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參數(shù)資料
| 型號(hào)： | LM4870 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 1.1W Audio Power Amplifier with Shutdown Mode |
| 中文描述： | 1.1W音頻功率放大器關(guān)斷模式 |
| 文件頁(yè)數(shù)： | 4/8頁(yè) |
| 文件大小： | 259K |
| 代理商： | LM4870 |
Typical Performance Characteristics
(Continued)
Application Information
BRIDGE CONFIGURATION EXPLANATION
As shown in Figure 1 the LM4870 has two operational am-
plifiers internally, allowing for a few different amplifier con-
figurations. The first amplifier’s gain is externally config-
urable, while the second amplifier is internally fixed in a
unity-gain, inverting configuration. The closed-loop gain of
the first amplifier is set by selecting the ratio of R
to R
while
the second amplifier’s gain is fixed by the two internal 40 k
resistors. Figure 1 shows that the output of amplifier one
serves as the input to amplifier two which results in both am-
plifiers producing signals identical in magnitude, but out of
phase 180. Consequently, the differential gain for the IC is:
A
vd
= 2
*
(R
f
/R
i
)
By driving the load differentially through outputs V
and
V
, an amplifier configuration commonly referred to as
“bridged mode” is established. Bridged mode operation is
different from the classical single-ended amplifier configura-
tion where one side of its load is connected to ground.
A bridge amplifier design has a few distinct advantages over
the single-ended configuration, as it provides differential
drive to the load, thus doubling output swing for a specified
supply voltage. Consequently, four times the output power is
possible as compared to a single-ended amplifier under the
same conditions. This increase in attainable output power
assumes that the amplifier is not current limited or clipped. In
order to choose an amplifier’s closed-loop gain without caus-
Supply Current Distribution
vs Temperature
DS100094-19
Power Dissipation
vs Output Power
DS100094-20
Output Power vs
Load Resistance
DS100094-21
Output Power vs
Supply Voltage
DS100094-22
Output Power vs
Supply Voltage
DS100094-27
Open Loop
Frequency Response
DS100094-23
Power Supply
Rejection Ratio
DS100094-24
www.national.com
4
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM4870M | 1.1W Audio Power Amplifier with Shutdown Mode |
| LM4871 | 1.1W Audio Power Amplifier with Shutdown Mode |
| LM4871N | 1.1W Audio Power Amplifier with Shutdown Mode |
| LM4871MX | 1.1W Audio Power Amplifier with Shutdown Mode |
| LM4871M | 1.1W Audio Power Amplifier with Shutdown Mode |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM4870M | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| LM4870MX | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| LM4871 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:3W Audio Power Amplifier with Shutdown Mode |
| LM4871_03 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:3W Audio Power Amplifier with Shutdown Mode |
| LM4871LD | 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(lèi)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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