STK4432 查看數據表（PDF） - SANYO -> Panasonic
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STK4432 Datasheet PDF : 7 Pages
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Description of External Parts
STK4432
C1, C2
C3, C4
C5, C6
C15
R7, R8
R11
C9, C10
R1, R2
R12
R3, R5
(R4, R6)
C7, C8
R13
C11, C12
C13
C14
R9, R10
Input filter capacitors
• A filter formed with R1 or R2 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.
NF capacitors
• These capacitors fix the low cutoff frequency shown below.
fL = 2----π------⋅----C--1---5-----⋅----R----3-- Hz
To provide the desired voltage gain at low frequencies, it is better to increase C5. However, do not increase C5 more than needed because
the pop noise level becomes higher at the time of application of power.
Capacitor for ripple filter
• Used to eliminate the ripple components that mix into the input side from the power line (+VCC).
Front stage bias resistors
Front stage bias resistor
Oscillation blocking capacitors
• A polyester film capacitor, being excellent in temperature characteristic, frequency characteristic, is recommended for C9, C10.
Resistors for input filter
Front stage bias resistor
These resistors fix voltage gain VG.
It is recommended to use R3 (R4) = 12Ω for VG = 40dB.
• To adjust VG, it is desirable to change R3 (or R4).
Bootstrap capacitors
• When the capacitor value is decreased, the distortion is liable to be higher at low frequencies.
Resistor for ripple filter
(Limiting resistor for predriver TR at the time of load short)
Output capacitors
• These capacitors fix the low cutoff frequency.
Oscillation blocking capacitor
• 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.
Decoupling capacitor
• When the capacitor value is increased, the starting time is made longer.
Oscillation blocking resistors
No. 2885—5/7
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