L6226Q Ver la hoja de datos (PDF) - STMicroelectronics

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Fabricante

L6226Q

DMOS dual full bridge driver

STMicroelectronics 

L6226Q

Circuit description

4.2

Logic inputs

Pins IN1A, IN2A, IN1B, IN2B, ENA and ENB are TTL/CMOS and microcontroller compatible

logic inputs. The internal structure is shown in Figure 6. Typical value for turn-on and turn-off

thresholds are respectively Vthon = 1.8 V and Vthoff = 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 kΩ to 180 kΩ. Recommended values for REN and CEN are respectively 100 kΩ and

5.6 nF. More information on selecting the values is found in the overcurrent protection

section.

Figure 6. Logic inputs internal structure

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Figure 7. ENA and ENB pins open collector driving

Figure 8. ENA and ENB pins push-pull driving

Doc ID 14335 Rev 5

11/29

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