L6258

PWM CONTROLLED - HIGH CURRENT

DMOS UNIVERSAL MOTOR DRIVER

PRELIMINARY DATA

ABLE TO DRIVE BOTH WINDINGS OF A BI-

POLAR STEPPER MOTOR OR TWO DC MO-

TORS

OUTPUT CURRENT UP TO 1.5A EACH

WINDING

WIDE VOLTAGE RANGE: 12V TO 45V

FOUR QUADRANT CURRENT CONTROL,

IDEAL FOR MICROSTEPPING AND DC MO-

TOR CONTROL

PRECISION PWM CONTROL

NO NEED FOR RECIRCULATION DIODES

TTL/CMOS COMPATIBLE INPUTS

CROSS CONDUCTION PROTECTION

THERMAL SHUTDOWN

DESCRIPTION

L6258 is a dual full bridge for motor control appli-

cations realized in BCD technology, with the ca-

pability of driving both windings of a bipolar step-

per motor or bidirectionally control two DC

motors.

L6258 and a few external components form a

complete control and drive circuit. It has high effi-

ciency phase shift chopping that allows a very low

current ripple at the lowest current control levels,

and makes this device ideal for steppers as well

as for DC motors.

The power stage is a dual DMOS full bridge capa-

ble of sustaining up to 45V, and includes the di-

odes for current recirculation.

The output current capability is 1.5A per winding

in continuous mode, with peak start-up current up

to 2A.

A thermal protection circuitry disables the outputs

if the chip temperature exceeds the safe limits.

This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.

April 2000

®

DAC

CHARGE

PUMP

VCP1

PH_1

I0_1

I1_1

I2_1

VREF1

TRIANGLE

GENERATOR

TRI_CAP

ERROR

AMP

+

-

+

-

+

-

C

C

POWER

BRIDGE

1

TRI_0

TRI_180

TRI_180

TRI_0

DAC

PH_2

I0_2

I1_2

I2_2

VREF1

ERROR

AMP

+

-

+

-

+

-

C

C

POWER

BRIDGE

2

TRI_0

TRI_180

THERMAL

PROT.

OUT1A

OUT1B

SENSE1A

VBOOT

DISABLE

VS

OUT2A

OUT2B

SENSE2A

VS

EA_IN1

EA_OUT1

GND

EA_IN2

EA_OUT2

VCP2

D96IN430D

VR GEN

INPUT

&

SENSE

AMP

INPUT

&

SENSE

AMP

I3_1

I3_2

SENSE1B

SENSE2B

BLOCK DIAGRAM

ORDERING NUMBER: L6258

PowerSO36

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