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LA4905 Datasheet(Fiches technique) 3 Page - Sanyo Semicon Device

Numéro de pièce LA4905
Description  17-W, 2-Channel BTL AF High-Efficiency Power Amplifier for Car Stereo Systems
Télécharger  10 Pages
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Fabricant  SANYO [Sanyo Semicon Device]
Site Internet  http://www.ssdc-jp.com/eng/
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LA4905 High-Efficiency Technology
(1) Signal-following switching scheme
The LA4905 adopts a switching regulator scheme in
the power supply applied to the amplifier output stage.
The LA4905 power dissipation is reduced significantly
by having the output voltage of the switching regulator
follow the input signal. Furthermore, in combination
with the nonlinear amplifier scheme described below,
the LA4905 design reduces the number of switching
regulators to merely one circuit even though it is a
BTL 2-channel amplifier. (See Figure 1.)
(2) Nonlinear amplifier
The LA4905 adopts a nonlinear amplifier that has the
nonlinear characteristics shown in Figure 2 in the
amplifier signal system. This scheme does not use the
center point voltage of 1/2 VCC used in normal
amplifiers, but instead uses a voltage about 2 V lower.
This allows the design to dispense with the lower side
switching regulator.
This nonlinear amplifier has a structure based on a
differential amplifier that has symmetric negative
feedback circuits. Although the BTL output stage
positive and negative phase output waveform is a half-
wave waveform that is expanded and compressed as
shown in Figure 3, the combined output waveform at
the negative load terminal is identical to that output by
earlier products.
No. 5504-3/10
LA4905




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