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参数资料
| 型号： | LM4753T |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 11.8 W, 2 CHANNEL, AUDIO AMPLIFIER, PZFM15 |
| 封装： | TO-220, 15 PIN |
| 文件页数： | 2/16页 |
| 文件大小： | 511K |
| 代理商： | LM4753T |
Application Information (Continued)
Line Out
The line out function for the LM4753 is intended to provide
preamp output control for signal routing to an external power
amplifier. An example of this would be in a TV where the TV’s
remote control provides volume control on the audio signals
that may be sent to a home theater receiver. The line out am-
plifier is only able to drive high impedance loads like 2 k
and 10 k
. Since the LM4753 utilizes a single +22V power
supply, the output of the line out amplifier is biased at 12 of
V
CC or +11V. Because of this, its output should be capacitor
coupled to any other processing IC. The value of the capaci-
tor is chosen by using
Equation (1).
f = 1/2
πRC
(1)
where R is the processing IC input impedance and f is the
lowest audio frequency to be passed, like 20 Hz. The value
of capacitance is then calculated. For a 10 k
impedance,
C = 1F.
AC Short Circuit Protection
The LM4753 is AC short circuit protected with a current lim-
iting setting minimum of 2.0A. Current limiting protection
works on AC waveforms only. DC shorts from the output to
ground are not protected. Generally this is not a concern as
there is a DC blocking capacitor on the output to protect the
speaker from single-supply DC bias.
Thermal Shutdown Protection
The LM4753 has a thermal shutdown protection scheme that
limits the drive capability of each amplifier output when the
internal die temperature reaches the temperature trip point
of 150C. The limiting of the output current drive capability is
proportional to increasing die temperature.
When the IC is in thermal shutdown mode, all of the DC bi-
ases of the IC remain unchanged. It is only the current drive
capability of the output power transistors that is limited. This
thermal shutdown mechanism provides for smooth audio at-
tenuation rather than abruptly pulling the outputs to ground.
When the outputs are being limited, the maximum voltage
swing will be reduced, creating a clipping effect as shown in
Figure 7. With further increases in die temperature the maxi-
mum voltage swing will be further reduced.
The thermal sensing mechanism monitors the global die
temperature and is not intended to operate quickly enough to
shutdown the IC for extremely high power dissipation pulses
created by driving very low impedance loads.
DS100043-30
FIGURE 6. Turn-On/Off External Circuitry Sequence
www.national.com
10
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相关代理商/技术参数 |
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| LM4755 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Stereo 11W Audio Power Amplifier with Mute |
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| LM4755T/NOPB | 功能描述:IC AMP AUDIO PWR 11W AB TO220-9 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) |
| LM4755T/NOPB | 制造商:Texas Instruments 功能描述:Audio Power Amplifier IC |
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