L7200 Datasheet, PDF (1/23 Pages) STMicroelectronics – MOZART, 12V DISK DRIVE SPINDLE & VCM, POWER & CONTROL “COMBO”

L7200
MOZART, 12V DISK DRIVE SPINDLE & VCM, POWER &
CONTROL “COMBO”
PRODUCT PREVIEW
GENERAL
s 12V (+/- 10%) OPERATION.
s REGISTER BASED ARCHITECTURE
s MINIMUM EXTERNAL COMPONENTS
s BCD TECHNOLOGY
MULTIPOWER BCD TECHNOLOGY
VCM DRIVER
s 1.7A DRIVE CAPABILITY
s 0.75Ω TOTAL BRIDGE IMPEDANCE AT 125°C
s LINEAR MODE
s PHASE SHIFT MODULATION (PWM MODE)
s INSTANTANEOUS, (GLICH FREE) SWITCH
s BETWEEN THE 2 MODES.
s CLASS AB OUTPUT DRIVERS
s ZERO CROSSOVER DISTORSION
s 14 BIT DAC DEFINE OUTPUT CURRENT
s SELECTABLE TRANSCONDUCTANCE
s RAMP LOADING & PARKING VOLTAGE
s FULL INTERNAL VCM CALIBRATION
s DYNAMIC BRAKE
SPINDLE DRIVER
s 2.5A DRIVE CAPABILITY
s 0.75Ω TOTAL BRIDGE IMPEDANCE AT
125°C
s SMOOTHDRIVE™ ARCHITECTURE
s SINUSOIDAL DRIVING, VOLTAGE MODE
s BIPOLAR DRIVING
s BEMF, INTERNAL OR EXTERNAL,
PROCESSING
s SENSOR-LESS MOTOR COMMUTATION
s PROGRAMMABLE COMMUTATION DELAY
s FIXED FREQUENCY PWM OPERATION
MODE
s INTERNAL FREQUENCY LOCKED LOOP
SPEED CONTROL (FLL)
s PROGRAMMABLE DIGITAL FILTER FOR
SPEED CONTROL LOOP
s BEMF RECTIFICATION DURING RETRACT
s BUILT-IN INDUCTIVE SENSING START UP
s DYNAMIC & REVERSE BRAKE
s BACK ROTATION DETECTION
TQFP64
ORDERING NUMBER: L7200
OTHER FUNCTIONS
s 12V, 5V , 3.3V AND 2.5V MONITORING WITH
POSSIBLE EXTERNAL SET TRIP POINTS
AND HYSTERESIS
s POWER UP/DOWN SEQUENCING
s 8V, 3.3V AND 2.5V POSITIVE REGULATORS
s 3.3V LOGIC COMPATIBILITY
s SHOCK SENSOR DETECTOR
s INTERNAL POR DELAY TIME AT POWER ON
(80ms)
s INTERNAL ISOFET FOR BEMF
RECTIFICATION
s THERMAL SHUTDOWN AND PRETHERMAL
WARNING
DESCRIPTION
The L7200 Mozart integrates into a single chip both
spindle and VCM controllers as well as power stag-
es. The device is designed for 12V disk drive appli-
cation requiring up to 2.5A of spindle and 1.7A of
VCM peak currents. The device is based on the sinu-
soidal driving of the spindle motor. This is realized
digitally by the SMOOTHDRIVE™ SYSTEM.
A serial port with up to 40 MHz capability provides
easy interface to the microprocessor. A register con-
trolled Frequency Locked Loop (FLL) allows flexibility
in setting the spindle speed. Integrated BEMF pro-
cessing, digital filter, digital masking, digital delay,
and sequencing minimize the number of external
components required.
September 1999
This is preliminary information on a new product now in development. Details are subject to change without notice.
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