TDA7493 STMicroelectronics, TDA7493 Datasheet - Page 16

• Manufacturer Part Number: TDA7493
• Description: Audio Amplifiers 3W + 3W Dual BTL Class-D 4-Select dB
• Manufacturer: STMicroelectronics

Specifications of TDA7493

• Amplifier Class: D
• No. Of Channels: 2
• Output Power: 3W
• Supply Voltage Range: 3V To 5.5V
• Thd + N: 0.05% @ 0.5W, 4ohm, VCC=5V
• Load Impedance: 4ohm
• Operating Temperature Range: 0°C To +70°C
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Application information
5.6
16/30
Output low-pass filter
To avoid EMI problems, a low-pass filter can be inserted before the speaker. The cut-off
frequency of the filter should be higher than 22 kHz and much lower than the switching
frequency.
The component values of the filter vary according to the speaker impedance.
A typical LC output filter for a speaker impedance of 8 Ω and with a cut-off frequency of
27 kHz is shown in
Figure 9.
A similar filter for a speaker impedance of 4 Ω and also with a cut-off frequency of 27 kHz is
shown in
Figure 10. Typical LC filter for 4 Ω speaker
OUTN
OUTN
OUTP
OUTP
Figure
Typical LC filter for 8 Ω speaker
10:
Figure
9.
20 Ω
330 pF
20 Ω
330 pF
Doc ID 14570 Rev 5
15 µH
33 µH
33 µH
15 µH
0.47 µF
0.47 µF
0.22 µF
0.10 µF
0.10 µF
0.22 µF
8 Ω
4 Ω
TDA7493