|Beschreibung||18W Hi-Fi AMPLIFIER AND 35W DRIVER|
Gesamt 14 Seiten
18W Hi-Fi AMPLIFIER AND
The TDA2030 is a monolithic IC in Pentawatt package
intended for use as low frequency class AB amplifier.
With Vsmax=44V it is particularly suited for more reliable
applications withou regulated supply and for 35W driver
circuits using lowcost complementary pairs.
The TDA2030 provides high output current and has very
low harmonic and cross-over distortion.
Further the device incorporates a short circuit protection
system somprising an arrangement for automatically limiting
the dissipated power to as to keep the working point of the
output transistors within their safe operating area. A
conventional thermal system is also included.
ABSOLUTE MAXIMUM RATINGS(Ta=25°C)
Differential input voltage
Peak output current(internally limited)
Total power dissipation at Tcase=90°
Fig. 8 Single supply high power amplifier(TDA2032+BD908/BD907)
TYPICAL PERFORMANCE OF THE CIRCUIT OF FIG. 8
PARAMETER SYMBOL TEST CONDITIONS
f=40Hz to 15kHz,Vs=39V
Po f=40Hz to 15kHz,Vs=36V
Po=20W,f=40Hz to 15kHz
Signal to Noise
S/N B=curve A,Po=25W
The result is an AC signal at the output whole peak-to-peak value is the TIM voltage,which can be measured
easily with an oscilloscope.If the peak-topeak value of the signal and the peak-to-peak of the inverting sawtooth are
measured,the TIM can be found very simply from:
Fig. 25 TIM distortion Vs.
10-1 RC Filter fc=30kHz
Fig. 26 TIM design
RC Filter fc=30kHz
10-1 100 101 Po(W) 102
10-1 100 101 102
In Fig.25 The experimental results are shown for the 30W amplifier using the TDA2030A as a driver and a low-cost
complementary pair.A simple RC filter on the input of the amplifier to limit the maxmium signal slope(SS) is an
effective way to reduce TIM.
The Digram of Fig.26 originated by SGS can be used to find the Slew-Rate(SR) required for a given output power
or voltage and a TIM design target.
For example if an anti-TIM filter with a cutoff at 30kHz is used and the max.Peak to peak output voltage is 20V then,
referring to the diagram, a Slew-Rate of 6V/µs is necessary for 0.1% TIM.
As shown Slew-Rates of above 10V/µs do not contribute to a further reduction in TIM.
Slew-Rates of 100V/µs are not only useless but also a disadvantage in Hi-Fi audio amplifiers because they tend to
turn the amplifier into a radio receiver.
Using monolithic audio amplifier with non regulated supply correctly.In any working case it must provide a supply
voltage less than the maximum value fixed by the IC breakdown voltage.
It is essential to take into account all the working conditions, in particular mains fluctuations and supply voltage
variations with and without load.The TDA2030A(Vsmax=44V) is particularly suitable for substitution of the standard
IC power amplifiers(with Vsmax=36V) for more reliable applications.
An example, using a simple full-wave rectifier followed by a capacitor filter, is shown in the table and in the
diagram of Fig.27.
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 signal peaks.They are not 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 conditions),the
additional cost and power dissipation do not usually justify its use.using non-regulated supplies,there are fewer
designe restriction.In fact,when signal peaks are present, the capacitor filter acts as a flywheel supplying the
|Seiten||Gesamt 14 Seiten|
|PDF Download||[ TDA2030 Schematic.PDF ]|
|TDA2030||14W HI-FI AUDIO AMPLIFIER|
|TDA2030||14W Hi-Fi AUDIO AMPLIFIER|
|TDA2030||18W Hi-Fi AMPLIFIER AND 35W DRIVER|
|TDA2030A||18W Hi-Fi AMPLIFIER AND 35W DRIVER|
|TDA2030A||14W HI-FI AUDIO AMPLIFIER|
Hex D-Type Flip-Flop / Quad D-Type Flip-Flop.
EPITAXIAL PLANAR NPN TRANSISTOR.
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