M54640P Просмотр технического описания (PDF) - Renesas Electronics

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производитель

M54640P

Stepper Motor Driver

Renesas Electronics 

M54640P

Application Description

• PHASE INPUT

Phase input decides the output mode.

Phase

MA

MB

H

H

L

L

L

H

• I0, I1

I0 and I1 fixed based on the comparison voltage VR decide the output current level.

The current level can be continuously changed by changing the voltage at VR continuously.

I0

I1

Current level

H

H

0

L

H

Low

H

L

Average

L

L

High

• Current sensor

When the voltage fall at the current sensing resistor and the selected current level becomes of the same level, the

comparator triggers the monostable. Then, the output stage is cut off for a certain time (tOFF). During this cutoff time,

the current volume decreases slightly and falls short of the comparison level.

After the cutoff time (tOFF), the output stage is in ON state again.

This operation is repeated.

• Single pulse generator

At the comparator output rise edge, the monostable is triggered.

The pulse width of the monostable at the external timing Rt and Ct is as follows.

tOFF = 0.69 x RtCt

Retrigger during tOFF is neglected.

• Analog control

The output current level can be continuously changed by changing the voltage at VR or the feedback voltage to the

comparator.

Rev.1.0, Sep.19.2003, page 5 of 9

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