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activexp 5th March 2012 09:43 AM

Hi, does the quoted height of the TDA892xSMPS amplifiers include the heatsink? I am limited to a maximum height of 54mm.


Cristi 7th March 2012 02:05 AM

The height of the TDA8920SMPS modules is aprox. 50-53mm with the thin version heatsink and default capacitors. the height of TDA8950SMPS with the taller heatsink and taller caps is 65-70mm. If will be used in an metallic enclosure which can provide cooling, the heatsink can be removed and the board can be installed directly on the enclosure wall, keeping the clearance and adding an insulating sheet between the board and enclosure. Thus the thickness will be just 34-38mm for the TDA8920SMPS and 42-45mm for the TDA8950SMPS.

activexp 7th March 2012 08:04 AM

Thanks Cristi, that's most helpful :)

Shatronics 27th March 2012 01:48 PM

I have a TDA8950SMPS and I would like to know what the expected output would be to bridge it to a 16 ohm load?
According to datasheet for the TDA8950 it would be 150W @ 0,5 % THD and 200W @ 10 % THD. Is that also applicable for the module I got?


Simon H.A.

Cristi 28th March 2012 05:01 PM

Simon, The real output power with <1% THD at 16R in BTL mode which can be obtained is twice the power on each channel on 8R. that means about 110-120W.
The power supply provide +-35V regulated voltage to power stage, which is enough for delivering up to 120W on 16R. on the IC datasheet they recommend to supply the ic from an uregulated power supply with +-39V which in real operating conditions is expected to drop down to the same value as i use, +-35V. thus, another advantage of using the lower voltage, regulated supply is lower idle losses, because the power supply voltage does not rise at idle as it happens with an uregulated supply.
The datasheets or many power amplifier IC's exaggerate for obvious reason. On the front page is written with one foot size letters the maximum possible peak power at the highest THD level then the real value is written somewhere in the next pages. This is a common way to sell a part, among the semiconductors companies, take another example, the Drain current of MOS-FET's is stated in catalogs on the first page the value found at 25*C then somewhere further can find the value at 100*C as well, altough in real-life working conditions, and for a robust design, only the 100*C value should be considered.

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