LA4805 데이터 시트보기 (PDF) - SANYO -> Panasonic
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LA4805 Datasheet PDF : 17 Pages
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Usage Notes and Operating Principles
1. Beep function operating principles
LA4805V
• The figure above shows the beep function block, which is designed to operate when muting is on, i.e., when pin 16
is open.
The output voltage generated at RL at that time is given by the following equation.
VO
=
RL
+
RL
3k
+
1
k
× VA
For example, when RL is 16 Ω and VA is 0.5 V: (VA is adjusted by the pin 9 input level.)
16 Ω
VO = 16 Ω + 3 k + 1 k × 0.5 V ≈ 2 mV
• While the beep output VO is determined by the formula above, it is influenced by the capacitor and resistor used to
form the PWR output oscillation suppression function. Therefore, when using the beep function, it is necessary to
make the impedance due to the pin 13 capacitor C10 smaller than the impedance of capacitors C9 and C10 on pins
12 and 15, since pin 13 is a common output. Which is to say, the capacitor C10 must be larger than the capacitors
C9 and C10.
2. Muting time
• The figure above shows the waveform when the muting function is turned on and off. The ts on and off times here
can be changed by the capacitor Cr on pin 16. While the recommended value for Cr is 1 µF, note that reducing this
value can lead to increased impulse (“pop”) noise.
No. 4469-11/17
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