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TPA2080D1 Folha de dados(PDF) 11 Page - Texas Instruments

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Nome de Peças TPA2080D1
Descrição Electrónicos  2.2 W Constant Output Power Class-D Audio Amplifier with Class-G Boost Converter
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Fabricante Electrônico  TI1 [Texas Instruments]
Página de início  http://www.ti.com
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TPA2080D1 Folha de dados(HTML) 11 Page - Texas Instruments

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TPA2080D1
www.ti.com
SLOS733A – JANUARY 2012 – REVISED OCTOBER 2012
BOOST CONVERTER AUTO PASS THROUGH (APT)
The TPA2080D1 consists of a Class-G boost converter and a Class-D amplifier. The boost converter operates
from the supply voltage, VBAT, and generates a higher output voltage PVDD at 5.75 V. PVDD drives the supply
voltage of the Class-D amplifier. This improves loudness over non-boosted solutions. The boost converter has a
“Pass Through” mode in which it turns off automatically and PVDD is directly connected to VBAT through an
internal bypass switch.
The boost converter is adaptive and operates between pass through mode and boost mode depending on the
output audio signal amplitude. When the audio output amplitude exceeds the “auto pass through” (APT)
threshold, the boost converter is activated automatically and goes to boost mode. The transition time from normal
mode to boost mode is fast enough to prevent clipping large transient audio signals. TPA2080D1’s APT
threshold is fixed at 2 VPEAK. When the audio output signal is below APT threshold, the boost converter is
deactivated and goes to pass through mode. The adaptive boost converter maximizes system efficiency at lower
audio output levels.
The Class-G boost converter is designed to drive the Class-D amplifier only. Do not use the boost converter to
drive external devices.
Figure 20 shows how the adaptive boost converter behaves with a typical audio signal.
spacer
Figure 20. Class-G Boost Converter with Typical Music Playback
Copyright © 2012, Texas Instruments Incorporated
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