TI中文支持网Part Number:TAS5825M
Hi TI,
(1) When using the TAS5825 EVM with PVDD at 20V, BD mode, and 384kHz switching frequency, we observed that the speaker(2w/4Ω) output voltage after the LC filter is a sine wave centered around PVDD/2
1.Is the LC filter a low-pass filter? What is its cut-off frequency?
2.When subtracting the two PWM signals from OUT1+ and OUT1- of the Class-D amplifier, does the resulting waveform reconstruct the original audio signal?
(2)In our circuit with PVDD at 20V, BD mode, and 384kHz switching frequency, the speaker(2w/4Ω) output only has a ferrite bead (220 ohms @ 100kHz) and a small capacitor of 220 pF. WSPK1 is the speaker connector.
1.If the LC filter is a low-pass filter, but our circuit does not include such an LC filter at all, is this approach still feasible?
2.At OUT_A+ and OUT_A-, we measured the following signals. After subtracting the two waveforms (simulating differential probe measurement), the resulting signal still has a very large amplitude.
3.We’re very concerned that such a large voltage across the speaker(2w/4Ω) might damage it.
4.Although the SmartAmp protects the speaker, is such a high voltage really necessary? It seems to cause the temperature to rise more quickly.
5.In the past, we could only tune audio on your TAS5825 EVM, which was inconvenient. Is it possible to perform real-time tuning directly on the TAS5825M in our device? Please provide support.
6.Since we found that the TAS5825 EVM has an LC filter, which is different from our circuit, and we could only tune audio on the EVM in the past, what problems might occur if we directly apply the tuning settings to our device?
Lydia：
您好，已经收到了您的案例，调查需要些时间，感谢您的耐心等待。
,
Eirwen：
感谢您对TI产品的关注！ 关于您的咨询，我看您在英文E2E与我们的工程师Sydney在沟通。 那这边的帖子我就关闭了。 有疑问请继续与Sydney直接沟通。
