TDA7350 STMicroelectronics, TDA7350 Datasheet - Page 15

• Manufacturer Part Number: TDA7350
• Description: IC AMP AUDIO PWR 22W MULTIWATT11
• Manufacturer: STMicroelectronics
• Type: Class ABr

Specifications of TDA7350

• Output Type: 1-Channel (Mono) or 2-Channel (Stereo)
• Max Output Power X Channels @ Load: 22W x 1 @ 3.2 Ohm; 11W x 2 @ 2 Ohm
• Voltage - Supply: 8 V ~ 18 V
• Features: Depop, Short-Circuit and Thermal Protection, Standby
• Mounting Type: Through Hole
• Package / Case: Multiwatt-11 (Vertical, Bent and Staggered Leads)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Load Dump Voltage Surge
The TDA 7350 has a circuit which enables it to
withstand a voltage pulse train on pin 9, of the
type shown in fig. 36.
If the supply voltage peaks to more than 40V,
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 suggested LC network is shown in fig. 35.
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
supply voltage (pulse or DC) exceeds 18V. For
this reason the maximum operating supply volt-
age is 18V.
Figure 35
Figure 36
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
When the radio is in the ON condition and the
ground is accidentally opened, a standard audio
amplifier will be damaged. On the TDA7350 pro-
tection diodes are included to avoid any damage.
DC Voltage
The maximum operating DC voltage for the
TDA7350 is 18V.
However the device can withstand a DC voltage
up to 28V with no damage. This could occur dur-
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:
The maximum allowable power dissipation de-
pends upon the size of the external heatsink (i.e.
its thermal resistance); Fig. 37 shows the dissi-
pable power as a function of ambient temperature
for different thermal resistance.
Figure 37: Maximum Allowable Power
Loudspeaker Protection
The TDA7350 guarantees safe operations even
for the loudspeaker in case of accidental shortcir-
cuit.
Whenever a single OUT to GND, OUT to V
circuit occurs both the outputs are switched OFF
so limiting dangerous DC current flowing through
the loudspeaker.
Figure 38: Restart Circuit
1)an overload on the output (even if it is perma-
2)the heatsink can have a smaller factor of
nent), or an excessive ambient temperature
can be easily withstood.
safety compared with that of a conventional
circuit. There is no device damage in the case
of excessive junction temperature: all hap-
pens is that P
reduced.
Dissipation vs. Ambient Temperature
o
(and therefore P
tot
) and I
TDA7350
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d
short
15/22
are