TS4990 datasheet(4/32 Pages) STMICROELECTRONICS

Numer części	TS4990

Szczegółowy opis	1.2 W audio power amplifier with active low standby mode

PDF	32 Pages

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Producent	STMICROELECTRONICS [STMicroelectronics]

Strona internetowa	http://www.st.com

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4 / 32 page

Typical application schematics

TS4990

4/32

Typical application schematics

Figure 1.

Typical application schematics

Table 3.

Component descriptions

Component

Functional description

Rin

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)).

Cin

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

Rfeed

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.

Cfeed

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).

Exposed pad

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

information on page 28 for more information.

Rfeed

Rin

Audio In

Cfeed

Vcc

Cin

Standby

Control

Speaker

8Ohms

Bias

AV = -1

Vin-

Vin+

Bypass

Standby

Vout 1

Vout 2

TS4990

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