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TDA2030A View Datasheet(PDF) - STMicroelectronics

Part NameTDA2030A ST-Microelectronics
STMicroelectronics ST-Microelectronics
Description18W Hi-Fi AMPLIFIER AND 35W DRIVER
TDA2030A Datasheet PDF : 16 Pages
First Prev 11 12 13 14 15 16
TDA2030A
Table 1
Mains Secondary
(220V) Voltage
+ 20%
+ 15%
+ 10%
– 10%
– 15%
– 20%
28.8V
27.6V
26.4V
24V
21.6V
20.4V
19.2V
DC Output Voltage (Vo)
Io = 0 Io = 0.1A Io = 1A
43.2V
42V
37.5V
41.4V 40.3V 35.8V
39.6V 38.5V 34.2V
36.2V
35V
31V
32.4V 31.5V 27.8V
30.6V 29.8V
26V
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.
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 150oC.
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 150oC,
the thermal shut-down simply reduces the
power dissipation and the current
consumption.
Table 2
Comp.
R1
R2
R3
R4
Recom.
Value
22k
680
22k
1
Purpose
Closed loop gain setting
Closed loop gain setting
Non inverting input biasing
Frequency Stability
R5
3 R2 Upper Frequency Cut-off
C1
1µF
Input DC Decoupling
Larger than
Recommended Value
Increase of gain
Decrease of gain (*)
Increase of input impedance
Danger of oscillation at high
frequencies with inductive
loads
Poor High Frequencies
Attenuation
C2
22µF Inverting DC Decoupling
C3, C4
C5, C6
C7
C8
0.1µF
100µF
0.22µF
1
2πBR1
Supply Voltage Bypass
Supply Voltage Bypass
Frequency Stability
UpperFrequencyCut-off
SmalleBr andwidth
D1, D2 1N4001 Toprotectthedeviceagainstoutputvoltagespikes
(*) The value of closed loop gain must be higher than 24dB.
Smaller than
Recommended Value
Decrease of gain
Increase of gain
Decrease of input impedance
Danger of Oscillation
Increase of low frequencies
cut-off
Increase of low frequencies
cut-off
Danger of Oscillation
Danger of Oscillation
Larger Bandwidth
LargeBr andwidth
13/15
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DESCRIPTION
The TDA2030A is a monolithic IC in Pentawatt ® package intended for use as low frequency class AB amplifier.
With VS max = 44V it is particularly suited for more reliable applications without regulated supply and for 35W driver circuits using low-cost complementary pairs. The TDA2030A provides high output current and has very low harmonic and cross-over distortion. Further the device incorporates a short circuit protection system comprising an arrangement for automatically limiting the dissipated power so as to keep the working point of the output transistors within their safe operating area. A conventional thermal shut-down system is also included.

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