M54679FP Ver la hoja de datos (PDF) - MITSUBISHI ELECTRIC

Número de pieza

componentes Descripción

Fabricante

M54679FP

2-PHASE STEPPER MOTOR DRIVER

MITSUBISHI ELECTRIC  

PRELIMINARY

Notice: This is not a final specification.

Some parametric limits are subject to change.

MITSUBISHI <CONTROL / DRIVER IC>

M54679FP

2-PHASE STEPPER MOTOR DRIVER

(6). Spike current cancellation.

Output power transistors go to ON, then the spike current

appears on the RS (current sensing) in a short time and this is

caused by the internal delay time.

M54679FP has the cancellation circuit of the spike current as

the current sensing comparators do not cause error functions.

So, the function of current sensing comparators are shut off

during 2µs since the output power transistors go to ON.

(7). Ph signal delay circuit.

M54679FP has a delay time of 3.0µs until output H-bridge

power stage go to ON since Ph signal change Low to high.

This delay time is enough short time for the frequency (plus

rate) of Ph signal and there is no problem in the normal

function.

(8). Rs and S1 or S2 terminal.

If S1 or S2 terminal (non-inverted input of the current sensing

comparators) is connected the nearest position of current

sensing resistor, the error of the current sensing by means of

wire resistance on the board will be decreased.

(9). Voltage stabilizer.

M54679FP has a voltage stabilizer of 3.5V.

The reference voltage (Vref) can connect the output (Regout)

of voltage stabilizer directly.

In this case, the current capability of the output of voltage

stabilizer is 1.0mA (source current), 0.1mA (sink current).

(10). Setting output current.

As the output circuit of M54679FP is designed by the bipolar

type NPN transistors, the current that go through the motor

coil is smaller about 15mA (typical) than the current that go

through the current sensing resistor.

This is caused by the base current of the power transistors.

Therefore, be aware this base current when the output

current is set.

(11). Power GND terminal.

Power GND is connected the anodes of flywheel diodes of

bottom side.

When the output H-bridge power stage goes to ON, as the

flyback current go through this GND terminal, minimize the

wire resistor of this GND on the board.

VM

ON

Iout

MA

OFF

RS

OFF VCC

MB

ON

Ib = 15mA (Typ.)

Iout = IRS - Ib

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