M54646AP Просмотр технического описания (PDF) - MITSUBISHI ELECTRIC

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производитель

M54646AP

2-PHASE STEPPER MOTOR DRIVER

MITSUBISHI ELECTRIC  

SWITCHING CHARACTERISTICS

SWITCHING WAVEFORM

VMA – VMB or VMB – VMA

1

tOFF=0.69 • RT • CT

1/2

tON

tOFF

td

VE

VCH

TIMING CHART

Two-phase

excitation

Phase 1

Phase 2

MITSUBISHI <CONTROL / DRIVER IC>

M54646AP

2-PHASE STEPPER MOTOR DRIVER

APPLICATION DIRECTIONS

(1) Phase input

Phase input determines output mode:

PHASE

MA

MB

H

H

L

L

L

H

(2) VR (reference voltage)

Stepless current level variation is available by continuously

changing VR.

(3) Current sensor

Compares voltage converted from amperage by current

sensing resistor to designated reference voltage level. When

they are the same, comparator triggers Mono-stable, and shuts

off output transistor during time frame tOFF. During this period,

current level decreases to slightly below reference level. When

period has passed, output transistor is reactivated. This series

of operations is repeated.

(4) Single-pulse generator

Mono-stable is triggered at comparator output phase rise edge.

Mono-stable output pulse width is determined by input to timing

terminals RT and CT, as follows:

tOFF = 0.69 × RT × CT

If new trigger occurs during tOFF, it is ignored.

(5) Analog control

Stepless output current level variation is available by

continuously changing voltage VR or feedback voltage to

comparator.

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