And unfortunately I've had the fake one burn up a speaker at one point. It put full Vcc on the speaker terminals and made smoke! Thank you China! I guess that's what I get for trusting China in the first place. I definitely learned to count pins after this event a couple years back now.
Not really. In my case, I like having everything small and portable. I tend to build (loosely build meaning wire up) TPA3118 boards in Altoids Mint containers. I can put this in my pocket and throw the 24V laptop brick in a backpack or whatever else I happen to be carrying and I happen to have a bunch of them all over the place. It's just a convenient power supply and the TPA board is so small that it's super portable. Weighs in the ounces instead of pounds.
Can't do this so easily with a chassis or 2U rack mount which would be required for a dual rail supply.
I have been building and using class-D modules based on genuine TI-chips for about 12 yrs.
Not a single burning failure occured during all these yrs.
These chips look pretty reliable to me, never used additional speaker protection.
Never had that either with any TPA3116/3118 contrary to TA2020, TA2022, TA2024 and very unfortunately MA12070 (the already discontinued king of sound). The ones you love hurt the most 🙂
MA12070 likes 24V single rail but make sure to read the addendums to the datasheet and/or choose a fully equipped ready made version! Maybe TPA3156D2 is exactly what you like. Haven't tried it myself yet. If you build it with internal 24V PSU and DC jack with 2 x Schottky diode "best battery system" you can have the benefit of both. One less brick to carry.
https://www.ebay.com/itm/325126574459
MA12070 likes 24V single rail but make sure to read the addendums to the datasheet and/or choose a fully equipped ready made version! Maybe TPA3156D2 is exactly what you like. Haven't tried it myself yet. If you build it with internal 24V PSU and DC jack with 2 x Schottky diode "best battery system" you can have the benefit of both. One less brick to carry.
https://www.ebay.com/itm/325126574459
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They have all kind of in-built protecftion.
But no internal protection could save your speaker in case of burning output MOSFETs.
A catastrophic failure I did not observe until now.
So you mean the internal mosfet inside the chip? In the data sheet, it seems like they have some countermeasure for the output failing. Maybe not.
You cannot disable a burnt internal MOSFET - in that case all internal protection is moot.
btw, I discovered a data sheet of 28pin TPA clone:
https://www.lcsc.com/datasheet/lcsc_datasheet_2412061750_TMI-TMS8609F-TR_C29779848.pdf
Comparing the datasheets, this one is definitely inferior in relation to TPA3118
But not too bad considering the price tag <0.07US$
btw, I discovered a data sheet of 28pin TPA clone:
https://www.lcsc.com/datasheet/lcsc_datasheet_2412061750_TMI-TMS8609F-TR_C29779848.pdf
Comparing the datasheets, this one is definitely inferior in relation to TPA3118
But not too bad considering the price tag <0.07US$
So there is no way that the chip has something internal that follows the mosfets to disconnect? Seems I had seen something in tpa datasheet that said output of each device goes to 1/2 vcc in the case of a DC on output fault.
You still did not get the point.
Only working output MOSFETs can be disabled by internal protection circuitry.
Burned ones are melted and short the output to supply voltage no matter what internal protection is doing..
You cannot block a melted MOSFET by removing its gate voltage
Only working output MOSFETs can be disabled by internal protection circuitry.
Burned ones are melted and short the output to supply voltage no matter what internal protection is doing..
You cannot block a melted MOSFET by removing its gate voltage
I think you may have mis-read my last post or perhaps it wasn't worded very clearly. What I had asked is if there's something inside the package (TPA3118) case that disconnects the MOSFET output transistors from the load. I seem to have read that this chip has DC on speaker output protection. I think it's stated in the datasheet.
Fortunately , I didn't faced this issue but these AliExpress fakes can't handle difficult 4 Ohms speakers with impedance dips. Audio cuts out during deep bass and a sensitive tweeter emits continuous buzzing sound, audible during quiet passages I'm using these for the last 5y regularly as a PC speakers (6 Ohms Sony ) with a Laptop brick @19VDC. I also have a Allo Volt amp with the genuine 32 pin IC, it handles 4 Ohms gracefully those same speakers.
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Those (Sanwu?!) used to be excellent boards. Have used quite a few of them. 6 Euro a piece then.
If you wanted to keep using them PCB mount connectors were mandatory as the PCB tracks peel off easily.
If you wanted to keep using them PCB mount connectors were mandatory as the PCB tracks peel off easily.
I very well understood your posting. DC offset protection inside the chip works in case of input dc imbalance and similar and will disconnect power MOS gate drive. There is no way to implement a distinct "power disrupter" inside a semi. So the short answer defintiely is "no". At the very end you always have to rely on the ruggedness of internal power transistors. There is a plethora of chips on the market or obsolete ones well known for "mysterious" failures. These TI chips are not in my black list until now.
This one is good, but this one (on the left) is even better sounding. I could never figure out why. I did some swapping of inductors and caps. I didn't spend more than an hour or two on it, but there's a difference.
Attachments
I haven't read every post in this thread and there are so many here that I can't keep track of who has said what about what. Sorry.
So I gather you have had a TPA3118 (GENUINE) fail with the power supply short to output and burn the speaker. And in my previous post (that you didn't answer) I did ask genuine. Chinese does NOT equal genuine.
So I gather you have had a TPA3118 (GENUINE) fail with the power supply short to output and burn the speaker. And in my previous post (that you didn't answer) I did ask genuine. Chinese does NOT equal genuine.