STK-4221 Ver la hoja de datos (PDF) - SANYO -> Panasonic
Número de pieza
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STK-4221 Datasheet PDF : 5 Pages
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STK4221II
Description of External Parts
C3, C4
C5, C6
C9, C10
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
Input filter capacitors
• A filter formed with R5 or R6 can be used to reduce noise at high frequencies.
Input coupling capacitors
• Used to block DC current. When the reactance of the capacitor increases at low frequencies, the dependence of 1/f noise on signal source
resistance causes the output noise to worsen. It is better to decrease the reactance.
• To reduce the pop noise at the time of application of power, it is effective to increase C5, C6 that fix the time constant on the input side and
to decrease C9, C10 on the NF side.
NF capacitors
• These capacitors fix the low cutoff frequency as shown below.
fL = 2----π----⋅---C--1--9----⋅---R---7-- [Hz]
To provide the desired voltage gain at low frequencies, it is better to increase C9. However, do not increase C9 more than needed because
the pop noise level becomes higher at the time of application of power.
Decoupling capacitor
• Used to eliminate the ripple components that mix into the input side from the power line (+VCC).
Bootstrap capacitors
• When the capacitor value is decreased, the distortion is liable to be higher at low frequencies.
Oscillation blocking capacitors
• Must be inserted as close to the IC power supply pins as possible so that the power supply impedance is decreased to operate the IC stably.
• Electrolytic capacitors are recommended for C17, C18.
Capacitor for ripple filter
• Capacitor for the TR10-used ripple filter in the IC system
Oscillation blocking capacitor
• A polyester film capacitor, being excellent in temperature characteristic, frequency characteristic, is recommended for C13, C14.
Resistors for input filter
Input bias resistors
• Used to bias the input pin potential to zero. These resistors fix the input impedance practically.
These resistors fix voltage gain VG.
It is recommended to use R7 (R8) = 560Ω, R9 (R10) = 56kΩ for VG = 40dB.
• To adjust VG, it is desirable to change R7 (or R8).
• When R7 (or R8) is changed to adjust VG, R3 (=R4) =R9 (=R10) must be set to ensure VN balance.
Bootstrap resistors
• The quiescent current is set by these resistors 4.7kΩ + 4.7kΩ. It is recommended to use this resistor value.
Resistor for ripple filter
• Limiting resistor for predriver TR at the time of load short
Used to ensure plus/minus balance at the time of clip.
Resistor for ripple filter
• When muting TR11 is turned ON, current flows from ground to -VCC through TR 11. It is recommended to use 1kΩ (1W) + 1kΩ (1W)
allowing for the power that may be dissipated on that occasion.
Oscillation blocking resistors
Output limiting resistors
For high-frequency oscillation blocking
For high-frequency oscillation blocking
No. 4611—4/5
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