Application information
TDA2003A
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.
12/19
Doc ID 018796 Rev 4
STMICROELECTRONICS [ ST ]
