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參數資料
| 型號： | LM4951 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Wide Voltage Range 1.8 Watt Audio Amplifier |
| 中文描述： | 寬電壓范圍1.8瓦音頻功率放大器 |
| 文件頁數： | 1/18頁 |
| 文件大小： | 1119K |
| 代理商： | LM4951 |
LM4951
Wide Voltage Range 1.8 Watt Audio Amplifier
General Description
The LM4951 is an audio power amplifier primarily designed
for demanding applications in Portable Handheld devices. It
is capable of delivering 1.8W mono BTL to an 8
load,
continuous average power, with less than 1% distortion
(THD+N) from a 7.5V
DC
power supply.
Boomer audio power amplifiers were designed specifically to
provide high quality output power with a minimal amount of
external components. The LM4951 does not require boot-
strap capacitors, or snubber circuits.
The LM4951 features a low-power consumption active-low
shutdown mode. Additionally, the LM4951 features an inter-
nal thermal shutdown protection mechanism.
The LM4951 contains advanced pop & click circuitry that
eliminates noises which would otherwise occur during
turn-on and turn-off transitions.
The LM4951 is unity-gain stable and can be configured by
external gain-setting resistors.
Key Specifications
j
Wide Voltage Range
j
Quiescent Power Supply Current
(V
DD
= 7.5V)
j
Power Output BTL at 7.5V,
1% THD
j
Shutdown Current
j
Fast Turn on Time
2.7V to 9V
2.5mA (typ)
1.8W (typ)
0.01μA (typ)
25mS (typ)
Features
n
Pop & click circuitry eliminates noise during turn-on and
turn-off transitions
n
Low current, active-low shutdown mode
n
Low quiescent current
n
Thermal shutdown protection
n
Unity-gain stable
n
External gain configuration capability
Applications
n
Portable Handheld Devices up to 9V
n
Cell Phone
n
PDA
Typical Application
Boomer
is a registered trademark of National Semiconductor Corporation.
200942F4
* R
C
is needed for over/under voltage protection. If inputs are less than V
DD
+0.3V and greater than –0.3V, and if inputs are
disabled when in shutdown mode, then R
C
may be shorted.
FIGURE 1. Typical Bridge-Tied-Load (BTL) Audio Amplifier Application Circuit
November 2005
L
2005 National Semiconductor Corporation
DS200942
www.national.com
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LM4951A | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Wide Voltage Range 1.8 Watt Audio Amplifier With Short Circuit Protection |
| LM4951ASD | 功能描述:音頻放大器 RoHS:否 制造商:STMicroelectronics 產品: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 |
| LM4951ASD/NOPB | 功能描述:音頻放大器 RoHS:否 制造商:STMicroelectronics 產品: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 |
| LM4951ASDBD | 功能描述:BOARD EVALUATION FOR LM4951A RoHS:否 類別:編程器，開發系統 >> 評估板 - 音頻放大器 系列:Boomer® 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:1 系列:- |
| LM4951ASDBD/NOPB | 功能描述:音頻 IC 開發工具 LM4951ASD EVAL BOARD RoHS:否 制造商:Texas Instruments 產品:Evaluation Kits 類型:Audio Amplifiers 工具用于評估:TAS5614L 工作電源電壓:12 V to 38 V |
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