TDA1561 datasheet(7/24 Pages) PHILIPS

7 / 24 page

1997 Aug 14

Philips Semiconductors

Preliminary speciﬁcation

× 23 W high efﬁciency car radio power

ampliﬁer

TDA1561Q

Heatsink design

There are two parameters that determine the size of the

heatsink. The first is the rating for the virtual junction

temperature and the second is the ambient temperature at

which the amplifier must still deliver its full power in the

BTL mode.

With a conventional BTL ampliﬁer, the maximum power

dissipation with a music-like signal (at each ampliﬁer) will

be approximately two times 5 W. At a virtual junction

temperature of 150

°C and a maximum ambient

temperature of 60

°C, R

th(vj-c) = 1.3 K/W and

Rth(c-h) = 0.2 K/W, the thermal resistance of the heatsink

should be:

Compared to a conventional BTL ampliﬁer, the TDA1561Q

has a higher efﬁciency. The thermal resistance of the

heatsink should be:

150

–

----------------------

1.3

–

0.2

–

7.5 K/W

1.7

150

–

----------------------





1.3

–

0.2

–

13.8 K/W

Fig.3 Thermal equivalent resistance network.

handbook, halfpage

3.6 K/W

0.6 K/W

3.6 K/W

virtual junction

OUT 1

case

3.6 K/W

0.6 K/W

3.6 K/W

OUT 2

MGC424

0.1 K/W

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