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L6245 Datasheet

  • L6245

  • 5V HARD DISK DRIVE POWER COMBO

  • 192.74KB

  • 15頁(yè)

  • STMICROELECTRONICS   STMICROELECTRONICS

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L6245
5V HARD DISK DRIVE POWER COMBO
PRODUCT PREVIEW
General
+5V OPERATION
REGISTER BASED ARCHITECTURE
MINIMUM EXTERNAL COMPONENTS
SLEEP AND IDLE MODES FOR LOW
POWER CONSUMPTION
SELECTABLE GAINS FOR BOTH VCM AND
SPINDLE Gm LOOP
LINEAR CURRENT CONTROL LOOPS FOR
BOTH VCM AND SPINDLE
8 BIT D/A FOR ACTUATOR DRIVER AND
SPINDLE DRIVER
VCM Driver
CURRENT SENSE CONTROL (VOLTAGE
PROPORTIONAL TO CURRENT)
VOLTAGE SENSE CONTROL (VOLTAGE
PROPORTIONAL
TO
THE
VOLTAGE
ACROSS THE VCM)
TWO CURRENT RANGES FOR SEEKING
AND TRACKING
INTERNAL REGISTER FOR POWER AMP
CONTROL LINES
SPEED OUTPUT (VOLTAGE PROPOR-
TIONAL TO BEMF)
Spindle Driver
BEMF PROCESSING FOR SENSORLESS
MOTOR COMMUTATION
PROGRAMMABLE COMMUTATION PHASE
DELAY
PROGRAMMABLE SLEW-RATE FOR RE-
DUCED EMI
0.7鈩?TYP. FOR ANY HALF BRIDGE
CROSS CONDUCTION PROTECTION
SYNTHESIZED HALL OUTPUT
Other Functions
POWER UP SEQUENCING
POWER DOWN SEQUENCING
LOW VOLTAGE SENSE
ACTUATOR RETRACTION
DYNAMIC BRAKE
THERMAL SHUTDOWN
October 1992
MULTIPOWER BCD TECHNOLOGY
PQFP64
ORDERING NUMBER:
L6245
DESCRIPTION
The L6245 contains in a single chip all the func-
tions to operate a sensorless brushless (DC) mo-
tor and a voice coil motor, suitable for hard disk
drive applications.
The device is configured to interface directly to
an 8 bit parallel microprocessor bus, and has a
register based architecture to reduce number of
interconnection lines. All the positioning loop for
sensorless spindle is integrated, including BEMF
sensing, digital masking, digital delay and se-
quencing. All timing function are performed digi-
tally, thus no external filtering components are re-
quired.
The VCM driver is a transconductance amplifier,
able to provide 2 different current ranges, suitable
for seeking or tracking of the head actuator.
When a low voltage is detected, a monitor, in se-
quence, resets the internal registers, puts in tris-
tate the spindle powers, retracts the actuator, and
applies the dynamic brake of the spindle.
The L6245 is realized in Multipower-BCD 2 tech-
nology, which combine isolate DMOS power tran-
sistors with CMOS and Bipolar circuits in the
same monolithic layer, and is assembled in a 64-
pin PQFP.
1/15
This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.

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