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© 1998 IXYS All rights reserved

High Performance Dual PWM Microstepping Controller

Type

Package

Temperature Range

IXMS150 PSI

24-Pin Skinny DIP

-40°C to +85°C

The IXMS150 is a high performance

monolithic 2-channel PWM controller.

Implemented in CMOS, the low power

IXMS150 precisely controls the current

in each of two separate power H-bridge

drivers using unique sampling and

signal processing techniques. Each

channel contains an error amplifier,

PWM, feedback amplifier, and protec-

tion circuitry. Protection features include

over/excess current shutdown, min/max

duty cycle clamp, under voltage lock-

out, dead time insertion, and a shutdown

input for over-temp or other external

fault circuitry. Other features include a

common oscillator, feedforward circuit

for motor supply compensation, and an

onchip negative bias generator.

The IXMS150 has been optimized for

microstep control of two phase step

motors. Due to its high level of accu-

racy, the IXMS150 will allow a designer

to implement a control system with a

resolution in excess of 250 microsteps

per step, or 50,000 steps per revolution

with a 200 step per revolution step

motor. The IXMS150 greatly improves

positioning accuracy and virtually

eliminates low speed velocity ripple and

resonanceeffectsat afractionof the cost

of a board level microstepping system.

Other applications which the IXMS150

is designed for include control of two

single-phase (DC) motors or control of

synchronous reluctance motors. The

IXMS150 is ideal for robotics, printers,

plotters, and x-y tables and can facilita-

te the construction of very sophisticated

positioning control systems while signi-

ficantly reducing component cost, board

space, design time and systems cost.

Features

l

Two complete, synchronous PWMs

l

Command input range ±2.0 V full

scale

l

±0.625 V full scale current feedback

signal

l

1% gain matching between channels

without external trim

l

1.6% gain linearity

l

Feedforward to compensate for

motor supply variations

l

Only one sense resistor per H-bridge

needed

l

Onboard two level current limiting

l

Undervoltage lockout assures proper

behavior on power up and power

down

l

Enable input for external over

temperature or fault circuit input

l

Duty cycles limited for AC coupled

gate drive

l

Wide range of built in dead time.

l

On board negative power supply

generator

l

Single +12 V supply operation

l

24-pin DIP package

Applications

l

Full, half quarter, or microstepping

2-phase step motor position

controller

l

Dual DC servo motor torque

controller

l

Solenoid actuator force controller

l

General 2-channel current-

commanded PWM control

Block diagram of IXMS 150

Symbol

Definition

Max. Ratings

V

DD

Supply voltage

-0.3...15

V

Operating range

10.8...13.2

V

Common-mode-range

-15...15

V

Differential Input voltage ¬

±30

V

V

IN

Input voltage ¬

-15...15

V

V

O

Output voltage

-0.3...V

V

P

D

Maximum power dissipation

500 mW

T

A

Ambient temperature range

-40...85

°C

T

stg

Storage temperature range

-55...125

°C

¬ Input voltage may not exceed either supply rail by more than 0.3 V at any time.

IXYS reserves the right to change limits, test conditions and dimensions.