LA4800V Ver la hoja de datos (PDF) - SANYO -> Panasonic

Número de pieza

componentes Descripción

Fabricante

LA4800V

3 V Stereo Headphone Power Amplifier

SANYO -> Panasonic 

LA4800V

External Components Description

Components

C1, C2

C3, C4

C5, C4

C6

C8

C9, C10, C11

C12

R1, R2

R3, R4, R5

R6

Recommended value

1 to 4.7 µF

3.3 to 10 µF

4.7 to 10 µF

0.1 to 1 µF

220 µF

0.22 to 0.47 µF

0.1 to 1.0µF

0.5 to 4.3 Ω

100 kΩ

Description

Input coupling capacitors

Reference bias (VREF) decoupling capacitors

Ripple filter capacitors. Increasing the capacitance also increases the distortion and

the supply rise time at turn ON.

Input coupling capacitor for the beep tone. Choose a value that does not attenuate the

beep tone signal.

Supply line coupling capacitor

Oscillation damping capacitors. Film capacitors are recommended.

Mute time setting capacitor. See the description in the Operating Notes.

Beep tone input signal adjustment resistors. Follow the manufactures instructions.

Power amplifier oscillation damping resistors.

Mute OFF pin 16 bias setting resistor. The internal 300 kΩ resistor and this 100 kΩ

resistor together set the mute switch (pin 16) threshold.

Operating Notes

Beep tone operating principle

Signal from microcontroller

Unit (resistance: Ω, capacitance: F)

The design of the above when mute is ON (pin 16 open) is as follows:

The output voltage VO as function of RL is

VO =

RL

× VA

RL+ 3k+ 1k

For example, if RL = 16 Ω and VA = 0.5 V (VA is the adjusted input voltage on pin 9),

16Ω

VO =

× 0.5 ≅ 2 mV

16Ω + 3k+ 1k

The beep tone output voltage VO is determined by the above equation. However, the oscillation damping RC components are

connected to the PWR output and hence these RC components will also influence the actual value of VO. When using the beep

tone, the impedance of C10, connected to the common output (pin 13), must be greater than the impedance of C9 and C11, i.e.

C10 must be greater than C9 and C11.

No.4335-6/11

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