STK433-730-E Sanyo Semicon Device, STK433-730-E Datasheet - Page 6

• Manufacturer Part Number: STK433-730-E
• Description: 2-channel class AB audio power IC 30W+30W
• Manufacturer: Sanyo Semicon Device

Recommended Values for Application Parts (for the test circuit)
R01
R03
R11, 12
R13, 14
R15, 16
R21, 22
R23, 24
R25, 26
R27, 28
C01, 02
C03
C05
C11, 12
C13, 14
C21, 22
C23, 24
C25, 26
C27, 28
L11, 12
Symbol
Recommen
ded Value
4.7Ω/1W
0.01μF
2200pF
100μF
200μF
470pF
1.8kΩ
0.1μF
2.2μF
56kΩ
56kΩ
10μF
4.7Ω
47Ω
12pF
1kΩ
3kΩ
1μH
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Ripple filtering resistors (Fusible resistors are desirable)
(Used with C03 to form a ripple filter.)
Use a limiting resistor according to the stand-by control voltage in order to control the stand-by pin voltage VST within the
rating.
Noise-absorbing resistors
Oscillation prevention
Used with R23 and R24 to determine the voltage gain VG.
Input filtering resistor
Used with R15 and R16 to determine the voltage gain VG. (VG
should desirably be determined by the R23 and R24 value.)
Input bias resistors (Virtually determine the input impedance.)
Oscillation prevention
Oscillation prevention
Decoupling capacitors.
A detection voltage appears during the protection operation. Adjust the time constant (when the detection pin is to be
used).
Oscillation prevention (Mylar capacitors are recommended.)
Oscillation prevention
Input filter capacitor
(Used with R21 and R22 to form a filter that suppresses high-
frequency noises.)
Input coupling capacitor (block DC current)
NF capacitor
(Changes the low cutoff frequency; f L =1/ (2π • C25 • R23)
Oscillation prevention
Oscillation prevention
• Insert the capacitors as close to the IC as possible to decrease
• Eliminate ripple components that pass into the input side from
the power line. (Used with R01 to form a filter.)
the power impedance for reliable IC operation (use of
electrolytic capacitors are desirable).
Description
STK433-730-E
Decreased pass-
through current at high
frequencies.
VN offset
(Ensure R15=R25, R16=R26 when changing.)
Likely to oscillate
(VG<30dB)
Likely to oscillate
Increase in ripple components that pass into the
input side from the power line.
Likely to oscillate
Likely to oscillate
Increase in low-
frequency voltage gain,
with higher pop noise
at power-on.
Likely to oscillate
None
Recommended Value
Larger than
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Increased pass-
through current at high
frequencies.
None
(VG≤42dB)
Decrease in low-
frequency voltage gain
Likely to oscillate
Recommended Value
Smaller than
No. A1249-6/12
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