- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄377969 > ML4428 (Fairchild Semiconductor Corporation) Sensorless Smart-Start BLDC PWM Motor Controller(無傳感智能啟動無刷直流PWM電機控制器) PDF資料下載
參數(shù)資料
| 型號： | ML4428 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | Sensorless Smart-Start BLDC PWM Motor Controller(無傳感智能啟動無刷直流PWM電機控制器) |
| 中文描述： | 智能傳感器啟動無刷電機控制器的PWM（無傳感智能啟動無刷直流脈寬調(diào)制電機控制器） |
| 文件頁數(shù)： | 10/16頁 |
| 文件大?。?/td> | 151K |
| 代理商： | ML4428 |
ML4428
10
REV. 1.0 11/17/2000
CSNS
A capacitor to ground at this pin sets the ON time of the 6
current sense pulses used for position detection at start-up
and at low speeds. The ON time is set by:
T
ON
= C
SNS
(35.7k)
Referring to Figure 5, each of the 6 current sense pulses is
governed by a rise time with a time constant of L/R where
L is the inductance of the motor network with 2 windings
shorted and R is the total resistance in series with the motor
between the supply rails. R includes the ON-resistance of
the power-FETs and R
SNS
. The R
DSON
of the high side FET
should match that of the low side FET. L is a function of
rotor position. Each pulse will have a peak value
V
SENSEPEAK
of
V
R
V
R
SENSEPEAK
SNS
MOTOR
T
L R
/
e
ON
=
1
where
R
R
(
R
R
L
L
L L
SDON
SENSE
L L
=
×
+
×
)
+
=
×
0 75
.
2
0 75
.
What is important for sensing rotor position is the
amplitude difference between each of the three pairs of
current sense pulses. This can be seen by triggering on
I
SNS
on an oscilloscope with the RC
VCO
pin shorted to
ground. One should see the current waveform of Figure 5.
Allowing the peak current sense pulse to reach an
amplitude of 0.5V (by adjusting C
SNS
, and hence T
ON
) or,
allowing the difference between the maximum and
minimum of the 6 pulses to be >50mV, should suffice for
adequate rotor position sensing. A good starting value for
T
ON
is 200μs, requiring C
SNS
= 5.6nF.
RINIT
The initial time interval between sample pulses during
start-up is set by R
INIT
. This time interval (t
INIT
) occurs
while the RC
VCO
pin is less than 0.25 volts.
R
t
C
INIT
INIT
VCO
=
3 43
.
A
B
C
D
E
F
A
3.75V
C
VCO
2.0V
VCO OUT
Figure 6. Commutation Timing and Sequencing.
Direction
Outputs
Input Samples
State
Reverse
N3
N2
N1
P3
P2
P1
Forward
N1
N2
N3
P1
P2
P3
Forward
Reverse
A
OFF
OFF
ON
ON
OFF
OFF
PH2
PH2
B
OFF
OFF
ON
OFF
ON
OFF
PH1
PH3
C
ON
OFF
OFF
OFF
ON
OFF
PH3
PH1
D
ON
OFF
OFF
OFF
OFF
ON
PH2
PH2
E
OFF
ON
OFF
OFF
OFF
ON
PH1
PH3
F
OFF
ON
OFF
ON
OFF
OFF
PH3
PH1
Table 1. Commutation States.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ML4761 | Adjustable Output Low Voltage Boost Regulator(可調(diào)輸出低壓差的升壓穩(wěn)壓器) |
| ML4769 | 2 Cell, Adjustable Output Boost Regulator with Load Disconnect(兩單元、負(fù)載可分離的輸出可調(diào)升壓穩(wěn)壓器) |
| ML4770 | 2 Cell, Adjustable Output, High Current Boost Regulator with Load Disconnect(兩單元、負(fù)載可分離的可調(diào)輸出、高電流升壓穩(wěn)壓器) |
| ML4771 | High Current Boost Regulator(高電流升壓穩(wěn)壓器) |
| ML4790 | Adjustable Output, Low Ripple Boost Regulator(輸出可調(diào)、小波紋升壓穩(wěn)壓器) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ML4428CP | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Sensorless Smart-Start⑩ BLDC PWM Motor Controller |
| ML4428CS | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Sensorless Smart-Start⑩ BLDC PWM Motor Controller |
| ML4428IP | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Sensorless Smart-Start⑩ BLDC PWM Motor Controller |
| ML4428IS | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Sensorless Smart-Start⑩ BLDC PWM Motor Controller |
| ML4428直流電機控制芯片 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。