TPA0213

2-W MONO AUDIO POWER AMPLIFIER

WITH HEADPHONE DRIVE

SLOS276D – JANUARY 2000 – REVISED NOVEMBER 2002

9

POST OFFICE BOX 655303

TYPICAL CHARACTERISTICS

–60

–100

–120

0

–20

20

100

1k

10k 20k

f – Frequency – Hz

POWER SUPPLY REJECTION RATIO

vs

FREQUENCY

CB = 0.47 µF

–40

–80

VDD = 5 V

Stereo/SE

Gain = 1.9 dB

CB = 1 µF

Bypass = 2.5 V

Figure 13

APPLICATION INFORMATION

gain setting via input resistance

The gain of the input stage is set by the user-selected input resistor and a 50-k

Ω internal feedback resistor.

However, the power stage is internally configured with a gain of –1.25 V/V in SE mode, and –2.5 V/V in BTL

the overall gain can be calculated using equations (1) and (2).

(1)

A

V +

–125 k

W

R

I

(BTL)

(2)

A

V +

–62.5 k

W

R

I

(SE)

The –3 dB frequency can be calculated using equation 3:

(3)

ƒ

–3dB +

1

2

p R

I

C

i

If the filter must be more accurate, the value of the capacitor should be increased while the value of the resistor

to ground should be decreased. In addition, the order of the filter could be increased.