TDA1561Q/N2 查看數據表（PDF） - Philips Electronics

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TDA1561Q/N2

2×23 W high efficiency car radio power amplifier

Philips Electronics 

Philips Semiconductors

2 × 23 W high efficiency car radio power

amplifier

Preliminary specification

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, Rth(vj-c) = 1.3 K/W and

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

should be: 1----5-2--0---×--–---5--6---0-- – 1.3 – 0.2 = 7.5 K/W

Compared to a conventional BTL amplifier, the TDA1561Q

has a higher efficiency. The thermal resistance of the

heatsink should be:

1.7





1----5-2--0---×--–---5--6---0-- 

– 1.3 – 0.2

=

13.8

K/W

handbook, halfpage

OUT 1

virtual junction

OUT 1

OUT 2

OUT 2

3.6 K/W

3.6 K/W

3.6 K/W

3.6 K/W

0.6 K/W

0.6 K/W

0.1 K/W

MGC424

case

Fig.3 Thermal equivalent resistance network.

1997 Aug 14

7

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