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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)： | 13/16頁 |
| 文件大?。?/td> | 511K |
| 代理商： | LM4753T |
Typical Performance Characteristics (Continued)
Application Information
GENERAL FEATURES
The LM4753 has a number of valuable functions that make
this audio amplifier IC an all-in-one solution. The IC has a
stereo audio path from input to output with a DC voltage con-
trolled volume attenuator in the preamp section. After the
volume attenuator is a line-out connection for preamp-out
control. The attenuation curve versus DC voltage can be
found by referring to the Volume Attenuation vs DC Voltage
graph in the Typical Performance Characteristics section.
The IC also possesses a mute function to provide audio at-
tenuation as used on a remote control for a TV, as well as a
standby function for power conservation when not being
used. The IC is well protected with thermal shutdown and
output AC short circuit protection.
Mute Function
The muting function of the LM4753 allows the user to mute
the music going into the amplifier, providing over 60 dB of at-
tenuation from input to output. The function is enabled by
placing a logic “1” or 5V onto the mute pin, pin 10. To disable
the function, allowing music to be passed to the output, a
logic “0” or 0V should be placed on the mute pin. By placing
the device into mute mode, each of the power amplifier out-
puts are simultaneously muted. The DC volume control and
line-out amplifiers are not affected by the mute function.
Please refer to
Table 1 for each input condition.
To prevent mechanical switch bouncing from adversely af-
fecting the functionality of the IC, an RC lowpass filter should
be used as shown in
Figure 2. This circuit replaces the need
for a debounce circuit when using a mechanical switch to
control the IC logic functions. However, most systems typi-
cally utilize a microprocessor or COP microcontroller to inter-
face with the logic control functions of the LM4753. When a
clean logic signal is used, as from a microcontroller, the RC
lowpass filter is not required.
Standby Function
The standby function allows the user to place the LM4753
into a power conserving mode that draws less than 10 mA of
quiescent power supply current. With the IC in this mode,
while using +22V for the supply voltage, the IC draws about
150 mW of power.
The standby function is enabled by placing a logic “1” or 5V
onto the standby pin, pin 9. To disable the function allowing
music to be passed to the output, a logic “0” or 0V should be
placed on the standby pin. When the standby function is en-
Supply Current
vs Supply Voltage
DS100043-20
Power Dissipation vs
Output Power
DS100043-21
Power Dissipation vs
Output Power
DS100043-22
Channel Separation
vs Frequency
DS100043-23
Attenuation vs Frequency
DS100043-24
Volume Attenuation vs
DC Voltage
DS100043-25
DS100043-26
FIGURE 2. Mute and Standby Pin Lowpass Filters
www.national.com
6
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| LM4766MDC | 40 W, 2 CHANNEL, AUDIO AMPLIFIER, UUC |
| LM4766MWC | 40 W, 2 CHANNEL, AUDIO AMPLIFIER, UUC |
| LM4801MH/NOPB | 1.5 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO28 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM4755 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Stereo 11W Audio Power Amplifier with Mute |
| LM4755_02 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Stereo 11W Audio Power Amplifier with Mute |
| 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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