EVAL6208N Datasheet, PDF (10/27 Pages) STMicroelectronics – DMOS DRIVER FOR BIPOLAR STEPPER MOTOR

L6208
Figure 6. Charge Pump Circuit
V_S
D1
D2
C_BOOT
R_P
C_P
VCP VBOOT
VS_A VS_B D01IN1328
LOGIC INPUTS
Pins CONTROL, HALF/FULL, CLOCK, RESET and CW/CCW are TTL/CMOS and uC compatible logic inputs.
The internal structure is shown in Fig. 7. Typical value for turn-on and turn-off thresholds are respectively
V_th(ON)= 1.8V and V_th(OFF)= 1.3V.
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 Fig. 8 or 9. If driven by an open
drain (collector) structure, a pull-up resistor R_EN and a capacitor C_EN are connected as shown in Fig. 8. If the
driver is a standard Push-Pull structure the resistor R_EN and the capacitor C_EN are connected as shown in Fig.
9. The resistor R_EN should be chosen in the range from 2.2KΩ to 180KΩ. Recommended values for R_EN and
C_EN are respectively 100KΩ and 5.6nF. More information on selecting the values is found in the Overcurrent
Protection section.
Figure 7. Logic Inputs Internal Structure
5V
ESD
PROTECTION
D01IN1329
Figure 8. EN Pin Open Collector Driving
5V
OPEN
COLLECTOR
OUTPUT
R_EN
EN
C_EN
ESD
PROTECTION
5V
D01IN1330
Figure 9. EN Pin Push-Pull Driving
PUSH-PULL
R_EN
EN
OUTPUT
C_EN
ESD
PROTECTION
5V
D01IN1331
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