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PDF SA7347 Data sheet ( Hoja de datos )
| Número de pieza | SA7347 | |
| Descripción | 4CH AUDIO POWER AMPLIFIER | |
| Fabricantes | Silan Microelectronics | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SA7347 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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SA7347
4-CH AUDIO POWER AMPLIFIER(8W X4)
DESCRIPTION
SA7347 is a four channel audio amplifier including two non
inverted amplifiers and two inverted amplifiers, so it can be
conveniently applied in Bridge-Tied Load (BTL) mode.
Built-in protection circuit based on multiple temperature
measurements inside SA7347 makes it possible for all supply
voltages and load conditions to export maximum power.
FEATURES
* Soft clip
* Standby and mute mode
* No on/off switching plops
* High supply voltage ripple rejection
* Thermally protected
* Outputs short circuit protected to ground, supply and across
the load
APPLICATIONS
* Television, PC speakers and mini stereo system, etc
HSIP-15
ORDERING INFORMATION
Device
SA7347
Package
HSIP-15
BLOCK DIAGRAM
www.DataSheet4U.com
HANGZHOU MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:1.1 2007.07.27
Page 1 of 9
1 page  
SA7347
protection circuit will start to switch off the bias of channel when local temperature reaches approximately 185°C
or global temperature reaches approximately 150°C. As a result, there is low dissipating in the chip. It starts
operating again when the chip temperature drop to same value below the die temperature. But if the temperature
again begins to rise, the SA7347 shuts down again. The process will not stop until the local temperature is under
185°C and the global temperature is under 150°C.
This protects the SA7347 against shorts to ground, to the supply voltage and across the load, and against too
high chip temperatures. However, not that there are abnormal events as shorts to ground, to the supply voltage
and across the load in the chip, the protection circuit should start-up. In fact, just as much as the temperature
does not exceed the critical level, the protection circuit will not operate.
Power Dissipation and Heat Sinking
Proper heat sinking is necessary to ensure that SA7347 will function correctly under all operating conditions. A
heat sink that is too small will cause the die to heat excessively and will result in a degraded output signal as the
thermal protection circuitry begins to operate.
In order to determine the appropriate heat sink for a given application, the power dissipation of the SA7347 in
that application must be known. When the load is resistive, the maximum average power that the IC will be
required to dissipate is approximately:
PD(MAX)=4*VS2/(2π2RL)+PQ
Where VS is the total power supply voltage across the SA7347, RL is the load resistance; PQ is the quiescent
power dissipation of the amplifier. The above equation is only an approximation which assumes an “ideal”class B
output stage and constant power dissipation in all other parts of the circuit. As an example, if the SA7347 is
operated on a 15V power supply with a resistive load of 4Ω, it can develop up to 13.5W of internal power
dissipation. If the die temperature is to remain below 150°C for ambient temperatures up to 60°C, the total
junction-to-ambient thermal resistance must be less than:
(150°C 60°C)/13.5W 6.7°C /W
Using Rth(j-c) = 1.3°C /W, the sum of the case-to-heat-sink interface thermal resistance and the heat-sink-to-
www.DataShaemetb4iUen.ctotmhermal resistance must be less than 5.4°C/W. The case-to-heat-sink thermal resistance of the HSIP-15
package varies with the mounting method used. A metal-to-metal interface will be about 1°C /W if lubricated, and
about 1.5°C /W if dry.
6.7°C /W-1.3°C /W-1°C /W 4.4°C /W
The thermal requirements can become more difficult when an amplifier is driving a reactive load. For a given
magnitude of load impedance, a higher degree of reactance will cause a higher level of power dissipation within
the amplifier. As a general rule, the power dissipation of an amplifier driving a 60º reactive load (usually
considered to be a worst-case loudspeaker load) will be roughly that of the same amplifier driving the resistive
part of that load. For example, a loudspeaker may at some frequency have an impedance with a magnitude of 8Ω
and a phase angle of 60º. The real part of this load will then be 4Ω, and the amplifier power dissipation will
roughly follow the curve of power dissipation with a 4Ω load.
HANGZHOU MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:1.1 2007.07.27
Page 5 of 9
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet SA7347.PDF ] | |
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