13 Device and Documentation Support

13.1 Device Support

13.1.1 Device Nomenclature

13.1.1.1 TPA2015D1 Glossary

Limiter level

The maximum output voltage allowed before amplifier gain is automatically reduced.

SpeakerGuard™

TI's trademark name for the automatic gain control technology. It protects speakers by limiting maximum output

power.

Inflection point

The battery voltage threshold for reducing the limiter level. If the battery voltage drops below the inflection point,

the limiter level automatically reduces. Although it lowers the maximum output power, it prevents high battery

currents at end-of-charge low battery voltages.

Battery track

The name for the continuous limiter level reduction at battery voltages below the inflection point.

AGC

Automatic gain control.

VBAT

The battery supply voltage to the TPA2015D1. The VBAT pin is the input to the boost converter.

Fixed-gain

The nominal audio gain as set by the GAIN pin. If the audio output voltage remains below the limiter level, the

amplifier gain will return to the fixed-gain.

Attack time

The rate of AGC gain decrease. The attack time is constant at 0.026 ms/dB.

Release time

The rate of AGC gain increase. The release time is constant at 1600 ms/dB.

13.1.1.2 Boost Terms

C

Minimum boost capacitance required for a given ripple voltage on PVOUT.

L

Boost inductor.

Switching frequency of the boost converter.

Current pulled by the Class-D amplifier from the boost converter.

Average current through the boost inductor.

PVDD

(PVOUT)

Supply voltage for the Class-D amplifier. (Voltage generated by the boost converter output.)

VBAT

Supply voltage to the IC.

Ripple current through the inductor.

ΔV

Ripple voltage on PVOUT.

TPA2015D1

SLOS638C – NOVEMBER 2011 – REVISED JUNE 2022

www.ti.com

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