TS4871ID STMicroelectronics, TS4871ID Datasheet - Page 23

• Manufacturer Part Number: TS4871ID
• Description: IC AMP AUDIO PWR 1W MONO 8SOIC
• Manufacturer: STMicroelectronics
• Type: Class ABr

Specifications of TS4871ID

• Output Type: 1-Channel (Mono)
• Max Output Power X Channels @ Load: 1W x 1 @ 8 Ohm
• Voltage - Supply: 2.5 V ~ 5.5 V
• Features: Depop, Standby, Thermal Protection
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Operational Class: Class-AB
• Audio Amplifier Output Configuration: 1-Channel Mono
• Output Power (typ): 1x1@8OhmW
• Audio Amplifier Function: Speaker
• Total Harmonic Distortion: 0.15@8Ohm@250mW%
• Single Supply Voltage (typ): 3/5V
• Dual Supply Voltage (typ): Not RequiredV
• Supply Current (max): 8@5VmA
• Power Supply Requirement: Single
• Unity Gain Bandwidth Product (typ): 2MHz
• Rail/rail I/o Type: Rail to Rail Output
• Power Supply Rejection Ratio: 75dB
• Single Supply Voltage (min): 2.5V
• Single Supply Voltage (max): 5.5V
• Dual Supply Voltage (min): Not RequiredV
• Dual Supply Voltage (max): Not RequiredV
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 8
• Package Type: SOIC
• Product: Class-A
• Output Power: 1 W
• Thd Plus Noise: 0.15 %
• Operating Supply Voltage: 3 V, 5 V
• Supply Current: 6 mA
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Audio Load Resistance: 8 Ohms
• Input Offset Voltage: - 0.3 V to + 0.3 V
• Input Signal Type: Single
• Minimum Operating Temperature: - 40 C
• Output Signal Type: Differential
• Supply Type: Single
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2.5 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-2290-5

which gives 16Hz.
In Higher frequency we want 20kHz (-3dB cut off
frequency). The Gain Bandwidth Product of the
TS4871 is 2MHz typical and doesn’t change when
the amplifier delivers power into the load.
The first amplifier has a gain of:
and the theoretical value of the -3dB cut-off higher
frequency is 2MHz/3 = 660kHz.
We can keep this value or limit the bandwidth by
adding a capacitor Cfeed, in parallel on Rfeed.
Then:
So, we could use for Cfeed a 220pF capacitor
value that gives 24kHz.
Now, we can calculate the value of Cb with the
formula b = 50k xCb >> in = (Rin+Rfeed)xCin
which permits to reduce the pop and click effects.
Then Cb >> 0.8µF.
We can choose for Cb a normalized value of 2.2µF
that gives good results in THD+N and PSRR.
In the following tables, you could find three
another examples with values required for the
demoboard.
Remark : components with (*) marking are
optional.
C
C
FE E D
IN
=
=
----------------------------- - = 795nF
2
-------------------------------------- - = 265pF
2
Rfee d
----------------- = 3
RinF
R in
1
R
F E E D
1
C L
F
C H
Application n°1 : 20Hz to 20kHz bandwidth and
6dB gain BTL power amplifier.
Components :
Application n°2 : 20Hz to 20kHz bandwidth and
20dB gain BTL power amplifier.
Components :
R1
R4
R6
R7
R8*
C5
C6
C7
C9
C10
C12
S1, S2, S6, S7
S8
P1
D1*
U1
R1
R4
R6
R7
R8*
C5
C6
C7
Designator
Designator
22k / 0.125W
22k / 0.125W
Short Cicuit
330k / 0.125W
(Vcc-Vf_led)/If_led
470nF
100µF
100nF
Short Circuit
Short Circuit
1µF
2mm insulated Plug
10.16mm pitch
3 pts connector 2.54mm
pitch
PCB Phono Jack
Led 3mm
TS4871ID or TS4871IS
110k / 0.125W
22k / 0.125W
Short Cicuit
330k / 0.125W
(Vcc-Vf_led)/If_led
470nF
100µF
100nF
Part Type
Part Type
TS4871
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