M54676E データシートの表示（PDF） - MITSUBISHI ELECTRIC

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M54676E

2-PHASE STEPPER MOTOR DRIVER

MITSUBISHI ELECTRIC  

MITSUBISHI <CONTROL / DRIVER IC>

M54676P

2-PHASE STEPPER MOTOR DRIVER

PRECAUTIONS FOR USE

Sequence of supply voltage (VM and Vcc5) and logic

input voltage

The VM voltage should be the maximum voltage among all volt-

ages applied to this IC. If no voltage is applied to VM and 5V

voltage is applied to Vcc5 pin and logic input pin, leak current flows

from Vcc5 pin and logic input pin to VM through a surge protection

diode.

Wiring on the board

Current is controlled by flowing output current to the current

sensing resistor (1 ohmlevel) to measure the voltage fall.

The output current performs the chopping operation at high speed.

Therefore, wiring to flow current and to connect the high-

impedance input pin (Vref) should be conducted carefully not to

cause a cross talk.

VM

12V

12V

0V

(Open)

Vcc5

5V

0V

(Open)

5V

Logic

input

Mode

5V,0V Normal operation mode

5V,0V

Standby mode (No current flows to

logic input pin and Vcc pin.)

5V,0V

Leak current flows

from Vcc5 pin and

logic input pin to

Prohibited

VM pin.

Sequence

After the VM voltage rises, set the Vcc5 power supply voltage and

logic input voltage. Similarly, after Vcc5 supply voltage and logic

input voltage rise, raise the VM supply voltage.

Time

VM

Vcc5

and

logic input

Thermal shutdown function

The circuit board on which this IC is mounted is designed to realize

low impedance between power supply and output pin. Therefore, it

is desirable to take a safe measure such as fixing a fuse to avoid

such a situation that the board is damaged by a fire when output

pin is internally short-circuited by excessive surge voltage applied

externally by accident (or when the TSD function is damaged).

Thermal loss

In case that conditions for use (regarding supply voltage and

output current) or a board used is changed, sufficient thermal

evaluation should be conducted and design should be worked out

to leave a margin for thermal loss. The higher the chopping

frequency is, the larger switching loss within the IC becomes.

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