1996 May 14

6

Philips Semiconductors

Product specification

40 W car radio high power amplifier

TDA1560Q

LIMITING VALUES

In accordance with the Absolute Maximum Rating System (IEC 134).

THERMAL CHARACTERISTICS

SYMBOL

PARAMETER

CONDITIONS

MIN.

MAX.

UNIT

supply voltage

operating

−

18

V

non-operating

−

30

V

45

V

non-repetitive peak output current

−

6A

repetitive peak output current

−

4A

AC and DC short-circuit safe voltage

−

18

V

−

200

mJ

current at pin 17

−

5mA

total power dissipation

−

60

W

storage temperature

−55

+150

°C

operating ambient temperature

−40

−°C

SYMBOL

PARAMETER

VALUE

UNIT

thermal resistance from junction to ambient in free air

40

K/W

thermal resistance from junction to case (measured in Fig.6)

3

K/W

Heatsink design

There are two parameters that determine the size of the

heatsink. The first is the rating for the case temperature

and the second is the ambient temperature at which the

amplifier must still deliver its full power in the class-H

mode.

With an 8

Ω load and driven with a music signal, the

maximum power dissipation is approximately 6.5 W. If the

amplifier is to deliver its full power at ambient temperatures

up to 50

°C the case temperature should not be higher

than120

°C for class-H operation.

In this example and with an 8

Ω load, the size of the

heatsink is determined by the rating for the maximum full

power ambient temperature. If the case temperature of the

device exceeds 120

°C then the device switches back to

class-B, see “Example 2”.

120

50

–

6.5

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

1.0

–

10 K/W

=

With disabled class-H mode, an 8

Ω load and driven with

a sine wave signal the maximum power dissipation is

approximately 5 W. At a virtual junction temperature of

150

°C and T

should be:

In this example the size of the heatsink is determined by

the virtual junction temperature.

150

60

–

5

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

3

1

14 K/W

=

–

–