M56755AFP データシートの表示（PDF） - MITSUBISHI ELECTRIC
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M56755AFP Datasheet PDF : 10 Pages
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HALL AMPLIFIER INPUT AND COMMUTATION
The relationship between the hall amplifier inputs voltage and the
motor current outputs is as shown in Figure 2.
MITSUBISHI <CONTROL / DRIVER IC>
M56755AFP
SPINDLE MOTOR DRIVER
Hall
inputs
Output
current
Hw+
Hv+
Hu+
V
U
W
V
Hall elements
U
V
W
SOURSE
U
V
W
U
W
V
U
W
V
U
W
V
SINK
U
W
FORWARD
EC < ECR
Figure 2.
Outer loator
REVERSE
EC > ECR
HALL AMPLIFIER INPUT SENSITIVITY SELECT
MODE4
OPEN or HIGH
GND
120 degree
soft switching
120 degree switching
** Io current
will be shape.
The hall amp
input voltage
minimum is
50mVp-p.
The hall amp
input voltage
minimum is
35mVp-p.
Figure 3.
Figure 3 shows the hall amplifier input sensitivity select function.
An user is able to select the sensitivity of a hall amplifier to match
with the hall elements type.
If the output minimum level of a hall elements is a low level as
below 50mVp-p, please connect the MODE4 to GND at external.
In this case, the output current will be shape. If the output minimum
level of a hall elements is more higher than 50mVp-p, please make
the MODE4 to open, then the output current will be commutated
softly.
We recommend that the output level of a hall element is used for
80mVp-p to 120mVp-p and the MODE4 is made to open.
SLEEP MODE FUNCTION
START / STOP
LOW or OPEN
HIGH
Motor Stop
Bias off
Hall-Bias off
Motor on
Bias on
Hall-Bias on
Figure 4.
Figure 4 shows the sleep mode function. If the 1 pin [S/S] is set to
open or low, the current output will be high impedance and then
the motor will be stop. Also, the IC bias current wil be a slight
current (please make reference the electrical characteristics). At
the same time, the hall bias output will be cut off. When the 1 pin
goes high, the all of circuits will be available.
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