BUILD-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; all that

power dissipation depends upon the size of

the external heatsink (i.e. its thermal resis-

tance); Figure 12 shows this dissipable power

as a function of ambient temperature for dif-

ferent thermal resistance.

Short circuit (AC Conditions)

The TDA7262 can withstand accidental short cir-

cuits across the speaker made by a wrong con-

nection during normal play operation.

MOUNTING INSTRCTIONS

The power dissipated in the circuit must be re-

moved by adding an external heatsink.

Thanks to the MULTIWATT package attaching

the heatsink is very simple, a screw or a com-

pression spring (clip) being sufficient. between

the heatsink and the package it is better to insert

a layer of silicon grease, to optimize the thermal

contact; no electrical isolation is needed between

the two surfaces.

Figure 11: Total Power Dissipation & Efficiency

vs. Output Power

Figure 12

TDA7262

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