Short-circuit (AC and DC conditions)

The TDA 2003 can withstand a permanent short-

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

Polarity inversion

High current (up to 5A) can be handled by the

device with no damage for a longer period than the

blow-out time of a quick 1A 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 radio is in the ON condition and the

ground is accidentally opened, a standard audio

amplifier will be damaged. On the TDA 2003 pro-

tection diodes are included to avoid any damage.

Inductive load

A protection diode is provided between pin 4 and 5

(see the internal schematic diagram) to allow use

of the TDA 2003 with inductive loads.

In particular, the TDA 2003 can drive a coupling

transformer for audio modulation.

DC voltage

The maximum operating DC voltage on the TDA

2003 is 18V.

However the device can withstand a DC voltage up

to 28V with no damage. This could occur during

winter if two batteries were 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), oran excessive ambient temperature can

be easily withstood.

2) the heat-sink can have a smaller factor com-

pared with that of a conventional circuit.

There is no device damage in the case of ex-

cessive junction temperature: all that happens

Figure 20. Output power and

dra i n

cu rre nt

vs .

case

Ω)

Figure 21. Output power and

d rai n

cur ren t

vs.

c ase

Ω)

Figure 18.

Figure 19.

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TDA2003