TDA2006 datasheet(9/12 Pages) STMICROELECTRONICS

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SHORT CIRCUIT PROTECTION

Figure 18 : Maximum Output Current versus

Voltage VCE (sat) accross each Out-

put Transistor

Figure 19 : Safe Operating Area and Collector

Characteristics of the Protected

Power Transistor

The TDA2006 has an original circuit which limits

the current of the output transistors. Figure 18

shows that the maximum output current is a func-

tion of the collector emitter voltage ; hence the

output transistors work within their safe operating

area (Figure 19).

This function can therefore be considered as being

peak power limiting rather than simple current lim-

iting.

It reduces the possibility that the device gets dam-

aged during an accidental short circuit from AC

output to ground.

THERMAL SHUT DOWN

The presence of a thermal limiting circuit offers the

following advantages :

1) an overload on the output (even if it is

permanent), or an abo ve l imi t ambien t

temperature can be easily supported since the

Tj cannot be higher than 150

°C.

2) the heatsink can have a smaller factor of safety

compared with that of a conventional circuit.

There is no possibility of device damage due to

high junction temperature.

If for any reason, the junction temperature in-

creases up to 150

°C, the thermal shutdown simply

reduces the power dissipation and the current con-

sumption.

The maximum allowable power dissipation de-

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

its thermal resistance) ; Figure 22 shows the dissi-

pable power as a function of ambient temperature

for different thermal resistances.

Figure 20 : Output Power and Drain Current ver-

sus Case Temlperature (RL =4

Ω)

Figure 21 : Output Power and Drain Current ver-

sus Case Temlperature (RL =8

Ω)

TDA2006

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