LA4805 데이터 시트보기 (PDF) - SANYO -> Panasonic

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LA4805

3 V Stereo Headphone Power Amplifier

SANYO -> Panasonic 

LA4805V

• C14 (0.22 to 0.47 µF)

Coupling capacitor that accepts the power output signal and inputs that signal to the PVSS function.

• C15 (220 µF)

Power supply line decoupling capacitor

• C16, C17, C18 (0.22 to 0.47 µF)

Oscillation suppression capacitors. We recommend using film capacitors.

• C19 (2.2 to 4.7 µF)

Smoothing capacitor for low boost on/off switching noise

• C20 (3.3 to 4.7 µF)

Determines the low boost attack time. Increasing the capacitance increases the attack time.

• C21, C23 (0.1 µF)

Low pass capacitors used with the low boost function

• C22 (2.2 to 4.7 µF)

Low boost amplifier NF capacitor. Values in excess of the recommended range will slow the low boost amplifier’s rise

time and may cause noise spikes.

• C24 (0.1 to 1.0 µF)

Determines the muting time. See the “IC Usage Notes” section for a discussion of the muting time when the capacitor

C24 value is varied.

• R1, R2 (10 kΩ)

Mixer amplifier load resistance and power input adjustment potentiometer.

• R3 (100 k to 1 MΩ)

Smoothing resistor for PVSS on/off switching noise

• R4 (50 k to 200 kΩ)

PVSS level adjustment resistor

• R5, R6, R7 (1 to 4.3 Ω)

Power amplifier oscillation suppression capacitors. We recommend using film capacitors.

• R8, R9 (15 kΩ)

Power output signal bias resistor for PVSS operation

• R10 (20 kΩ)

Determines the pin 25 bias when low boost is off.

• R11 (1.5 k to 2.2 kΩ)

Determines the low boost amplifier’s voltage gain.

• R12 (100 kΩ)

Determines the pin 30 bias when muting is off (and PWR is on).

We recommend using a 100 kΩ resistor for R12, since the muting switch pin (pin 30) threshold area is determined by

this (100 kΩ) resistance and the IC’s internal 300 kΩ resistance.

No. 4469-10/17

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