參數(shù)資料
型號(hào)： TPA2015D1YZHT
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 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)： 4/27頁(yè)
文件大?。?/td> 1016K
代理商： TPA2015D1YZHT
LIMITER
LEVEL
INPUT
SIGNAL
GAIN
OUTPUT
SIGNAL
AttackTime
GainStep
ReleaseTime
Inflectionpoint
LimiterLevel(VBAT>inflectionpoint)
LimiterLevel(VBAT=inflectionpoint)
LimiterLevel
SupplyVoltage
SLOS638 – MAY 2010
www.ti.com
Figure 21. SpeakerGuard Attack and Release Times
BATTERY TRACKING SPEAKERGUARD
The TPA2015D1 monitors the battery voltage and the audio signal, automatically decreasing gain when battery
voltage is low and audio output power is high. It finds the optimal gain to maximize loudness and minimize
battery current, providing louder audio and preventing early shutdown at end-of-charge battery voltages.
SpeakerGuard decreases amplifier gain when the audio signal exceeds the limiter level. The limiter level
automatically decreases when the supply voltage (VBAT) is below the inflection point. Figure 22 shows a plot of
the limiter level as a function of the supply voltage.
Figure 22. Limiter Level vs Supply Voltage
The limiter level decreases within 60 s of the supply voltage dropping below the inflection point. Although this is
slightly slower than the 26 s/dB SpeakerGuard attack time, the difference is audibly imperceptible.
12
Copyright 2010, Texas Instruments Incorporated
Product Folder Link(s): TPA2015D1
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