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LA4905 Scheda tecnica(PDF) 3 Page - Sanyo Semicon Device |
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LA4905 Scheda tecnica(HTML) 3 Page - Sanyo Semicon Device |
3 / 10 page 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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