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Lista de partido
ML4435
Sensorless BLDC Motor Controller
Micro Linear Corporation
ML4435 Datasheet PDF : 14 Pages
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BLOCK DIAGRAM
PRELIMINARY
ML4435
FB A
14
FB B
15
FB C
16
5.8k
Ω
2.9k
Ω
NEUTRAL
SIMULATOR
MUX
SIGN
+
CHANGER
–
BACK
EMF SAMPLER
+
LEVEL
SHIFT
–
0.7V
0.97V
+
COMP
–
COMMUTATION
STATE MACHINE
R
SPEED FB
6
VOLTAGE
CONTROLLED
OSCILLATOR
3µs
A
POWER ON
F
B
RESET PULSE
SPEED SET
5
E
C
D
–+
SPEED
ERROR AMP
+
–
COAST
+
COMP
1.5V
–
SPEED COMP
3
ISENSE
1
SOFT START
19
8.2 + 0.7V
LEVEL SHIFT
0.7V
2.2 + 0.7V
TRIANGLE WAVE
GENERATOR
1V
225k
Ω
225k
Ω
+
COMP
–
CURRENT LIMIT
COMPARATOR
PWM
COMPARATOR
+
–
5V
GATING
LOGIC
AND
OUTPUT
DRIVERS
DQ
R
PULSE-BY-PULSE
CURRENT LIMIT
8.7V
+
–
UVLO COMPARATOR
VREF + 0.7V
6V REFERENCE
0.9V
VREF
18 SPEED FB
2 TACH
20 CVCO
4 RVCO
7
HA
8
HB
9
HC
11
LA
12
LB
13
LC
6
RT
10
VCC
17
GND
ML4435 Block Diagram
May, 2000
PRELIMINARY DATASHEET
3
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