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參數(shù)資料
| 型號： | LA47536 |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 28 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM25 |
| 封裝： | HZIP-25 |
| 文件頁數(shù)： | 3/7頁 |
| 文件大小： | 83K |
| 代理商： | LA47536 |
No.7901-3/7
LA47536
Functional Description
1. Standby Switch Function (pin 4)
The pin 4 threshold voltage is set to be 2 VBE. When Vst is 2.0V or higher, the amplifier will be on, and when Vst is
0.7V or lower, the amplifier will be off. Note that pin 4 requires an operating current of at least 40A.
2. Muting Function
The IC is set to the muted state by setting pin 22 to the ground potential. In this state, the audio output is muted. The
time constant with which the muting function operates is set by an external RC circuit, and this time constant
influences the pop noise that occurs when the amplifier is turned on or off.
The muting on and off times due to the recommended external component values (R=10k
, C=3.3F) are as follows.
Muting on time: 50ms
Muting off time: 20ms
3. Self-Diagnosis Function (Speaker burnout prevention)
During steady state operation, the LA47536 detects, internally, whether or not an abnormal amplifier output offset
has occurred, and outputs this signal from pin 25. Applications can prevent speaker burnout and other problems by
having the system microcontroller detect this pin 25 output signal and control either the standby state or the power
supply. (An abnormal output offset may be caused by, for example, input capacitor leakage current.)
The pin 25 signal is turned off by setting pin 1 to the ground potential.
4. Oscillator Stability
In some cases, parasitic oscillations may be induced by the PCB layout. This oscillation can be eliminated by adding
the components listed below. Note that the optimal capacitor value must be verified by testing in the actual mounted
state in the end product.
Connect a capacitor and resistor (0.1F and 2.2
) in series between each output pin and ground.
5. Audio Quality (Low band)
The frequency characteristics in the low frequencies can be improved by making the capacitance of the input
capacitors variable.
The recommended capacitance is 2.2F and smaller.
6. Protection Circuits
Do not ground the outputs with the STBY voltage at around 1.4V. Also, do not turn the IC off in the grounded state
with a time constant provided for the STBY voltage.
7. Pop Noise
Although the LA47536 includes an pop noise prevention circuit, pop noise can be reduced even further by using the
muting function as well.
Activate the muting function at the same time as power is applied. Then, after the output DC potential has
stabilized, turn off the muting function.
When turning the amplifier off, first turn on the muting function and then turn off the power supply.
These two methods are effective at minimizing pop noise.
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| LA4800V | 0.025 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO16 |
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| LA4809M | 0.16 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO12 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LA47536-E | 功能描述:音頻放大器 RoHS:否 制造商:STMicroelectronics 產(chǎn)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 |
| LA4763-E | 制造商:Sony Semiconductor Solutions Division 功能描述: |
| LA4800 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:3 V Stereo Headphone Power Amplifier |
| LA4800V | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:3 V Stereo Headphone Power Amplifier |
| LA4801 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Headphone Stereo Power Amplifier |
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