TDA2003
Figure 18.
Figure 19.
Short-circuit (AC and DC conditions)
The TDA 2003 can withstand a permanent short-
circuit on the output for a supply voltage up to 16V.
Polarity inversion
High current (up to 5A) can be handled by the
device with no damage for a longer period than the
blow-out time of a quick 1A fuse (normally con-
nected in series with the supply).
This feature is added to avoid destruction if, during
fitting to the car, a mistake on the connectionof the
supply is made.
Open ground
When the radio is in the ON condition and the
ground is accidentally opened, a standard audio
amplifier will be damaged. On the TDA 2003 pro-
tection diodes are included to avoid any damage.
Inductive load
A protection diode is provided between pin 4 and 5
(see the internal schematic diagram) to allow use
of the TDA 2003 with inductive loads.
In particular, the TDA 2003 can drive a coupling
transformer for audio modulation.
DC voltage
The maximum operating DC voltage on the TDA
2003 is 18V.
However the device can withstand a DC voltage up
to 28V with no damage. This could occur during
winter if two batteries were series connected to
crank the engine.
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), oran excessive ambient temperature can
be easily withstood.
2) the heat-sink can have a smaller factor com-
pared with that of a conventionalcircuit.
There is no device damage in the case of ex-
cessive junction temperature: all that happens
is that P
o
(and therefore P
tot
) and I
d
are reduced.
Figure 20. Output power and
dr a in cu r re n t vs . c ase
temperature (R
L
= 4Ω)
Figure 21. Output power and
d r ai n cu r re n t vs . c as e
temperature (R
L
= 2Ω)
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STMICROELECTRONICS [ STMICROELECTRONICS ]
