Texas Instruments TPA0103 User Manual download pdf (Page 19)

The TPA0103 Audio Power Amplifier Evaluation Module

3-5

Details

Figure 3–4. TPA0103 Amplifier IC

MODE A

MODE B

SHUTDOWN

CNTL

MUX

CNTL

L Line IN

L HP IN

R Line IN

R HP IN

C IN

C OUT+

C OUT–

R OUT+

L OUT+

TPA0103

HP/Line

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.

3.2.2 Output 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

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 31 32

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Texas Instruments TPA0103 User Manual Page 19