STK433-290-E Ver la hoja de datos (PDF) - SANYO -> Panasonic

Número de pieza

componentes Descripción

Fabricante

STK433-290-E

3-channel class AB audio power IC 80W+80W+80W

SANYO -> Panasonic 

STK433-290-E

[STK433-300 series Stand-By Control Using Example]

Characteristic

• It can largely improve a pop noise to occur in power supply ON/OFF by using recommended Stand-By Control

Application.

• Because It can perform Stand-By Control by regulating limit resistance to the voltage such as used microcomputers, a

set design is easy.

(ex) STK433-300series test circuit. When impressed by Stand-by control control [+5V].

Concerning pin 13 reference

voltage VST

2.7kΩ(*1)

ΔVBE

Sink current IST

1kΩ

33kΩ

33μF

(*3)

Stand-by Control

H: Operation Mode (+5V)

L: Stand-by Mode (0V)

2kΩ

(*4)

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

-PRE -VCC +VCC Ch1 Ch1 Ch2 Ch2 +PRE SUB GND

OUT OUT OUT OUT

Ch1 Ch1 ST-

IN NF BY

Ch2 Ch2 Ch3 Ch3 Ch3 Ch3

NF

IN

IN NF OUT OUT

STK433-300 series

ΔVBE

Bias Circuit

4.7kΩ(*2)

in PreDriver IC

ex) Stand-By control voltage=+5V

VST=(5V-VBE×2)×4.7kΩ/((*1)+4.7kΩ)+VBE

=(5V-0.6V×2)×4.7kΩ/(4.7kΩ+2.7kΩ)+0.6V

≈3.0(V)

Operation Explanation

(1) Concerning pin 13 reference voltage VST

<1> Operation mode

The SW transistor of bias circuit is turned on at VST≥2.5V, and the amplifier becomes operation mode.

ex) VST=2.5V

VST=(*2)×IST+0.6V→2.5V=4.7kΩ×IST+0.6V, IST≈0.40mA

<2> Standby mode

The SW transistor of Pre-driver IC is turned off at VST≤0.6V (typ0V), and the amplifier becomes Stand-By

Mode.

ex) VST=0.6V

VST=(*2)×IST+0.6V→0.6V=4.7kΩ×IST+0.6V, IST≈0mA

(*3) It can improve a pop noise at power up time by giving a time constant of the condenser during operation.

(*4) Please decide a time constant to discharge the condenser during standby.

No. A1630-10/13

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