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TDA1564TH 데이터시트(PDF) 21 Page - NXP Semiconductors

부품명 TDA1564TH
상세설명  High efficiency 2 X 25 W/4 stereo car radio power amplifier
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제조업체  PHILIPS [NXP Semiconductors]
홈페이지  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

TDA1564TH 데이터시트(HTML) 21 Page - NXP Semiconductors

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2004 Jan 27
21
Philips Semiconductors
Preliminary specification
High efficiency 2
× 25 W/4 Ω
stereo car radio power amplifier
TDA1564
APPLICATION NOTES
Advantages of high efficiency
1. Power conversion improvement (power supply):
Usually, the fact that the reduction of dissipation is
directly related to supply current reduction, is
neglected. One advantage is less voltage drop in the
whole supply chain. Another advantage is less stress
for the coil in the supply line. Even the adapter or
supply circuit remains cooler than before due to the
reduced heat dissipation in the whole chain because
more supply current will be converted into output
power.
2. Power dissipation reduction: This is the best known
advantage of high efficiency amplifiers.
3. Heatsink size reduction: The heatsink size of a
conventional amplifier may be reduced with
approximately 50 % at Vp = 14.4 V when the TDA1564
will be used. In that case, the maximum heatsink
temperature will remain the same.
4. Heatsink temperature reduction: The power
dissipation and the thermal resistance of the heatsink
determine the heatsink temperature rise.
When the same heatsink size is used from a conventional
amplifier, the maximum heatsink temperature decreases
and also the maximum junction temperature, which
extends the life of this semiconductor device. The
maximum dissipation with music-like input signals
decreases by 40 %.
It is clear that the use of the TDA1564 saves a significant
amount of energy. The maximum supply current
decreases by approximately 32 %, that reduces the
dissipation in the amplifier as well as in the whole supply
chain. The TDA1564 allows a heatsink size reduction of
approximately 50 % or the heatsink temperature
decreases by 40 % when the heatsink size hasn’t been
changed.
Advantage of the concept used by TDA1564
The TDA1564 is highly efficient under all conditions,
because it uses a single-ended capacitor to create a
non-dissipating half supply voltage. Other concepts rely on
the fact that both input signals are the same in amplitude
and phase. With the concept of a SE capacitor it means
that it doesn’t matter what kind of signal processing is done
on the input signals. For example, amplitude difference,
phase shift or delays between both input signals, or other
DSP processing, have no impact on the efficiency.
handbook, halfpage
MGS824
Supply
current
reduction of
32%
Heatsink
size
reduction of
50%
Same heatsink
size
Same junction
temperature
Heatsink
temperature
reduction of
40%
Power
dissipation
reduction of 40%
at Po = 1.6 W
VP = 14.4 V
choice
Fig.25 Heatsink design.


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