STK433-060-E 查看數據表（PDF） - SANYO -> Panasonic

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STK433-060-E

Thick-Film Hybrid IC 2-channel class AB audio power IC, 60W+60W

SANYO -> Panasonic 

STK433-070-E

STK433-000 Series Application Explanation

STK433-000 series

Stand-by Circuit

in Pre Driver IC

SW transistor

ΔVBE

Ch1 Ch1 Ch2 Ch2

-PRE -VCC +VCC OUT(+) OUT(-) OUT(+) OUT(-) +PRE SUB GND

Ch1 Ch1

IN NF ST-BY

12

3

4

5

6

78

9 10 11 12 13

4.7kΩ (*3)

Ch2 Ch2

NF IN

14 15

1) Stand-by control circuit part

H: Operation mode (+5V)

L: Stand-by mode (0V)

1kΩ

56kΩ 6.8kΩ

56kΩ 6.8kΩ

Point.B

Tr1

Tr2

Point.B

Point.C

(2) Load short

detection part

Point.C

I2

(*1) R1 Tr5

33kΩ

Stand-By control

I1

ex)5.1kΩ

Voltage VST

33μF

2kΩ

22kΩ

56kΩ

Tr4

1kΩ

0.1μF10kΩ

100kΩ

(*4) R2

Tr3

Operate mode (VSTOFF) ≥ 2.5V

Stand-By mode (VSTON) < 0.6V (0V typ)

I3

(3) Latch-up

circuit part

OUT Ch1

OUT Ch2

82kΩ

22μF

82kΩ 22μF

-VCC

Tr5

100

kΩ

Tr6

(4) DC offset

protection

The protection circuit application for the STK433-000sr consists of the following blocks (blocks (1) to (4)).

(1) Standby control circuit block

(2) Load short-circuit detection block

(3) Latch-up circuit block

(4) DC voltage protection block

1) Standby control circuit block

Concerning pin 13 reference voltage VST

<1> Operation mode

The switching transistor of the predriver IC turns on when the pin 13 reference voltage, VST, becomes greater

than or equal to 2.5V, placing the amplifier into the operation mode.

Example: When VST (min.) = 2.5V

I1 is approximately equal to 0.40mA since VST = (*2) × IST + 0.6V → 2.5V = 4.7kΩ × IST + 0.6V.

<2> Standby mode

The switching transistor of the predriver IC turns off when the pin 13 reference voltage, VST, becomes lower

than or equal to 0.6V (typ. 0V), placing the amplifier into the standby mode.

Example: When VST = 0.6V

I1 is approximately equal to 0mA since VST = (*2) × IST + 0.6V → 0.6V = 4.7kΩ × IST + 0.6V.

(*1) Limiting resistor

Determine the value of R1 so that the voltage VST applied to the standby pin (pin 13) falls within the rating

(+2.5V to 5.5V (typ. 3.0V)).

(*2) The standby control voltage must be supplied from the host including microcontrollers.

(*3) A 4.7kΩ limiting resistor is also incorporated inside the hybrid IC (at pin 13).

No. A1488-9/11

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