3 Selecting a TI Audio Amplifier

LRAs, ERMs, and Solenoids typically have DC impedances that fall into the same range as audio speaker impedances: 4Ω - 16Ω. This makes it simple for nearly any Class-D audio amp to drive these loads. To help narrow down which device to select, there are other parameters to consider. Criteria can include but is not limited to the following:

• Number of channels
• Output power per channel
• Supply voltage
• Audio input source (analog or digital)
• Dynamic processing (Equalizer, Compression, and so on.)
• Load Diagnostics

TAS6424E-Q1 is a device that succeeds in this kind of application due to its ability to drive the required actuators as well as the speakers in the vehicle. The common design makes it easy to drive speaker loads and use extra channels to drive the actuators as well: all from the same digital audio bus.

See Table 3-1 for a short selection-guide on hero devices for this application.