TAS2118EVM: TAS2118 EVM Shut-down Issue at 2A

Hey Guande, 

Describe the situation a little bit more. 

You mentioned the EVM "shunts down" once VBAT reaches 2A. I would like to clarify if you get an output, increase the gain and then device goes into hi-z mode ?

or

you've set up the device in playback expecting audio out and instead you only see hi-z and no audio output is generated in the first place?

Regards,

Ore

Hi Ore,

Thanks for your prompt reply. Let me provide more details about our test scenario:

• Objective: The purpose of this experiment is to determine the optimal capacitance value for the product's power capacitor.
• Load: A 4-ohm speaker.
• Power Source: A 7.5W adapter.
• Observed Phenomenon: When playing a white noise audio file, increasing the gain to an output of 3W or more causes the Tas2118 EVM to shut down, stopping audio playback. (The LED on the EVM remains lit, and a reset is required to resume operation.)

We suspect this is triggered by another protection mechanism, not an insufficient adapter, as the same phenomenon occurs when using a power supply. We've also adjusted the PPC3's peak current limit to 5.1A, but the issue persists.

Expected Phenomenon: We anticipate that when playing at 4W or higher, the 7.5W adapter's protection will be triggered, resulting in audio cutoff. At that point, we plan to experiment with a larger capacitor.

Thanks.

Guande