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參數(shù)資料
| 型號(hào)： | ML4428 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | Sensorless Smart-Start BLDC PWM Motor Controller(無傳感智能啟動(dòng)無刷直流PWM電機(jī)控制器) |
| 中文描述： | 智能傳感器啟動(dòng)無刷電機(jī)控制器的PWM（無傳感智能啟動(dòng)無刷直流脈寬調(diào)制電機(jī)控制器） |
| 文件頁數(shù)： | 8/16頁 |
| 文件大小： | 151K |
| 代理商： | ML4428 |
ML4428
8
REV. 1.0 11/17/2000
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
R
VCO
should be 10k and R
REF
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 V
REF
, or 6V. The
VCO maximum frequency will be:
F
N RPM
MAX
MAX
=
×
0 05
.
where N is the number of poles on the motor and
RPM
MAX
is the maximum motor speed in Revolutions Per
Minute.
The minimum VCO gain derived from the specification
table (using the minimum F
VCO
at V
VCO
= 6V) is:
K
C
VCO MIN
(
VCO
)
.
=
2 665 10
5
Assuming that the V
VCO(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
–
+
Z
RC
RC
VCO
F
OUT
K
VCO
(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
C
VCO
×
s
×
2
× π
VCO
RADIAN/sec/V
V/A
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| ML4428直流電機(jī)控制芯片 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
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