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TAS2552 class D amp basic questions

Gareth Pont
Prodigy 50 points
Other Parts Discussed in Thread: TAS2552, TPA2025D1

Hi everyone. I'm trying to decide whether the TAS2552 will be suitable for my needs. There are various things that I haven't managed to extract from the data sheet. All help will be gratefully received!

What is the abs max differential Vpp out at the speaker terminals? I can see that the nominal boosted PVDD is 8.5V but I can't see how close to GND and PVDD the outputs will actually swing.

Can I drive AVDD and IOVDD from the same regulated rail or must they be separately regulated?

A related question; must AVDD and IOVDD be separately sequenced and if so, what is the minumum delay?

Can the TAS2552 be operated autonomously without a processor/I2C connection? If so what are the default gain and ILIM settings etc? The datasheet suggests thatthe I2C is needed for active current/AGC control but what if I don't need that? My application delivers a fixed amplitude modulated carrier which is simply switched on and off.

Is the ILIM a cycle by cycle limit in the boost converter or is it effectively a DC current limit feeding the output stage?

Thanks, Gareth

  • 0
    TI__Guru 54096 points

    The TAS2552 is a class-D amp therefore both outputs switch between zero V and VBOOST (8.5V). The filtered (analog) signal swings all the way to VBOOST without a load. With a load, it will reduce somewhat (which will result in THD due to the non-linearity. We don't specify the max. swing, we specify the THD+N).

    You can drive AVDD and IOVDD from the same rail. Make sure that AVDD is clean. They should powere up at the same time.

    The TAS2552 requires a controller. It must be configured via I2C.

    ILIM triggers if the current drawn from the output stage exceeds a limit.

    If you don't need Isense, an alternative would be the TPA2025D1