TDA2006 ST Microelectronics, TDA2006 Datasheet - Page 9

• Manufacturer Part Number: TDA2006
• Description: 12W AUDIO AMPLIFIER
• Manufacturer: ST Microelectronics

Figure 18 : Maximum Output Current versus
SHORT CIRCUIT PROTECTION
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
2) the heatsink can have a smaller factor of safety
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.
permanent), or an abo ve limit ambien t
temperature can be easily supported since the
T
compared with that of a conventional circuit.
There is no possibility of device damage due to
high junction temperature.
j
cannot be higher than 150 C.
put Transistor
Voltage V
CE (sat)
accross each Out-
Figure 19 : Safe Operating Area and Collector
Figure 20 : Output Power and Drain Current ver-
Figure 21 : Output Power and Drain Current ver-
Characteristics of the Protected
Power Transistor
sus Case Temlperature (R
sus Case Temlperature (R
L
L
TDA2006
= 4 )
= 8 )
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