DocID029313 Rev 3

17/26

STSPIN240

Functional description

26

TOFF adjustment

The decay time is adjusted through an external resistor connected between the TOFF pin

and ground as shown in Figure 6. A small RC series must be inserted in parallel with the

regulator resistor in order to increase the stability of the regulation circuit according to

indications listed in Table 10.

Figure 6. OFF time regulation circuit

The relation between the OFF time and the external resistor value is shown in the graph of

Figure 7. The value typically ranges from 10 µs to 150 µs.

10 k

1 k



22 nF

82 k

2.2 k



22 nF