TDA7298 Datasheet, PDF (4/11 Pages) STMicroelectronics – 28W Hi-Fi AUDIO POWER AMPLIFIER WITH MUTE / STAND-BY

TDA7298
APPLICATIONS SUGGESTIONS (See Test and Application Circuit)
The recommended values of the external components are those shown on the application circuit. Differ-
ent values can be used; the following table can help the designer.
Comp.
R1
R2
R3
R4
R5
R6
C1
Value
22KΩ (*)
560Ω
22KΩ (*)
22KΩ (*)
22KΩ
4.7Ω
1µF
Purpose
Input Impedance
Closed Loop Gain set to
32dB (**)
Input Impedance @ Mute
Stand-by Time Constant
Frequency Stability
Input DC Decoupling
Larger Than
Increase of Input
Impedance
Decrease of Gain
Increase of Gain
Danger of oscillations
C2
10µF
Feedback DC Decoupling
C3
C4
C5, C6
10µF
0.100µF
1000µF
Stand-by Time Constant
Frequency Stability
Supply Voltage Bypass
(*) R1 = R3 = R4 for POP optimization
(**) Closed Loop Gain has to be ≥ 30dB
Smaller Than
Decrease of Input
Impedance
Increase of Gain
Decrease of Gain
Danger of oscillations
Higher Low-frequency
cut-off
Higher Low-frequency
cut-off
Danger of Oscillations
TYPICAL CHARACTERISTICS
Figure 1: Output Power vs. Supply Voltage
Figure 2: Distortion vs. Output Power
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