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参数资料
| 型号： | LM4865MDC |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 音频控制 |
| 英文描述： | 1 CHANNEL(S), VOLUME CONTROL CIRCUIT, UUC |
| 封装： | DIE |
| 文件页数： | 14/18页 |
| 文件大小： | 520K |
| 代理商： | LM4865MDC |
Typical Performance Characteristics (Continued)
Application Information
BRIDGE CONFIGURATION EXPLANATION
As shown in
Figure 1, the LM4865 consists of two opera-
tional amplifiers internally. An external DC voltage sets the
closed-loop gain of the first amplifier, whereas two internal
20k
resistors set the second amplifier’s gain at -1. The
LM4865 can be used to drive a speaker connected between
the two amplifier outputs or a monaural headphone con-
nected between V
O1 and GND.
Figure 1 shows that the output of Amp1 serves as the input
to Amp2. This results in both amplifiers producing signals
that are identical in magnitude, but 180 out of phase.
Taking advantage of this phase difference, a load placed
between V
O1 and VO2 is driven differentially (commonly
referred to as “bridge mode“ ). This mode is different from
single-ended driven loads that are connected between a
single amplifier’s output and ground.
Bridge mode has a distinct advantage over the single-ended
configuration: its differential drive to the load doubles the
output swing for a specified supply voltage. This results in
four times the output power when compared to a
single-ended amplifier under the same conditions. This in-
crease in attainable output assumes that the amplifier is not
current limited or the output signal is not clipped. To ensure
minimum output signal clipping when choosing an amplifier’s
closed-loop gain, refer to the Audio Power Amplifier De-
sign section.
THD+N vs Output Power
DS101025-24
THD+N vs Output Power
DS101025-28
Output Power vs Load Resistance
DS101025-29
Clipping Voltage vs Supply Voltage
DS101025-30
Output Power vs Supply Voltage
DS101025-31
Output Power vs Supply Voltage
DS101025-32
Supply Current vs Supply Voltage
DS101025-33
LM4865
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PDF描述 |
|---|---|
| LM4865MWC | 1 CHANNEL(S), VOLUME CONTROL CIRCUIT, UUC |
| LM4866MTE/NOPB | 3.2 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO20 |
| LM4866MT/NOPB | 1.5 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO20 |
| LM4866LQ/NOPB | 3.2 W, 2 CHANNEL, AUDIO AMPLIFIER, PQCC24 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM4865MM | 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 |
| LM4865MM/NOPB | 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 |
| LM4865MMX | 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 |
| LM4865MMX/NOPB | 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 |
| LM4865MX | 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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