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TDA2004R

14/17

Doc ID 17614 Rev 1

3.1.7

Thermal shut-down

The presence of a thermal limiting circuit offers the following advantages:

1.

an overload on the output (even if it is permanent), or an excessive ambient

temperature can be easily withstood.

2.

the heatsink can have a smaller factor of safety compared with that of a conventional

circuit. There is no device damage in the case of excessive junction temperature: all

The maximum allowable power dissipation depends upon the size of the external heatsink

(i.e. its thermal resistance); Figure 18 shows the power dissipation as a function of ambient

temperature for different thermal resistance.