BUILT-IN PROTECTION SYSTEMS

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 excessive junction temperature; if for any

reason the junction temperature increases up

to 145

°C. the thermal shutdown simply re-

duces the output power and therefore the

power dissipation.

The maximum allowable power dissipation de-

pends upon the thermal resistance junction-ambi-

ent. Figure 8 shows the dissipable power as a

function of ambient temperature for different

heatsink thermal resistance.

SHORT CIRCUIT (AC CONDITIONS)

The TDA7263 can withstand accidental short cir-

cuits across the speaker made by a wrong con-

nection during normal play operation.

TDA7263

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