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參數(shù)資料
| 型號(hào)： | LM4855LQ/NOPB |
| 廠商： | National Semiconductor |
| 文件頁(yè)數(shù)： | 13/27頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP AUDIO PWR 1.5W MONO 24LLP |
| 標(biāo)準(zhǔn)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(jī) |
| 在某負(fù)載時(shí)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(diǎn)： | 消除爆音，靜音，關(guān)機(jī)，SPI，熱保護(hù)，音量控制 |
| 安裝類型： | 表面貼裝 |
| 供應(yīng)商設(shè)備封裝： | 24-LLP-EP（4x5） |
| 封裝/外殼： | 24-WFQFN 裸露焊盤 |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 配用： | LM4855LQBD-ND - BOARD EVALUATION LM4855LQ |
| 其它名稱： | LM4855LQDKR |
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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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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM4855LQX/NOPB | 制造商:Texas Instruments 功能描述:Audio Amp Headphone/Speaker 1-CH Mono/2-CH Stereo 1.5W Class-AB 24-Pin LLP EP T/R |
| LM4856 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Integrated Audio Amplifier System |
| LM48560 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:High Voltage Class H Ceramic Speaker Driver with Automatic Level Control |
| LM48560TL | 制造商:TI 制造商全稱:Texas Instruments 功能描述:High Voltage Class H Ceramic Speaker Driver with Automatic Level Control |
| LM48560TL/NOPB | 功能描述:音頻放大器 Hi Vltg Class H Cer Speaker Driver 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(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
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