Q: TPA3111D1 power consumption question

Hi,

A Customer is using a TPA3111 in single ended mode and has noticed higher power consumption. 

 

1-            Why with only one wire connected to the speaker, it's 360mA and not 180mA? Where is the half of the current?

2-            Do you have another solution or device using the same topology (one speaker wire connected to GND)?

 


A: Re: TPA3111D1 power consumption question

Hi,

First of all. the TPA311X devices were not designed to be used in this configuration. Using these devices with single ended outputs result in very high THD+N (above 1% even with low output power). Let me recommend to you the TPA312X family.

As for the high current you are observing, are you using a DC blocking capacitor at the output? In single ended applications, the DC blocking cap is a must. If it is not used, a large DC current will flow through the speaker and possibly damage it. Please refer to the application schematic in the TPA3125 datasheet or the schematic of the TPA3125EVM which can be found at:

http://focus.ti.com/lit/ug/slou250/slou250.pdf