Replacement for TC2000 to drive STA5** - diyAudio
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Old 22nd October 2013, 07:42 AM   #1
clong is offline clong  United Kingdom
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Default Replacement for TC2000 to drive STA5**

I am relative newcomer in Class D amplification, but have been reading the forum for a while now.

I am trying to build my own amplifier, and had originally wanted to base it on the very solid TC2000 & TK2050 design, however I would like to use components which are still made and available in the UK- if it's in stock at Mouser, Farnell, etc. then that's fine.

I see the STA505, STA508, STA510 seem to have replaced the TK2050 by and large- although I can't quite work out whether the 505 is *literally* indentical to the 2050.

These amps obviously don't take a "naked" input and need it to be processed by an appropriate chip before it is fed into the power amp.

Is the TC2000 still made- and if it is, who the heck makes it?

I would have thought it would have a replacment starting with STA, like the STA309- which unfortunately is far too complex for me. I want a simple chip that will just take my normal input and prepare it for the amplifier.

Any help is much appreciated- links to datasheets or names of chips would be ideal.

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Old 22nd October 2013, 06:38 PM   #2
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Very interesting amplifier, look.
The author spoke about a 4 layer board
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Old 24th October 2013, 02:19 AM   #3
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I'm not sure if any of the Tripath ICs are still being produced, but with the abundance of them out there I would have to believe that they are. Anyway, you can still find them fairly easily from Asian sources. You can call them fakes if you want, but how "fake" is something that works as intended?

The TC2000/TC2001/TCA2002 go for about 3USD each on ebay.

From the wording of your post though, this might be beyond your capabilities (no offense).
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Old 28th October 2013, 05:58 PM   #4
clong is offline clong  United Kingdom
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I saw that Russian thread but the translate doesn't help me though unfortunately.

I would rather not buy groom sources who can't guarantee volume, perhaps I should check alibaba.

In short, nobody knows beyond guesswork then?
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Old 29th October 2013, 05:27 PM   #5
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This is very simple yet you seem to be having a hard time understanding some things here.

The STA50x are class-d POWER stages. They require a class-d modulator to build a complete amplifier. They were originally designed to be used with STMicroelectronics digital input modulators (which you already said are too complicated for you).

Tripath adopted the ST power stage and rebranded it the TP2050 for use with their own modulator.

Here is the point you need to stop and consider; you will NOT find any other modulator ICs that were specifically designed to be used with the STA50x. There are tons of options available for modulators, but YOU have to figure out how implement them with this power stage. There are no documents out there that will hold your hand in the process.

If you don't want to use the TC2000/TC2001/TCA2002, then you need to figure out how to implement a different modulator or abandon this idea. Perhaps you should start out with a complete class-d amplifier IC like some of the offerings from Texas Instruments or even NXP.
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Old 30th October 2013, 08:40 AM   #6
clong is offline clong  United Kingdom
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theAnonymous1, thank you. That was exactly the information I was after, but my searches turned up nothing.

I have a hard time understanding it as I couldn't find this information elsewhere. Where did you get your information from? Is there somewhere I can read about modulators?
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Old 15th November 2013, 01:30 PM   #7
ddapkus is offline ddapkus  United States
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Hi, clong,

I am the Apps Manager for our Audio Products at TI, so I'm going to tell you about our solutions... I hope you don't mind, but I'm a little bit prejudiced...

I have been wondering about Tripath myself. I know the company itself it gone, but it still seems like chips are available, and I don't understand where they are coming from. I heard one rumor that they built up a lot of inventory, and then sold it to distributors when they closed up shop. Since they were fabless, maybe someone bought the rights to their designs and continues to build them.

Anyway, we have a wide selection of modulators, power stages, and class-D amps at TI.

My favorite part is the TPA3116D2, which, if used in "PBTL" mode, can be used to deliver >150W into a 2-ohm load, and is really simple to use - analog input, class-D speaker drive output. I could see this being used for a nice mono block amp...

Along similar lines, we have the TAS5630B which is a 2x300W analog input class-D amplifier. Due to the higher powers involved, it is a little bit more tricky to use. Care is required in the PCB layout; I usually recommend people copy the EVM as closely as possible since we know that works well.

Finally, we have solutions like TAS5558, our latest modulator IC, and the TAS5624A power bridge. Most of the modulator ICs take I2S input, and convert it to PWM to drive a power stage. The TAS5558 requires the use of a micro to program the TAS5558, but, you can do some cool audio processing using it.

We try to have our EVMs mimic how the parts would be used in a real system, so if you check them out, I think it will give you more insight.

A few of us TI guys hang out here on diyAudio, but we are all a lot more active on our forum, called, e2e (engineer to engineer). Most of the discussion there is about device specific questions rather than higher level system implementation questions, but you might find it useful. You can join us at: TI E2E Community. The Audio Amplifier-specific forum is at: Audio Amplifiers - TI E2E Community. We also have a Wiki for common questions as well.

I hope this information was useful to you.

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