Replacement for TDA2050v

[JonathanAnon]

Re: Replacement for TDA2050v

Hi guys,

thanks for all the helpful responses.. Farnell and Radionics are the two suppliers that I use here in Ireland and both list the TDA2050 as gone.. Farnell says "No longer manufactured"...

http://ie.farnell.com/stmicroelectro...45?ost=tda2050

I actually have an LM1875T in my box here. I found a single supply circuit for it... I'll breadboard this and try it.. It is very very similar to the current single supply circuit that I am using with the TDA2050.


Here's a quick look at my handy work. I'm trying to use just a smaller package chip as it's only on a small piece of stripboard. There no max current specified on the stripboard, but I'm sure it's probably good for 2A. Here's how it's looking so far.... (edit: I havent done the mic part of the circuit yet).

[Longbow]

Re: Replacement for TDA2050v

Good Class D amplifiers have better distortion figures than Class AB.

Untrue. This ethereal statement may appear in a text book somewhere. But as you would expect, there are always trade-offs. Class D was designed to offer efficiency and low cost which it does quite well. Class D amp modules are used almost exclusively to power the multiple channels in whole house area amplifiers, for example, which are designed for low volume audio at a reasonable price and with minimal heat. Class D is also great for car amplifiers, because the owners are not concerned with distortion levels.

For more critical listening, the residual switching carrier of class D raises the noise floor unacceptably. The output stage must essentially reconstruct a sine wave from square wave, which is a difficult task even at one particular frequency, let alone the whole audio spectrum. And, the overall result is also affected by the particular drivers connected to it.

Having said as much, class D audio modules do not differ much one from another. Have a look at the recommended switching frequency for a basis of comparison. If one particular type is NLA, it should not be a problem to install another (assuming the pinout is correct).

[stj]

Re: Replacement for TDA2050v

well they arent the ones used on tv's then!

[tom66]

Re: Replacement for TDA2050v

class D - the D stands for Distortion!!

Good Class D amplifiers have better distortion figures than Class AB. And they are much more efficient and work with lower input voltages for a given power output.

[ben7]

Re: Replacement for TDA2050v

Class D doesn't sound bad to me. There are some very good class D amplifiers out there. They are cheaper, lighter, and more efficient as well.

[stj]

Re: Replacement for TDA2050v

class D - the D stands for Distortion!!

[ben7]

Re: Replacement for TDA2050v

Hah, mariush beat me to it. I was going to say, a class D amplifier needs either a very small, or no heatsink!
Only downside is it's likely going to be an SMD chip.

Hey, the LM1875 has the same pinout. Can't guarantee that it would be a drop-in replacement (looks like it would to me, with different feedback resistor values), you'll have to carefully check the specs to see if it would be ok.
https://cdn.badcaps-static.com/pdfs/...e9ec9f67d4.pdf

-Ben

[mariushm]

Re: Replacement for TDA2050v

Jonathan, tda2050 can still be purchased and it's an easy to use chip, you can find it at online distributors like Digikey or Mouser but since you're in Ireland it's probably better for you to use Farnell or TME.eu

I would like to point out that TDA2050 *is* a 32w amplifier chip, but that's basically what the chip can do at almost the maximum input voltage it can tolerate and with some significant distortion. In real world, you don't want to push it that much because it would sound bad, a more realistic output would be about 25 watts but again, provided it gets enough input voltage.

Check the datasheet : https://cdn.badcaps-static.com/pdfs/...31cada06bb.pdf

On page 3, you can see it can do 32w with d=10% which is bad, and only at +/- 22v (or about 45v if you power it using single mode power supply).

With 12-14v available from a car's battery, you'll only get about 5 watts from a TDA2050, as you can see on page 8, figures 8 and 10.

The X axis on those graphs shows voltage in split mode power supply so your 12v is equivalent with +/- 6v on that x axis scale, and with that in mind you can look up on the y axis to see how much power you'd get from one.

The tda2050 is also fairly inefficient at around 60-70%, you'd waste your car's battery with it.

For a car amplifier working at 12v, you'd be better off with a Class D amplifier chip.

[stj]

Re: Replacement for TDA2050v

http://www.st.com/web/en/catalog/sen...5/CL1503/SC979

[JonathanAnon]

Hi there,

I've just worked out the perfect design for my car kit... rang to order a few of these chips and they tell me that the chip has been discontinued... Contacted my supplier and they cant suggest a suitable replacement...

It's to work in my car, I need it to work with a 12v single source power supply and up to about the same wattage as the TDA2050, which is 32W... Anybody got any suggestions as to what I should use as a replacement...

thanks,
J