STK433-330N-E

No.A2107-10/11

STK433-300 series Stand-by Control & Mute Control & Load-Short Protection

Application

[STK433-300N-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) STK433-300N-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).

STK433-300N-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

56kΩ

2

3

4

5

8

7

6

9

10 11 12 13 14 15

1

-PRE

GND

+Vcc

-Vcc

56kΩ

6.8kΩ

6.8kΩ

GND

Ch1 IN

10kΩ

10kΩ

10kΩ

2.2kΩ

Mute Control

H:Single Mute

L:Normal

Stand-by Control(ex)

H:Operation Mode(+5V)

L:Stand-by Mode(0V)

33μF

/10V

33kΩ

1kΩ

2kΩ

2.7kΩ

(*1)

Ch2 OUT

Ch1 OUT

Load Short Protection

Circuit

Ch3

IN

Ch3

NF

16 17 18 19

Ch3

OUT

Ch3

OUT

Ch3 OUT

6.8kΩ

56kΩ

10kΩ

GND

GND

GND

Ch2 IN

Ch3 IN

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

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

Latch Up

Circuit

10kΩ

56kΩ

1kΩ

22kΩ

0.1μF

R1

(*4)

V1

+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)

2.7KΩ(*1)

IST

∆VBE

1

2

3

4

7

6

5

8

9

10 11

12

STK433-300Nseries

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

15

-PRE

#13pin Stand-By OFF threshold.

16 17 18

Ch3

IN

Ch3

OUT

Ch3

OUT

19

Ch3

NF

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)/(4.7kΩ+2.7kΩ)

=0.513(mA)

· VST=IST×4.7kΩ+VBE=0.513×4.7k+0.6=3.0(V)

4.7kΩ(*2)

VST

33μF

(*2)

33kΩ

1kΩ

(*3)

2kΩ

(*3)

Switching transistor

in the bias circuit