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參數資料
| 型號： | LA4743B |
| 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?。?/td> | 216K |
| 代理商： | LA4743B |
No. 6630-6/9
LA4743B
Notes on Usage and Handling
Oscillator stabilization time
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 LA4743B 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
MUTE OFF
ON TIME
5 [V]
0
4
2
0
200 ms/div
0 [V]
5 [V]
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]
Standby set high
External 10 k muting switch
Standby pin
Output pin
Standby set low
External 10 k muting switch
Standby pin
Output pin
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| LA47501 | 29 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM25 |
| LA47503 | 29 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM25 |
| LA47510 | 48 W, 2 CHANNEL, AUDIO AMPLIFIER, ZFM25 |
| LA47516 | 29 W, 4 CHANNEL, AUDIO AMPLIFIER, ZFM25 |
| LA47536 | 28 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM25 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| LA4743J | 制造商:Panasonic Industrial Company 功能描述:IC |
| LA4743K-E | 制造商:Sony Semiconductor Solutions Division 功能描述: |
| LA474M | 制造商:Cornell Dubilier Electronics 功能描述: 制造商:Mallory Sonalert Products Inc 功能描述: |
| LA47501 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:BTL4ch(50W】4) |
| LA47503 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:High-Output (50-Watt Class) Four-Channel Car Stereo BTL Power Amplifier IC Series |
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