TDA7360 Datasheet, PDF (15/22 Pages) STMicroelectronics – 22W BRIDGE / STEREO AUDIO AMPLIFIER WITH CLIPPING DETECTOR

Load Dump Voltage Surge
The TDA 7360 has a circuit which enables it to
withstand a voltage pulse train on pin 9, of the type
shown in fig. 37.
If the supply voltage peaks to more than 50V, then
an LC filter must be inserted between the supply
and pin 9, in order to assure that the pulses at pin 9
will be held within the limits shown.
A suggestedLC network is shown in fig. 36.
With this network, a train of pulses with amplitude up
to 120V and width of 2ms can be applied at point A.
This type of protection is ON when the supplyvoltage
(pulse or DC) exceeds 18V. For this reason the maxi-
mum operating supply voltage is 18V.
Figure 36
Figure 37
TDA7360
ing winter 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 overload on the output (even if it is perma-
nent), 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 ex-
cessive junction temperature: all happens is
that P_o (and therefore P_tot) and I_d are reduced.
The maximum allowable power dissipation de-
pends upon the size of the external heatsink (i.e.
its thermal resistance); Fig. 38 shows the dissi-
pable power as a function of ambient temperature
for different thermal resistance.
Figure 38: Maximum Allowable Power
Dissipation vs. Ambient Temperature
Polarity Inversion
High current (up to 10A) can be handled by the de-
vice with no damage for a longer period than the
blow-out time of a quick 2A fuse (normally connected
in series with the supply). This features is added to
avoid destruction, if during fitting to the car, a mistake
on the connection of 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 TDA7360 pro-
tection diodes are included to avoid any damage.
DC Voltage
The maximum operating DC voltage for the
TDA7360 is 18V.
However the device can withstand a DC voltage
up to 28V with no damage. This could occur dur-
Loudspeaker Protection
The TDA7360 guarantees safe operations even
for the loudspeaker in case of accidental shortcir-
cuit.
Whenever a single OUT to GND, OUT to VS short
circuit occurs both the outputs are switched OFF
so limiting dangerous DC current flowing through
the loudspeaker.
Figure 39: Restart Circuit
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