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TPA2001D2PWPR Folha de dados(PDF) 10 Page - Texas Instruments |
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TPA2001D2PWPR Folha de dados(HTML) 10 Page - Texas Instruments |
10 / 14 page TPA2001D2 1-W FILTERLESS STEREO CLASS-D AUDIO POWER AMPLIFIER SLOS292A – MARCH 2000 – REVISED APRIL 2000 10 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION differential input The differential input stage of the amplifier cancels any noise that appears on both input lines of a channel. To use the TPA2001D2 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 TPA2001D2 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 The TPA2001D2 employs a shutdown mode of operation designed to reduce supply current, IDD, to the absolute 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 outputs to mute and the amplifier to enter a low-current state, IDD(SD) = 1 µA. SHUTDOWN should never be 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. evaluation circuit RIN– RIN+ S1 SHUTDOWN LIN– TPA2001D2 U1 C7 220 pF GND 120 k R1 R3 120 k C18 C2 C3 C4 LIN+ GND C17 C1 C6 C5 LOUT– LOUT+ GND C8 10 uF VDD VDD GND ROUT+ GND ROUT– GND R2 120k R4 120 k C19 C20 C21 0.1 µF 0.1 µF 0.1 µF 0.1 µF 0.1 µF 0.1 µF 1 µF 10 µF 0.1 µF 0.1 µF 0.1 µF SHUTDOWN PGND LOUTN GAIN0 LPVDD LINN AGND COSC RINN RPVDD ROUTN PGND PGND LOUTP BYPASS LPVDD LINP VDD ROSC RINP RPVDD GAIN1 ROUTP PGND NOTE: R1, R3, and R4 are used in the EVM but are not required for normal applications. |
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