TDA7374B Datasheet, PDF (9/13 Pages) STMicroelectronics – DUAL BRIDGE AUDIO AMPLIFIER FOR CAR RADIO

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.
TDA7374B
Figure 17: Maximum Allowable Power
Dissipation vs. Ambient Temperature
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 V_S short
circuit occurs both the outputs are switched OFF
so limiting dangerous DC current flowing through
the loudspeaker.
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