M56785FP Просмотр технического описания (PDF) - MITSUBISHI ELECTRIC

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M56785FP

SPINDLE MOTOR DRIVER

MITSUBISHI ELECTRIC  

MITSUBISHI <CONTROL / DRIVER IC>

M56785FP

SPINDLE MOTOR DRIVER

HALL AMPLIFIER INPUT AND COMMUTATION

The relationship between the hall amplifier inputs voltage and the

motor current outputs is shown in Figure 2.

Hw+

Hv+

Hu+

Hall

inputs

V

U

W

V

Output

current

U

W

V

U

Hall elements

U

V

SOURSE

W

SINK

W

U

V

W

U

W

V

U

W

V

FORWARD

EC<ECR

Outer loator

REVERSE

EC>ECR

Figure 2.

HALL AMPLIFIER INPUT SENSITIVITY SELECT

MODE4

OPEN or HIGH

GND

120 degree

soft switching

120 degree switching

** Io current

changes sharply.

Figure 3 shows the hall amplifier input sensitivity select function. You are

able to select a sensitivity of a hall amplifier out of two levels which is

suitable for the hall elements type.

If the output minimum level of the hall elements is lower than 50mVp-p,

please connect the MODE4 pin to external GND. In this case, the

output current changes shaply. If the output minimum level of the hall

elements is higher than 50mVp-p, please make the MODE4 pin open,

then the output current is commutated softly.

We recommend that the output level of the hall elements be set between

80mVp-p and 120mVp-p, and the MODE4 pin is an open.

The hallamp

minimum input voltage

is 50 mVp-p.

The hallamp

minimum input voltage

is 35 mVp-p.

Figure 3.

SLEEP MODE FUNCTION

START / STOP ( 2 pin)

LOW or OPEN

HIGH

Motor Stop

Bias off

Hall-Bias of

Motor on

Bias on

Hall-Bias on

Figure 4 shows the sleep mode function. If the 2 pin [S/S] is set to be

open or low, the motor drive outputs have high impedance and the motor

stops. Then, the IC bias current wil be a slight current (please refer to the

electrical characteristics), and the hall bias output will be cut off. When

the 2 pin input is high, all the circuits will work.

Figure 4.

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