TPA2000D4

STEREO 2W CLASSD AUDIO POWER AMPLIFIER

WITH STEREO HP AMPLIFIER

SLOS337B − DECEMBER 2000 − REVISED NOVEMBER 2005

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APPLICATION INFORMATION

Increasing the bypass capacitor reduces clicking and popping noise from power on/off and entering and leaving

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differential input

The differential input stage of the amplifier cancels any noise that appears on both input lines of a channel. To

use the TPA2000D4 EVM with a differential source, connect the positive lead of the audio source to the RINP

(LINP) input and the negative lead from the audio source to the RINN (LINN) input. To use the TPA2000D4 with

a single-ended source, ac ground the RINN and LINN inputs through a capacitor and apply the audio single to

the RINP and LINP inputs. In a single-ended input application, the RINN and LINN inputs should be ac-grounded

at the audio source instead of at the device inputs for best noise performance.

shutdown modes

minimum level during periods of nonuse for battery-power conservation. The SHUTDOWN input terminal

should be held high during normal operation when the amplifier is in use. Pulling SHUTDOWN low causes the

left unconnected because amplifier operation would be unpredictable.

using low-ESR capacitors

Low-ESR capacitors are recommended throughout this application section. A real (as opposed to ideal)

capacitor can be modeled simply as a resistor in series with an ideal capacitor. The voltage drop across this

resistor minimizes the beneficial effects of the capacitor in the circuit. The lower the equivalent value of this

resistance the more the real capacitor behaves like an ideal capacitor.