TPA2000D2

2-W FILTERLESS STEREO CLASS-D AUDIO POWER AMPLIFIER

SLOS291B – MARCH 2000 – REVISED APRIL 2000

14

POST OFFICE BOX 655303

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 TPA2000D2 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 TPA2000D2 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

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–

TPA2000D2

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.