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TDA2030V Datasheet(PDF) 9 Page - STMicroelectronics

No. de pieza TDA2030V
Descripción Electrónicos  14W Hi-Fi AUDIO AMPLIFIER
Download  12 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
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TDA2030V Datasheet(HTML) 9 Page - STMicroelectronics

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SHORT CIRCUIT PROTECTION
The TDA2030 has an original circuit which limits the
current of the output transistors. Fig. 18 shows that
the maximum output current is a function of the
collector emitter voltage; hence the output transis-
tors work within their safe operating area (Fig. 2).
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.
Fi g ure 1 8. M aximum
ou t pu t
c urr en t
vs.
voltage [VCEsat] across
each output transistor
Figure 19. Safe operating area and
collector characteristics of the
protected power transistor
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 above limit ambient 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 increases up to 150
°C, the
thermal shut-down simply reduces the power
dissipation at the current consumption.
The maximum allowable power dissipation de-
pends upon the size of the external heatsink (i.e. its
thermal resistance); fig. 22 shows this dissipable
power as a function of ambient temperature for
different thermal resistance.
TDA2030
9/12


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