L6260 Spindle Motor And Voice Coil Controller Datasheet

L6260 4.5 - 5.5V DISK DRIVER SPINDLE & VCM, POWER & CONTROL COMBO

GENERAL 5V OPERATION. *REGISTER BASED ARCHITECTURE MINIMUM EXTERNAL COMPONENTS SLEEP AND IDLE MODES FOR LOW POWER CONSUMPTION SELECTABLE GAINS FOR BOTH V.C.M. AND SPINDLE 10 BIT (+ SIGN + GAIN ) VCM & 8 BIT SPINDLE DACs HIGH BANDWIDTH SPEED REGULATION LOOP (ONCE PER MECH\ELEC CYCLE ACCURACY)
VCM DRIVER CURRENT SENSE CONTROL (VOLTAGE PROPORTIONAL TO CURRENT) 300mA DRIVE CAPABILITY TWO CURRENT RANGES FOR SEEKING AND TRACKING INTERNAL REGISTER FOR POWER AMP CONTROL LINES
SPINDLE DRIVER BEMF PROCESSING FOR SENSORLESS MOTOR COMMUTATION PROGRAMMABLE COMMUTATION PHASE DELAY PROGRAMMABLE SLEW-RATE FOR REDUCED E.M.I. 0.8Ω FOR ANY HALF BRIDGE WORST CASE
SYNCHRONOUS RECTIFICATION OF THE B.E.M.F. DURING RETRACT OPERATION BIPOLAR \ TRIPOLAR OPERATION SYNTHESIZED HALL OUTPUTS 1.0 AMP DRIVE CAPABILITY
OTHER FUNCTIONS POWER UP SEQUENCING POWER DOWN SEQUENCING LOW VOLTAGE SENSE ACTUATOR RETRACTION DYNAMIC BRAKE THERMAL SHUTDOWN

The L6260 is single chip sensorless (DC) spindle motor and voice coil controllers including power stages suitable for use in small disk drives. These devices have a serial interface for a microprocessor running up to 10 Mega bits per second. There are registers on chip to allow the setting of the desired spindle speed via the on chip Frequency Locked Loop (F.L.L.). No external components are required in the sensor-less operation as the control functions are integrated on chip (e.g. B.E.M.F. processing, digital masking, digital delay and sequencing). The V.C.M. drivers uses a transconductance amplifier, able to provide 2 different current ranges, suitable for seeking and tracking. When a low voltage is detected, a Power On Reset (P.O.R.) is issued and the internal registers are reset, the spindle power circuitry is tri-stated, B.E.M.F. synchronous rectification is enabled, the actuator retracts and then dynamic braking of the spindle is applied. These devices are built in BICMOS technology allowing dense digital circuitry to be combined with MOS\Bipolar power devices.

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