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TPA2080D1 Scheda tecnica(PDF) 11 Page - Texas Instruments |
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TPA2080D1 Scheda tecnica(HTML) 11 Page - Texas Instruments |
11 / 22 page 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 Submit Documentation Feedback 11 Product Folder Links: TPA2080D1 |
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