TS4984 查看數據表（PDF） - STMicroelectronics

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TS4984

2 x 1W Stereo audio power amplifier with active low standby mode

STMicroelectronics 

TS4984

Typical Application

1 Typical Application

Figure 1 shows a schematic view of a typical audio amplification application using the TS4984. Table 1

describes the components used in this typical application.

Figure 1: Typical application schematic

Cfeed-L

Rfeed-L

22k

VCC

Cs

1u

Input L

GND

Cin-L

100n

Rin-L

22k

VCC

1

2

3

Cb

1u

Wire optional

Internal connection

Input R

GND

Cin-R

100n

Rin-R

22k

1

IN-L

-

2

IN+L +

12

Standby Bias

3 Bypass L

10

IN+R +

9

IN-R -

U1

VO-L

16

-

AV = -1

+

VO+L

15

Neg. Output L

Pos. Output L

VO-R

8

11 Bypass R

-

AV = -1

+

VO+R

7

Neg. Output R

Pos. Output R

TS4984

Cfeed-R

Rfeed-R

22k

Table 1: External component descriptions

Components

Functional Description

RIN L,R

CIN L,R

RFEED L,R

CS

CB

AV L, R

Inverting input resistors which sets the closed loop gain in conjunction with Rfeed. These resistors

also form a high pass filter with CIN (fc = 1 / (2 x Pi x RIN x CIN)).

Input coupling capacitors which blocks the DC voltage at the amplifier input terminal.

Feedback resistors which sets the closed loop gain in conjunction with RIN.

Supply Bypass capacitor which provides power supply filtering.

Bypass pin capacitor which provides half supply filtering.

Closed loop gain in BTL configuration = 2 x (RFEED / RIN) on each channel.

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