M54646AP

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

Switching Characteristics

Switching Waveform

1

1/2

VE

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) V

Stepless current level variation is available by continuously changing V

(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 t

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 R

t