UTC2030 Просмотр технического описания (PDF) - Unspecified
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UTC2030 Datasheet PDF : 14 Pages
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UTC2030
LINEAR INTEGRATED CIRCUIT
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:
VOUT
TIM =
* 100
Vsawtooth
101
TIM(%)
100
Fig. 25 TIM distortion Vs.
Output Power
UTC2030
BD908/907
Gv=26dB
Ω Vs=32V
RL=4
10-1
RC Filter fc=30kHz
102
祍 SR(V/ )
Fig. 26 TIM design
diagram(fc=30kHz)
RC Filter fc=30kHz
101
100
TIM=0.0T1I%M=0.T1I%M=1%
10-2
10-1
100
101 Po(W) 102
10-1
10-1
100
101
102
Vo(Vp-p)
In Fig.25 The experimental results are shown for the 30W amplifier using the UTC2030 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 16V 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.
Power Supply
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 UTC2030(Vsmax=32V) is particularly suitable for substitution of the standard
IC power amplifiers(with Vsmax=28V) 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
required energy.
YOUWANG ELECTRONICS CO.LTD
12
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