TDA2005 datasheet(17/20 Pages) STMICROELECTRONICS

17 / 20 page

BUILT-IN PROTECTION SYSTEMS

Load Dump Voltage Surge

The TDA2005 has a circuit which enables it to

withstanda voltagepulse train, on Pin 9, of the type

shown in Figure 34.

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 withing the limits shown.

A suggestedLC networkis shownin Figure33.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 voltage is 18V.

Figure 33

Figure 34

Short Circuit (AC and DC conditions)

The TDA2005 can withstanda permanentshort-cir-

cuit on the output for a supply voltage up to 16V.

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 con-

nected in series with the supply). This feature 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 ratio is in the ON condition and the

ground is accidentally opened, a standard audio

amplifier will be damaged.On the TDA2005 protec-

tion diodes are included to avoid any damage.

Inductive Load

A protection diode is provided to allow use of the

TDA2005 with inductive loads.

DC Voltage

The maximum operating DC voltage for the

TDA2005 is 18V.

However the device can withstand a DC voltage up

to 28V with no damage. This could occur during

winter if twobatteries are series connectedto 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

p er m anent ) , o r an ex c es si ve a mb i ent

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

excessive junction temperature : all that

happens is that PO (and thereforePtot) and Id are

reduced.

The maximum allowable power dissipation de-

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

thermal resistance) ; Figure 35 shows the dissipa-

ble power as a function of ambient temperature for

different thermal resistance.

Loudspeaker Protection

The circuit offers loudspeaker protection during

short circuit for one wire to ground.

TDA2005

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