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STK433-070-E Datenblatt(PDF) 10 Page - Sanyo Semicon Device

Teilenummer STK433-070-E
Bauteilbeschribung  Thick-Film Hybrid IC 2-channel class AB audio power IC, 60W60W
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Hersteller  SANYO [Sanyo Semicon Device]
Direct Link  https://www.sanyo-av.com/us/
Logo SANYO - Sanyo Semicon Device

STK433-070-E Datenblatt(HTML) 10 Page - Sanyo Semicon Device

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STK433-070-E
No. A1488-10/11
2) Load short-circuit 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
TR3 is activated when I2 is supplied to the latch-up circuit.
When TR3 turns on and current I3 starts flowing, VST goes down to 0V (standby mode), protecting the power
amplifier.
Since TR3 and TR4 configure a thyristor, once TR3 is activated, the IC is held in the standby mode.
To release the standby mode and reactivate the power amplifier, it is necessary to set the standby control voltage (*2)
temporarily low (0V). Subsequently, when the standby control is returned to high, the power amplifier will become
active again.
(*4) The I3 value varies depending on the supply voltage. Determine the value of R2 using the formula below, so that
I1 is equal to or less than I3.
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," 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 82k
Ω resistor. Furthermore, the time constant must be determined using
22
μ//22μ capacitors to prevent the amplifier from malfunctioning due to the audio signal.
STK433-000 Series BTL Application
2
3
4
5
67
8
9
10
11
12
13
14
1
15
+VCC
-VCC
STK433-000-E series
OUT
10
μF
/10V
4.7
Ω
0.1
μF
56k
Ω
3pF
56k
Ω
3pF
GND
Ch1 IN
2.2
μF
/50V
1k
Ω
+VCC
Ch1
IN
Ch1
NF
Ch2
IN
Ch2
NF
Ch2
OUT
Ch1
OUT
-VCC
SUB
GND
+PRE
ST-BY
100
μF
/100V
1.8k
Ω
100
μF
/100V
1.8k
Ω
Stand-By control
Voltage VST
Ch1
OUT
Ch2
OUT
-PRE
100
Ω
/1W
3
μH
100pF
0.22
Ω
0.22
Ω
4.7
Ω
3
μH
4.7
Ω/1W
0.1
μF
4.7
Ω
/1W
RL=8Ω
56k
Ω
33
μF
33
μF
10
μF
/10V
100
Ω/1W
100
μF
/100V
(*1) R1
(*1) The voltage applied to the Stand-by pin (#13) must not
exceed the maximum rated value (VST max).


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