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LA4743 Datasheet(PDF) 6 Page - Sanyo Semicon Device |
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LA4743 Datasheet(HTML) 6 Page - Sanyo Semicon Device |
6 / 9 page No. 6630-6/9 LA4743B Notes on Usage and Handling • Oscillator stabilization time In some cases, details of the printed circuit board layout may lead to induced parasitic oscillation. This oscillation can be prevented by adding any one of the following components. Verify the optimal values for these capacitors by testing in actual end products. Technique 1 ... Connect Mylar capacitors (0.1 µF) between the BTL amplifier outputs. Technique 2 ... Connect an RC circuit (2.2 Ω and 0.1 µF in series) between each output and ground. • Audio quality (low band) The low-band frequency characteristics can be improved by adjusting the values of the input capacitors. The recommended value is 2.2 µF. • Impulse noise The LA4743B includes a built-in impulse noise suppression circuit. However, further improvement can be achieved by using the muting circuit. When first applying power, activate the muting function at the same time as applying power. Then, after the output DC potential has stabilized, turn off the muting function. When turning off the power, first activate the muting function and then turn off the power. Sample transient responses are attached (see the timing charts). Transient Responses at Power On Power on: Standby and muting activated at the same time. Muting is turned off after the output has stabilized. + 22 3.3 µF Mute 10 k Ω MUTE MUTE OFF ON TIME 5 [V] 0 4 2 0 200 ms/div 0 [V] 5 [V] Transient Responses at Power Off Power off: After activating the muting circuit, turn the power off. + 22 3.3 µF Mute 10 k Ω MUTE 200 ms/div 5 [V] 0 4 2 0 0 [V] 5 [V] Standby set high External 10 k Ω muting switch Standby pin Output pin Standby set low External 10 k Ω muting switch Standby pin Output pin |
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