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| 型號(hào)： | TPA2015D1YZHT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1.7 W, 1 CHANNEL, AUDIO AMPLIFIER, BGA16 |
| 封裝： | 1.954 X 1.954 MM, 0.50 MM PITCH, DSBGA-16 |
| 文件頁(yè)數(shù)： | 3/27頁(yè) |
| 文件大小： | 1016K |
| 代理商： | TPA2015D1YZHT |
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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
11
Product Folder Link(s): TPA2015D1
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