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參數資料
| 型號： | LA4742 |
| 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： | 6/9頁 |
| 文件大小： | 106K |
| 代理商： | LA4742 |
No. 7043-6/9
LA4742
Notes on Usage and Handling
Oscillator stabilization
In some cases, details of the printed circuit board layout may lead to induced parasitic oscillation. This oscillation can
be prevented by adding any one of the following components. Verify the optimal values for these capacitors by testing
in actual end products.
Technique 1 ... Connect Mylar capacitors (0.1 F) between the BTL amplifier outputs.
Technique 2 ... Connect an RC circuit (2.2
and 0.1 F in series) between each output and ground.
Audio quality (low band)
The low-band frequency characteristics can be improved by adjusting the values of the input capacitors. The
recommended value is 2.2 F.
Impulse noise
The LA4742 includes a built-in impulse noise suppression circuit. However, further improvement can be achieved by
using the muting circuit. When first applying power, activate the muting function at the same time as applying power.
Then, after the output DC potential has stabilized, turn off the muting function. When turning off the power, first
activate the muting function and then turn off the power. Sample transient responses are attached (see the timing
charts).
Transient Responses at Power On
Power on: Standby and muting activated at the same time.
Muting is turned off after the output has stabilized.
+
22
3.3
F
Mute
10 k
MUTE OFF
ON TIME
MUTE
External 10 k
muting switch
Standby pin
Output pin
5 [V]
0
4
2
0
200 ms/div
0 [V]
5 [V]
Standby set high
Transient Responses at Power Off
Power off: After activating the muting circuit, turn the power off.
+
22
3.3
F
Mute
10 k
MUTE
200 ms/div
5 [V]
0
4
2
0
0 [V]
5 [V]
External 10 k
muting switch
Standby pin
Output pin
Standby set low
相關PDF資料 |
PDF描述 |
|---|---|
| LA4743A | 28 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM25 |
| LA4743B | 28 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM25 |
| LA47501 | 29 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM25 |
| LA47503 | 29 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM25 |
| LA47510 | 48 W, 2 CHANNEL, AUDIO AMPLIFIER, ZFM25 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| LA4742-E | 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 |
| LA4742L-E | 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 |
| LA4743 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:45 W Four-Channel (Bridge Circuit) Power Amplifier |
| LA4743A | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:45 W Four-Channel (Bridge Circuit) Power Amplifier |
| LA4743B | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:45 W Four-Channel (Bridge Circuit) Power Amplifier |
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