TDA2004R 데이터 시트보기 (PDF) - STMicroelectronics
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TDA2004R Datasheet PDF : 17 Pages
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Application suggestion
3
Application suggestion
TDA2004R
The recommended values of the components are those shown on application circuit of
Figure 2. Different values can be used; the following table can help the designer.
Table 5. Recommended values of the component of the application circuit
Component
Recommended
value
Purpose
Larger than
Smaller than r
R1
R2, R4
R3, R5
120 k
1 k
3.3
Optimization of the
output signal symmetry
Smaller Pomax
Closed loop gain setting Increase of gain
(1)
Decrease of gain
Smaller Pomax
Decrease of gain
Increase of gain
R6, R7
C1, C2
1
2.2 F
Frequency stability
Input DC decoupling
Danger of oscillation
at high frequency with
inductive load
High turn-on delay
High turn-on pop, higher
low frequency cutoff.
Increase of noise
C3
C4, C6
10 F
100 F
Ripple rejection
Bootstrapping
Increase of SVR,
Increase of the switch-on Degradation of SVR
time
-
Increase of distortion at
low frequency
C5, C7
C8, C9
C10, C11
Feedback input DC
100 F
-
decoupling
0.1 F
Frequency stability
-
1000 to 2200 F Output DC decoupling -
-
Danger of oscillation
Higher low-frequency
cut-off
1. The closed loop gain must be higher than 26 dB.
3.1
3.1.1
Built-in protection systems
Load dump voltage surge
The TDA2004R has a circuit which enables it to withstand voltage pulse train, on Pin 9, of
the type shown in Figure 20. If the supply voltage peaks to more than 40 V, then an LC filter
must be inserted between the supply and pin 9, in order to assure that the pulses at pin 9
will be held within the limits shown.
A suggested LC network is shown in Figure 19. With this network, a train of pulses with
amplitude up to 120 V and width of 2 ms can be applied at point A. This type of protection is
ON when the supply voltage (pulse or DC) exceeds 18 V. For this reason the maximum
operating supply voltage is 18 V.
12/17
Doc ID 17614 Rev 2
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