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參數(shù)資料
| 型號： | ML4423 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | 1, 2, or 3-Phase Variable Speed AC Motor Controller(一、二或三相可變速交流電機控制器) |
| 中文描述： | 1，2或3相交流電機調(diào)速控制器（一，二或三相可變速交流電機控制器） |
| 文件頁數(shù)： | 5/10頁 |
| 文件大?。?/td> | 235K |
| 代理商： | ML4423 |
ML4423
REV. 1.0 10/10/2000
5
FUNCTIONAL DESCRIPTION
The ML4423 generates 2 reference sinewaves separated
by 90o or 60o in a closed loop feedback system. These
sinewaves can be varied in amplitude and frequency by
the speed input. Signals across the motor windings are fed
back and the ML4423 drives the external power output
stage with the PWM sinewave signal necessary to cause
the measured (feedback) output waveform to match the
internal reference sinewaves. The ML4423 provides fixed
period, variable duty cycle current limit protection, and
a programmable dead time circuit to prevent cross
conduction in the power output stage. An undervoltage
lockout circuit turns off the external power transistors if
V
DD
falls below 9V.
CIRCUIT BLOCKS AND COMPONENT SELECTION
R
REF
R
REF
should be set to 200k
. This current along with
C
PWM
set the PWM frequency.
Speed Control
The voltage on V
SPEED
(pin 5) controls the sinewave
frequency and amplitude. A 160k
resistor to ground on
R
SPEED
(pin 6) converts the voltage on V
SPEED
to a current
which is used to control the frequency of the output PWM
sinewaves. The amplitude of the sinewaves increases
linearly with V
SPEED
until it reahces 4.4V. Above this
voltage the amplitude remains constant and only the
frequency changes as shown in Figures 1 and 2.
SINE
A
and SINE
B
Generators
The capacitor to ground on C
0
sets the frequency of the
sinewave according to the following relationship. C
0
should be a low temperature coefficient capacitor for
stable output frequency.
f
V
R
C
V
SINE
SPEED
SPEED
×
0 170
.
=
4
0
(1)
For R
SPEED
= 160k
f
V
,
C
SINE
SPEED
=
×
108 800
0
(2)
With V
SPEED
= 3V and C
0
= 0.47
μ
F, f
SINE
= 58.7Hz and
can be observed at test points SINE
A
(pin 10) and SINE
B
(pin 11).
PWM Generator
A triangular PWM frequency will be generated on a
capacitor to ground on C
PWM
(pin 13). The frequency is
set by the following equation:
f
C
PWM
PWM
=
×
1
200 000
,
(3)
For C
PWM
= 220pF, f
PWM
= 22.7kHz. It is recommended
150
120
90
60
30
0
2
4
6
8
V
SPEED
(V)
F
RSPEED = 160
C0 = 0.47
μ
F
1.25
1.00
0.75
0.50
0.25
0
2
4
4.4V
6
8
N
V
SPEED
(V)
Figure 1. Frequency vs V
SPEED
Figure 2. Normalized Output Voltage vs V
SPEED
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ML4425 | Sensorless BLDC Motor Controller |
| ML4425CP | Sensorless BLDC Motor Controller |
| ML4425CS | Sensorless BLDC Motor Controller |
| ML4425IP | Sensorless BLDC Motor Controller |
| ML4425IS | Sensorless BLDC Motor Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ML4423CP | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:1, 2, or 3-Phase Variable Speed AC Motor Controller |
| ML4423CS | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:1, 2, or 3-Phase Variable Speed AC Motor Controller |
| ML4423IP | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:1, 2, or 3-Phase Variable Speed AC Motor Controller |
| ML4423IS | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:1, 2, or 3-Phase Variable Speed AC Motor Controller |
| ML4425 | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Sensorless BLDC Motor Controller |
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