TDA1564 datasheet(21/30 Pages) PHILIPS

21 / 30 page

2004 Jan 27

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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