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L6260 Datasheet(PDF) 1 Page - STMicroelectronics |
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L6260 Datasheet(HTML) 1 Page - STMicroelectronics |
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1 / 30 page  L6260 4.5 – 5.5V DISK DRIVER SPINDLE & VCM, POWER & CONTROL COMBO’S GENERAL 5V OPERATION. *REGISTER BASED ARCHI- TECTURE 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 SPIN- DLE DACs HIGH BANDWIDTH SPEED REGULATION LOOP (ONCE PER MECH\ELEC CYCLE AC- CURACY) 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 RE- DUCED E.M.I. 0.8 Ω 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 THERMAL & CURRENT PROTECTION DESCRIPTION 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 micro- processor 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 Fre- quency Locked Loop (F.L.L.). No external compo- nents 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 am- plifier, able to provide 2 different current ranges, suitable for seeking and tracking. When a low voltage is detected, a Power On Re- set (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 al- lowing dense digital circuitry to be combined with MOS\Bipolar power devices. November 1996 TQFP64 ORDERING NUMBER: L6260 BICMOS TECHNOLOGY 1/30 |
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