L6208 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

L6208

DMOS driver for bipolar stepper motor

STMicroelectronics 

L6208

5.2

Circuit description

Logic inputs

Pins CONTROL, HALF/FULL, CLOCK, RESET and CW/CCW are TTL/CMOS compatible

logic inputs. The internal structure is shown in Figure 9. Typical value for turn-on and turn-off

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

Pin EN (“Enable”) 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 10 or Figure 11. If driven by an open drain

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

Figure 10. If the driver is a standard Push-Pull structure the resistor REN and the capacitor

CEN are connected as shown in Figure 11. 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 7.5: Non-dissipative

overcurrent protection on page 21.

Figure 9. Logic inputs internal structure

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Figure 10. EN pin open collector driving

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Figure 11. EN pin push-pull driving

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