APPLICATION NOTES CONTINUED
COMMUTATION TRUTH TABLE
HALL SENSOR PHASING
120°
ICOMMAND = POS.
ICOMMAND = NEG.
60°
BRAKE
HALL HALL HALL HALL HALL HALL
AØ
BØ
CØ
AØ
BØ
CØ
A
B
C
A
B
C
1
0
0
1
0
0
H
-
-
H
H
-
L
L
-
L
-
-
L
L
-
H
H
-
0
0
0
0
0
0
0
0
1
1
0
0
0
1
1
0
X
1
1
1
0
0
1
0
X
0
0
1
1
1
1
0
X
1
1
0
0
0
1
0
X
1
1
1
0
0
0
1
X
0
1
1
1
0
1
0
X
L
L
-
H
H
-
H
H
-
L
L
-
L
L
-
H
H
-
H
-
L
-
-
-
-
-
-
-
-
-
L
L
L
L
L
L
1
0
X
= High Level
= Low Level
= Don't Care
H
L
-
= SOURCE
= SINK
= OPEN
NOTE: Because of the true 4 quadrant method of output switching,
the output switches will PWM between the ICOMMAND POSITIVE
and ICOMMAND NEGATIVE states, with the average percentage
based on ICOMMAND being a positive voltage and a negative
voltage. With a zero voltage ICOMMAND, the output switches will
modulate with exactly a 50% duty cycle between the
ICOMMAND POSITIVE and ICOMMAND NEGATIVE states.
Rev. E 2/05
4
MSK [ M.S. KENNEDY CORPORATION ]
