L7203 Datasheet, PDF (1/13 Pages) STMicroelectronics – SMOOTH DRIVE SPINDLE MOTOR FOR OPTICAL DRIVE APPLICATION WITH POWER INTEGRATED

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L7203
SMOOTH DRIVE SPINDLE MOTOR FOR OPTICAL DRIVE
APPLICATION WITH POWER INTEGRATED
SMOOTH DRIVE™ SYSTEM
1.8A DRIVE PEAK CAPABILITY
SLEW RATE CONTROL
INDUCTIVE SENSE START-UP ROUTINE
THERMAL SHUTDOWN
SUITABLE FOR 5V AND 12V APPLICATION
ONLY ONE HALL SENSOR IS REQUIRED
DESCRIPTION
The L7203 SPINDLE MOTOR IC includes a three
phase brushless spindle motor controller and the
power stage in switching mode. The device is de-
signed for both 5V and 12V OPTICAL DRIVE ap-
plication requiring up to 1.8A peak of current.
The device is realized in BCD5, a 0.7 µm Mixed
technology.
The spindle motor position detection is carried
out by means of a single comparator with hyster-
esis. In the start-up phase the "inductive sense
BLOCK DIAGRAM
SO20
SSO24
ORDERING NUMBERS: L7203 (SO20)
L7203S (SSO24)
start up method" is used to detect the rotor posi-
tion, determining the direction of starting rotation.
This procedure is implemented by a logic circuit
on chip.
The device applies three sinusoidal voltages to
the motor coils.
This is obtained through the application of the
April 2001
PRS
LOW VOLTAGE
DETECTOR
SRC
AGND
DGND
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