TDA2004A
Figure 17 :
Total Power Dissipation and
Efficiency vs. Output Power .
APPLICATION SUGGESTION
The recommended values of the componentsare those shown on application circuit of fig.1. Different values
can be used ; the following table can help the designer.
Component
R1
R2, R4
R3, R5
R6, R7
Recomm. Value
120KΩ
1KΩ
3.3Ω
1Ω
Purpose
Larger Than
Smaller Than
Smaller P
O
max.
Decrease of gain
Increase of gain
Optimization of the
Smaller P
O
max.
output signal simmetry
Close loop gain
setting (*)
Frequency stability
Increase of gain
Decrease of gain
Danger of oscillation
at high frequency with
inductive load
High turn-on delay
High turn-on pop
Higher low frequency
cutoff. Increase of
noise
C1, C2
2.2µF
Input DC decoupling
C3
10µF
Ripple Rejection
Increase of SVR.
Degradation of SVR.
Increase of the switch-
on time.
Increase of distortion
at low frequency
C4, C6
C5, C7
C8, C9
C10, C11
100µF
100µF
0.1µF
1000µF to 2200µF
Boostrapping
Feedback Input DC
decoupling.
Frequency Stability
Output DC decoupling.
Danger of oscillation.
Higher low-frequency
cut-off.
(*) The closed–loop gain must be higher than 26dB.
7/10
STMICROELECTRONICS [ STMICROELECTRONICS ]
