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DESCRIPTION

The L7200 Mozart integrates into a single chip both spindle and VCM controllers as well as power stages. The device is designed for 12V disk drive application requiring up to 2.5A of spindle and 1.7A of VCM peak currents. The device is based on the sinusoidal driving of the spindle motor. This is realized digitally by the SMOOTHDRIVE? SYSTEM.

GENERAL

■ 12V (+/- 10) OPERATION.

■ REGISTER BASED ARCHITECTURE

■ MINIMUM EXTERNAL COMPONENTS

■ BCD TECHNOLOGY

VCM DRIVER

■ 1.7A DRIVE CAPABILITY

■ 0.75? TOTAL BRIDGE IMPEDANCE AT 125°C

■ LINEAR MODE

■ PHASE SHIFT MODULATION (PWM MODE)

■ INSTANTANEOUS, (GLICH FREE) SWITCH

■ BETWEEN THE 2 MODES.

■ CLASS AB OUTPUT DRIVERS

■ ZERO CROSSOVER DISTORSION

■ 14 BIT DAC DEFINE OUTPUT CURRENT

■ SELECTABLE TRANSCONDUCTANCE

■ RAMP LOADING & PARKING VOLTAGE

■ FULL INTERNAL VCM CALIBRATION

■ DYNAMIC BRAKE

SPINDLE DRIVER

■ 2.5A DRIVE CAPABILITY

■ 0.75? TOTAL BRIDGE IMPEDANCE AT 125°C

■ SMOOTHDRIVE? ARCHITECTURE

■ SINUSOIDAL DRIVING, VOLTAGE MODE

■ BIPOLAR DRIVING

■ BEMF, INTERNAL OR EXTERNAL, PROCESSING

■ SENSOR-LESS MOTOR COMMUTATION

■ PROGRAMMABLE COMMUTATION DELAY

■ FIXED FREQUENCY PWM OPERATION MODE

■ INTERNAL FREQUENCY LOCKED LOOP SPEED CONTROL (FLL)

■ PROGRAMMABLE DIGITAL FILTER FOR SPEED CONTROL LOOP

■ BEMF RECTIFICATION DURING RETRACT

■ BUILT-IN INDUCTIVE SENSING START UP

■ DYNAMIC & REVERSE BRAKE

■ BACK ROTATION DETECTION

OTHER FUNCTIONS

■ 12V, 5V , 3.3V AND 2.5V MONITORING WITH POSSIBLE EXTERNAL SET TRIP POINTS AND HYSTERESIS

■ POWER UP/DOWN SEQUENCING

■ 8V, 3.3V AND 2.5V POSITIVE REGULATORS

■ 3.3V LOGIC COMPATIBILITY

■ SHOCK SENSOR DETECTOR

■ INTERNAL POR DELAY TIME AT POWER ON (80ms)

■ INTERNAL ISOFET FOR BEMF RECTIFICATION

■ THERMAL SHUTDOWN AND PRETHERMAL WARNING