L6260 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'L6260' PDF : 30 Pages View PDF
L6260
Figure 9.
Counter value
FLL Course
register value
Course counter
counting down
FLL Fine
register value
Fine counter
counting down
Zero crossing
expected here
Course counter
counting down
Fine counter
counting down
Desired period
between zero crossings
e.g. Actual
zero crossing
”Previous” zero
crossing
e.g. Actual
zero crossing
Actual error between expected zero crossing
and actual zero crossing. This value is fed into
the charge pump to either speed up or slow down the rotation.
Time
D94IN098
Figure 10.
SYSTEM
STATUS
(REG 0)
MECH CYCLE
ELEC CYCLE
BEMF CYCLE
MASK
DELAY
SPIN
CONTROL
12
(REG 2)
SPIN ENABLE
RESET
INC STATE
RUN/SEARCH
SYSTEM
CONTROL
(REG 3)
SPIN GAIN
8/12 POLE
BRAKE/BI/TRI
ELEC/MECH
SPEED CONTROL
CONTROL
LOGIC
HIGH
SIDE
PREDRIVER
BEMF
DETECT
LOW
SIDE
PREDRIVER
N-MOS
FLL SATURATION
FLL UP FREQUENCY
+
LOCKED
FLL DOWN
LOOP
-
FLL FINE
(REG 5)
FLL COURSE
(REG 4)
I SENSE
D94IN099
A Synthetic Hall output is also provided from this
chip once per electrical or BEMF crossing.
Using the remote current sensing of the Spin-
dle current
The remote current sensing allows the connection
of the power drivers directly to ground. The bene-
22/30
fit here is the elimination of the external sense re-
sistor.
Under normal operation there is a 500:1 differ-
ence between the current seen on the sense pin
and the current in the spindle power drivers. At
start up this ratio is changed to 2500:1 (five time
the normal operation). The recommended voltage
at the sense pin is approximately one volt.
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