TDA7850 CLASS AB HIFI DC12V
It can replace class D amplifier as hifi level performance improvement.
The TDA7850 is a breakthrough MOSFET
technology class AB audio power amplifier in
Flexiwatt 25 package designed for high power car
radio. The fully complementary P-Channel/NChannel output structure allows a rail to rail
output voltage swing which, combined with high
output current and minimized saturation losses
sets new power references in the car-radio field,
with unparalleled distortion performances.
The TDA7850 integrates a DC offset detector.
THD Distortion
Po = 4W 0.006%
Po = 15W; RL = 2R 0.0015%
It can replace class D amplifier as hifi level performance improvement.
The TDA7850 is a breakthrough MOSFET
technology class AB audio power amplifier in
Flexiwatt 25 package designed for high power car
radio. The fully complementary P-Channel/NChannel output structure allows a rail to rail
output voltage swing which, combined with high
output current and minimized saturation losses
sets new power references in the car-radio field,
with unparalleled distortion performances.
The TDA7850 integrates a DC offset detector.
THD Distortion
Po = 4W 0.006%
Po = 15W; RL = 2R 0.0015%
Attachments
That is copy-and-paste datasheet description, not ?
Have you measured actual performance at 12V ?
And I wonder if it works at all with 8R load ?
Patrick
Have you measured actual performance at 12V ?
And I wonder if it works at all with 8R load ?
Patrick
You are absolutely right. This is what I copied.
Because I think the English of ST company is better than me, isn't it.
In most cases. The distortion of 8 ohm load is less than that of 4 ohm load.
Because it passes less current.
This is a relatively simple MOSFET four channel BTL amplifier
If higher voltage output is required. You can use higher voltage.
I think it is generally enough.
So you have no measurements of your own, especially at 12V as your title suggested.
Cheers,
Patrick
Cheers,
Patrick
I seldom take the initiative to measure IC amplifiers.
For example, lm3886，1875. Of course, I can take some time to measure it.
I'll find time in two days. In fact, this kind of integrated circuit amplifier.
I think someone with a little experience. We can judge its performance index. It's like a bike.
I can tell at a glance how fast it can run. Of course, if you want to see the measurement data.
I will be in a few days. Take time to test and send data. I think it's similar to the information of ST company.
Because I have measured njm4580d thd 0.0005% before, which is exactly the same as that of JRC company.
As a dealer who aspires to stand out from the rest, shouldn't we expect a bit more from you than the average ebay or aliexpress vendor ?
There are numerous such modules on offer.
Cheers,
Patrick
There are numerous such modules on offer.
Cheers,
Patrick
Thank you for your expectations.
In fact, tda7850 is a very cheap product. I just found that many people use inferior class D amplifiers. Tda7850 can be better. Even cheaper. For example, my product. The price is about $9. In fact, there is no profit. I don't mind DIYer buying things made by others.
Because it's really very simple. The total number of components is only 6 capacitive resistors. So you don't need to buy what I produce.
And it has four channels
I'm just giving advice. It is better than tpa3116。3225 or even ma12070.CLASS D And cheaper.
I think whoever produces the tda7850 should have almost the same performance index.
Because relative to class D.
It has no high-frequency PWM. So the 7850 is easier to make. The performance is basically the same as that of ST company.
Although some models of class d have good performance indicators. But that requires a very high PWM frequency. Very demanding inductors. And strong EMI radiation. The actual performance of class D is lower than the official data.
Attachments
Good advice.
If you only believe in datasheet, then TDA7560 has even slightly lower distortion.
But may not be so easy to get.
Patrick
If you only believe in datasheet, then TDA7560 has even slightly lower distortion.
But may not be so easy to get.
Patrick
I checked the information. I think they are not much different.
Careful discrimination will find that the tda7850 is slightly better.
Attachments
It’s evident that ljm_ljm is confusing diyAudio members with usual AliExpress customers which would give five stars rating to any amplifier not going down in flames, upon being powered up.
AliExpress
The largest sales volume is tpa3116 and tda8950.
Because it's very simple. Although the effect is not very good.
I will not be new. Judge good and bad with the old.
In fact, most of the current audio amplifiers are not as good as those of the 1980s.
Of course, businesses don't like this. Businesses prefer new products to replace old ones every year. In this way, customers can constantly change products.
In fact, many things have not improved in the past 30 years.
Instead, it went backwards., I mean performance. of course. It may also be cheaper
The quality of components has also declined. Because cheaper components are needed.
We can find some Motorola transistors produced in the 1980s and 1990s.
Then compare the current ONSEMI. Its copper is reduced by 50%.
Last edited:
Was looking at tda7454 since I found authentic parts for $2/ea. Looking to build a 24ch amp for my active line array. These 4ch AB ic chips have very low BOM count, so they are tempting. In practice I’d be using <1W per channel to 4ohm load. Any suggestions for other parts to consider given the low power scenario?
I see tpa7564 and tda7561 are also available for $3.30/$4.40 but they are i2c based and I don’t think it’s possible to use them without a microcontroller and programming.
Was looking at Pam8406 in AB mode, good up to 2W with very low thd, and inexpensive/low bom count.
I see tpa7564 and tda7561 are also available for $3.30/$4.40 but they are i2c based and I don’t think it’s possible to use them without a microcontroller and programming.
Was looking at Pam8406 in AB mode, good up to 2W with very low thd, and inexpensive/low bom count.
Are parts like this (https://www.aliexpress.com/item/2251832622631593.html) likely to be authentic or knock-offs? Hard to imagine they are using authentic for $6/kit when the TDA7850 IC alone is at least $7.50 per 1k pieces from Digikey/Mouser.
I'm not sure whether the website product you sent is authentic.
But China does have many fake chips.
I can only be sure that the products I sell will not be fake.
Attachments
Dm me a link? On the fence about having my own boards made or upgrading an existing one.
TDA7850 Revision History
Table 5. Document revision history
Date Revision Changes
22-Nov-2006 1 Initial release.
27-Feb-2007 2 Added Chapter 3.Electrical characteristic curves.
09-Oct-2007 3 Updated the values for the dVOS and Iq1 parameters on the Table 4.
Added Figure 20 on page 13.
12-Sep-2008 4 Updated Figure 2: Standard test and application circuit.
Updated Section 4.4: DC offset detector and Section 4.3: Standby
and muting.
Updated the values of VOS and THD parameters on the Table 4.
07-Nov-2008 5 Modified max. values of the THD distortion in Table 4: Electrical
characteristics on page 8.
17-Sep-2013 6 Updated disclaimer.
From ST data sheet.
It seems chip was first released in 2006, very recently.
🙄
Table 5. Document revision history
Date Revision Changes
22-Nov-2006 1 Initial release.
27-Feb-2007 2 Added Chapter 3.Electrical characteristic curves.
09-Oct-2007 3 Updated the values for the dVOS and Iq1 parameters on the Table 4.
Added Figure 20 on page 13.
12-Sep-2008 4 Updated Figure 2: Standard test and application circuit.
Updated Section 4.4: DC offset detector and Section 4.3: Standby
and muting.
Updated the values of VOS and THD parameters on the Table 4.
07-Nov-2008 5 Modified max. values of the THD distortion in Table 4: Electrical
characteristics on page 8.
17-Sep-2013 6 Updated disclaimer.
From ST data sheet.
It seems chip was first released in 2006, very recently.
🙄
https://www.aliexpress.com/item/100...ne.0.0.1e344edfymnhPB&gatewayAdapt=4itemAdapt
This is from an agent. quality goods. But I don't know how this international transaction cost is generated.
Maybe it includes postage. The actual price is about $7.50.
It may include postage. Alibaba's service fee.