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TPA2015D1YZHR Datasheet(PDF) 11 Page - Texas Instruments |
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TPA2015D1YZHR Datasheet(HTML) 11 Page - Texas Instruments |
11 / 25 page TPA2015D1 www.ti.com SLOS638 – MAY 2010 GLOSSARY The application section uses the following terms: 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. SPEAKERGUARD™ THEORY OF OPERATION SpeakerGuard™ protects speakers, improves loudness, and limits peak supply current. If the output audio signal exceeds the limiter level, then SpeakerGuard™ decreases amplifier gain. The rate of gain decrease, the attack time, is fixed at 0.026 ms/dB. SpeakerGuard™ increases the gain once the output audio signal is below the limiter level. The rate of gain increase, the release time, is fixed at 1600 ms/dB. Figure 21 shows this relationship. Copyright © 2010, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Link(s): TPA2015D1 |
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