TS4962_10 Datasheet, PDF (33/44 Pages) STMicroelectronics – 2.8 W filter-free mono class D audio power amplifier

TS4962
Application information
4.9
Single-ended input configuration
It is possible to use the TS4962 in a single-ended input configuration. However, input
coupling capacitors are needed in this configuration. Figure 61 shows a typical single-ended
input application.
Figure 61. Single-ended input typical application
Ve
GND
Standby
Cin _Rin
Rin
Cin
GND
1 ^Stdby Internal
Bias
150k
4
-
In-
In+ ₊
3
PWM
150k
Oscillator
Vcc
6
Cs
Vcc
1u
Out+
5
Output
H
Bridge
8
Out-
GND
SPEAKER
GND
7
GND
All formulas are identical except for the gain with R_in in kΩ.
A_{V single}
=
-------------^V----^e-------------
Out⁺ – Out^-
=
-³---⁰---⁰--
R_in
Due to the internal resistor tolerance we have:
2_----7_---3_--
R_in
≤
A_{V single}
≤
3_----2_---7_--
R_in
In the event that multiple single-ended inputs are summed, it is important that the
impedance on both TS4962 inputs (In^- and In⁺) be equal.
Figure 62.
Typical application schematic with multiple single-ended inputs
Vek
GND
Ve1
Standby
Cink _Rink
Cin1 _Rin1
GND
Req
Ceq
GND
1 ^Stdby Internal
Bias
150k
4_-
In-
In+ ₊
3
PWM
150k
Oscillator
Vcc
6
Cs
Vcc
1u
Out+
5
Output
H
Bridge
8
Out-
GND
SPEAKER
GND
7
GND
Doc ID 10968 Rev 8
33/44