TDA7360 datasheet(15/22 Pages) STMICROELECTRONICS

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Load Dump Voltage Surge

The TDA 7360 has a circuit which enables it to

withstand a voltage pulse train on pin 9, of the type

shown in fig. 37.

If the supply voltage peaks to more than 50V, then

an LC filter must be inserted between the supply

and pin 9, in order to assure that the pulses at pin 9

will be held within the limits shown.

A suggestedLC network is shown in fig. 36.

With this network, a train of pulses with amplitude up

to 120V and width of 2ms can be applied at point A.

This type of protection is ON when the supply voltage

(pulse or DC) exceeds 18V. For this reason the maxi-

mum operating supply voltage is 18V.

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 connected

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.

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 TDA7360 pro-

tection diodes are included to avoid any damage.

DC Voltage

The maximum operating DC voltage for the

TDA7360 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 the case of ex-

cessive 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. 38 shows the dissi-

pable power as a function of ambient temperature

for different thermal resistance.

Loudspeaker Protection

The TDA7360 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 36

Figure 37

Figure 38: Maximum Allowable Power

Dissipation vs. Ambient Temperature

Figure 39: Restart Circuit

TDA7360

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