STA7360 datasheet(14/18 Pages) STMICROELECTRONICS

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STA7360

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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.

DC Voltage

The maximum operating DC voltage for the STA7360

is 18V.

Thermal Shut-down

The presence of a thermal limiting circuit offers the

following advantages:

an overload on the output (even if it is perma-

nent), or an excessive ambient temperature can

be easily withstood.

)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 exces-

sive junction temperature: all happens is that Po

(and therefore Ptot) and Id are reduced.

The maximum allowable power dissipation depends

upon the size of the external heatsink (i.e. its thermal

resistance); Fig. 32 shows the dissipable power as a

function of ambient temperature for different thermal

resistance.

Figure 32. Maximum Allowable Power

Dissipation vs. Ambient Temperature

Loudspeaker Protection

The STA7360 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 33. Restart Circuit

APPLICATION HINTS

This section explains briefly how to get the best from

the STA7360 and presents some application circuits

with suggestions for the value of the components.

These values can change depending on the charac-

teristics that the designer of the car radio wants to ob-

tain,or other parts of the car radio that are connected

to the audio block.

To optimize the performance of the audio part it is

useful (or indispensable) to analyze also the parts

outside this block that can have an interconnection

with the amplifier.

This method can provide components and system

cost saving.

Reducing Turn On-Off Pop

The STA7360 has been designed in a way that the

turn on(off) transients are controlled through the

charge(discharge) of the Csvr capacitor.

As a result of it, the turn on(off) transient spectrum

contents is limited only to the subsonic range. The

following section gives some brief notes to get the

best from this design feature(it will refer mainly to the

stereo application which appears to be in most cases

the more critical from the pop viewpoint. The bridge

connection in fact,due to the common mode wave-

form at the outputs, does not give pop effect).

TURN-ON

Fig 34 shows the output waveform (before and after

the "A" weighting filter) compared to the value of Cs-

vr.

Better pop-on performance is obtained with higher

Csvr values (the recommended range is from 22uF to

220uF).

The turn-on delay (during which the amplifier is in

mute condition) is a function essentially of : Cout ,

Csvr .

Being:

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