L6260 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

L6260

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

STMicroelectronics 

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.

0.8Ω 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

November 1996

BICMOS TECHNOLOGY

TQFP64

ORDERING NUMBER: L6260

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.

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