參數(shù)資料
型號(hào)： LM3876DWF
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 音頻／視頻放大
英文描述： 56 W, 1 CHANNEL, AUDIO AMPLIFIER, UUC
封裝： WAFER
文件頁(yè)數(shù)： 3/22頁(yè)
文件大小： 626K
代理商： LM3876DWF
Typical Performance Characteristics (Continued)
Application Information
GENERAL FEATURES
Mute Function: The muting function of the LM3876 allows
the user to mute the music going into the amplifier by draw-
ing less than 0.5 mA out of pin 8 of the device. This is accom-
plished as shown in the Typical Application Circuit where the
resistor R
M is chosen with reference to your negative supply
voltage and is used in conjuction with a switch. The switch
(when opened) cuts off the current flow from pin 8 to V
, thus
placing the LM3876 into mute mode. Refer to the Mute At-
tenuation vs Mute Current curves in the Typical Perfor-
mance Characteristics section for values of attenuation per
current out of pin 8. The resistance R
M is calculated by the
following equation:
R
M (|VEE| 2.6V)/I8 where I8 ≥ 0.5 mA.
Under-Voltage Protection: Upon system power-up the
under-voltage protection circuitry allows the power supplies
and their corresponding caps to come up close to their full
values before turning on the LM3876 such that no DC output
spikes occur. Upon turn-off, the output of the LM3876 is
brought to ground before the power supplies such that no
transients occur at power-down.
Over-Voltage Protection: The LM3876 contains overvolt-
age protection circuitry that limits the output current to ap-
proximately 6Apeak while also providing voltage clamping,
though not through internal clamping diodes. The clamping
effect is quite the same, however, the output transistors are
designed to work alternately by sinking large current spikes.
SPiKe Protection: The LM3876 is protected from instanta-
neous peak-temperature stressing by the power transistor
array. The Safe Operating Area graph in the Typical Perfor-
mance Characteristics section shows the area of device
operation where the SPiKe Protection Circuitry is not en-
abled. The waveform to the right of the SOA graph exempli-
fies how the dynamic protection will cause waveform distor-
tion when enabled.
Thermal Protection: The LM3876 has a sophisticated ther-
mal protection scheme to prevent long-term thermal stress
to the device. When the temperature on the die reaches
165C, the LM3876 shuts down. It starts operating again
when the die temperature drops to about 155C, but if the
temperature again begins to rise, shutdown will occur again
at 165C. Therefore the device is allowed to heat up to a
relatively high temperature if the fault condition is temporary,
but a sustained fault will cause the device to cycle in a
Schmitt Trigger fashion between the thermal shutdown tem-
perature limits of 165C and 155C. This greatly reduces the
stress imposed on the IC by thermal cycling, which in turn
improves its reliability under sustained fault conditions.
Since the die temperature is directly dependent upon the
heat sink, the heat sink should be chosen as discussed in
the Thermal Considerations section, such that thermal
shutdown will not be reached during normal operation. Using
the best heat sink possible within the cost and space con-
straints of the system will improve the long-term reliability of
any power semiconductor device.
Mute Attenuation vs
Mute Current
DS011832-44
Mute Attenuation vs
Mute Current
DS011832-45
Large Signal Response
DS011832-46
Power Supply
Rejection Ratio
DS011832-47
Common-Mode
Rejection Ratio
DS011832-48
Open Loop
Frequency Response
DS011832-49
www.national.com
11
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM3876T 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
LM3876T 制造商:National Semiconductor Corporation 功能描述:56W W/Mute, 1 Channel Lm3876T IC Audio Amp
LM3876T/NOPB 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
LM3876TF 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
LM3876TF NOPB 制造商:Texas Instruments 功能描述:8MHz Class-AB Bulk
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