TDA7370BV Datasheet, PDF (12/17 Pages) STMicroelectronics – QUAD POWER AMPLIFIER FOR CAR RADIO

TDA7370B
Polarity Inversion
High current (up to 10A) can be handled by the
device 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 fea-
tures is added to avoid destruction, if during fitting
to the car, a mistake on the connection of the
supply is made.
Open Ground
safety compared with that of a conventional
circuit. There is no device damage in case of
excessive junction temperature: all happens
is that Po (and therefore Ptot) and Id are re-
duced.
The maximum allowable power dissipation de-
pends upon the size of the external heatsink (i.e.
its thermal resistance); Fig. 23 shows the dissi-
pable power as a function of ambient temperature
for different thermal resistance.
When the radio is in the ON condition and the _{Figure 23: Maximum Allowable Power}
ground is accidentally opened, a standard audio
Dissipation vs. Ambient Temperature
amplifier will be damaged. On the TDA7370B pro-
tection diodes are included to avoid any damage.
t(s) ^{Inductive Load}
c _{A protection diode is provided to allow use of the}
u _{TDA7370B with inductive loads.}
rod _{DC Voltage}
P _{The maximum operating DC voltage for the}
te ^{TDA7370B is 18V.}
le ^{However the device can withstand a DC voltage}
up to 28V with no damage. This could occur dur-
o _{ing winter if two batteries are series connected to}
s _{crank the engine.}
- ^Ob Thermal Shut-down
) _{The presence of a thermal limiting circuit offers}
t(s ^{the following advantages:}
1)an overload on the output (even if it is perma-
uc ^{nent), or an excessive ambient temperature}
d ^{can be easily withstood.}
Obsolete ^{Pro 2)the heatsink can have a smaller factor of}
Loudspeaker Protection
The TDA7370B guarantees safe operations even for
the loudspeaker in case of accidental shortcircuit.
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.
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