Texas Instruments manual ±1. TPA0103 Output Modes

The TPA0103 Audio Power Amplifier Evaluation Module

Figure 3±4. TPA0103 Amplifier IC

C IN

SHUTDOWN MODE A MODE B

R HP IN

R Line IN

HP/Line

L HP IN

L Line IN

TPA0103	C OUT±
	C OUT+
CNTL
MUX	R OUT+
CNTL
MUX	L OUT+

The IC includes three separate amplifier channels: a left and right stereo pair (single-ended) and a bridged-tied load (BTL) center channel. In the BTL mode, the two output lines of the center channel operate 180°out-of-phase with each other for increased power. The center channel speaker load is connected directly across COUT+ and COUT±, and neither line is connected to ground. BTL operation provides many benefits, including quadruple the output power of single-ended operation and no need for bulky output coupling capacitors.

The left and right stereo channels operate in the single-ended mode, the speaker load is connected between the OUT+ terminal through an output coupling capacitor, to system ground. For more information, see the TPA0103 amplifier IC data sheet, TI Literature Number SLOS167.

3.2.2Output Modes

The TPA0103 amplifier operates in any of three output modes or mutes according to the status of the two control terminals MODE A and MODE B as shown in Table 3±1.

Table 3±1. TPA0103 Output Modes

TERMINAL	3-Channel	Mute	Center Only	L/R Only
MODE A	L	H	L	H
MODE B	L	L	H	H

Note: L = logic low, H = logic high

Details 3-5