Circuit description

L6206

12/29

DocID07617 Rev 4

5.2

Logic inputs

Pins IN1A, IN2A, IN1B, IN2B, ENA and ENB are TTL/CMOS compatible logic inputs. The

internal structure is shown in Figure 6. Typical value for turn-on and turn-off thresholds are

respectively Vth(ON) = 1.8 V and Vth(OFF) = 1.3 V.

Pins ENA and ENB are commonly used to implement overcurrent and thermal protection by

connecting them respectively to the outputs OCDA and OCDB, which are open drain

outputs. If that type of connection is chosen, some care needs to be taken in driving these

pins. Two configurations are shown in Figure 7 and Figure 8. If driven by an open drain

(collector) structure, a pull-up resistor REN and a capacitor CEN are connected as shown in

Figure 7. If the driver is a standard push-pull structure, the resistor REN and the capacitor

CEN are connected as shown in Figure 8. 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. More information on selecting the values is found in Section 5.3: Non-dissipative

overcurrent detection and protection.

Figure 6. Logic inputs internal structure

Figure 7. ENA and ENB pins open collector driving

Figure 8. ENA and ENB pins push-pull driving