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ML4411CS 데이터시트(PDF) 6 Page - Micro Linear Corporation

부품명 ML4411CS
상세설명  Sensorless Spindle Motor Controller
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제조업체  MICRO-LINEAR [Micro Linear Corporation]
홈페이지  http://www.microlinear.com
Logo MICRO-LINEAR - Micro Linear Corporation

ML4411CS 데이터시트(HTML) 6 Page - Micro Linear Corporation

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6
ML4411/ML4411A
Minute.
The minimum VCO gain derived from the specification
table (using the minimum Fvco at VVCO = 6V) is:
K
C
VCO MIN
VCO
()
.
=
×
242 10 6
Assuming that the VVCO(MAX) = 9.5V, then
C
F
VCO
MAX
=
××
95 242 10 6
..
or
C
POLES RPM
F
VCO =
×
460
µ
02
468
10
12
3000
2500
2000
1500
1000
500
0
0.01
µF
0.02
µF
VVCO (VOLTS)
Figure 3. VCO Output Frequency vs. VVCO (Pin 20)
Figure 4 shows the transfer function of the Phase Lock
Loop with the phase detector formed from the sampled
phase through the Gm amplifier with the loop filtered
formed by R, C1, and C2.
The impedance of the loop filter is
Zs
Cs
s
s
RC
LEAD
LAG
()
()
()
=
+
+
1
1
ω
ω
R
C1
C2
VCO
+
ZRC
RC
FOUT
KVCO(HZ/V)
Gm = 1.25 x 10–4
SAMPLED
PHASE
Figure 4. Back EMF Phase Lock Loop Components
Where the lead and lag frequencies are set by:
ωLEAD
RC
= 1
2
ωLAG
CC
RC C
=
+
12
12
START-UP SEQUENCING
When the motor is initially at rest, it is generating no
back-EMF. Because a back-EMF signal is required for
closed loop commutation, the motor must be started
“open-loop” until a velocity sufficient to generate some
back-EMF is attained (around 100 RPM). The following
steps are a typical procedure for starting a motor which is
at rest.
Step 1: The IC is held in reset (state R) with full power
applied to the windings (see figure 6). This aligns the rotor
to a position which is 30° (electrical) before the center of
the first commutation state.
Step 2: Reset is released, and a fixed current is input to
pin 21 and appears as a current on pin 20, and will ramp
the VCO input voltage, accelerating the motor at a fixed
rate.
Step 3: When the motor speed reaches about 100 RPM,
the back EMF loop can be closed by pulling pin 18 high.
RESET/
ALIGN
P1, P3, N2 ON
OPEN-LOOP
(STEPPING)
CLOSED LOOP
0
RESET
ENABLE E/A
Figure 6. Typical Start-up Sequence.
Using this technique, some reverse rotation is possible.
The maximum amount of reverse rotation is 360/N, where
N is the number of poles. For an 8 pole motor, 45° reverse
rotation is possible.
For quick recovery following a momentary power failure,
the following steps can be taken:
PIN
PIN
PIN
ILIMIT
STEP
16
18
21
ICMD
1
0
0
FIXED
IMAX
2
1
0
FIXED
IMAX
3110
IMAX
Table 2. Start-up Sequence.


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