Part Number: TAS2563
Other Parts Discussed in Thread: PP-SALB2-EVM
Hello,
I’m developing a portable music device with wireless connectivity and we’re using the TAS2563 smart amp. The smart amp will be powering a 4 cm, 5W rated power loudspeaker in combination with a tuned passive membrane for bass extension. So, the TAS2563 runs in mono mode.
I’m in the possession of the TAS2X63 EVM module and the PP-SALB2-EVM module in combination with the Pure Path Software 3. I also have access to an anechoic chamber and a high-quality measurement chain to obtain all relevant loudspeaker data (frequency and impedance response, TSP Data, etc.).
In the process of tuning the smart amp, I’ve encountered some questions and problems:
1. Different EVM version:
I got the warning message, that my EVM have a different version (I got: TAS2X63EVM). But it seems to work anyway. Any sugguestions why I got this message? See picture below:
2. Characterisation: preparation:
I've build up everything as it is described in the preparation window, but it seems that the microphone is never used to determine any parameter. Is that correct in this case? Also, the playback never works in the hardwarecheck.
3. Characterisation: speaker selection:
I can only select a microspeaker (single driver closed box). Why is that so? I suspect that the tas2563 amp is only provided for this purpose, even if it is not stated in the datasheet (revision 03.21 of the datasheet). Can someone explain it to me? Because I do not use a microspeaker in a closed box, I use a "normal" speaker in combination with a passive membrane.
4. Characterisation: speaker model:
Works as expectet, the determined TSP data is nearly identical to my own measurement in the housing with passive membrane.
5. Characterisation: thermal measurement:
The characterisation works as expected as far as I can tell. But I don't know if the values are meaningfull, because the verification window shows false values (see below).
6. Smart Amp processing:
With all these evaluated data, the speaker protection seems to be very strict. The loudspeaker is capable of producing more bass without being damaged. How can I "ease up" the protection? I've tried all different examples that are mentioned in the slaa751, slaa857, slaa952 and slaa936a, but the heavy limiting persits.
Also, the evaluated thermal and excursion protection data leads to unrealistic verification data. Thermal data shows allways 255°C, and excursion is allways limited to +-1mm even if the limit is set to +-2mm. Both values are obviously incorect and affecting the peformace. Without the smart amp and connected to a normal amp, the peformance is much better at umax. How do I solve this issue?
I'm out of ideas here and could use some assistance. Thank you.
