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Class D Switching Power Amplifiers and Power D/A conversion

TPA3116 D2 mono amplifier as a stereo system?
TPA3116 D2 mono amplifier as a stereo system?
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Old 3rd December 2018, 06:38 AM   #91
1152 is offline 1152
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I have absolutely abused, even put mismatched and low impedance loads on the Lepai 2020TI 3118 chip in the Arizona summer and it has gone into protection at clipping (I’m assuming without measurements) but has never got hot amazingly. I played it LOUD for hours on 19v power, but the supplied 12v is plenty for normal bedroom use. So there is something to be said about implementation - there’s really nothing to this board.
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Old 3rd December 2018, 11:02 PM   #92
Bob Richards is offline Bob Richards  United States
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Location: Portland Oregon, USA
Originally Posted by FauxFrench View Post
Hi Bob,
You seem to have better gear than I and lengthy experience. I will only give you a few ideas for possible inspiration.
Many cheap TPA3116 boards have insufficient power line decoupling. I typically use 10000uF at the amplifier power supply terminals for extra decoupling. It may be exaggerated but rather too much than too little. I see you use a power converter (step-up I assume) before the amplifier. Such a converter often has little output buffer capacitance.
Did you try the poor amplifiers in a configuration that normally works: A 19V laptop charger with at least 2200uF before the amplifier power terminals?
For your power measurements I guess you use dummy-loads. May they be inductive (from a photo I see wire-wound power resistors).
I do not see the poor TPA3116 boards. I have tried several very cheap TPA3116 boards and normally they function quite well with a bit of modifications.
I was using an actively regulated power supply that should have had a near zero source impedance, but also added a big Electrolytic, probably about 10kUF just to be sure. The cap is especially necessarily needed if the amp brd. will be powered by battery. As a battery discharges, it's source impedance goes up significantly, which often causes an amplifer to oscillate, and/or have problems with overdrive. That can lead to speaker burnout. I also added 0.1uF ceramic caps to the amp board right where the power supply comes in, as one more precaution. Most amplifier circuits of any type need to see a very near zero ohm source impedance in the power supply, especially at very high frequencies (to at least 1mHZ IMO), or the phase margin issues get thrown way off, and oscillation results.
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Old 3rd December 2018, 11:13 PM   #93
voltwide is offline voltwide  Ireland
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Originally Posted by weissi View Post
I'd exclude that. The mono boards (TPA3116) stay completely cool with the copper plate only, I guess they do not even reach more than 35C while the Sanwu 2.1 board (TPA3118, GND plane vias have been resoldered + xtra heatsink on top) heats up to ~70C. I guess I can trust "FalscherFranzose" aka FauxFrench in his diagnosis.
You can, too low clock frequency is the most probable fault imho.
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