TDA7374 datasheet(9/13 Pages) STMICROELECTRONICS

9 / 13 page

DC Voltage

The maximum operating DC voltage for the

TDA7374B is 18V.

However the device can withstand a DC voltage

up to 28V with no damage. This could occur dur-

ing winter if two batteries are series connected to

crank the engine.

Thermal Shut-down

The presence of a thermal limiting circuit offers

the following advantages:

1)an overload on the output (even if it is perma-

nent), 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 case of

excessive junction temperature: all happens

is that Po (and therefore Ptot) and Id are re-

duced.

The maximum allowable power dissipation de-

pends upon the size of the external heatsink (i.e.

its thermal resistance); Fig. 17 shows the dissi-

pable power as a function of ambient temperature

for different thermal resistance.

Loudspeaker Protection

The TDA7374B guarantees safe operations even

for the loudspeaker in case of accidental shortcir-

cuit.

Whenever a single OUT to GND, OUT to VS short

circuit occurs both the outputs are switched OFF

so limiting dangerous DC current flowing through

the loudspeaker.

Figure 17: Maximum Allowable Power

Dissipation vs. Ambient Temperature

TDA7374B

9/13

TDA7374 Datasheet(PDF) 9 Page - STMicroelectronics