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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)： | 12/14頁 |
| 文件大?。?/td> | 241K |
| 代理商： | ML4411A |
ML4411/ML4411A
12
REV. 1.0 10/10/2000
I
CMD
I
LIMIT
BRAKE
VCC
PH3
PH2
PH1
I
RAMP
RC
+5V
ENABLE E/A
PWR FAIL
RESET
VCO/TACH OUT
GND
P1
P2
VCC2
P3
C
OTA
C
BRK
DIS PWR
N1
N2
N3
I
SENSE
C
OS
C
VCO
0.01
1.2K
0.5
+V
+V
10K
10K
10K
+5
+12
+5
+5
+12
+
–
+12
3.3K
10K
1M
+5
+5
1M
2.2
C
DLY
+12
0.01
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
0.02
Figure 15. ML4411 Unipolar Drive Application
In unipolar operation, the motor‘s windings must be
allowed to drive freely to:
V
Φ
(MAX)
= V
SUPPLY (MAX)
+ V
EMF (MAX)
Therefore, there can be no diodes to clamp the inductive
energy to V
SUPPLY
. This energy must be clamped,
however, to avoid an over-voltage condition on the
MOSFETs and other components. Typically, a V
CLAMP
voltage is created to provide the clamping voltage. The
inductive energy may either be dissipated (Figure 16) or
alternately efficiently regenerated back to the system
supply (Figure 17).
The circuit in Figure 15 is designed to minimize the
external components necessary, at some compromise to
performance. The 3 resistors from the motor phase
windings to the PH inputs work with the ML4411‘s 8K
internal resistance to ground to divide the motor‘s
phase voltage down, providing input signals that do not
exceed 12V.
V
CLAMP
= +24V
12V
BATTERY
C1
0.1
+12V TO
VCC AND VCC2
0.1
1000
+12V
5V
REG
12V
LDO
10
0.1
+5V
Figure 16. Dissipative Clamping Technique
This circuit uses analog speed regulation. The 1M
resistor from Pin 20 to the speed regulation op amp
provides the function of injecting current into the VCO
loop filter for the open loop stepping phase of start-up
operation. The “one shot” circuitry to time the reset is
replaced by a diode and RC delay from the rising edge or
the
POWERFAIL
signal. The error amplifier is left enabled
continuously since at low speeds its current contribution
is negligible. The current injected into the loop filter must
be greater than the leakage current from the phase
detector amplifier for the motor to start reliably.
V
CLAMP
= +24V
5V
REG
12V
LDO
0.1
D1
L1
12V
BATTERY
50% DUTY
CYCLE
Figure 17. Non-Dissipative Clamping Technique
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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