LA4581 查看數據表（PDF） - SANYO -> Panasonic

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LA4581

Preamplifier + Power Amplifier for 3V Headphone Stereos

SANYO -> Panasonic 

LA4581MB

IC Usage Notes

1. The power amplifier outputs and the common amplifier output are connected through resistors of about 60 Ω. The resistors

are for common amplifier oscillation blocking.

Ω

Ω

2. The preamplifier muting function isolates the preamplifier outputs from SW OUT. The preamplifier is on even when the

preamplifier muting is on.

3. If transient noise is noticeable when the power supply is turned off, add the external circuit described below. Transient noise

when the power is turned off can be improved by rapidly applying the power amplifier muting.

Unit (resistance: Ω, capacitance: F)

4. Internal equivalent circuit for each SW pin.

. Pre-mute

However, the standby current IST flows even when the

power switch is off

IST = (VCC − VBE)/600 kΩ

When VCC = 3.0 V

IST = (3.0 − 0.6)/600 kΩ 7 4 µA

.Power mute

Unit (resistance: Ω)

MUTE ON condition : V8IN ^ VCC – 0.2 V

Inflow current : I8 7 60 µA (when VCC = 3.0 V)

.F/R SW

Unit (resistance: Ω, capacitance: F)

MUTE ON condition : V16 % 0.3 V

Outflow current : I16 7 2.5 µA

REV condition : V17 % 0.2 V

Unit (resistance: Ω, capacitance: F)

No.3535-5/8

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