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參數(shù)資料
| 型號(hào)： | LA4261 |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 3.5 W, 2 CHANNEL, AUDIO AMPLIFIER, PSFM10 |
| 文件頁(yè)數(shù)： | 4/9頁(yè) |
| 文件大?。?/td> | 202K |
| 代理商： | LA4261 |
LA4261
No.1321-4/9
Description of External Parts
C1, C4
(100
μF)
:
Feedback capacitor.
Decreasing the capacitance value lowers the low frequency response. Increasing the capacitance
value makes the starting time later.
C2, C3
(330pF)
:
Input short capacitor.
Reduces the high frequency noise when the input impedance is increased. Not required when the
input impedance is decreased.
C5, C7
(470
μF)
:
Output capacitor.
Decreasing the capacitance value causes insufficient power at low frequencies.
C6, C8
(0.1
μF polyester
film capacitor)
:
Oscillation blocking capacitor.
Decreasing the capacitance value causes oscillation to occur easily. Use a polyester film
capacitor that is good in high frequency response and temperature characteristic. The use of an
electrolytic capacitor may cause oscillation to occur at low temperatures.
C9
(470
μF)
:
Power capacitor.
Decreasing the capacitance value causes ripple to occur. Locating at a distance from the IC or
removing this capacitor may cause oscillation to occur.
C10
(100
μF)
:
Ripple filter capacitor.
Decreasing the capacitance value excessively or removing this capacitor causes ripple to occur.
However, increasing the capacitance value does not always cause ripple to be reduced.
Decreasing the capacitance value makes the starting time earlier.
R1, R2
(100k
Ω)
:
Input bias resistor.
Determines the bias (bias of GND potential) to be applied to the input pin and the input
impedance. Not required if variable resistors are used.
R3, R4
(3.3
Ω)
:
Resistor connected in series with oscillation blocking capacitor.
Prevents phase shift attributable to the oscillation blocking capacitor so that oscillation is hard to
occur.
Note for Changing Voltage Gain
Basically, the voltage gain can be reduced by adding external resistors (RNF)
in series with feedback capacitors C1, C4. However, it should be noted that
since there is no phase compensation pin the frequency response is extended
and oscillation is liable to occur when the voltage gain is reduced. The voltage
gain must not be reduced to be less than 30dB.
External Muting
If external muting is required, make the circuit as shown right. In this
case, the attack time, recovery time, and pop noise are similar to those
which occur at the time of power switch ON/OFF.
RNF
C1
C4
RNF
1
2
5
6
LA4261
220
Ω
VCC
muting SW
+
100
μF
100
μF
100
μF
1
2
3
5
6
9
10
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| LA4268 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:10 W Monaural Power Amplifier |
| LA4268-E | 制造商:Sony Semiconductor Solutions Division 功能描述: |
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