TS4962_10 Datasheet, PDF (35/44 Pages) STMicroelectronics – 2.8 W filter-free mono class D audio power amplifier

TS4962
Application information
In the case where the distance between the TS4962 output and the speaker terminals is
high, it is possible to observe low frequency EMI issues due to the fact that the typical
operating frequency is 250 kHz. In this configuration, we recommend using an output filter
(as represented in Figure 1 on page 6). It should be placed as close as possible to the
device.
4.11
4.11.1
Several examples with summed inputs
Example 1: dual differential inputs
Figure 64. Typical application schematic with dual differential inputs
Vcc
Standby
R2
E2+
R1
E1+
E1-
R1
E2-
R2
1 ^Stdby Internal
Bias
150k
4
-
In-
In+ ₊
3
PWM
150k
Oscillator
6
Cs
Vcc
1u
Out+
5
Output
H
Bridge
8
Out-
GND
SPEAKER
GND
7
GND
With (R_i in kΩ):
A_V1
=
-^O-----^u---^t--⁺----–-----^O-----^u----^t-^-
E₁₊ – E_1-
=
3_----0_---0_--
R₁
A_V2
=
-^O-----^u---^t--⁺----–-----^O-----^u----^t-^-
E₂₊ – E_2-
=
3_----0_---0_--
R₂
0.5V ≤ ^V-----^C---^C-----^×------^R-----¹₃---₀-^×---₀---^R--_×--²---₍-+--_R---³-₁--⁰--+--⁰---_R--^×---₂--⁽-₎--^V-+---^I--^C₂---¹--_×---^×---_R--^R--₁---²--_×--+---_R--^V---₂-^I--^C----²----^×-----^R-----¹---⁾ ≤ V_CC – 0.8V
V_IC1
=
-^E----¹---⁺----+-----^E----¹---^-
2
and
V_IC2
=
-^E----²---⁺----+-----^E----²---^-
2
Doc ID 10968 Rev 8
35/44