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参数资料
| 型号： | LM4752MWC |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 7 W, 2 CHANNEL, AUDIO AMPLIFIER, UUC |
| 封装： | WAFER |
| 文件页数： | 2/21页 |
| 文件大小： | 732K |
| 代理商： | LM4752MWC |
Typical Performance Characteristics (Continued)
Application Information
CAPACITOR SELECTION AND FREQUENCY
RESPONSE
With the LM4752, as in all single supply amplifiers, AC cou-
pling capacitors are used to isolate the DC voltage present at
the inputs (pins 2,6) and outputs (pins 1,7). As mentioned
earlier in the External Components section these capaci-
tors create high-pass filters with their corresponding input/
output impedances. The Typical Application Circuit shown
in
Figure 1 shows input and output capacitors of 0.1 F and
1,000 F respectively. At the input, with an 83 k
typical in-
put resistance, the result is a high pass 3 dB point occurring
at 19 Hz. There is another high pass filter at 39.8 Hz created
with the output load resistance of 4
. Careful selection of
these components is necessary to ensure that the desired
frequency response is obtained. The Frequency Response
curves in the Typical Performance Characteristics section
show how different output coupling capacitors affect the low
frequency rolloff.
APPLICATION CIRCUIT WITH MUTE
With the addition of a few external components, a simple
mute circuit can be implemented, such as the one shown in
Figure 3. This circuit works by externally pulling down the
half supply bias line (pin 5), effectively shutting down the in-
put stage.
When using an external circuit to pull down the bias, care
must be taken to ensure that this line is not pulled down too
quickly, or output “pops” or signal feedthrough may result. If
the bias line is pulled down too quickly, currents induced in
the internal bias resistors will cause a momentary DC volt-
age to appear across the inputs of each amplifier’s internal
differential pair, resulting in an output DC shift towards
V
SUPPLY. An R-C timing circuit should be used to limit the
pull-down
time
such
that
output
“pops”
and
signal
feedthroughs will be minimized. The pull-down timing is a
function of a number of factors, including the external mute
circuitry, the voltage used to activate the mute, the bias ca-
pacitor, the half-supply voltage, and internal resistances
used in the half-supply generator.
Table 1 shows a list of rec-
ommended values for the external mute circuitry.
TABLE 1. Values for Mute Circuit
V
MUTE
R1
R2
C1
R3
C
B
V
CC
5V
10 k
10 k 4.7 F 360 100 F 21V–32V
V
S
20 k
1.2 k 4.7 F 180 100 F 15V–32V
V
S
20 k
910 4.7 F 180 47 F 22V–32V
OPERATING IN BRIDGE-MODE
Though designed for use as a single-ended amplifier, the
LM4752 can be used to drive a load differentially (bridge-
mode). Due to the low pin count of the package, only the
non-inverting inputs are available. An inverted signal must
be provided to one of the inputs. This can easily be done with
the use of an inexpensive op-amp configured as a standard
inverting amplifier. An LF353 is a good low-cost choice. Care
must be taken, however, for a bridge-mode amplifier must
theoretically dissipate four times the power of a single-ended
type. The load seen by each amplifier is effectively half that
of the actual load being used, thus an amplifier designed to
drive a 4
load in single-ended mode should drive an 8
load when operating in bridge-mode.
Power Dissipation vs Output Power
DS100039-51
Power Dissipation vs Output Power
DS100039-52
LM4752
www.national.com
10
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM4752T | 制造商:National Semiconductor Corporation 功能描述: 制造商:Texas Instruments 功能描述: |
| LM4752T/NOPB | 功能描述:IC AMP AUDIO PWR 11W AB TO220-7 RoHS:是 类别:集成电路 (IC) >> 线性 - 音頻放大器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:DirectDrive® 类型:H 类 输出类型:耳机，2-通道（立体声） 在某负载时最大输出功率 x 通道数量:35mW x 2 @ 16 欧姆 电源电压:1.62 V ~ 1.98 V 特点:I²C，麦克风，静音，短路保护，音量控制 安装类型:表面贴装 供应商设备封装:25-WLP（2.09x2.09） 封装/外壳:25-WFBGA，WLCSP 包装:带卷 (TR) |
| LM4752T/NOPB | 制造商:Texas Instruments 功能描述:Audio Power Amplifier IC |
| LM4752TS | 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 |
| LM4752TS/NOPB | 功能描述:音频放大器 STEREO 11W AUDIO PWR AMP 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 |
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