TS4972(2003) 데이터 시트보기 (PDF) - STMicroelectronics

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TS4972
(Rev.:2003)

1.2W AUDIO POWER AMPLIFIER WITH STANDBY MODE ACTIVE HIGH

STMicroelectronics 

TS4972

ELECTRICAL CHARACTERISTICS

VCC = 2.6V, GND = 0V, Tamb = 25°C (unless otherwise specified)

Symbol

Parameter

Min. Typ.

ICC

Supply Current

No input signal, no load

5.5

ISTANDBY

Standby Current 1)

No input signal, Vstdby = Vcc, RL = 8Ω

10

Voo

Output Offset Voltage

No input signal, RL = 8Ω

5

Po

Output Power

THD = 1% Max, f = 1kHz, RL = 8Ω

300

THD + N

Total Harmonic Distortion + Noise

Po = 200mW rms, Gv = 2, 20Hz < f < 20kHz, RL = 8Ω

0.1

PSRR Power Supply Rejection Ratio2)

75

f = 217Hz, RL = 8Ω, RFeed = 22KΩ, Vripple = 200mV rms

ΦM

Phase Margin at Unity Gain

RL = 8Ω, CL = 500pF

70

Gain Margin

GM

RL = 8Ω, CL = 500pF

20

Gain Bandwidth Product

GBP

RL = 8Ω

2

1. Standby mode is actived when Vstdby is tied to Vcc

2. Dynamic measurements - 20*log(rms(Vout)/rms(Vripple)). Vripple is an added sinus signal to Vcc @ f = 217Hz

Max. Unit

8

mA

1000

nA

20

mV

mW

%

dB

Degrees

dB

MHz

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-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.

4/28

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