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PDF FAN7005 Data sheet ( Hoja de datos )
| Número de pieza | FAN7005 | |
| Descripción | 200mW Stereo Power Amplifier with Shutdown | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
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www.fairchildsemi.com
FAN7005
200mW Stereo Power Amplifier with Shutdown
Features
• 200mW and 300mW Power Per Each Channel into 8Ω
Load with Less Than 0.3% and 10% THD+N,
Respectively
• Low Shutdown Current : 0.1µA(Typ.)
• No Bootstrap Capacitors or Snubber Circuits are
Necessary
• Stable Unity-Gain
• Guaranteed Stability Under No Load Condition
• External Gain Configuration Capability
• Thermal Shutdown Protection Circuitry
• Pop Reduction Circuit
• 8MSOP Surface Mount Packaging
Typical Applications
• PDA
• MP3/CDP
• Portable Audio System
Description
The FAN7005 is a dual, fully differential audio power ampli-
fier delivering 200mW(typ.) of continuous power into an 8Ω
load. When driving 200mW into an 8Ω load from a 5V
power supply, the FAN7005 has less than 0.3% of THD+N
over the entire audible frequency range. To reduce the power
consumption in portable applications, the FAN7005 provides
a shutdown capability. In shutdown condition, current con-
sumption is reduced to less than 2µA. The FAN7005 is
designed specifically to provide high quality output power
with a minimal amount of external components using surface
mount packaging. Since the additional snubber circuits or
bootstrap capacitors are not needed, the FAN7005 is well
suited for portable systems and other hand-held devices.
8MSOP
1
8SOP
1
Internal Block Diagram
RIN 8
VDD
6
SDH 3
Bias 100kΩ
VDD/2
20kΩ
7 ROUT
BP 1
LIN 4
100kΩ
2
GND
20kΩ
5 LOUT
FAN7005MU(8MSOP)
©2002 Fairchild Semiconductor Corporation
RIN 2
VDD
8
SDH 5
100kΩ
Bias
VDD/2
20kΩ
BP 3
100kΩ
20kΩ
LIN 6
4
GND
FAN7005M(8SOP)
1 ROUT
7 LOUT
Rev. 1.0.0
1 page  
Typical Performance Characteristics
FAN7005
10
VDD=5V
RL=8Ω
Av=-1
BW < 80kHz
1
0.1
0.01
f = 20kHz
f = 1kHz
10
VDD=5V
RL=16Ω
Av=-1
BW < 80kHz
1
0.1
0.01
f = 20kHz
f = 1kHz
0.001
10m
0.1
Output Power (W)
Figure 1. THD+N vs. Output Power
0.001
0.5 10m
0.1
Output Power (W)
Figure 2. THD+N vs. Output Power
0.3
10
VDD=5V
RL=32Ω
Av=-1
BW < 80kHz
1
0.1
0.01
f = 20kHz
f = 1kHz
10
VDD=3V
RL=8Ω
Av=-1
BW < 80kHz
1
0.1
0.01
f = 20kHz
f = 1kHz
0.001
10m
50m
Output Power (W)
Figure 3. THD+N vs. Output Power
0.001
0.1 10m
Output Power (W)
0.1
Figure 4. THD+N vs. Output Power
0.2
10
VDD=3V
RL=16Ω
Av=-1
BW < 80kHz
1
0.1
f = 20kHz
0.01
f = 1kHz
0.001
10m
50m
Output Power (W)
Figure 5. THD+N vs. Output Power
10
VDD=3V
RL=32Ω
Av=-1
BW < 80kHz
1
0.1
0.01
f = 20kHz
f = 1kHz
0.001
10m
0.1
20m
30m
Output Power (W)
Figure 6. THD+N vs. Output Power
40m 50m
5
5 Page 
FAN7005
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 10µF electrolytic capacitor or tantalum capacitor with 0.1µF 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 :
PSE = 8---V--⋅---R-P2----L--
(1)
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 32Ω, a 248.8µF 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 0.1µA. 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.
PDMAX = 2-----⋅--V-π----D22----D-⋅---R----L--
(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 8Ω 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) :
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet FAN7005.PDF ] | |
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