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ML4428CP Arkusz danych(PDF) 8 Page - Micro Linear Corporation

Numer części ML4428CP
Szczegółowy opis  Sensorless Smart-Start??BLDC PWM Motor Controller
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Producent  MICRO-LINEAR [Micro Linear Corporation]
Strona internetowa  http://www.microlinear.com
Logo MICRO-LINEAR - Micro Linear Corporation

ML4428CP Arkusz danych(HTML) 8 Page - Micro Linear Corporation

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ML4428
CVCO
As given in the section on the VCO and phase detector:
C
N RPM
VCO
MAX
=
×
×
2931 10
6
Where N is the number of poles in the motor, and RPM is
the motor’s maximum operating speed in revolutions per
minute.
CPWM
This capacitor sets the PWM ramp oscillator frequency.
This is the PWM “switching frequency”. If this value is too
low, <20kHz, then magnetostriction effects in the motor
may cause audible noise. If this frequency is too high,
>30kHz, then the switching losses in the output drivers
may become a problem. 25kHz should be a good
compromise for this value, which can be obtained by
using a 1nF capacitor.
RVCO AND RREF
RVCO should be 10k and RREF should be 120k for normal
operation.
VCO FILTER
See the section on the VCO and Phase detector for
information on these components.
VCO AND PHASE DETECTOR CALCULATIONS
The VCO should be set so that at the maximum frequency
of operation (the running speed of the motor) the VCO
control voltage will be no higher than VREF, or 6V. The
VCO maximum frequency will be:
F
N RPM
MAX
MAX
=× ×
005
.
where N is the number of poles on the motor and
RPMMAX is the maximum motor speed in Revolutions Per
Minute.
The minimum VCO gain derived from the specification
table (using the minimum FVCO at VVCO = 6V) is:
K
C
VCO MIN
VCO
()
.
=
×
2 665 10
5
Assuming that the VVCO(MAX) = 5.5V, then
C
F
VCO
MAX
=
××
5 5 2 665 10
5
..
or
C
N RPM
VCO
MAX
=
×
×
2931 10
6
Figure 4. Back-EMF Phase Locked Loop Components.
R
C1
C2
VCO
+
ZRC
RCVCO
FOUT
KVCO(Hz/sec/V)
Gm = 0.23m
SAMPLED
PHASE
BEMF
SAMPLER
ROTOR
PHASE
A/RADIAN
gm = 0.23mA/V
Ke
× ω × Atten
2
× π
PHASE DETECTOR
(R
× C2 × s + 1)
s
× (C2 + R × C1 × s × C2 + C1)
LOOP FILTER
2.665
× 10–5
CVCO × s
× 2 × π
VCO
RADIAN/sec/V
V/A


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