L6208PD datasheet(10/27 Pages) STMICROELECTRONICS

10 / 27 page

L6208

10/27

Figure 6. Charge Pump Circuit

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

Vth(ON)= 1.8V and Vth(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 REN and a capacitor CEN are connected as shown in Fig. 8. If the

driver is a standard Push-Pull structure the resistor REN and the capacitor CEN are connected as shown in Fig.

9. The resistor REN should be chosen in the range from 2.2K

Ω to 180KΩ. Recommended values for REN and

CEN are respectively 100K

Ω and 5.6nF. More information on selecting the values is found in the Overcurrent

Protection section.

Figure 7. Logic Inputs Internal Structure

Figure 8. EN Pin Open Collector Driving

Figure 9. EN Pin Push-Pull Driving

CBOOT

VSA

VCP

VBOOT

VSB

D01IN1328

D01IN1329

ESD

PROTECTION

OPEN

COLLECTOR

OUTPUT

REN

CEN

D01IN1330

ESD

PROTECTION

PUSH-PULL

OUTPUT

REN

CEN

D01IN1331

ESD

PROTECTION

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