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TDA1564TH 데이터시트(PDF) 21 Page - NXP Semiconductors |
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TDA1564TH 데이터시트(HTML) 21 Page - NXP Semiconductors |
21 / 30 page 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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