L6238S

12V SENSORLESS SPINDLE MOTOR CONTROLLER

PRODUCT PREVIEW

12V OPERATION

3A, THREE-PHASE DMOS OUTPUT

Ω)

NO HALL SENSORS REQUIRED

DIGITAL BEMF PROCESSING

LINEAR OR PWM CONTROL

STAND ALONE OR EXT. DRIVER

SHOOT-THROUGH PROTECTION

THERMAL SHUTDOWN

DESCRIPTION

The L6238S is a Three-Phase, D.C. Brushless

Spindle Motor Driver system. This device features

both the Power and Sequence Sections.

Higher Power Applications can be activied with

the addition of an external Linear Driver, or by op-

erating the Internal Drivers in PWM.

Motor Start-Up, without the use of Hall Sensors,

can be achieved either by an internal start-up al-

gorithm or by manually sequencing the Output

Drivers, using a variety of User-Defined Start-UP

Algorithms.

Protection features include Stuck Rotor\Backward

Rotation Detection and Automatic Thermal Shut-

down.

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

October 1995

ZERO

CROSSING

DETECTOR

ALIGN + GO

START-UP

ONE-SHOT

SLEW-CTRL

PWM

LIN

VL

THERMAL

SHUTDOWM

OT-WARN

CHARGE

PUMP

CPUMP3

CPUMP1

CPUMP2

D95IN232

BIAS

POWER

STAGE

AV=4V/V

DIGITAL

DELAY

OUT B

OUT C

CTR TAP

CSA INPUT

GND

PWM

TIM

VANALOG

+

+

+

-

BEMF

SENSE

VPOWER

BRAKE

DELAY

RSENSE1

DRV

CNTL

TDLY(0)

+

-

CSA

OUT A

GATE DRIVE

GM COMP

SYSTEM

CLOCK

SYS CLOCK

RSENSE2

VCTRL

PWM

COMP

PWM/

SLEW

SEQUENCER

FALIGN

OUTPUT

ENABLE

RUN/

BRAKE

SEQ INCR

MONO/SEQ

CTRL

TDLY(1)

TDLY(2)

MONO

DET

MASK DLY

TOGGLE

DIVIDE

BY N

SPIN

SENSE

FMTR

SEL POL

BLOCK DIAGRAM

ORDERING NUMBERS: L6238S (PLCC44)

L6238SQA (PQFP44)

L6238SQT (TQFP64)

PLCC44

PQFP44

TQF P64

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