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參數(shù)資料
| 型號： | ML4411A |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | Sensorless Spindle Motor Controller(無傳感器主軸電機控制器) |
| 中文描述： | 傳感器主軸電機控制器（無傳感器主軸電機控制器） |
| 文件頁數(shù)： | 11/14頁 |
| 文件大?。?/td> | 241K |
| 代理商： | ML4411A |
ML4411/ML4411A
REV. 1.0 10/10/2000
11
+5V
D1
TO ML4411
PIN 16
R2
R1
IC1
IC1
IC1
TO ML4411
PIN 18
D2
C2
1/6
1/6
1/6
ML4411
PIN 17
C1
Figure 11. Analog Start-up Circuit
TO ML4411
PIN 28
R3
–
+
A1
–
+
A1
C3
R4
+12V
R5
R6
TO ML4411
PIN 20
SYMBOL
A1
IC1
D1, D2
R1
R2
R3
VALUE
LM358
74HC14
IN4148
1M
1M
100K
SYMBOL
R4
R5
R6
C1
C2
C3
VALUE
100K
50K
50K
3.3
μ
F
3.3
μ
F
0.47
μ
F
Figure 12. Analog Speed Control
In Condition 2 above, the P-Channel MOSFET is pulled up
inside the ML4411 with a 16K
resistor. If the current
through C(CGp) is greater than V
TH
÷
16K when the
N-FET turns on, the P-FET could turn on simultaneously,
causing cross-conduction. Adding R1 as shown in Figure
14 eliminates this. The size of R1 will depend on the fall
time of the phase voltage, and the size of the C(DGp). D1
may be needed for high power applications to limit the
negative current pulled (through C(DGn)) out of the
substrate diode in the ML4411 when P-FET turns off.
P
N
D1
C(DGn)
C(DGp)
RG(P)
RG(N)
R1
VCC2
Figure 14. Causes of Cross-conduction
Adding a series damping resistor to the N-FET gate (RGn)
will slow the fall time. The damping resistor should be
low enough to:
Avoid turning on the N-Channel gate when the PNP
turns on via the same mechanism outlined in condition
2 above
Not severely increase the switching losses in the N-FET
UNIPOLAR OPERATION
Unipolar mode offers the potential advantage of lower
motor drive cost by only requiring the use of 3 transistors
to drive the motor. The ML4411 will operate in unipolar
mode (Figure 15) provided the following precautions are
taken:
1.
The IC supplies should not exceed 12V + 10%.
2.
The phase pins on the IC should not exceed the
supply voltage.
VCC2
1K
P
5
4
INHIBIT N3
Q2
+
–
A6
ML4411A ONLY
P3
16K
Figure 13. Alternate cross-conduction prevention for
ML4411A
1. When transitioning from mode 0 to mode A (see table
1) P3 goes from on to off at the same time N3 goes
from off to on. If the P3 turns off slowly and N3 turns
on quickly, cross-conduction may occur. This condition
has been prevented inside the IC on the ML4411A
through the addition of comparator A6 on the P3
output (Figure 9). This comparator may cause an
oscillation when the N3 switches on due to the
capacitive coupling effect described below pulling the
P3 pin below VCC2-1.4V. To avoid this, use the circuit
in Figure 13.
2. When the MOSFET in the same phase switches on gate
current flows due to capacitive coupling of current
through the MOSFET’s drain to gate capacitance. This
could cause the device that was off to be turned on.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ML4411 | Sensorless Spindle Motor Controller(無傳感器主軸電機控制器) |
| ML4423 | 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) |
| ML4425 | Sensorless BLDC Motor Controller |
| ML4425CP | Sensorless BLDC Motor Controller |
| ML4425CS | Sensorless BLDC Motor Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ML4411ACS | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| ML4411CS | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Sensorless Spindle Motor Controller |
| ML44126N | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:FOR OPTICAL INFORMATION SYSTEMS |
| ML44126R | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:FOR OPTICAL INFORMATION SYSTEMS |
| ML4420 | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:ENHANCED SENSORLESS BLDC MOTOR CONTROLLER |
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