M56755FP 데이터 시트보기 (PDF) - MITSUBISHI ELECTRIC

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M56755FP

SPINDLE MOTOR DRIVER

MITSUBISHI ELECTRIC  

MITSUBISHI <CONTROL / DRIVER IC>

M56755FP

SPINDLE MOTOR DRIVER

HALL AMPLIFIER INPUT AND COMMUTATION

The relationship between the hall amplifier inputs voltage and the motor current outputs is as shown in Figure 2.

Hall

inputs

Output

current

Figure 2.

Hw+ Hv+

Hu+

V

U

W

V

U

W

V

U

Hall elements

U

V

W

SOURSE

U

V

W

U

W

V

U

W

V

Outer loator

REVERSE

EC>ECR

SINK

W

FORWARD

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.

Figure 3.

The hall amp

input voltage

minimum is

35mVp-p.

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 1pin

[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 1pin

goes high, the all of circuits will be available.

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