LA4631VC 데이터 시트보기 (PDF) - ON Semiconductor
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LA4631VC Datasheet PDF : 7 Pages
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LA4631VC
External Components and Usage Notes
C1, C2 : These are input coupling capacitors; we recommend a value of 1μF or lower. The LA4631VC input pin
potential is about 1.4V, and the polarity must be considered due to the DC potential of the circuits connected
to the LA4631VC front end. The amplifier's startup time (the time from the point power is first applied until
the point an output is generated) will change proportionally with the values of these input capacitors. (When
1μF capacitors are used, the startup time will be about 0.2 seconds.)
C3
: This capacitor is used as a ripple filter. We recommend a value of 100μF. Amplifier impulse noise when
turned off (when the standby pin goes low) may be made worse if a value under 100μF is used. The pin 1
voltage is about 1/2VCC. A DC mute function can be applied if pin 1 is connected to ground through a 300 to
500Ω resistor. Note that the muting activation voltage will be too low if a resistor value of 750Ω or higher is
used.
C4
: This is an impulse noise prevention capacitor. The recommended value is 4.7μF. If a value of 2.2μF or lower
is used for C4, impulse noise when the amplifier is turned off (when the standby pin goes low) may be made
worse. Also, if a value of 10μF or higher is used, an "incomplete muting" phenomenon may occur when the
amplifier is turned off (when the standby pin goes low).
C5
: Power supply capacitor. This capacitor should be located as close as possible to the IC (to minimize
increases in the power supply line impedance) to achieve stable amplifier operation.
C6, C7 : Output capacitors. These capacitors influence the amplifiers low band frequency characteristics. (fc =
1/2πCout×RL)
fc = low band cutoff frequency, Cout = C6, C7
(Reference) Pin 5 Equivalent Circuit Inside IC
(Reference) Pin 5 IC internal equivalent circuit
+
Standby
applied
voltage Vx
Rx Ix
R2
STBY 2k
5
Ix=max 4.5mA
• The amplifier can be turned on and off by controlling the level (high/low) of Pin 5.
• Applying a signal equal or greater than 1.5V and 800μA to Pin 5 turns on the amplifier. (If 5V is applied directly to
Pin 5 the inflow current od Pin 5 is approximately 4.5mA.)
• If a voltage, Vx, exceeding 5V is to be applied, current limiting resistor (Rx) should be inserted to limit the inflow
current to 4.5mA. (See following equation.)
Rx = (Vx – 5V)/4.5mA
• If Pin 5 is to be controlled by the microprocessor, the Pin 5 inflow current (Ix) should be optimized for the capacity
of the microprocessor by calculating Rx using the following equation, as a general guideline, and then confirming
the inflow current through sctual measurement.
Rx = (Vx/Ix) – R1 (2kΩ)
Note: When apply voltage to standby (Pin 5), please add resistor (Rx).
No.A2051-4/7
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