Polarity Inversion

High current (up to 10A) can be handled by the

device with no damage for a longer period than

the blow-out time of a quick 2A fuse (normally

connected in series with the supply). This fea-

tures is added to avoid destruction, if during fitting

to the car, a mistake on the connection of the

supply is made.

Open Ground

When the radio is in the ON condition and the

ground is accidentally opened, a standard audio

amplifier will be damaged. On the TDA7370 pro-

tection diodes are included to avoid any damage.

Inductive Load

A protection diode is provided to allow use of the

TDA7370 with inductive loads.

DC Voltage

The maximum operating DC voltage for the

TDA7370 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

duced.

The maximum allowable power dissipation de-

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

its thermal resistance); Fig. 23 shows the dissi-

pable power as a function of ambient temperature

for different thermal resistance.

Loudspeaker Protection

The TDA7370 guarantees safe operations even for

the loudspeaker in case of accidental shortcircuit.

circuit occurs both the outputs are switched OFF

so limiting dangerous DC current flowing through

the loudspeaker.

Figure 23: Maximum Allowable Power

Dissipation vs. Ambient Temperature

TDA7370

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