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參數(shù)資料
| 型號(hào)： | STK4171V |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | AF Power Amplifier (Split Power Supply) (40W + 40W min, THD = 0.08%) |
| 中文描述： | 自動(dòng)對(duì)焦功率放大器（斯普利特電源）（功率40W功率40W分，總諧波失真\u003d 0.08％） |
| 文件頁(yè)數(shù)： | 6/8頁(yè) |
| 文件大?。?/td> | 247K |
| 代理商： | STK4171V |
STK4171
V
No. 2136—6/8
C3, C4
Input filter capacitors
A filter formed with R5 or R6 can be used to reduce noise at high frequencies.
C5, C6
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.
C9, C10
NF capacitors
These capacitors fix the low cutoff frequency as shown below.
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.
C19
Decoupling capacitor
Used to eliminate the ripple components that mix into the input side from the power line (+V
CC
).
C15, C16
Bootstrap capacitors
When the capacitor value is decreased, the distortion is liable to be higher at low frequencies.
C17, C18
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.
C20
Capacitor for ripple filter
Capacitor for the TR12-used ripple filter in the IC system
C13
Oscillation blocking capacitor
A polyester film capacitor, being excellent in temperature characteristic, frequency characteristic, is recommended for C13.
R5, R6
Resistors for input filter
R3, R4
Input bias resistors
Used to bias the input pin potential to zero. These resistors fix the input impedance practically.
R7, R9
(R8, R10)
These resistors fix voltage gain VG.
It is recommended to use R7 (R8) = 560
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 V
, R9 (R10) = 56k
for VG = 40dB.
N
balance.
R11, R20
(R12, R21)
Bootstrap resistors
The quiescent current is set by these resistors 3.3k
+ 3.3k
. It is recommended to use this resistor value.
R15
Resistor for ripple filter
(Limiting resistor for predriver TR at the time of load short)
R14
Used to ensure plus/minus balance at the time of clip.
R18, R19
Resistor for ripple filter
When muting TR13 is turned ON, current flows from ground to -V
allowing for the power that may be dissipated on that occasion.
CC
through TR 13. It is recommended to use 1k
(1W) + 1k
(1W)
R24, R25
Oscillation blocking resistors
R22, R23
Oscillation blocking resistors
L1, L2
Oscillation blocking coils
f
L
π
C
9
R
7
---------------------------
=
[Hz]
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