TPA3251: TPA3251

Hi Andreas,

I have a few questions:

• Are you using the EVM?
  • If not what is the LC filter values you are using? 
• There is no internal DAC in the TPA3251
  • There's a DAC in the TAS3251. Is that the device you are referring to instead? The naming convention is a bit confusing.
• We use resistive loads and not loudspeakers since loud speakers have varying impedances across the different frequencies. Sounds like you have tested it with a loudspeaker. Do you have it's impedance over frequency graph? 

Thanks,

Robert Clifton

• Are you using the EVM?   NO !  Using  " Aiyima A04 - Small Chinese Amplifiers "  
  • If not what is the LC filter values you are using? Using 10 uH and 0.68 uF in a stereo BTL - 04 ohms  
• There is no internal DAC in the TPA3251
  • There's a DAC in the TAS3251. Is that the device you are referring to instead? The naming convention is a bit confusing. I saw in some paper of TI -"High power audio amplifiers" , explaining the working of TPA32XX family ...  i imagine that could be this ... High resolution audio playback 24 bits / 96 KHz the reason ...  
• We use resistive loads and not loudspeakers since loud speakers have varying impedances across the different frequencies. Sounds like you have tested it with a loudspeaker. Do you have it's impedance over frequency graph? Yes ! You are correct . 

Hi Andreas,

Thanks for clarifying the system that you are testing with. If possible, I recommend testing with a purely resistive load and checking the results. As I don't have the schematic, it's possible there might be something else limiting the frequency response of the system. Removing as many variables will help better pinpoint where this limiting factor is coming from. 

I believe I've tested the frequency response using the EVM. I'll check to see if I have any tests to verify this. 

Best Regards,

Robert Clifton 

No response from the OP, I will close this thread.  I can be reopened with a reply.