TS4872(2002) 데이터 시트보기 (PDF) - STMicroelectronics

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TS4872
(Rev.:2002)

RAIL TO RAIL INPUT/OUTPUT 1W AUDIO POWER AMPLIFIER WITH STANDBY MODE

STMicroelectronics 

TS4872

Components

Functional Description

Rin

Inverting input resistor which 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 which blocks the DC voltage at the amplifier input terminal

Rfeed

Cs

Cb

Cfeed

Rstb

Gv

Feed back resistor 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

Low pass filter capacitor allowing to cut the high frequency

(low pass filter cut-off frequency 1 / (2 x Pi x Rfeed x Cfeed))

Pull-up resistor which fixes the right supply level on the standby pin

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

REMARKS

1. All measurements, except PSRR measurements, are made with a supply bypass capacitor Cs = 100µF.

2. External resistors are not needed for having better stability when supply @ Vcc down to 3V. By the

way, the quiescent current remains the same.

3. The standby response time is about 1µs.

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