ML4425IS 반도체 회로 부품 판매점
Sensorless BLDC Motor Controller
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 Micro Linear |
July 2000
ML4425
Sensorless BLDC Motor Controller
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.
FEATURES
s Stand-alone operation
s Motor starts and stops with power to IC
s On-board start sequence: Align ® Ramp ® Set Speed
s Patented Back-EMF commutation technique provides
jitterless torque for minimum “spin-up” time
s Onboard speed control loop
s PLL used for commutation provides noise immunity
from PWM spikes, compared to noise sensitive zero
crossing technique
s PWM control for maximum efficiency
s Direct FET drive for 12V motors; drives high voltage
motors with IC buffers from IR, IXYS, Harris, Power
Integrations, Siliconix, etc.
BLOCK DIAGRAM (Pin Configuration Shown for 28 Pin Version)
FB A
22
FB B
23
FB C
24
17
VDD CAT
750nA
1.5V
–
+
BACK
EMF
SAMPLER
19
VDD
CRT
750nA
–
1.5V
+
21
CRR
20 15
SPEED CVCO
FB
16
RVCO
VDD
500nA
VOLTAGE
CONTROLLED
OSCILLATOR
VCO/TACH
13
VCO
OUT
8
SPEED SET
+
–
3.9V
5
SPEED COMP
CT
6
1.7V
ISENSE
1
ILIMIT
12
20kHz
1.7V
VCO
OUT
–
+
×5
VREF
16kΩ
–
+
R
A
FB
EC
D
ILIMIT
1-SHOT
8kΩ
CIOS
26
COMMUTATION
STATE MACHINE
1.4V
VDD
–
+
4kΩ
UVLO
GATING
LOGIC
&
OUTPUT
DRIVERS
HA
2
HB
3
HC
4
LA
9
LB
10
LC
11
UV FAULT
18
REFERENCE
BRAKE
25
VDD
GND
RREF
VREF
14
28 27
7
1
ML4425
PIN CONFIGURATION
ML4425
28-Pin Narrow PDIP (P28N)
28-Pin SOIC (S28)
ISENSE 1
HA 2
HB 3
HC 4
SPEED COMP 5
CT 6
VREF 7
SPEED SET 8
LA 9
LB 10
LC 11
ILIMIT 12
VCO/TACH 13
VDD 14
28 GND
27 RREF
26 CIOS
25 BRAKE
24 FB C
23 FB B
22 FB A
21 CRR
20 SPEED FB
19 CRT
18 UV FAULT
17 CAT
16 RVCO
15 CVCO
TOP VIEW
ML4425
32-Pin TQFP (H32-7)
H3
NC
SPEED COMP
CT
VREF
SPEED SET
LA
LB
32 31 30 29 28 27 26 25
1 24
2 23
3 22
4 21
5 20
6 19
7 18
8 17
9 10 11 12 13 14 15 16
FB C
FB B
FB A
CRR
SPEED FB
CRT
UV FAULT
CAT
TOP VIEW
2
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PDF 파일 내의 페이지 : 총 16 페이지
제조업체: Micro Linear
( ml )
ML4425IS sensor
데이터시트 다운로드 :
[ ML4425IS.PDF ]
[ ML4425IS 다른 제조사 검색 ]
국내 전력반도체 판매점
상호 : 아이지 인터내셔날
전화번호 : 051-319-2877
[ 홈페이지 ]
IGBT, TR 모듈, SCR, 다이오드모듈, 각종 전력 휴즈
( IYXS, Powerex, Toshiba, Fuji, Bussmann, Eaton )
전력반도체 문의 : 010-3582-2743
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