This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TPA3100D2 SYNC Operation

Other Parts Discussed in Thread: TPA3100D2, TPA3101D2

The TPA3100D2, TPA3101D2, and TPA3106D2 have SYNC terminals which allow the internal oscillator to be sync'd up with a second device, or your SMPS.

 

The data sheet describes how to use this, but it is not very clear on the external frequency allowed, or what happens if your SYNC signal goes away.

 

The internal oscillator and circuits are only designed to operate from 200 kHz to 300 kHz, so if you try to input a SYNC signal outside that range, your audio performance will be negatively impacted (quite severely).

 

If you have a device set up to receive the SYNC signal and it goes away, the TPA310xDy will drop the switching frequency to around 100 kHz, and the THD will go up substantially. The good news is, there is no obnoxious sounds generated when I tried this in the lab.

 

If this is a common occurance in your system, we discussed a circuit could be designed to throw it back into MASTER mode when the clock went away.

 

Do you find the MASTER/SLAVE-z and SYNC functionality useful? It takes up several pins which could be used for more interesting features, like, maybe clip detect? Thermal warning? What?

 

-d2