5v Hard Disk Drive Power ComboThe L6245 contains in a single chip all the func-
tions to operate a sensorless brushless (DC) mo-
tor and a voice coil motor, suitable for hard disk
drive applications.
The device is configured to Interface directly to
an 8 bit parallel Microprocessor bus, and has a
Register based architecture to reduce number of
interconnection lines. All the positioning loop for
sensorless spindle is integrated, including BEMF
sensing, digital masking, digital delay and se-
quencing. All Timing function are performed digi-
tally, thus no external filtering components are re-
quired.
The VCM driver is a transconductance Amplifier
able to provide 2 different current ranges, suitable
for seeking or tracking of the head actuator.
When a low voltage is detected, a monitor, in se-
quence, resets the internal Registers puts in tris-
tate the spindle powers, retracts the actuator, and
applies the dynamic brake of the spindle.
The L6245 is realized in Multipower-BCD 2 tech-
nology, which combine isolate DMOS power tran-
sistors with CMOS and Bipolar circuits in the
same monolithic layer, and is assembled in a 64-
pin PQFP. By STMicroelectronics
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L6245 Pb-Free | L6245 Cross Reference | L6245 Schematic | L6245 Distributor |
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