TPA0232

STEREO 2-W AUDIO POWER AMPLIFIER

WITH DC VOLUME CONTROL AND MUX CONTROL

SLOS286 – NOVEMBER 1999

21

POST OFFICE BOX 655303

APPLICATION INFORMATION

bridged-tied load versus single-ended mode

Figure 33 shows a Class-AB audio power amplifier (APA) in a BTL configuration. The TPA0232 BTL amplifier

consists of two Class-AB amplifiers driving both ends of the load. There are several potential benefits to this

differential drive configuration, but, initially consider power to the load. The differential drive to the speaker

means that as one side is slewing up, the other side is slewing down, and vice versa. This in effect doubles the

voltage swing on the load as compared to a ground referenced load. Plugging 2

equation, where voltage is squared, yields 4

× the output power from the same supply rail and load impedance

(see equation 5).

Power

+

V

(rms)

2

R

L

(5)

V

V

O(PP)

22

RL

2x VO(PP)

VO(PP)

–VO(PP)

VDD

VDD

Figure 33. Bridge-Tied Load Configuration