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參數資料
| 型號： | ML4426 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | Bi-directional Sensorless BLDC Motor Controller(雙向無傳感無刷直流電機控制器) |
| 中文描述： | 雙向傳感器無刷直流電機控制器（雙向無傳感無刷直流電機控制器） |
| 文件頁數： | 1/16頁 |
| 文件大?。?/td> | 1089K |
| 代理商： | ML4426 |
CAT
17
FB A
22
FB B
23
FB C
24
BACK
EMF
SAMPLER
CRT
19
–
+
–
+
1.5V
750nA
–
+
1.5V
750nA
VDD
VDD
CRR
21
500nA
VDD
SPEED
FB
20
CVCO
15
16
RVCO
VOLTAGE
CONTROLLED
OSCILLATOR
VCO/TACH
13
2
4
3
9
10
HA
HB
HC
LA
LB
GATING
LOGIC
&
OUTPUT
DRIVERS
+
–
SPEED SET
8
5
SPEED COMP
3.9V
1.7V
20kHz
6
CT
–
+
1.4V
1
ISENSE
×
5
UVLO
12
F/
R
–
+
1.7V
VREF
26
CIOS
16k
8k
ILIMIT
1-SHOT
25
BRAKE
VDD
4k
14
VDD
28
GND
27
RREF
11
LC
REFERENCE
VCO
OUT
VCO
OUT
18
UV FAULT
7
VREF
A
B
C
D
E
F
R
COMMUTATION
STATE MACHINE
July 2000
ML4426
*
Bi-directional Sensorless BLDC Motor Controller
GENERAL DESCRIPTION
The ML4426 PWM motor controller provides all of the
functions necessary for starting and controlling the speed
of delta or wye wound Brushless DC (BLDC) motors
without Hall Effect sensors. Back EMF voltage is sensed
from the motor windings to determine the proper
commutation phase sequence using a PLL. This patented
sensing technique will commutate a wide range of 3-
Phase BLDC motors and is insensitive to PWM noise and
motor snubbing circuitry.
The ML4426 limits the motor current using a constant off-
time PWM control loop. The velocity loop is controlled
with an onboard amplifier. The ML4426 has circuitry to
ensure that there is no shoot-through in directly driven
external power MOSFETs.
The timing of the start-up sequence is determined by the
selection of three timing capacitors. This allows
optimization for a wide range of motors and loads.
FEATURES
I
Motor starts and stops with power to IC
I
Bi-directional motor drive for applications requiring forward/
reverse operation
I
On-board start sequence: Align
Ramp
Set Speed
I
Patented Back-EMF commutation technique provides jitterless
torque for minimum “spin-up” time
I
Onboard speed control loop
I
PLL used for commutation provides noise immunity from
PWM spikes, compared to noise sensitive zero crossing
technique
I
PWM control for maximum efficiency
I
Direct FET drive for 12V motors; drives high voltage motors
with IC buffers from IR, IXYS, Harris, Power Integrations,
Siliconix, etc.
(* Indicates Part Is End Of Life As Of July 1, 2000)
BLOCK DIAGRAM
(Pin Configuration Shown for 28 Pin Version)
REV. 1.0 10/10/2000
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PDF描述 |
|---|---|
| ML4428 | Sensorless Smart-Start BLDC PWM Motor Controller(無傳感智能啟動無刷直流PWM電機控制器) |
| ML4761 | Adjustable Output Low Voltage Boost Regulator(可調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、負載可分離的輸出可調升壓穩(wěn)壓器) |
| ML4770 | 2 Cell, Adjustable Output, High Current Boost Regulator with Load Disconnect(兩單元、負載可分離的可調輸出、高電流升壓穩(wěn)壓器) |
| ML4771 | High Current Boost Regulator(高電流升壓穩(wěn)壓器) |
相關代理商/技術參數 |
參數描述 |
|---|---|
| ML4426 WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| ML4426CH | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Bi-directional Sensorless BLDC Motor Controller |
| ML4426CP | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Bi-directional Sensorless BLDC Motor Controller |
| ML4426CS | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| ML4426IH | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Bi-directional Sensorless BLDC Motor Controller |
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