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參數資料
| 型號： | LA4265 |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 3.5 W, 1 CHANNEL, AUDIO AMPLIFIER, PSFM10 |
| 封裝： | SIP-10 |
| 文件頁數： | 4/9頁 |
| 文件大小： | 136K |
| 代理商： | LA4265 |
LA4265
No.1463-4/9
Description of External Parts
C1 (330pF)
: Input short capacitor.
Reduces the high frequency noise when the input impedance is increased. Not required when the input
impedance is decreased.
C2 (100
μF) : Feedback capacitor.
Decreasing the capacitance value lowers the low frequency response. Increasing the capacitance value
makes the starting time later.
C3 (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.
C4 (470
μF) : Output capacitor.
Decreasing the capacitance value causes insufficient power at low frequencies.
C5 (470
μF) : Power capacitor.
Decreasing the capacitance value causes ripple to occur easily. Locating at a distance from the IC or
removing this capacitor may cause oscillation to occur.
C6 (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 (100k
Ω) : Input bias resistor.
Determines the bias (bias of zero potential) to be applied to the input pin and the input impedance. Not
required if a variable resistor is also used as this resistor.
R2 (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
The voltage gain can be reduced by adding an external resistor (RNF) in series with the feedback capacitor. (See VG
RNF characteristic curve). However, it should be noted that various characteristics are also changed (THD-VG,
VNO-VG, Vro-VG). The voltage gain must not be reduced to be less than 30dB. Since the frequency response is
extended and oscillation is liable to occur when the voltage gain is reduced, high-cut must be made as required.
(High-cut is made by connecting a capacitor of approximately 30pF across pins (6) and (7).)
External Muting
If external muting is required, make the circuit as shown on next page. In this case, the pop noise is similar to that which
occurs at the time of power switch ON/OFF. If the value of the series resistor is decreased, more pop noise is heard at
the time of attack ; if increased, muting is hard to work.
Measure against Fold-back of Output Waveform
Since the input pin is zero-biased, the circuit may be saturated at an overinput, causing a part of the output waveform to be
folded back (e. g. when the peak input voltage exceeds 600mV). In such a case, the fold-back of the waveform can be
prevented by using the built-in diode (also can be prevented by using an external diode). When the built-in diode is used,
a resistor must be connected in series with the input pin to cause the diode to conduct no overcurrent (10mA or less).
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相關代理商/技術參數 |
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|---|---|
| LA4266 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:3 W Monaural Power Amplifier |
| LA4267 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:5 W Monaural Power Amplifier |
| 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: |
| LA4270 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:2-CHANNEL AF POWER AMP FOR TAPE RECORDER RADIO |
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