ILA7056B Просмотр технического описания (PDF) - IK Semicon Co., Ltd
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ILA7056B Datasheet PDF : 7 Pages
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ILA7056B
FUNCTIONAL DESCRIPTION
The ILA7056B is a mono BTL output amplifier with DC volume control, designed for use in TV and monitor but is
also suitable for battery-fed portable recorders and radios.
In conventional DC volume circuits the control or input stage is AC coupled to the output stage via external capacitors
to keep the offset voltage low. In the ILA7056B the DC volume control stage is integrated into the input stage so that no
coupling capacitors are required. With this configuration, a low offset voltage is still maintained and the minimum
supply voltage remains low.
The BTL principle offers the following advantages:
Lower peak value of the supply current
The frequency of the ripple on the supply voltage is twice the signal frequency.
Consequently, a reduced power supply with smaller capacitors can be used which results in cost reductions. For
portable applications there is a trend to decrease the supply voltage, resulting in a reduction of output power at
conventional output stages. Using the BTL principle increases the output power.
The maximum gain of the amplifier is fixed at 40.5 dB. The DC volume control stage has a logarithmic control
characteristic. Therefore, the total gain can be controlled from 40.5 dB to -33 dB. If the DC volume control voltage
falls below 0.4 V, the device will switch to the mute mode.
The amplifier is short-circuit proof to ground, VP and
across the load. Also a thermal protection circuit is implemented. If the crystal temperature rises above +150oC the gain
will be reduced, thereby reducing the output power. Special attention is given to switch-on and switch-off clicks, low
HF radiation and a good overall stability.
Power dissipation
Assume VP = 12 V; RL = 16 .
The maximum sine wave dissipation is = 1.8 W.
The Rth vj-a of the package is 55 K/W.
Therefore Tamb (max)
-
oC.
Figure 3. Gain control as a function of DC volume control.
Figure 4. Noise output voltage as a function of DC volume
control.
Rev. 00
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