L6206Q datasheet(12/27 Pages) STMICROELECTRONICS

12 / 27 page

Circuit description

L6206Q

12/27

DocID022028 Rev 3

The disable time (tDISABLE), before recovering normal operation, can be easily programmed

by means of the accurate thresholds of the logic inputs. It is affected either by CEN or REN

values and its magnitude is reported in Figure 12. The delay time (tDELAY), before turning off

the bridge when an overcurrent has been detected, depends only on the CEN value. Its

magnitude is reported in Figure 13.

CEN is also used for providing immunity to pin EN against fast transient noises. Therefore

the value of CEN should be chosen as big as possible according to the maximum tolerable

delay time and the REN value should be chosen according to the desired disable time.

The resistor REN should be chosen in the range from 2.2 k to 180 k. Recommended

values for REN and CEN are respectively 100 k and 5.6 nF which allow a 200 µs disable

time to be obtained.

Figure 9. Overcurrent protection simplified schematic

L6206Q Datasheet(PDF) 12 Page - STMicroelectronics