STK4201II データシートの表示（PDF） - SANYO -> Panasonic
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STK4201II Datasheet PDF : 7 Pages
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STK42012
External Component Description
C3, C4
C5, C6
C9, C10
Input filter capacitors.
These, together with R5 and R6, form filters to reduce high-band noise.
Input coupling capacitors.
For DC blocking. Since capacitor reactance becomes larger at lower frequencies, the output noise can be adversely affected by
signal source resistance-dependent 1/f noise. In this case, a lower rectance value should be chosen. In order to remove pop noise
at power-on, larger values of capacitance should be chosen for C5 and C6, which determin the input time constant, and smaller
values for C9 and C10 in the NF circuit.
NF capacitors.
These determine the low-side cutoff frequency.
fL=
2π
×
1
C9
×
R7
[Hz]
C19
C15, C16
C17, C18
C20
C13, C14
R5, R6
R3, R4
R7, R9
(R8, R10)
R11, R20
(R12, R21)
R15
R14
R18, R19
R24, R25
R16, R17
R22, R23
L1, L2
A large values should be chosen for C9 to maintain voltage gain at low frequencies. However, because this would tend to increase
the shock noise at power-on, a values larger than absolutely necessary should be avoided.
Decoupling capacitors.
This removes shock noise and ripple voltage from the supply.
Bootstrap capacitors.
If these capacitors are made small, then the total harmonic distortion at low frequencies increases significantly.
Oscillation prevention capacitors.
These should be inserted as close as possible to the IC supply pins to reduce supply impedance and hence provide stable IC
operation. Electolytic capacitors are recommended.
Ripple filter capacitor.
This forms a ripple filter in combinatin with internal transistor TR10.
Oscillation prevention capacitors.
Mylar capacitors are recommended for their excellent thermal and frequency characteristics.
Input filter resistors.
Input bias resistors.
These are used to bias the input pins at aero potential. The input impedance is largely determined by this resistance.
Voltage-gain VG setting resistors.
VG=40dB is recommended using R7, R8=560Ω, and R9, R10=56kΩ. Gain adjustments are best made using R7 and R8. If gain
adjustments are made using R7 and R8, then set R3, R4=R9, R10 to maintain VN balance stability.
Bootstrap resistors.
These resistors determine the quiescent current. Values of 4.7kΩ and 4.7kΩ are recommended.
Ripple filter tesistor.
This resistor performs as predriver transistor limiting resistor during load short circuits.
Clipping plus/minus balance resistor.
Ripple filter resistors.
When muting transistor TR11 is on, current flows from ground through TR11 to –VCC. Values of 1kΩ (1W) and 1kΩ (1W) are
recommended.
Oscillation prevention resistors.
Output limiting resistors.
High-frequency oscillation prevention resistors.
High-frequency oscillation prevention inductors.
No.4609–4/7
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