TPA2001D1

1-W FILTERLESS MONO CLASS-D AUDIO POWER AMPLIFIER

SLOS338D – SEPTEMBER 2000 – REVISED DECEMBER 2002

10

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 the channel.

To use the TPA2001D1 EVM with a differential source, connect the positive lead of the audio source to the INP

input and the negative lead from the audio source to the INN input. To use the TPA2001D1 with a single-ended

source, ac ground the INN input through a capacitor and apply the audio single to the input. In a single-ended

input application, the INN input should be ac-grounded at the audio source instead of at the device input 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

INP

INN

SHUTDOWN

GAIN0

GAIN1

PVDD

OUTP

PGND

BYPASS

AGND

COSC

ROSC

VDD

PVDD

OUTN

PGND

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

U1

TPA2001D1

C5

1

µF

C6

1

µF

C7

1

µF

C1

220 pF

R1

120 k

Ω

C2

1

µF

C3

1

µF

J1

J2

C4

1

µF

C8

10

µF

R3

120 k

Ω

S1

R2

120 k

Ω

OUT+

VDD

OUT–

IN–

IN+

VDD

R4

120 k

Ω

SHUTDOWN

GND

GND

NOTE: R1, R2, and R3 are used in the EVM but are not required for normal applications.