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TDA2030AH Datasheet(PDF) 13 Page - STMicroelectronics

Part No. TDA2030AH
Description  18W Hi-Fi AMPLIFIER AND 35W DRIVER
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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 13 page
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Table 2
Comp.
Recom.
Value
Purpose
Larger than
Recommended Value
Smaller than
Recommended Value
R1
22k
Closed loop gain setting
Increase of gain
Decrease of gain
R2
680
Closed loop gain setting
Decrease of gain (*)
Increase of gain
R3
22k
Non inverting input biasing
Increase of input impedance
Decrease of input impedance
R4
1
Frequency Stability
Danger of oscillation at high
frequencies with inductive
loads
R5
≅ 3R2
Upper Frequency Cut-off
Poor High Frequencies
Attenuation
Danger of Oscillation
C1
1
µF
Input DC Decoupling
Increase of low frequencies
cut-off
C2
22
µF
Inverting DC Decoupling
Increase of low frequencies
cut-off
C3, C4
0.1
µF
Supply Voltage Bypass
Danger of Oscillation
C5, C6
100
µF
Supply Voltage Bypass
Danger of Oscillation
C7
0.22
µF
Frequency Stability
Larger Bandwidth
C8
1
2
πBR1
Upper Frequency Cut-off
Smaller Bandwidth
Larger Bandwidth
D1, D2
1N4001
To protect the device against output voltage spikes
Table 1
Mains
(220V)
Secondary
Voltage
DC Outpu t Voltage (Vo)
Io =0
Io = 0.1A
Io =1A
+ 20%
28.8V
43.2V
42V
37.5V
+ 15%
27.6V
41.4V
40.3V
35.8V
+ 10%
26.4V
39.6V
38.5V
34.2V
24V
36.2V
35V
31V
– 10%
21.6V
32.4V
31.5V
27.8V
– 15%
20.4V
30.6V
29.8V
26V
– 20%
19.2V
28.8V
28V
24.3V
A regulated supply is not usually used for the power
output stages because of its dimensioning must be
done taking into account the power to supply in the
signal peaks. They are only a small percentage of
the total music signal, with consequently large
overdimensioning of the circuit.
Even if with a regulated supply higher output power
can be obtained (VS is constant in all working condi-
tions), the additional cost and power dissipation do
not usually justify its use. Using non-regulated sup-
plies, there are fewer designe restriction. In fact,
when signal peaks are present, the capacitor filter
acts as a flywheel supplying the required energy.
In average conditions, the continuous power sup-
plied is lower. The music power/continuous power
ratio is greater in this case than for the case of
regulated supplied, with space saving and cost
reduction.
(*) The value of closed loop gain must be higher than 24dB.
APPLICATION SUGGESTION
The recommended values of the components are
those shown on application circuit of Figure 14.
Different values can be used. The Table 2 can help
the designer.
SHORT CIRCUIT PROTECTION
The TDA2030A has an original circuit which limits
the current of the output transistors. This function
can be considered as being peak power limiting
rather than simple current limiting. It reduces the
possibility that the device gets damaged during an
accidental short circuit from AC output to ground.
THERMAL SHUT-DOWN
The presence of a thermal limiting circuit offers the
following advantages:
1.
An overload on the output (even if it is
permanent), or an above limit ambient
temperature can be easily supported since the
Tj cannot be higher than 150
oC.
2.
The heatsink can have a smaller factor of
safety compared with that of a conventional
circuit. There is no possibility of device damage
due to high junction temperature. If for any
reason, the junction temperature increases up
to 150
oC, the thermal shut-down simply
reduces the power dissipation and the current
consumption.
TDA2030A
13/15




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