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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)： | 9/14頁 |
| 文件大小： | 241K |
| 代理商： | ML4411A |
ML4411/ML4411A
REV. 1.0 10/10/2000
9
BRAKING
As shown in figure 9, the braking circuit pulls the N-
Channel MOSFET gates high when BRAKE falls below a
1.4V threshold. After a power failure, C
DLY
is discharged
slowly through R
DLY
providing a delay for retract to occur
before the braking circuit is activated. The N-Channel
buffer (B1) tri-states when the BRAKE pin reaches 2.1V to
ensure that no charge from C
BRK
is lost through the pull-
down transistor in B1. To brake the motor with external
signals, first disable power by pulling pin 8 low, then pull
pin 26 below 1.4V using an open drain (or diode isolated)
output.
The bias current for the Braking circuits comes from
VCC2. When the N-Channel MOSFETs turn on, no
additional power is generated for VCC2 (motor back-EMF
rectified through out the MOSFET body diodes). After
VCC2 drops below 4V, Q2 turns off. Continued braking
relies on the C
GS
of the N-Channel MOSFETs to sustain
the MOSFET gate enhancement voltage.
0
0.01
0.02
0.03
0.04
0.05
60
50
40
30
20
10
0
T
O
C
OS
Figure 8. I
LIMIT
Output Off-Time vs. C
OS
.
P3 ONLY
–
+
VCC2
–
3V
COMM. LOGIC
DIS PWR
26
8
27
28
12
R
DLY
BRAKE
C
DLY
1.4V
–
+
A4
A6
VCC2
DIS PWR
COMMUTATION
LOGIC
UVLO
I
LIMIT
I
CMD
I
SENSE
–
+
A3
–
+
A2
A1
A
V
= 5
Q
ONE
SHOT
Q2
VCC
VCC2
7
P1 . . . P3
N1 . . . N3
R
SENSE
VIN
13
6
C
OS
C
OTA
C
BRK
B1
VCC
2.1V
–
+
A5
VCC2
VCC2
16K
POWER FAIL
4.5K
17
+5
UVLO
Q1
1K
TRI-
ST.
Figure 9. Current Control, Output Drive and Braking Circuits.
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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