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參數(shù)資料
| 型號： | FAN7005M |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | TV 100C 100#22D SKT RECP |
| 中文描述： | 0.3 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| 封裝： | SOP-8 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 495K |
| 代理商： | FAN7005M |
FAN7005
11
Application Informations
Power Supply Bypassing
Selection of proper power supply bypassing is critical to obtaining lower noise as well as higher power supply rejection.
Capacitors of the largest possible size may help to increase immunity to supply noise. However, taking into account
economical design, attaching 10
μ
F electrolytic capacitor or tantalum capacitor with 0.1
μ
F ceramic capacitor as closely as
possible to the VDD pin is sufficient to obtain a good supply noise rejection.
Single Ended Mode of Operation
The FAN7005 offers SE(Single Ended) operation. SE mode is adequate for head-phone load. The output power of SE mode is
expressed as follows :
To use the amplifier in SE mode, the output DC voltage must be blocked not to increase power consumption. Thus, the load is
tied to the output via the output DC blocking capacitor. Capacitor size can be chosen using above f
-3dB
equation. For example,
assuming the load impedance is 32
, a 248.8
μ
F capacitor guarantees 20Hz signal transmission to the load without gain
reduction. Refer to the Typical Performance Characteristics curves.
Shutdown Function
In order to reduce power consumption while not in use, the FAN7005 contains a shutdown pin(pin#3 @8MSOP) to turn off the
amplifier’s bias circuitry externally. This shutdown feature turns the amplifier off when a logic high is placed on the
shutdown pin. The trigger point between a logic low and logic high level is typically half the supply voltage. It is best to switch
between ground and supply to provide maximum device performance. By switching the shutdown pin to the VDD, the
FAN7005’s supply current draw will be minimized in idle mode. While the device will be disabled with shutdown pin voltages
less than VDD, the idle current may be greater than the typical value of 0.1
μ
A. In either case, the shutdown pin should be tied
to a defined voltage because leaving the shutdown pin floating may result in an unwanted shutdown. In many applications, a
micro controller or microprocessor output is used to control the shutdown circuitry, providing a quick, smooth transition into
shutdown. Another solution is to use a single pole, single throw switch in conjunction with an external pull up resistor.
When the switch is closed, the shutdown pin is connected to ground and enables the amplifier. If the switch is open, then the
external pull up resistor will disable the FAN7005. This scheme guarantees that the shutdown pin will not float, which will
prevent unwanted state changes.
Adaptive Q-Current Control Circuit
Among the different several kinds of analog amplifier, a class-AB satisfies moderate total harmonic distortion(THD) and
power efficiency. In general, distortion proportionally reduces to the quiescent current(Q-current) of the output stage, but
power efficiency is inversely proportional to it. To satisfy both needs, an adaptive Q-current control(AQC) technique is
proposed. The AQC circuit increases the Q-current with respect to the amount of output distortion, whereas it is not activated
when no input signal is applied and no output distortion is sensed.
Power Dissipation
Power dissipation is a major concern when using any power amplifier and must be thoroughly understood to ensure a success-
ful design. Equation 2 states the maximum power dissipation point for a single-ended amplifier operating at a given supply
voltage and driving a specified output load.
(2)
Since the FAN7005 has two operational amplifiers in one package, the maximum internal power dissipation point is twice that
of the number which results from equation(2). Even with a large internal power dissipation, the FAN7005 does not require a
heatsink over a large range of ambient temperature. From equation(2), assuming a 5V power supply and an 8
load, the max-
imum power dissipation point is 158.8mW per amplifier. Thus the maximum package dissipation point is 316.6mW. The max-
imum power dissipation point obtained must not be greater than the power dissipation that results from equation(3) :
PSE
V
2
---------------
=
(1)
PDMAX
2
2
RL
--------------------------
=
相關PDF資料 |
PDF描述 |
|---|---|
| FAN7005MU | 200mW Stereo Power Amplifier with Shutdown |
| FAN7005MUX | 200mW Stereo Power Amplifier with Shutdown |
| FAN7005MX | 200mW Stereo Power Amplifier with Shutdown |
| FAN7021 | CMOS Power Amplifier |
| FAN7021M | AUDIO AMPLIFIER|SINGLE|CMOS|SOP|8PIN|PLASTIC |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| FAN7005MU | 功能描述:音頻放大器 200mW Power amp Stereo 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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| FAN7005MUX | 功能描述:音頻放大器 200mW Power amp Stereo 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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| FAN7005MX | 功能描述:音頻放大器 200mW Power amp Stereo 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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| FAN7021 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:CMOS Power Amplifier |
| FAN7021M | 功能描述:音頻放大器 1W CMOS Power amp 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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
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