FEATURES

· Advanced DC Volume Control With 2-dB

Steps

From -40 dB to 20 dB

– Fade Mode

– Maximum Volume Setting for SE Mode

– Adjustable SE Volume Control

Referenced to BTL Volume Control

· 3 W Into 3-W Speakers

· Stereo Input MUX

· Differential Inputs

APPLICATIONS

· Notebook PC

· LCD Monitors ap·

Pocket PC

DESCRIPTION

The TPA6011A4 is a stereo audio power amplifier

that drives 3 W/channel of continuous RMS power

into a 3-W load. Advanced dc volume control

minimizes external components and allows BTL

(speaker) volume control and SE (headphone) vol-

ume control. Notebook and pocket PCs benefit from

the integrated feature set that minimizes external

components without sacrificing functionality.

To simplify design, the speaker volume level is

adjusted by applying a dc voltage to the VOLUME

terminal. Likewise, the delta between speaker volume

and headphone volume can be adjusted by applying

a dc voltage to the SEDIFF terminal. To avoid an

unexpected high volume level through the

headphones, a third terminal, SEMAX, limits the

headphone volume level when a dc voltage is ap·

plied. Finally, to ensure a smooth transition between

active and shutdown modes, a fade mode ramps the

volume up and down.