TS4984 Datasheet, PDF (25/29 Pages) STMicroelectronics – 2 x 1W Stereo audio power amplifier with active low standby mode

Application Information
TS4984
The value of the input capacitor C_IN can be calculated with the following formula, using the -3dB lower
frequency required (where F_L is the lower frequency required):
C _IN
≈
1
2 π R₁ F_L
(F)
Note:
This formula is true only if:
F_CB
=
1
2 π (R₁ + R ₂ ) C_B
(Hz )
is 5 times lower than F_L.
The following bill of materials is provided as an example of a differential amplifier with a gain of 2 and a
-3 dB lower cut-off frequency of about 80 Hz.
Table 7: Example of a bill of material
Designator
R_1L = R_1R
R_2L = R_2R
C_inR = C_inL
C_b=C_S
U1
Part Type
20kΩ / 1%
20kΩ / 1%
100nF
1µF
TS4984
25/29