High Performance Dual PWM Microstepping Controller

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 protection circuitry. Protection features include over/excess current shutdown, min/max duty cycle clamp, under voltage lockout, 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.

Features
• Two complete, synchronous PWMs
• Command input range ±2.0 V full scale
• ±0.625 V full scale current feedback signal
• 1% gain matching between channels without external trim
• 1.6% gain linearity
• Feedforward to compensate for motor supply variations
• Only one sense resistor per H-bridge needed
• Onboard two level current limiting
• Undervoltage lockout assures proper behavior on power up and power down
• Enable input for external over temperature or fault circuit input
• Duty cycles limited for AC coupled gate drive
• Wide range of built in dead time.
• On board negative power supply generator
• Single +12 V supply operation
• 24-pin DIP package

Applications
• Full, half quarter, or microstepping 2-phase step motor position controller
• Dual DC servo motor torque controller
• Solenoid actuator force controller
• General 2-channel currentcommanded PWM control