TPA2025D1: Input Noise When Playing Sound

Hello Allan, 

Our team is looking into this thread and will respond as soon as possible. 

Best Regards, 

Justin Beigel

Hi Justin,

Do you have any comments?

Regards,

Allan

Hello Allan, 

We are still looking into this but should have feedback for you by the end of the week. 

Best Regards, 

Justin Beigel

Hello Allan, 

Based on the schematic, we recommend increasing the voltage rating on the capacitors for the PVDD and VBAT rails. For audio devices, we recommend a 5x rail voltage for capacitor ratings. For example, a 5V rail would need a 25V rated capacitor. 

As for the noise, is the signal in the oscilloscope capture the VBAT supply? If so, can you use a bench supply to power the device and see if you have the same issue? 

Thank you, 

Justin Beigel

Hi Justin,

Customer has tried below test but result is still not good. Do you have any other suggestions? 

1. Remove R9472, use external supply, they still see ~500mV ripple noise on VBAT

2. with R9472, add one 100uF/16V ecap + one 22uF/16V ceramic cap on VBAT, ripple decrease to ~450mV. They will try 25V cap. 

3. R9472 change to 600ohm bead, add one 22uF/16V ceramic cap on VBAT, ripple decrease to ~350mV.

Regards,

Allan

Hello Allan, 

Thank you for the additional information. I need to double check something with a colleague but will have feedback for you soon. 

Best Regards, 

Justin Beigel

Hi Allan,

I'm following up on your email thread.

Best regards,
-Ivan Salazar
Applications Engineer

Do you have any suggestion on this topic ?