TS4990EIJT 查看數據表（PDF） - STMicroelectronics

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TS4990EIJT

1.2 W audio power amplifier with active low standby mode

STMicroelectronics 

Typical application schematics

2

Typical application schematics

Figure 1. Typical application schematics

Rfeed

Cfeed

Vcc

Audio In Cin Rin

Vin-

-

Vin+

+

TS4990

Cs

Vout 1

Speaker

8 Ohms

Standby

Control

Cb

Bypass

Standby

Bias

-

AV = -1

+

Vout 2

TS4990

Table 3. Component descriptions

Component

Functional description

Rin

Cin

Rfeed

Cs

Cb

Cfeed

AV

Exposed pad

Inverting input resistor that sets the closed loop gain in conjunction with Rfeed. This

resistor also forms a high pass filter with Cin (Fc = 1 / (2 x Pi x Rin x Cin)).

Input coupling capacitor that blocks the DC voltage at the amplifier input terminal.

Feed back resistor that sets the closed loop gain in conjunction with Rin.

Supply bypass capacitor that provides power supply filtering.

Bypass pin capacitor that provides half supply filtering.

Low pass filter capacitor allowing to cut the high frequency (low pass filter cut-off

frequency 1/ (2 x Pi x Rfeed x Cfeed)).

Closed loop gain in BTL configuration = 2 x (Rfeed / Rin).

DFN8 exposed pad is electrically connected to pin 7. See DFN8 package

information on page 28 for more information.

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