LA4629

No.6502-3/6

Block Diagram

Pin Functions

1. Standby switch function (pin 6)

• If a microcontroller output signal is applied directly, insert a resistor in series

and adjust the current to a level optimal for the drive capability of the

microcontroller.

2. Input pins (pins 9 and 10)

The input pin voltage is about 2 VBE (1.4 V).

The input pin impedance is about 30 k

Ω.

• Although the recommended value for the input capacitor is 0.22

µF, the starting time can be modified by changing the

value of this capacitor. (The time from the point a voltage is applied to the standby pin to the point sound is emitted.)

Input capacitor

1.0

µF

2.2

µF

3.3

µF

4.7

µF

10

µF

Starting time (ts)

0.2 s

0.3 s

0.5 s

0.65 s

1.5 s

ILA00075

2 k

Ω

Rx

+

STBY

6

STBY pin applied voltage: 5 V

To hold the pin 6 inflow current to about 750

µA insert a resistor (Rx) of 4.7 kΩ

STBY pin applied voltage: 12 V

To hold the pin 6 inflow current to about 750

µA insert a resistor (Rx) of 14 kΩ (12 kΩ).

STBY pin applied voltage: Other value (Vx)

To hold the pin 6 inflow current to about 750

µA insert a resistor (Rx) of (Vx - 1.5 V)/750 µA.

Applied standby

voltage Vx

The inflowing current at an

applied voltage of 1.5 V, i.e.

the point when the amplifier

turns on, is approximately

750

µA.

ch1

Input

ch2

Input

PRE GND

ch1

Output

ch2

Output

POWER GND

STBY

P.P

Filter

VCC

ILA00076

9

6

12

10

8

7

3

5

2

1

ch2 input

amplifier

Standby SW

TSD protector

Pop noise prevention block

Ripple filter

ch1 input

amplifier

Output

amplifier

Output

amplifier

REF

amplifier

RNf1

Rf1

Rf2

RNf2