参数资料
型号: LM4891MBD
厂商: National Semiconductor
文件页数: 7/21页
文件大小: 0K
描述: BOARD EVALUATION LM4891M
标准包装: 1
系列: Boomer®
放大器类型: AB 类
输出类型: 1-通道(单声道)
在某负载时最大输出功率 x 通道数量: 1W x 1 @ 8 欧姆
电源电压: 2.2 V ~ 5.5 V
工作温度: -40°C ~ 85°C
板类型: 完全填充
已用 IC / 零件: LM4891
已供物品:
相关产品: LM4891MX-ND - IC AMP AUDIO PWR 1W MONO 8SOIC
LM4891MMTR-ND - IC AMP AUDIO PWR 1W MONO 8MSOP
LM4891M-ND - IC AMP AUDIO PWR 1W MONO 8SOIC
OBSOLETE
SNAS122E – MAY 2001 – REVISED APRIL 2013
Figure 31. Higher Gain Audio Amplifier
The LM4891 is unity-gain stable and requires no external components besides gain-setting resistors, an input
coupling capacitor, and proper supply bypassing in the typical application. However, if a closed-loop differential
gain of greater than 10 is required, a feedback capacitor (C4) may be needed as shown in Figure 31 to
bandwidth limit the amplifier. This feedback capacitor creates a low pass filter that eliminates possible high
frequency oscillations. Care should be taken when calculating the -3dB frequency in that an incorrect
combination of R3 and C4 will cause rolloff before 20kHz. A typical combination of feedback resistor and
capacitor that will not produce audio band high frequency rolloff is R3 = 20k and C4 = 25pf. These components
result in a -3dB point of approximately 320 kHz.
Figure 32. Differential Amplifier Configuration for LM4891
Copyright 2001–2013, Texas Instruments Incorporated
15
Product Folder Links: LM4891
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