M56784 데이터 시트보기 (PDF) - MITSUBISHI ELECTRIC

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M56784

SPINDLE MOTOR DRIVER

MITSUBISHI ELECTRIC  

MITSUBISHI <CONTROL / DRIVER IC>

M56784FP

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.

Hall

inputs

Output

current

Hw+

Hv+

Hu+

V

U

W

V

Hall elements

U

V

W

SOURSE

U

V

W

V

W

U

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

changes sharply.

The hall amp

minimum input

voltage is

50mVp-p.

The hall amp

minimum input

voltage is

35mVp-p.

Figure 3.

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.

SLEEP MODE FUNCTION

START / STOP ( 41 pin)

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 41 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 will be a slight current

(please refer to the electrical characteristics), and the hall bias

output will be cut off. When the 41 pin input is high, all the circuits

will work.

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