M54646AP Просмотр технического описания (PDF) - Renesas Electronics

Номер в каталоге

Компоненты Описание

производитель

M54646AP

2-Phase Stepper Motor Driver

Renesas Electronics 

M54646AP

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

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

Rev.1.0, Sep.19.2003, page 4 of 8

Share Link: