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參數(shù)資料
| 型號： | ML4425 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | Sensorless BLDC Motor Controller |
| 中文描述： | 傳感器無刷直流電機(jī)控制器 |
| 文件頁數(shù)： | 1/16頁 |
| 文件大?。?/td> | 167K |
| 代理商： | ML4425 |
www.fairchildsemi.com
REV. 1.0.2 7/2/01
Features
Stand-alone operation
Motor starts and stops with power to IC
On-board start sequence: Align
Patented Back-EMF commutation technique provides
jitterless torque for minimum “spin-up” time
Onboard speed control loop
PLL used for commutation provides noise immunity from
PWM spikes, compared to noise sensitive zero crossing
technique
PWM control for maximum efficiency
Direct FET drive for 12V motors; drives high voltage
motors with IC buffers
Ramp
Set Speed
General Description
The ML4425 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 ML4425 limits the motor current using a constant off-
time PWM control loop. The velocity loop is controlled with
an onboard amplifier. The ML4425 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.
Block Diagram
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
ILIMIT
–
+
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
ML4425
Sensorless BLDC Motor Controller
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ML4425CP | Sensorless BLDC Motor Controller |
| ML4425CS | Sensorless BLDC Motor Controller |
| ML4425IP | Sensorless BLDC Motor Controller |
| ML4425IS | Sensorless BLDC Motor Controller |
| ML4426 | Bi-directional Sensorless BLDC Motor Controller(雙向無傳感無刷直流電機(jī)控制器) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ML4425CH | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Sensorless BLDC Motor Controller |
| ML4425CP | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 BLDC Motor Control Sensorless RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| ML4425CS | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 BLDC Motor Control Sensorless RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| ML4425CSX | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 BLDC Motor Control Sensorless RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| ML4425IH | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Sensorless BLDC Motor Controller |
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