgrades though forced me to put some custom heatsinks on the regulators... I don't have a means to efficiently put vent holes in the aluminum chassis so I might run it without the top.

Great video... Thanks for updating us!

[giulianosteifn]

I have seen the video many times, but nothing about the audio power. Only temperatures. I need to know the output audio power for different impedances. Thanks.

[fredcoy]

Thanks for your straightforward explanations in a easy to digest, pragmatic way. On power supplies, I bought some 1KVA toroid transformers years ago with the idea of PSs for class A amps, it never happened. They have dual secondaries each 42V no load, dual primaries too. Now I want to use them to power LFE/subwoofers using something like A TPA3255 based bridged amps. Trouble is the voltage is not right for optimal results. What do think? A regulator to bring it down to 48 VDC? Any insight or ideas you provide would be greatly appreciated.

[TheGKnows]

Hi
Great work! I would like to use Aiyima A07 Max TPA3255 Board with 13S Battery max 54.6V output. TI recommends between 53.5V and 56, 6V with 6Ohm. I would run 4Ohm Speaker. Would be nice if you could test the board if it will work with 54.6V
Thank you!

[dennissinger]

What is the best tpa3255 Board ?
I need one for my 8 ohm 10" speaker . I thinking maybe to buy one mono for one single 10" pa speaker. I have now one tpa3251 2.1 board but i need more watt .

[janoschluccamarek]

Wich amp-board would you recommend me for a powerful speaker like the Precision Devices PD.186/3 or the PD.153ER/2 ?

[jutukka]

Very nice video!
I have a late 80's 2x250 W rack tube amp which is a bit bigger than this 2x300 watter, it weighs about 25 kg. 🤓 The cooling fan is about the same size as this amp.😁
BTW, why does your oscilloscope tell that 16.02 VAC RMS is over 46 Volts pk-pk? Shouldn't it be 2.828... x 16.02V p-p which is only 45.31V? (Same thing later in the video with 2.585 VRMS which was shown to be over 9V pk-pk, should be around 7.31 V p-p.) Is it not sinusoidal or is the scope measurement so inaccurate?

[arthurswanson]

What is the max voltage this setup can output into a high resistance load (like say, 100K?) Will it approach the rail limits supplied to the amp, with the current draw in mA?

[cobar]

I recall Michael felt that this amp was good for about 65 useful watts

[xorkcorknup]

Hi! I am a bit confused about the wiring. I want 600w in mono. How should I connect the speaker wires? Thanks in advance

[avguytx]

Ok, did I miss what the rating would be on this amp if it was rated like, lets say, an amp like the Yamaha A-S801? (an example) What about xx watts per channel @ 8-ohm from 20hz to 20khz @ 0.xx% versus these power ratings that are like cheap Pyramid car audio amps of the 80's and 90's.

[windward]

I hate the TPA3255 Power Pad package. Why is the power pad on top of the package and not the bottom?
How do I conduct heat from the pad without putting uneven mechanical clamping stress on the package?
How do I streamline production if you require me to have a specialist assembly method as to not overstress the part end of line when I attached the heatsink?
How do you evenly distribute force over the chip without having a companion plate on the opposite side of the board? The FR4 board is not rigid enough to handle these point stresses without deformation, especially over the expected PCB temperature range of a power amp.
How is this product tested and / or repaired with the heatsink in place? As with this demo board you cannot get to the pins on the IC.

You can use a high tech plastic to make plates and receivers (like Delrin) to help regulate the clamping force across the whole IC, but this is very expensive and labor intensive in assembly.

Please TI if you are reading this, give me an alternative package with the power pad on the bottom of the IC and it might actually have a chance to be purchased and go to production.