STK433-240A-E SANYO Semiconductor, STK433-240A-E Datasheet - Page 10

• Manufacturer Part Number: STK433-240A-E
• Description: 3-channel class AB audio power IC
• Manufacturer: SANYO Semiconductor

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2) Load short detection block
3) Latch-up circuit block
4) DC offset protection block
Since the voltage between point B and point C is less than 0.6V in normal operation mode (V BE < 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 (V BE > 0.6V), and current I2 to flows
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 (-V CC ).
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.
Please set resistance (R2) to become I1 < I3 by the following calculation types.
This catalog provides information as of November, 2009. Specifications and information herein are subject
to change without notice.
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I1 ≤ I3 = V CC /R2
STK433-240A-E
PS
No. A1490-10/10