TS4890 查看數據表（PDF） - STMicroelectronics

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TS4890

RAIL TO RAIL OUTPUT 1W AUDIO POWER AMPLIFIER WITH STANDBY MODE ACTIVE LOW

STMicroelectronics 

TS4890

Components

Functional Description

Rin

Cin

Rfeed

Cs

Cb

Cfeed

Rstb

Gv

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))

Input coupling capacitor which blocks the DC voltage at the amplifier input terminal

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-down 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.

1. External resistors are not needed for having better stability when supply @ Vcc down to 3V. The

quiescent current still remains the same.

2. The standby response time is about 1µs.

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