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参数资料
| 型号： | LM4752T/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 7 W, 2 CHANNEL, AUDIO AMPLIFIER, PZFM7 |
| 封装： | LEAD FREE, PLASTIC, TO-220, 7 PIN |
| 文件页数： | 7/22页 |
| 文件大小： | 521K |
| 代理商： | LM4752T/NOPB |
10003930
FIGURE 5. Bridge-Mode Application
10003931
10003937
FIGURE 6. THD+N vs. P
OUT for Bridge-Mode Application
PREVENTING OSCILLATIONS
With the integration of the feedback and bias resistors on-
chip, the LM4752 fits into a very compact package. However,
due to the close proximity of the non-inverting input pins to
the corresponding output pins, the inputs should be AC ter-
minated at all times. If the inputs are left floating, the amplifier
will have a positive feedback path through high impedance
coupling, resulting in a high frequency oscillation. In most ap-
plications, this termination is typically provided by the previ-
ous stage's source impedance. If the application will require
an external signal, the inputs should be terminated to ground
with a resistance of 50 k
or less on the AC side of the input
coupling capacitors.
UNDERVOLTAGE SHUTDOWN
If the power supply voltage drops below the minimum oper-
ating supply voltage, the internal under-voltage detection cir-
cuitry pulls down the half-supply bias line, shutting down the
preamp section of the LM4752. Due to the wide operating
supply range of the LM4752, the threshold is set to just under
9V. There may be certain applications where a higher thresh-
old voltage is desired. One example is a design requiring a
high operating supply voltage, with large supply and bias ca-
pacitors, and there is little or no other circuitry connected to
the main power supply rail. In this circuit, when the power is
disconnected, the supply and bias capacitors will discharge
at a slower rate, possibly resulting in audible output distortion
as the decaying voltage begins to clip the output signal. An
15
www.national.com
LM4752
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| LM4755MWC | 11 W, 2 CHANNEL, AUDIO AMPLIFIER, UUC |
| LM4755MDC | 11 W, 2 CHANNEL, AUDIO AMPLIFIER, UUC |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM4752TS | 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 |
| LM4752TS/NOPB | 功能描述:音频放大器 STEREO 11W AUDIO PWR AMP 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 |
| LM4753 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Dual 10W Audio Power Amplifier w/Mute, Standby and Volume Control |
| LM4753T | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| LM4755 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Stereo 11W Audio Power Amplifier with Mute |
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