Application information

TDA2003A

12/19

Doc ID 018796 Rev 4

3

Application information

Figure 20.

Typical application circuit

Figure 21.

Printed circuit board and component layout for typical application circuit

3.1

Built-in protection systems

3.1.1

Load dump voltage surge

The TDA2003A has a circuit which enables it to withstand a voltage pulse train, on pin 5, of

the type shown in Figure 23.

If the supply voltage peaks to more than 40 V, then an LC filter must be inserted between

the supply and pin 5, in order to ensure that the pulses at pin 5 will be held within the limits

shown in Figure 22.

A recommended LC network is shown in Figure 23. With this network, a train of pulses with

amplitude up to 120 V and width of 2 ms can be applied at point A.

This type of protection is ON when the supply voltage (pulsed or DC) exceeds 18 V. For this

reason the maximum operating supply voltage is 18 V.