参数资料
型号: LM4855IBL/NOPB
厂商: National Semiconductor
文件页数: 13/27页
文件大小: 0K
描述: IC AMP AUDIO PWR 1.5W AB 18USMD
标准包装: 1
系列: Boomer®
类型: AB 类
输出类型: 1-通道(单声道),带立体声耳机
在某负载时最大输出功率 x 通道数量: 1.5W x 1 @ 4 欧姆; 115mW x 2 @ 32 欧姆
电源电压: 2.6 V ~ 5 V
特点: 消除爆音,静音,关机,SPI,热保护,音量控制
安装类型: 表面贴装
供应商设备封装: 18-uSMD
封装/外壳: 18-VFBGA
包装: 标准包装
其它名称: LM4855IBLDKR
SNAS164C – JUNE 2002 – REVISED MAY 2013
Bypass Capacitor Value Selection
Besides minimizing the input capacitor size, careful consideration should be paid to value of CB, the capacitor
connected to the BYPASS pin. Since CB determines how fast the LM4855 settles to quiescent operation, its
value is critical when minimizing turn-on pops. The slower the LM4855's outputs ramp to their quiescent DC
voltage (nominally VDD/2), the smaller the turn-on pop. Choosing CB equal to 1.0F along with a small value of Ci
(in the range of 0.1F to 0.39F), produces a click-less and pop-less shutdown function. As discussed above,
choosing Ci no larger than necessary for the desired bandwidth helps minimize clicks and pops. CB's value
should be in the range of 5 times to 7 times the value of Ci. This ensures that output transients are eliminated
when power is first applied or the LM4855 resumes operation after shutdown.
Demonstration Board Layout
Figure 38. Recommended YZR PC Board Layout:
Figure 39. Recommended YZR PC Board Layout:
Top Silkscreen
Top Layer
Figure 40. Recommended YZR PC Board Layout:
Figure 41. Recommended YZR PC Board Layout:
Middle Layer
Bottom Layer
20
Copyright 2002–2013, Texas Instruments Incorporated
Product Folder Links: LM4855
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LM4855ITLX 制造商:Texas Instruments 功能描述:Audio Amp Headphone/Speaker 1-CH Mono/2-CH Stereo 1.1W Class-AB 18-Pin uSMD T/R
LM4855ITLX/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
LM4855LQ 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