STK433-090-E 데이터 시트보기 (PDF) - SANYO -> Panasonic
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STK433-090-E Datasheet PDF : 11 Pages
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STK433-090-E
STK433-100 Series Application Explanation
STK433-100 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
Ch2 Ch2
NF IN
14 15
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
IST
ex) 13kΩ
33μF
22kΩ
56kΩ
Tr4
1kΩ
0.1μF10kΩ
100kΩ
(*4) R2
Tr3
I3
(3) Latch-up
circuit part
1) Stand-by control circuit part
H: Operation mode (+5V)
L: Stand-by mode (0V)
1kΩ
33kΩ
2kΩ
(*2)
ex) +5V
OUT Ch1
OUT Ch2
82kΩ
22μF
82kΩ 22μF
-VCC
Tr5
100
kΩ
Tr6
(4) DC offset
protection
The protection circuit application for the STK433-100sr 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
(Reference example) STK433-100 series test circuit (when +5V is applied to Stand-by control.)
(*1) R1
13kΩ
ΔVBE
Sink current IST
1kΩ (*3)
33kΩ
1) Stand-by control
H: Operation mode (+5V)
L: Stand-by mode (0V)
VST
33μF
(*2)
2kΩ (*3)
12
3
-PRE -VCC +VCC
4
Ch1
OUT
5
Ch1
OUT
6
Ch2
OUT
7 8 9 10
Ch2 +PRE SUB GND
OUT
11 12 13
Ch1 Ch1 ST-BY
IN NF
STK433-100series
ΔVBE
Stand-by Circuit
in Pre Driver IC
14 15
Ch2 Ch2
NF IN
ex) Stand-by control voltage=+5V
IST=(VST-VBE*2)/R1
=(5-0.6*2)/13kΩ
≈0.3(mA)
Concerning pin 13 reference voltage VST
<1> Operation mode
The switching transistor in the bias circuit turns on and places the amplifier into the operating mode when the
current flowing into pin 13 (IST) becomes 0.25mA or greater.
<2> Standby mode
When the current flowing into pin 13 (IST) is stopped (=0mA), the switching transistor in the bias circuit turns
off, placing the amplifier into the standby mode.
(*1) The current limiting resistor (R1) must be used to ensure that the current flowing into the stand-by pin
(pin 13) does not exceed its maximum rated value IST 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 (*3) is discharged in standby mode.
No. A1248-9/11
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