The TAS576xM PurePath Smart Amp enhance the bass, sound fidelity and increased loudness by driving the speaker to its thermal and mechanical limits.
The TAS576xM contains two BTL class-D amplifiers that supply up to 2 x 50W peak power into 4 Ω. The amplifier is thermally designed to match the typical speaker so it can withstand high peaks for the time it takes the speaker voice-coil to heat up; it then lowers the average power to safe operating limits.
The wide supply range of 4.5 V to 26.4 V enables the use of different power supply options from 2-cell Li-Ion batteries to fixed 24-V supply.
The Smart Amp is available with two different class-D amplifier modulations: BD-mode in the TAS5766M; and, 1SPW-mode in the TAS5768M.
TI's PurePath Smart Amp technology allows speakers to be driven with more peak power than their average-power rating, without damage to the speaker by voice coil over excursion or thermal overload.
Sophisticated speaker models (electro-mechanical-thermal) are used as a foundation for the protection and enhancement of the system. This is done by modeling the loudspeaker in the on-chip miniDSP and running an adaptive algorithm that modifies the output based on the modeled conditions of the speaker.
TI provides a PurePath Console (PPC) GUI, including a TI learning board that measures the loudspeaker parameters. The PPC GUI generates the code for download to the device on boot-up.
Smart Amp technology in the TAS576xM uses information from the SOA (Safe Operating Area) characterization details for the loudspeaker, as well as real-world temperature, and uses this data in an adaptive control algorithm in order to control Smart Bass and Smart DRP (Dynamic Range Preservation). The protection side of the algorithm is also used for thermal protection and mechanical voice coil excursion protection.