STK433-300-E データシートの表示（PDF） - SANYO -> Panasonic
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STK433-300-E Datasheet PDF : 13 Pages
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STK433-290-E
1) Stand-by control circuit block
(Reference example) STK433-300-E series test circuit (when +5V is applied to Stand-by control.)
VST
(*1) R1
2.7kΩ
ΔVBE
1kΩ (*3)
33kΩ
33μF
(*2)
Stand-by Control Voltage
H: Operation Mode (+5V)
L: Stand-by Mode (0V)
2kΩ
(*3)
12
-PRE -VCC
3
+VCC
4
Ch1
OUT
5
Ch1
OUT
6
Ch2
OUT
78
Ch2 +PRE
OUT
9 10
SUB
GND
11 12 13 14 15 16 17 18 19
Ch1 Ch1 ST-BY Ch2 Ch2 Ch3 Ch3 Ch3 Ch3
IN NF
NF IN IN NF OUT OUT
STK433-300-E series
4.7kΩ
ΔVBE
Stand-By Circuit
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)
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
voltage flowing into pin 13 (VST) becomes 0.25V or greater.
<2> Stand-By Mode
When the voltage flowing into pin 13 (VST) is stopped (=0V), 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 voltage flowing into the stand-by pin (pin 13)
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 standby mode.
2) Load short detection block
Since the voltage between point B and point C is less than 0.6V in normal operation mode (VBE < 0.6V) and TR1 (or
TR2) is not activated, the load short-circuit detection block does not operate.
When a load short-circuit occurs, however, the voltage between point B and point C becomes larger than 0.6V,
causing TR1 (or TR2) to turn on (VBE > 0.6V), and current I2 to flows
3) Latch-up circuit block
When I2 was supplied to latch-up circuit, TR3 operate.
VST becomes Stand-By Mode (0V) when TR3 operates (I3 flows), the power amplifier is protected.
Stand-By Mode is maintained when once TR3 operates because TR3 and TR4 compose the thyristor.
It is necessary to make the Stand-By Control voltage (*2) L (0V) once to release Stand-By mode and to make the
power amplifier operate again.
After, when Stand-By Control (*2) is returned to H (ex, +5V), it operates again.
(*4) I3 is changed depending on the power-supply voltage (-VCC).
Please set resistance (R2) to become I1 < I3 by the following calculation types.
I1 ≤ I3 = VCC/R2
4) DC offset protection block
The DC offset protection circuit is activated when ±0.5V (typ) voltage is applied to either "OUT CH1" or "OUT
CH2," or "OUT CH3," and the hybrid IC is shut down (standby mode). To release the IC from the standby mode and
reactivate the power amplifier, it is necessary to set the standby control voltage temporarily low (0V). Subsequently,
when the standby control is returned to high (+5V, for example), the power amplifier will become active again.
The protection level must be set using the 82kΩ resistor. Furthermore, the time constant must be determined using
22μ//22μ capacitors to prevent the amplifier from malfunctioning due to the audio signal.
No. A1630-12/13
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