L6238

SENSORLESS SPINDLE MOTOR CONTROLLER

PRODUCT PREVIEW

2.5A, THREE-PHASE OUTPUT DRIVE

PRECISION DIGITAL PLL

FULLY-INTEGRATED ALIGN + GO

START-UP ALGORITHM

DIGITAL BEMF PROCESSING

MASTER/SLAVE SYNCHRONIZATION

BIDIRECTIONAL SERIAL PORT

STAND ALONE OR EXT. DRIVER

SHOOT-THROUGH PROTECTION

DESCRIPTION

The L6238 is a complete Three-Phase, D.C.

Brushless Spindle Motor Driver system. The de-

vice features both the Power and Control Sec-

tions and will operate Stand Alone, or can be

used in Higher Power Applications with the addi-

tion of an external Linear Driver.

Start-Up can be achieved with the Fully-Inte-

grated Align + GO Algorithm or may be se-

quenced manually for User-Defined start-up algo-

rithms.

A Digital PLL provides high accuracy and the ca-

pability to do Master/Slave Synchronization for

Disk Array configurations.

Programmable functions include commutation

Timing Adjustment and Slew Rate Control for

peak efficiency and minimum noise.

Protective 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.

June 1993

BLOCK DIAGRAM

PLCC44

ORDERING NUMBER: L6238

1/35