TS4962M_07 Datasheet, PDF (33/41 Pages) STMicroelectronics – 3W filter-free class D audio power amplifier

TS4962M
Application information
In the case where the distance between the TS4962M outputs and speaker terminals is
high, it is possible to have low frequency EMI issues due to the fact that the typical operating
frequency is 250kHz. In this configuration, we recommend using an output filter (as shown
in Figure 1: Typical application schematics on page 4). It should be placed as close as
possible to the device.
5.11 Different examples with summed inputs
Example 1: Dual differential inputs
Figure 64. Typical application schematic with dual differential inputs
Vcc
Standby
B1
B2
Cs
Vcc
1u
C2 ^Stdby Internal
R2
Bias
E2+
150k
Out+ GND
C3
R1
E1+
C1 _-
In-
E1-
In+ ₊
A1
R1
E2-
150k
PWM
Output
H
Bridge
A3
Out-
SPEAKER
R2
Oscillator
GND
TS4962
A2
B3
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_-----1----×_------R_{----2----+-----}3_---0_----0_-----×_-----(_---V_{----I--C---1-----}×_-----R_{-----2----+-----}V_{----I--C----2----}×_-----R_-----1---)
300 × (R₁ + R₂) + 2 × R₁ × R₂
≤
V_CC
–
0.8V
V_IC1
=
-^E----¹---⁺----+-----^E----¹---^-
2
and
V_IC2
=
E_-----2---⁺_----+-----E_----2---^-
2
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