TDA7350A datasheet(15/23 Pages) STMICROELECTRONICS

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TDA7350A

Figure 39.

4.9.3 Polarity Inversion

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

vice with no damage for a longer period than the

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

nected in series with the supply). This features is

added to avoid destruction, if during fitting to the

car, a mistake on the connection of the supply is

made.

4.10 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 TDA7350A pro-

tection diodes are included to avoid any damage.

4.10.1DC Voltage

The maximum operating DC voltage for the

TDA7350A is 18V. However the device can with-

stand a DC voltage up to 28V with no damage.

This could occur during winter if two batteries are

series connected to crank the engine.

4.10.2Thermal 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 the case of exces-

sive junction temperature: all happens is that Po

(and therefore Ptot) and Id are reduced.

The maximum allowable power dissipation de-

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

its thermal resistance); Fig. 40 shows the dissi-

pable power as a function of ambient temperature

for different thermal resistance.

Figure 40. Maximum Allowable Power

Dissipation vs. Ambient Temperature

The TDA7350A 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 41. Restart Circuit

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