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STK433-030-E Fiches technique(PDF) 9 Page - Sanyo Semicon Device

No de pièce STK433-030-E
Description  2-channel class AB audio power IC, 30W30W
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Fabricant  SANYO [Sanyo Semicon Device]
Site Internet  https://www.sanyo-av.com/us/
Logo SANYO - Sanyo Semicon Device

STK433-030-E Fiches technique(HTML) 9 Page - Sanyo Semicon Device

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STK433-030-E
No. A1247-9/11
STK433-000 Series Application Explanation
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 4.7k
Ω limiting resistor is also incorporated inside the hybrid IC (at pin 13).
2
3
4
5
6
7
8
9
10
11
12
13
14
1
15
OUT Ch1
STK433-000 series
56k
Ω
I1
+VCC
Ch1
IN
Ch1
NF
Ch2
IN
Ch2
NF
Ch2
OUT(-)
Ch1
OUT(+)
-VCC
SUB GND
+PRE
ST-BY
Ch1
OUT(-)
Ch2
OUT(+)
-PRE
6.8k
Ω
56k
Ω
6.8k
Ω
(2) Load short
detection part
22k
Ω
56k
Ω
1k
Ω
0.1
μF10kΩ
100k
Ω
1k
Ω
33k
Ω
2k
Ω
(*1) R1
ex) 5.1k
Ω
33
μF
OUT Ch2
82k
Ω
82k
Ω
100
k
Ω
22
μF
22
μF
1) Stand-by control circuit part
H: Operation mode (+5V)
L: Stand-by mode (0V)
Point.B
Point.B
Point.C
Point.C
Tr1
Tr2
Stand-by Circuit
in Pre Driver IC
SW transistor
ΔVBE
4.7k
Ω (*3)
Stand-By Control
Voltage VST
(*4) R2
I2
I3
Operate mode (VSTOFF) ≥ 2.5V
Stand-By mode (VSTON) < 0.6V (0V typ)
(3) Latch-up
circuit part
(4) DC offset
protection
Tr4
Tr5
Tr3
Tr5
Tr6
-VCC


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