TDA1908 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
TDA1908 Datasheet PDF : 12 Pages
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TDA1908
APPLICATION SUGGESTION
The recommended values of the external components are those shown on the application circuit of fig. 19.
When the supply voltage Vs is less than 10V, a 100Ω resistor must be connected between pin 1 and pin 4
in order to obtain the maximum output power.
Different values can be used. The following table can help the designer.
Component
Raccom.
value
Purpose
R1
10 KΩ Close loop gain
setting
R2
100 Ω Close loop gain
setting.
R3
1 Ω Frequency stability
R4
100 Ω Increaseing of output
swing with low Vs.
C1
2.2 µF Input DC
decoupling.
C2
0,1 µF Supply voltage
bypass.
C3
2.2 µF Inverting input DC
decoupling.
C4
10 µF Ripple Rejection.
C5
47 µF Bootstrap
C6
0.22 µF Frequency stability.
C7
1000 µF Output DC
decoupling.
Larger than
raccomanded value
Smaller than
Allowed range
raccomanded value
Min. Max.
Increase of gain.
Decrease of gain.
9 R2
Increase quiescent
current.
Decrease of gain.
Increase of gain.
R1/9
Danger of oscillation at
hight frequencies with
inductive loads.
47Ω 330 Ω
Lower noise.
Increase of the
switch-on noise
Increase of SVR.
Increase of the
switch-on time.
Higher low
frequency cutoff.
Higher noise.
Danger of
oscillations.
Higher low
frequency cutoff.
Degradation of
SVR.
0.1 µF
0.1µF
2.2 µF 100 µF
Increase of the
distorsion at low
frequency
10 mF 100 µF
Danger of oscillation.
Higher low
frequency cutoff.
9/12
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