L6238S Datasheet, PDF (1/31 Pages) STMicroelectronics – 12V SENSORLESS SPINDLE MOTOR CONTROLLER

L6238S
12V SENSORLESS SPINDLE MOTOR CONTROLLER
PRODUCT PREVIEW
12V OPERATION
3A, THREE-PHASE DMOS OUTPUT
(TOTAL R_dson 0.52Ω)
NO HALL SENSORS REQUIRED
DIGITAL BEMF PROCESSING
LINEAR OR PWM CONTROL
STAND ALONE OR EXT. DRIVER
SHOOT-THROUGH PROTECTION
THERMAL SHUTDOWN
PLCC44
PQFP44
DESCRIPTION
The L6238S is a Three-Phase, D.C. Brushless
Spindle Motor Driver system. This device features
both the Power and Sequence Sections.
Higher Power Applications can be activied with
the addition of an external Linear Driver, or by op-
erating the Internal Drivers in PWM.
Motor Start-Up, without the use of Hall Sensors,
can be achieved either by an internal start-up al-
gorithm or by manually sequencing the Output
Drivers, using a variety of User-Defined Start-UP
Algorithms.
BLOCK DIAGRAM
TQF P64
ORDERING NUMBERS: L6238S (PLCC44)
L6238SQA (PQFP44)
L6238SQT (TQFP64)
Protection features include Stuck Rotor\Backward
Rotation Detection and Automatic Thermal Shut-
down.
VANALOG
SYS CLOCK
SEQ INCR
MONO/SEQ
CTRL
TDLY(0)
TDLY(1)
TDLY(2)
MASK DLY
SPIN
SENSE
OT-WARN
VL
BIAS
SYSTEM
CLOCK
FALIGN
OUTPUT
ENABLE
RUN/ PWM/ PWM PWM PWM
BRAKE SLEW LIN COMP TIM
ALIGN + GO
START-UP
ONE-SHOT
SLEW-CTRL
CHARGE
PUMP
POWER
STAGE
DIGITAL
DELAY
MONO
DET
SEQUENCER
ZERO
CROSSING
DETECTOR
+
BEMF ⁺
SENSE ₊
-
TOGGLE
THERMAL
SHUTDOWM
DIVIDE
BY N
+
-
DRV
CNTL
AV=4V/V
CSA
SEL POL
FMTR VCTRL GM COMP GATE DRIVE
D95IN232
CPUMP1
CPUMP2
CPUMP3
VPOWER
BRAKE
DELAY
OUT A
OUT B
OUT C
CTR TAP
RSENSE1
RSENSE2
GND
CSA INPUT
October 1995
1/31
This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.