TDA2003

10W CAR RADIO AUDIO AMPLIFIER

www.artschip.com

6

BUILT-IN PROTECTION SYSTEMS

Load dump voltage surge

The TDA 2003 has a circuit which enables it to withstand a voltage pulse train, on pin 5, of the type shown in fig. 19.

If the supply voltage peaks to more than 40V, then an LC filter must be inserted between the supply and pin 5, in order to assure that

the pulses at pin 5 will be held within the limits shown in fig. 18.

A suggested LC network is shown in fig. 19. 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 ,This type of protection is ON when the supply voltage (pulsed DC)

exceeds 18V. For this reason the maximum operating supply voltage is 18V.

Figure 18.

Figure 19.

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 connected in series with the supply).

This feature is added to avoid destruction if , during fitting to the car, a mistaken 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 protection 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 TDA2003 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 permanent), oran excessive ambient temperature can be easily withstood.

2)

The heat-sink can have a smaller factor compared with that of a conventional circuit.

are reduced.