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參數資料
| 型號： | LA4815M |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 0.62 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| 封裝： | 0.225 INCH, MFP-8 |
| 文件頁數： | 13/14頁 |
| 文件大小： | 233K |
| 代理商： | LA4815M |
LA4815M
5. Popping noise reduction during power-off
The power supply line can be directly controlled ON and OFF without using the mute function. However, when using
a high supply voltage, the shock noise and aftersound during power-off tends to worsen. One method of coping with
this is to connect a capacitor between Pin 6 (VCC) and Pin 7 (MUTE) as shown in Fig. 9 so that the auto mute function
operates during power-off.
Recommended value = 1
μF
+
Cmt
1
μF
CVCC
LA4815M
VCC
MUTE
6
7
Figure 9
6. Input coupling capacitor (Cin)
Cin is an input coupling capacitor, and is used for DC cutting. However, this capacitor is also used to improve the ripple
rejection ratio, which changes according to the capacitance value (recommended value = 1
μF). In addition, this
capacitor also affects the transient response characteristics during power-on and when mute is canceled, so the constant
should be set in consideration of these characteristics.
Design reference value = approximately 0.33 to 3.3
μF
Ripple rejection ratio : Increasing the capacitance value increases the rate, and reducing the value reduces the rate.
Rise response speed : Increasing the capacitance value reduces the speed, and reducing the value increases the
speed.
Popping noise : Increasing the capacitance value reduces the noise, and reducing the value increases the noise.
7. Output coupling capacitor (Cout)
Cout is an output coupling capacitor used for DC cutting. However, this capacitor, Cout, in combination with load
impedance RL forms a high-pass filter and attenuates the low frequency signal. Take into account the cutoff frequency
when determining the capacitance value. In addition, normally a chemical capacitor is used for this capacitor, but the
capacitance value of chemical capacitors decreases at low temperatures, so the value should be set in accordance with
this characteristic.
The cutoff frequency is expressed by the following formula.
fc = 1/(2
π × RL × Cout)
8. Output phase compensation capacitor (Cosc)
The Cosc capacitor is used to prevent output oscillation. Use a ceramic capacitor (recommended value = 0.1
μF) with
good high frequency characteristics, and locate this capacitor as close to the IC as possible.
9. Power supply capacitor (CVCC)
The CVCC capacitor is used to suppress the ripple component of the power supply line. Normally a chemical capacitor
(recommended value = 10
μF) is used for this capacitor. However, chemical capacitors have poor high frequency
characteristics, so when using a CPU, DSP or other IC that generates digital noise in the set, it is recommended that a
power supply bypass capacitor (ceramic capacitor, recommended value = approximately 0.1
μF) be added to reject
high-frequency components. Locate this bypass capacitor as close to the IC as possible.
No.A1373-8/14
相關PDF資料 |
PDF描述 |
|---|---|
| LA4815M | 0.62 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| LA4815 | 5 W, 2 CHANNEL, AUDIO AMPLIFIER, DIP28 |
| LA4815 | 5 W, 2 CHANNEL, AUDIO AMPLIFIER, DIP28 |
| LA4820M | 0.12 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO24 |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LA4815M_10 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Monaural Power Amplifier |
| LA4815M-TLM-H | 功能描述:功率放大器 MONAURAL POWER AMPLIFIER RoHS:否 制造商:TriQuint Semiconductor 封裝 / 箱體: 工作電源電壓:28 V 電源電流:2.5 A 工作溫度范圍: 封裝: |
| LA4815VH | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Monaural Power Amplifier |
| LA4815VH_12 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Monaural Power Amplifier |
| LA4815VH-MPB-H | 功能描述:音頻放大器 RoHS:否 制造商:STMicroelectronics 產品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
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