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STMicroelectronics Electronic Components Datasheet

L6254 Datasheet

12V DISK DRIVE SPINDLE & VCM/ POWER & CONTROL COMBO

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L6254 pdf
® L6254
12V DISK DRIVE SPINDLE & VCM, POWER
& CONTROL “COMBO”
PRODUCT PREVIEW
GENERAL
12V (±10%) OPERATION.
REGISTER BASED ARCHITECTURE
MINIMUM EXTERNAL COMPONENTS
BICMOS + VERTICAL DMOS (1.5mm)
BICMOS TECHNOLOGY
VCM DRIVER
1.5A DRIVE CAPABILITY
0.9W TOTAL BRIDGE IMPEDANCE AT 25°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
4 PROGRAMMABLE PARKING VOLTAGE
DYNAMIC BRAKE
TQFP44 (10x10mm)
ORDERING NUMBER: L6254
SLUG FOR POWER DISSIPATION
THERMAL SHUTDOWN AND PRETHERMAL
WARNING
SPINDLE DRIVER
2.0A DRIVE CAPABILITY
0.8W TOTAL BRIDGE IMPEDANCE AT 25°C
BEMF, INTERNAL OR EXTERNAL, PROC-
ESSING
SENSOR-LESS MOTOR COMMUTATION
PROGRAMMABLE COMMUTATION PHASE
DELAY
LINEAR MODE AND CONSTANT TOFF PWM
OPERATION MODE
INTERNAL FREQUENCY LOCKED LOOP
SPEED CONTROL (FLL)
BEMF RECTIFICATION DURING RETRACT
BUILT-IN ALIGNAMENT&GO START-UP
INDUCTIVE SENSING START UP OPTION
RESYNCHRONIZATION
DYNAMIC & REVERSE BRAKE
CONTROLLABLE OUTPUT SLEW RATE
OTHER FUNCTIONS
12V AND 5V MONITORING WITH EXTERNAL
SET TRIP POINTS AND HYSTERESIS
POWER UP/DOWN SEQUENCING
LOW VOLTAGE SENSE
DESCRIPTION
The L6254 integrates into a single chip both spin-
dle and VCM controllers as well as power stages.
The device is designed for 12V disk drive applica-
tion requiring up to 2.0A of spindle and 1.5A of
VCM peak currents.
A serial port with up to 25 MHz capability provides
easy interface to the microprocessor. A register
controlled Frequency Locked Loop (FLL) allows
flexibility in setting the spindle speed. Integrated
BEMF processing, digital masking, digital delay,
and sequencing minimize the number of external
components required.
Power On Reset (POR) circuitry is included. Upon
detection of a low voltage condition, POR is as-
serted, the internal registers are reset, and spin-
dle power circuitry is tri-stated. The BEMF is recti-
fied providing power for actuator retraction
followed by dynamic spindle braking.
The device is built in BICMOS technology allow-
ing dense digital/analog circuitry to be combined
with a high power DMOS output stage.
April 1999
This is preliminary information on a new product now in development. Details are subject to change without notice.
1/17


STMicroelectronics Electronic Components Datasheet

L6254 Datasheet

12V DISK DRIVE SPINDLE & VCM/ POWER & CONTROL COMBO

No Preview Available !

L6254 pdf
L6254
BLOCK DIAGRAM
CS
SW1
SDATA
SCLK
SDEN
TR_12V
TR_5V
CHARGE
PUMP
FREQUENCY
LOCK LOOP
SPINDLE SEQUENCER
ISO
DRIVER
SERIAL
INTERFACE
START-UP
REGISTERS
BEMF
PROCESSING
RE_SYNC
DYNAMIC/
REVERSE
BRAKE
VCM CURRENT
CONTROL PSM/LIN
ZERO CROSS
DETECTION
SPINDLE
CURRENT
CONTROL
PWM/LIN
PARKING
VCM
CALIBRATION
BEMF
RECTIFICATION
SUPPLY
FAULT
MONITORS
THERMAL
SUPPLY
14 BIT
VCM DAC
REFERENCE
VOLTAGE
GENERATOR
+
-
A OUT_A
CTAP
B OUT_B
RSENSE
C OUT_C
ISENSE
A+
A-
-
A=4
+
VCM_A+
VCC
VCM_A-
VCM_GND
SENSE_IN-
SENSE_IN+
D99IN1042
PIN CONNECTION
2/17
FCOM
CTAP
PWM/SLEW
OUT_C
I_SENSE
R_SENSE
OUT_B
GND
R_SENSE
OUT_A
INDEX
44 43 42 41 40 39 38 37 36 35 34
1 33
2 32
3 31
4 30
5 29
6 28
7 27
8 26
9 25
10 24
11 23
12 13 14 15 16 17 18 19 20 21 22
SW1
FLL_RES
VCC
VCM_A+
SENSE_IN-
VCM_GND
SENSE_IN+
VCM_A-
VCC
CS
CP
D98IN847


Part Number L6254
Description 12V DISK DRIVE SPINDLE & VCM/ POWER & CONTROL COMBO
Maker STMicroelectronics
Total Page 17 Pages
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