TS4871 ST Microelectronics, Inc., TS4871 Datasheet - Page 4

• Manufacturer Part Number: TS4871
• Description: 1W Mono Audio Amplifier With Standby Active High
• Manufacturer: ST Microelectronics, Inc.

TS4871
ELECTRICAL CHARACTERISTICS
V
1. Standby mode is actived when Vstdby is tied to Vcc
2. Dynamic measurements - 20*log(rms(Vout)/rms(Vripple)). Vripple is the surimposed sinus signal to Vcc @ f = 217Hz
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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Components
CC
THD + N
Symbol
I
STANDBY
PSRR
GBP
Voo
= 2.6V, GND = 0V, T
GM
Rfeed
Cfeed
I
Po
Rstb
CC
Rin
Cin
Cs
Cb
Gv
M
Supply Current
Standby Current
Output Offset Voltage
Output Power
Total Harmonic Distortion + Noise
Power Supply Rejection Ratio
Phase Margin at Unity Gain
Gain Margin
Gain Bandwidth Product
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
Pull-up resistor which fixes the right supply level on the standby pin
Closed loop gain in BTL configuration = 2 x (Rfeed / Rin)
(low pass filter cut-off frequency 1 / (2 x Pi x Rfeed x Cfeed))
R
R
R
No input signal, no load
No input signal, Vstdby = Vcc, RL = 8
No input signal, RL = 8
THD = 1% Max, f = 1kHz, RL = 8
Po = 200mW rms, Gv = 2, 20Hz < f < 20kHz, RL = 8
f = 217Hz, RL = 8
L
L
L
= 8 , C
= 8 , C
= 8
amb
L
L
1)
= 500pF
= 500pF
= 25°C (unless otherwise specified)
Parameter
RFeed = 22K
2)
Functional Description
Vripple = 200mV rms
Min.
Typ.
0.15
260
5.5
10
75
70
20
5
2
Max.
1000
20
8
Degrees
MHz
Unit
mW
mA
mV
nA
dB
dB
%