STK433-890N-E

No.A2109-11/12

STK433-800 series Stand-by Control & Mute Control & Load-Short Protection

Application

[STK433-800N-E series Stand-By Control Example]

[Feature]

 The pop noise which occurs to the time of power supply on/off can be improved substantially by recommendation

Stand-By Control Application.

 Stand-By Control can be done by additionally adjusting the limitation resistance to the voltage such as micom, the set

design is easy.

(Reference circuit) STK433-800N-E series test circuit To Stand-By Control added +5V.

[Operation explanation] #13pin Stand-By Control Voltage VST

(1) Operation Mode

The switching transistor in the bias circuit turns on and places the amplifier into the operating mode, when 13pin

(VST) voltage added above 2.5V (typ 3.0V).

(2) Stand-By Mode

When 13pin (VST) voltage is stopped (= 0V), the switching transistor in the bias circuit turn off, placing the

amplifier into the standby mode.

(*1) The current limiting resistor must be used to ensure that stand-by pin (13pin) voltage does not exceed its

maximum rated value VST max.

(*2) The pop noise level when the power is turned on can be reduced by setting the time constant with a capacitor

in operating mode.

(*3) Determines the time constant at which the capacitor (*2) is discharged in stand-by mode.

(*1) Please use restriction resistance as there is no Stand-by

terminal voltage (#13pin) beyond maximun rating (VSTmax).

Stand-by Control(ex)

H:Operation Mode(+5V)

L:Stand-by Mode(0V)

33μF

/10V

33kΩ

1kΩ

2kΩ

1.3kΩ

(*1)

STK433-800N-E series

+Vcc

Ch1

IN

Ch1

NF

Ch2

IN

Ch2

NF

Ch2

OUT

Ch1

OUT

-Vcc

SUB

GND

+PRE

ST-BY

Ch1

OUT

Ch2

OUT

2

3

4

5

8

7

6

9

10 11 12 13 14 15

1

-PRE

Ch3

IN

Ch3

NF

16 17 18 19

Mute Control

H:Single Mute

L:Normal

GND

Ch1 IN

GND

+Vcc

-Vcc

Ch2 OUT

Ch1 OUT

GND

GND

Ch3 OUT

20 21 22 23

Ch3

OUT

Ch4

IN

Ch4

NF

Ch3

OUT

Ch4

OUT

Ch4

OUT

Ch4 OUT

10kΩ

10kΩ

10kΩ

2.2kΩ

10kΩ

10kΩ

Ch4 IN

GND

GND

Ch2 IN

Ch3 IN

56kΩ 6.8kΩ

Latch Up

Circuit

10kΩ

56kΩ

1kΩ

22kΩ

0.1μF

R1

(*4)

V1

56kΩ

6.8kΩ

56kΩ

6.8kΩ

56kΩ 6.8kΩ

Load Short Protection

Circuit

(*4) R1 is changed depending on the power-supply voltage(-Vcc).

Please set resistance(R1) to become [V1=0v] by the following calculation types.

+5V

+5V

Stand-by

Control

Mute

Control

ST-BY

PLAY

ST-BY

MUTE

MUTE

Stand-by Control

H:Operation Mode(+5V)

L:Stand-by Mode(0V)

1.3KΩ(*1)

IST

∆VBE

1

2

3

4

7

6

5

8

9

10 11 12

STK433-800N-E series

13 14

+Vcc

Ch1

IN

Ch1

NF

Ch2

IN

Ch2

NF

Ch2

OUT

Ch1

OUT

-Vcc

SUB GND

+PRE

ST-BY

Ch1

OUT

Ch2

OUT

Bias Circuit

in PreDriver IC

∆VBE

-PRE

Ch3

NF

Ch4

NF

Ch4

IN

Ch3

IN

#13pin Stand-By OFF threshold.

VST

33μF

(*2)

33kΩ

1kΩ

(*3)

2kΩ

(*3)

2.2kΩ(*2)

15 16 17 18 19 20 21 22 23

Ch3

OUT

Ch3

OUT

Ch4

OUT

Ch4

OUT

ex)Stand-By Control Voltage VST=+5v

VST is set by the limitation resistance(*1).

· IST =(VST-VBE*2)/((*1)+(*2))

=(5v-0.6v*2)/(2.2kΩ+1.3kΩ)

=1.09(mA)

· VST=IST×2.2kΩ+VBE=1.09×2.2k+0.6=3.0(V)

Switching transistor

in the bias circuit