TDA7370B datasheet(12/17 Pages) STMICROELECTRONICS

12 / 17 page

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 TDA7370B pro-

tection diodes are included to avoid any damage.

Inductive Load

A protection diode is provided to allow use of the

TDA7370B with inductive loads.

DC Voltage

The maximum operating DC voltage for the

TDA7370B 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. 23 shows the dissi-

pable power as a function of ambient temperature

for different thermal resistance.

Loudspeaker Protection

The TDA7370B guarantees safe operations even for

the loudspeaker in case of accidental shortcircuit.

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 23: Maximum Allowable Power

Dissipation vs. Ambient Temperature

TDA7370B

12/17

Obsolete

Product(s)

- Obsolete

Product(s)

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