TAS5713 - Startup sequence

Okay, so what would the correct startup sequence be in that case? The same but without the last part with raising the PVDD?

And a bit of curiosity, what previous data sheet? =)

Thanks,

Erik

Hi Erik:

You don't need to follow the power sequence on PVDD.  It can be up any time after 3.3V is good.  The last data sheet was TAS5711.

Best regards,

Tuan

So the correct startup sequence should be:

1. DVDD power on

2. Set PDN High

Wait 100us

3. Set RESET High

and then start the setup with I2C

Thanks again,

Erik

Between Reset high and writing to I2C registers, there should be a wait ~13.5mS.

Also, please don't forget to turn on PVDD at some point.  PVDD powers on the amplifier section.

Best regards,

Tuan

My experience with the TAS5162 (another Class-D amp) is such that
the DVDD must always come up before the PVDD. If PVDD is powered up
first there will be a large amplitude (>45V, <2uS in my case) spike
which will create a turn-on pop transient in the speakers.
The spike is not concurrent with PVDD ramp-up but instead
concurrent with DVDD ramp-up.

Fortunately for my design both my DVDD and PVDD were under uC
firmware control. This would have been unfortunate if I were using
PVDD to generate DVDD by way of a step-down regulator.

Also, always employ a bleed-off resistor (maybe 150K, 1/2W) in
parallel with the PVDD capacitors. This way if the user turns off
the amp and then turns it on again after <1 minute the residual
charge will not cause a turn-on pop transient.

It seems that somehow the DVDD powered logic circuitry "holds
down" the power MOSFETS in the power bridge circuitry.