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參數(shù)資料
| 型號(hào)： | LM4753T |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 11.8 W, 2 CHANNEL, AUDIO AMPLIFIER, PZFM15 |
| 封裝： | TO-220, 15 PIN |
| 文件頁數(shù)： | 2/16頁 |
| 文件大?。?/td> | 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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| LM4755 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Stereo 11W Audio Power Amplifier with Mute |
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| LM4755T | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Stereo 11W Audio Power Amplifier with Mute |
| LM4755T/NOPB | 功能描述:IC AMP AUDIO PWR 11W AB TO220-9 RoHS:是 類別:集成電路 (IC) >> 線性 - 音頻放大器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:DirectDrive® 類型:H 類 輸出類型:耳機(jī)，2-通道（立體聲） 在某負(fù)載時(shí)最大輸出功率 x 通道數(shù)量:35mW x 2 @ 16 歐姆 電源電壓:1.62 V ~ 1.98 V 特點(diǎn):I²C，麥克風(fēng)，靜音，短路保護(hù)，音量控制 安裝類型:表面貼裝 供應(yīng)商設(shè)備封裝:25-WLP（2.09x2.09） 封裝/外殼:25-WFBGA，WLCSP 包裝:帶卷 (TR) |
| LM4755T/NOPB | 制造商:Texas Instruments 功能描述:Audio Power Amplifier IC |
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