Circuit description

L6230

12/24

Doc ID 18094 Rev 2

5.2

Logic inputs

Pins INx and ENx are TTL/CMOS and microcontroller compatible logic inputs. The internal

structure is shown in Figure 7. Typical value for turn-on and turn-off thresholds are

respectively V

Pin DIAG-EN has identical input structure with the exception that the drain of the

Overcurrent and thermal protection MOSFET is also connected to this pin. Due to this

connection some care needs to be taken in driving this pin. The EN input may be driven in

one of two configurations as shown in Figure 8 or Figure 9. If driven by an open drain

Figure 8. If the driver is a standard Push-Pull structure the resistor R

are connected as shown in Figure 9. The resistor R

2.2 k

Ω to 180 kΩ. Recommended values for R

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

Figure 7.

Logic inputs internal structure

Figure 8.

Pin DIAG-EN open collector driving

Figure 9.

Pin DIAG-EN push-pull driving

5V

D01IN1329

ESD

PROTECTION

5V

5V

OPEN

COLLECTOR

OUTPUT

DIAG-EN

D01IN1330

ESD

PROTECTION

5V

PUSH-PULL

OUTPUT

DIAG-EN

D01IN1331

ESD

PROTECTION