TS4984

Application Information

24/29

4.9 Application example: Differential-input BTL power stereo amplifier

The schematic in Figure 69 shows how to design the TS4984 to work in differential-input mode. For this

discussion, only the left-channel amplifier will be referred to.

Let:

The gain of the amplifier is:

maximum.

Figure 69: Differential input amplifier configuration

Gvdif = 2

R2

R1

-------

×

R1L

CinL

R2L

VCC

Cs

Cb

Neg. Input LEFT

8 Ohms

LEFT Speaker

8 Ohms

RIGHT Speaker

R1R

CinR

R2R

Neg. Input RIGHT

StandBy

Control

R1L

CinL

Pos. Input LEFT

R1R

CinR

Pos. Input RIGHT

R2L

R2R

Bias

StandBy

BypassL

VO-L

VO+L

VO-R

VO+R

IN-L

IN+L

IN+R

IN-R

+

-

+

-

+

-

AV = -1

+

-

AV = -1

BypassR

TS4984