TDA2005 查看數據表（PDF） - STMicroelectronics
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TDA2005 Datasheet PDF : 25 Pages
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Application information
TDA2005
4.1.7
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 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 happens is that Po (and therefore Ptot) and Id are reduced.
The maximum allowable power dissipation depends upon the size of the external heatsink
(i.e. its thermal resistance); Figure 37 shows the power dissipation as a function of ambient
temperature for different thermal resistance.
4.1.8
Loudspeaker protection
The circuit offers loudspeaker protection during short circuit for one wire to ground.
Figure 37. Maximum allowable power dissipa- Figure 38. Output power and drain current vs.
tion vs. ambient temperature
case temperature (RL = 4 )
0TOT
7
2
2TH
2TH #7
TH
#7
#7
4AMB #
'!0'03
Figure 39. Output power and drain current vs.
case temperature (RL = 3.2 )
0O
7
)D
0O
)D
!
63 6
2, 7
F K(Z
4CASE # '!0'03
0O
7
0O
)D
)D
!
63 6
2, 7
F K(Z
4CASE #
'!0'03
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Doc ID 1451 Rev 6
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