L634 datasheet(5/10 Pages) STMICROELECTRONICS

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ELECTRICAL CHARACTERISTICS (Vs = 42V ; Tj = 25°C unless otherwise specified)

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

Supply Voltage

Vref

Reference Voltage

Quiescent Supply Current

6.5

Thermal Shutdown

150

°C

Dead Time Protection

300

OUTPUT DMOS TRANSISTOR

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

IDSS

Leakage Current

1mA

RDS (ON)

ON Resistance

0.3

Ω

SOURCE DRAIN DIODE

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

VSD

Forward ON Voltage

ISD = 4A; EN = LOW

1.2

TRR

Reverse Recovery Time

IF = 4A

900

Tpr

Forward Recovery Time

200

LOGIC LEVELS

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

VINL, VENL

Input LOW Voltage

-0.3

0.8

VINH, VENH

Input HIGH Voltage

IINL, IENL

Input LOW Current

VIN,VEN = L

-10

µA

IINH, IENH

Input HIGH Current

VIN,VEN = H

µA

CIRCUIT DESCRIPTION

L6234 is a triple half bridge designed to drive

brushless DC motors.

Each half bridge has 2 power DMOS transistors

with RdsON = 0.3

Ω. The 3 half bridges can be

controlled independently by means of the 3 inputs

IN1, IN2, IN3 and the 3 inputs EN1, EN2, and

EN3. An external connection to the 3 common

low side DMOS sources is provided to connect a

sensing resistor for constant current chopping ap-

plication.

The driving stage and the logic stage are de-

signed to work from 7V to 52V.

L6234

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