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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
resonance effects at a fraction of 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
DD
+0.3 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.
