STK433-760-E

No. A1476-11/12

STK433-760-E Stand-by Control & Mute Control Application

[The example of use STK433-*00series Stand-by control circuit]

Features

• By using the recommended stand-by control application, the pop noise level when the power is turned on/off can be

significantly reduced.

• By adjusting the limiting resistance (*2) in accordance with the voltages of the microcontroller and other components

used, it is possible to perform stand-by control, facilitating the finished product design effort.

(ex) STK433-*00series test circuit. When impressed by Stand-by control control [+5V].

Operation Explanation

1) About VST (

#13pin Stand-by Threshold)

<1> Operation Mode

When pin 13 reference voltage VST is equal to or greater than 2.5V, the stand-by circuit is set off, and the

amplifier is set to the operation mode.

<2> Stand-by Mode

When pin 13 reference voltage VST is equal to or less than 0.6V, the stand-by circuit is set off, and the amplifier is

set to the stand-by mode.

(*3) The pop noise that occurs when the power is turned ON is reduced by providing a time constant using a capacitor

during operation.

(*4) The pop noise level is reduced by discharging the capacitor with a resistor in the stand-by mode.

2

3

4

5

6

7

8

9

10

11

12

13

14

1

15

STK433-*00series

+VCC

Ch1

IN

Ch1

NF

Ch2

IN

Ch2

NF

Ch2

OUT

Ch1

OUT

-VCC

MONITOR

+PRE

ST-BY

Ch1

OUT

Ch2

OUT

-PRE

33k

Ω

2k

Ω

(*4)

1k

Ω (*1)

33

μF (min)

(*3)

Stand-by control circuit part

H: Operation mode (+5V)

L: Stand-by mode (0V)

ΔVBE

SUB/

GND

ΔVBE

ex) VST=(Stand-by Control-VBE*2)

× (*2)/((*1)+(*2))+VBE

=(5V-0.6V*2)

×4.3kΩ/(4.3kΩ+1kΩ)+0.6V

≈3.68(V)

Stand-by Circuit

in Pre Driver IC

4.3k

Ω (*2)

VST

ST-BY

PLAY

MUTE

ST-BY

MUTE

+5V

+5V

Stand-by

Control

Mute

Control

Ch1 OUT

GND

+VCC

-VCC

STK433-760-E

GND

Ch2 IN

GND

Ch1 IN

(10k

Ω)

10k

Ω

10k

Ω

10k

Ω

2.2k

Ω

VST

GND

Ch2 OUT

Mute Control

H: Single Mute

L: Normal

Stand-by Control(ex)

H: Operation Mode(+5V)

L: Stand-by Mode(0V)

2

3

4

5

6

7

8

9

10

11

12

13

14

1

15

+VCC

Ch1

IN

Ch1

NF

Ch2

IN

Ch2

NF

Ch2

OUT

Ch1

OUT

-VCC

SUB/

GND MONITOR

+PRE

ST-BY

Ch1

OUT

Ch2

OUT

-PRE

MONITOR

(0.1

μF)

R03

R31

TR1

C32

R33