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參數(shù)資料
型號: LM4855ITL/NOPB
廠商: National Semiconductor
文件頁數(shù): 13/27頁
文件大?。?/td> 0K
描述: IC AMP AUDIO PWR 1.5W AB 18USMD
標準包裝: 1
系列: Boomer®
類型: AB 類
輸出類型: 1-通道(單聲道),帶立體聲耳機
在某負載時最大輸出功率 x 通道數(shù)量: 1.5W x 1 @ 4 歐姆; 115mW x 2 @ 32 歐姆
電源電壓: 2.6 V ~ 5 V
特點: 消除爆音,靜音,關(guān)機,SPI,熱保護,音量控制
安裝類型: 表面貼裝
供應(yīng)商設(shè)備封裝: 18-uSMD
封裝/外殼: 18-WFBGA
包裝: 標準包裝
其它名稱: LM4855ITLDKR
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:音頻放大器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
LM4855LQ 功能描述:音頻放大器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
LM4855LQ/NOPB 功能描述:音頻放大器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
LM4855LQBD 功能描述:BOARD EVALUATION LM4855LQ RoHS:否 類別:編程器,開發(fā)系統(tǒng) >> 評估板 - 音頻放大器 系列:Boomer® 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:1 系列:-