LA42101 Просмотр технического описания (PDF) - SANYO -> Panasonic

Номер в каталоге

Компоненты Описание

производитель

LA42101

Monolithic Linear IC Audio Output for TV application 10W × 1ch Power Amplifier

SANYO -> Panasonic 

External Components

LA42101

C1

C2

C3, R1

C4

C5, C6

R2, R3

: The input coupling capacitors, for which 4.7μF or less is recommended. LA42101 employs the zero-bias type

input circuit, with the input pin potential being nearly zero (about 0.01V). Accordingly, the polarity must be

determined according to the DC potential of a circuit connected to the previous stage of LA42101.

: Capacitor for starting time of the ripple filter and amplifier, for which 47μF is recommended.

: Capacitor and resistor for mute. C3 is necessary even when the mute function is not used.

: Power capacitor.

: Capacitor and resistor for oscillation prevention. For C5, C6, the polyester film capacitor with superior

temperature characteristics (Mylar capacitor) is recommended. Use R2, R3 of 2.2Ω along with the capacitor.

1. Mute function (pin 6)

With the pin 6 voltage of 1.5V (minimum) or more, the mute function is turned ON.

Set the VM application voltage so that the pin 6 voltage becomes. 1.5V or more.

The mute time constant is determined by R1 and C3. Determine the constant after careful review because it is related

to the pop sound at mute ON/OFF.

C4 is necessary even when the mute function is not used because it is related to the pop sound when the amplifier is

turned ON.

Example : The pin 6 voltage becomes about 1.8V when VM = 5V and R1 = 15kΩ.

Note that the MUTE pin (pin 6) incorporates the anti-static

Mute

diodo and that decrease of the VCC pin 7 potential below that of

pin 6 causes the current to flow through the diode.

VCC

R1

VM

6

C3 +

10μF

2kΩ

20kΩ

2kΩ

2. Standby function (pin 5)

The amplifier is turned ON when the voltage of 2.5V (minimum) or more is applied to pin 5.

Pin 5 control voltage

Pin 5 voltage

0 to 0.5

2.5 to VCC

Amplifier

OFF

ON

Standby

ON

OFF

Standby

To suppress the inrush current to pin 5 when the VSTB

application voltage is high, insert the control resistor (RSTB).

VS

RSTB

5

Example : Tosuppress the pin 5 inrush current to 500μA or less

VCC

15kΩ

30kΩ

2VBE

1.5kΩ

RSTB

=

Applied

voltage

(VSTB) -2VBE

500μA

(About

1.4V)

-15kΩ

Note that the standby pin (pin 5) incorporates the anti-electrostatic diode, allowing the cu orrent to flow through the

diode when the potential of VCC pin 7 decreases below that of pin 5.

No.A0740-4/7

Share Link: