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参数资料
| 型号： | LA4815M |
| 厂商： | SANYO SEMICONDUCTOR CO LTD |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 0.62 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| 封装： | 0.225 INCH, MFP-8 |
| 文件页数： | 12/14页 |
| 文件大小： | 233K |
| 代理商： | LA4815M |
LA4815M
3. Mute control pin (Pin 7)
The internal power amplifier circuit can be disabled and audio mute is turned on by controlling the voltage applied to
Pin 7. Control can be performed directly using the CPU output port, but digital noise from the CPU may worsen the
LA4815M noise floor. Therefore, inserting a series resistor, Rm1 (1 to 2.2k
Ω) as shown in Fig. 6, is recommended.
Mute ON : Low
Mute OFF : High or open
In addition, the Pin 7 DC voltage is dependent on the supply voltage, so a reverse current flows to the CPU power
supply line when the Pin 7 voltage is higher than the CPU supply voltage. In these cases, connect a resistor, Rm2 (see
Fig. 7) between Pin 7 and GND to lower the Pin 7 DC voltage as shown in Fig. 6.
Note that when not using the mute function, Pin 7 must be left open.
Rm1
* For reverse
current prevention
1k
Ω
Rm2
VDD
VSS
CPU
I/O
port
LA4815M
GND
VCC
30k
Ω
30k
Ω
40k
Ω
10k
Ω
7
Figure 6
Reverse current prevention resistor value : Rm2 (reference value)
← When V7 is set to approximately 2.5V
Rm2 – VCC
10
100
7
5
3
2
7
5
3
2
1000
711
13
91
Supply voltage, VCC –V
Impedance,
Rm2
–
kΩ
5
Figure 7
4. Mute control timing
When performing mute control, exercise control at the timing shown in Fig. 8.
During power-on : Twu = 0 to 50ms
* Pins 6 and 7 can also rise simultaneously.
During power-off : Twd = 100 to 200ms
Pin 6
(VCC)
Pin 7
(MUTE)
Twd
Twu
Figure 8
No.A1373-7/14
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LA4815M_10 | 制造商:SANYO 制造商全称: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 封装 / 箱体: 工作电源电压:28 V 电源电流:2.5 A 工作温度范围: 封装: |
| LA4815VH | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:Monaural Power Amplifier |
| LA4815VH_12 | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:Monaural Power Amplifier |
| LA4815VH-MPB-H | 功能描述:音频放大器 RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
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