TDA2004 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
TDA2004 Datasheet PDF : 10 Pages
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TDA2004A
BUILT–IN PROTECTION SYSTEMS
LOAD DUMP VOLTAGE SURGE
The TDA2004A has a circuit which enables it to wi-
thstand a voltage pulse train, on pin 9, of the type
shown in Fig. 19.
If the supply voltage peaks to more than 40 V, then
an LC filter must be insertedbetweenthe supplyand
pin 9, in order to assure that the pulses at pin 9 will
be held within the limits shown.
A suggested LC network is shown in Fig. 18. With
this network, a train of pulsewith amplitude up to 120
V and with of 2 ms can be applied to point A. This
type of protection is ON when the supply voltage
(pulse or DC) exceeds18 V. For this reason the ma-
ximum operating supply voltage is 18 V.
Figure 18.
Figure 19.
SHORT CIRCUIT (AC conditions)
The TDA2004A can withstand an accidental short-
circuit from the output to ground caused by a wrong
connection during normal working.
POLARITY INVERSION
High current (up to 10 A) can be handled by the de-
vice with no damage for a longer period than the
blow-out time of a quick 2 A fuse (normally connec-
ted in series with the supply). This feature is added
to avoid destruction, if during fitting to the car, a mi-
stake on the connection of the supply is made.
OPEN GROUND
When the ratio is the ON condition and the ground
is accidentally opened, a standard audio amplifier
will be damaged. On the TDA2004A protection dio-
des are included to avoid any damage.
INDUCTIVE LOAD
A protection diode is provided to allow use of the
TDA2004A with inductive loads.
DC VOLTAGE
The maximum operating DC voltage on the
TDA2004A is 18 V.
However the device can withstand a DC voltage up
to 28V withno damage. This could occurduring win-
ter if two batteries are series connected to crank the
engine.
THERMAL SHUT-DOWN
The presence of a thermal limiting circuit offers the
following advantages :
1) an overloadon 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 jun-
ction temperature ; all that happens is the PO (and
therefore Ptot) and Id are reduced.
The maximum allowable power dissipationdepends
upon the size of the external heatsink(i.e. its thermal
resistance) ; fig. 15 shown this dissipable power as
a function of ambient temperature for different ther-
mal resistance.
8/10
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