參數(shù)資料
型號(hào)： FAN7005MU
廠商： FAIRCHILD SEMICONDUCTOR CORP
元件分類： 音頻／視頻放大
英文描述： 200mW Stereo Power Amplifier with Shutdown
中文描述： 0.3 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO8
封裝： MSOP-8
文件頁(yè)數(shù)： 12/16頁(yè)
文件大?。?/td> 495K
代理商： FAN7005MU
FAN7005
12
For package 8MSOP(FAN7005MU), Rthja=210°C/W, T
JMAX
=150°C for the FAN7005.
Depending on the ambient temperature, T
A
, of the system environment, equation(3) can be used to find the maximum internal
power dissipation supported by the IC packaging. If the result of equation(2) is greater than that of equation(3), then either the
supply voltage must be decreased, the load impedance increased or the T
A
reduced. For the typical application of a 5V power
supply, with an 8
load, the maximum ambient temperature possible without violating the maximum junction temperature is
approximately 83.5°C provided that device operation is around the maximum power dissipation point. Power dissipation is a
function of output power and thus, if typical operation is not around the maximum power dissipation point, the ambient
temperature may be increased accordingly. Refer to the
Typical Performance Characteristics
curves for power dissipation
information for lower output powers.
Proper Selection of External Components
Selection of external components when an using integrated power amplifier is critical for optimizing device and system
performance. While the FAN7005 is tolerant of external component combinations, consideration must be given to component
values to maximize overall system quality. The FAN7005 has a stable unity gain and this gives a designer maximum system
flexibility. The FAN7005 should be used in low gain configurations to minimize THD+N values and maximize the signal to
noise ratio. Low gain configurations require large input signals to obtain a given output power. Input signals equal to or greater
than 1Vrms are available from sources such as audio codecs. Besides gain, one of the major considerations is the closed loop
bandwidth of the amplifier. To a large extent, the bandwidth is dictated by the choice of external components shown in the
Typical Application Circuit
. Both the input coupling capacitor, C
I
, and the output coupling capacitor, C
O
, form first order
high pass filters which limit low frequency response. These values should be chosen based on required frequency response for
a few distinct responses.
Selection of Input and Output Capacitor Size
Large input and output capacitors are both expensive and space hungry for portable designs. Clearly a certain sized capacitor is
needed to couple in low frequencies without severe attenuation. But in many cases the speakers used in portable systems,
whether internal or external, have little ability to reproduce signals below 150Hz. Thus using large input and output capacitors
may not increase system performance. In addition to system cost and size, click and pop performance is affected by the size of
the input coupling capacitor, C
I
. A larger input coupling capacitor requires more charge to reach its quiescent DC voltage
(normally VDD/2). This charge comes from the output via the feedback and is apt to create pops upon device enable. Thus, by
minimizing the capacitor size based on the necessary low frequency response, turn on pops can be minimized. Besides
minimizing the input and output capacitor sizes, careful consideration should be paid to the bypass capacitor value. Bypass
capacitor
,
C
B
is the most critical component for minimizing turn on pops since it determines how fast the FAN7005 turns on.
The slower the FAN7005’s outputs ramp to their quiescent DC voltage(normally VDD/2), the smaller the turn on pop. Thus
choosing C
B
equal to 1.0
μ
F along with a small value of C
I
(in the range of 0.1
μ
F to 0.39
μ
F), the shutdown function should be
virtually click less and peoples. While the device will function properly, (no oscillations or motor boating), with C
B
equal to
0.1
μ
F, the device will be much more susceptible to turn on clicks and pops. Thus, a value of C
B
equal to 0.1
μ
F or larger is
recommended in all but the most sensitive designs.
Using Low-ESR Capacitors, Co
Low-ESR capacitors are recommended throughout this applications section. A real(as opposed to ideal) capacitor can be
modeled simply as a resistor in series with an ideal capacitor. The voltage drop across this resistor minimizes the beneficial
effects of the capacitor in the circuit. The lower the equivalent value of this resistance the more the real capacitor behaves like
an ideal capacitor.
PDMAX
Rthja
---------------------–
=
(3)
相關(guān)PDF資料
PDF描述
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
FAN7023M 1W CMOS Mono Power Amplifier
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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(fēng)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(fēng)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(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
FAN7021M_Q 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(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
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