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ML4411CS Datasheet(PDF) 7 Page - Micro Linear Corporation

No. de pieza ML4411CS
Descripción Electrónicos  Sensorless Spindle Motor Controller
Download  14 Pages
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Fabricante Electrónico  MICRO-LINEAR [Micro Linear Corporation]
Página de inicio  http://www.microlinear.com
Logo MICRO-LINEAR - Micro Linear Corporation

ML4411CS Datasheet(HTML) 7 Page - Micro Linear Corporation

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ML4411/ML4411A
OUTPUTS
INPUT
STATE
N1
N2
N3
P1
P2
P3
SAMPLING
R OR 0
OFF
ON
OFF
ON
OFF
ON
N/A
A
OFF
OFF
ON
ON
OFF
OFF
PH2
B
OFF
OFF
ON
OFF
ON
OFF
PH1
C
ON
OFF
OFF
OFF
ON
OFF
PH3
D
ON
OFF
OFF
OFF
OFF
ON
PH2
E
OFF
ON
OFF
OFF
OFF
ON
PH1
F
OFF
ON
OFF
ON
OFF
OFF
PH3
Table 1. Commutation States.
R
RESET
0A
B
C
D
E
F
A
4.3 V
CVCO
2.3 V
VCO OUT
STATE
Figure 5. Commutation Timing and Sequencing.
ADJUSTING OPEN LOOP STEP RATE
IRAMP should be set so that the VCO’s frequency ramp
during “open loop stepping” phase of motor starting is less
than the motor’s acceleration rate. In other words, the
motor must be able to keep up with the VCO’s ramp rate
in open loop stepping mode. The VCO’s input voltage
(VPIN 20) ramp rate is given by:
dV
dt
I
CC
VCO
RAMP
+
12
since
FK
V
VCO
VCO
VCO
K
C
VCO MAX
VCO
() =
×
410 6
then combining the 3 equations IRAMP can be calculated
from the desired maximum open loop stepping rate the
motor can follow.
I
dF
dt
CC
C
RAMP
VCO
VCO
<
×+
×
()
12
6
410
Step 1a: The IC is held in reset (state R) with ICMD low
and DIS PWR low. The Micro Processor monitors the VCO/
TACH OUT pin to determine if a signal is present. If a
signal is present, the frequency is determined (by
measuring the period). If a signal is not present, proceed
to the routine described above for starting a motor which
is a rest.
Step 2a: Release RESET and DIS PWR. Apply a current to
pin 21 and monitor the VCO/TACH OUT pin for VCO
frequency.
Step 3a: When the VCO frequency approaches 6 X the
motor frequency (or where the motor frequency has
decelerated to by coasting during the time the VCO
frequency was ramping up) the back EMF loop can be
closed by pulling pin 18 high and motor current brought
up with ICMD or ILIMIT.


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