Protection for the TPA3116D2

[fabiodl]

I am building an amp based on the TPA3116D2.
I read that if I forget to attach the speaker / 1 wire slips away, there's danger of the LC filter enter resonance and fry the chip/capacitors.
I saw some protections done by attaching two diodes, which lock the output of the filters inside the  voltage rail (+Vf).
I have two questions though.
With reference to this schematic http://www.ti.com/lit/ug/slou336b/slou336b.pdf
Are right- and left- usually above ground?  Or does the TPA3116D2 usually push right- and left- at negative voltages?
The power supply can be as low as 5v. Does it mean that the chip can act as a "boost" converter?

If the answer to any of these two questions is "yes", then I guess the diode protection I saw is unusable / impacts the performance (the second is less critical if the supply is high)

[Zero999]

You need to refer to the TPA3116D2 data sheet to answer those questions.
http://www.ti.com/lit/ds/symlink/tpa3116d2.pdf

The output voltages from the TPA3116D2, to the speakers are always within the supply rails. Look at the internal schematic. Each output stage is simply a pair of MOSFETs, connected to either power supply rail. The only voltage, above the supply, is the gate drive to the high side N-MOSFETs. It enables the high side MOSFETs to turn fully on, connecting the output to the positive rail. The average voltage on each output will be half the supply voltage.

[Prehistoricman]

I read that if I forget to attach the speaker / 1 wire slips away, there's danger of the LC filter enter resonance and fry the chip/capacitors.

Personally, I wouldn't worry about it. You could add a light load (kilo-ohms) to be permanently attached if you're scared.

Are right- and left- usually above ground?  Or does the TPA3116D2 usually push right- and left- at negative voltages?

All of the outputs will idle at half the supply voltage. This is known as a bridged amplifier configuration. Two single-ended amplifiers are used to drive the same load.
These TI chips can usually go parallel-bridge as well, which is using the two bridged amplifiers driving the same load.

The power supply can be as low as 5v. Does it mean that the chip can act as a "boost" converter?

The opposite. Class D amplifiers are essentially buck converters.

[fabiodl]

Thank you Zero999 and Prehistoricman, anything is clear now!