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參數(shù)資料
| 型號(hào)： | LA4277 |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 5 W, 2 CHANNEL, AUDIO AMPLIFIER, SFM10 |
| 封裝： | SIP-10 |
| 文件頁(yè)數(shù)： | 3/7頁(yè) |
| 文件大?。?/td> | 129K |
| 代理商： | LA4277 |
LA4277
No.7095-3/7
Pin Assignment and Block Diagram
LA4277
NF1
IN1
Filter
PRE GND
IN2
NF2
OUT2
OUT1
RL
VCC
Power GND
Top view
0.1
μ
F
1000
μ
F
1000
μ
F
C9
RL
1000
μ
F
C6
C10
C8
56
Ω
20k
Ω
20k
Ω
1.0
Ω
R7
0.1
μ
F
C7
1.0
Ω
R6
100
μ
F
C5
4.7
μ
F
C4
100
μ
F
C3
100
μ
F
C1
C2
150
Ω
R5
R4
56
Ω
100k
Ω
R3
200k
Ω
R2
100k
Ω
R1
150
Ω
2
3
4
5
6
7
8
9
10
1
+
4.7
μ
F
* For Muting, add a resistor between pin 3 and GND. 750
Ω for the LA4266/67/68, 200Ω for the LA4276/77.
Description of External Parts
C1, C5
: Feedback capacitors
Decreasing the capacitance value lowers the low frequency response. Increasing the capacitance value
makes the starting time later.
C2, C4
: Input capacitors
C3
: Ripple filter capacitor
Decreasing the capacitance value too far or eliminating it altogether causes ripple to occur. However, ripple
is not necessarily reduced if the capacitance value is increased. This capacitor also affects the starting time;
decreasing the capacitance value makes the starting time earlier.
C6, C9
: Output capacitors
Decreasing the capacitance value causes insufficient power at low frequencies.
C7, C10
: Oscillation blocking capacitors
Decreasing the capacitance value causes oscillation to occur easily. Use a mylar film capacitor that has
good high frequency response and temperature characteristics. The use of an electrolytic capacitor or a
ceramic capacitor may cause oscillation to occur at low temperatures.
C8
: Power capacitor
Decreasing the capacitance value causes ripple to occur easily. Locating this capacitor at a distance from
the IC or removing this capacitor may cause oscillation to occur.
R1, R5
: Feedback resistors
Refer to supplementary discussion “Voltage Gain.”
R2, R4
: Input bias resistors
These determine the bias (GND potential bias) and the input impedance of the input pins. If a variable
resistor or other device also serves this function, these resistors can be omitted.
R3
: Muting resistor
Refer to supplementary discussion “External Muting.”
R6, R7
: Resistors connected in series with oscillation blocking capacitor
These prevent phase shift in conjunction with the oscillation blocking capacitor so that oscillation does not
easily occur. There is an optimal value for the resistor; increasing or decreasing the resistance causes
oscillation to occur easily.
External Muting
Pull down the electric potential of the ripple filter pin (pin 3).
Muting becomes possible by inserting the discharge resistor R3
between pin 3 and GND. If the resistance value of R3 is too low,
a popping noise is generated; if the resistance value is too high,
the muting effect is reduced. (A value of 200
Ω is recommended
for R3.)
23
4
+
C3
R1
Mute SW
IN1
Filter
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LA4277-E | 制造商:Sony Semiconductor Solutions Division 功能描述: |
| LA4278 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:10 W 2-Channel Power Amplifier |
| LA4278-E | 制造商:Sony Semiconductor Solutions Division 功能描述: |
| LA4280 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:2-Channel 10W AF Power Amp for Home Stereo, TV Use |
| LA4280-E | 制造商:Sony Semiconductor Solutions Division 功能描述: |
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