PWM Generator Keeps Things Running Smooth

Generating PWM waveforms at frequencies up to 40 kHz, the MC73110 motor controller promises to lower torque ripple while maintaining smooth operation. The single-axis device provides digital velocity and torque control for brushless dc motors and requires just a MOSFET or IGBT triple half bridge to create a complete intelligent motor controller. It operates in one of three modes: internal velocity profile mode, velocity mode with an external command signal, and torque mode with an external command signal. Other features include software-programmable velocity and current loops, 6-step and sinusoidal commutation, analog or digital command input, profile generation, and digital current loop. The MC73110 comes in a 64-pin PQFP and operates from a 3.3V supply. Price starts at $18 each in OEM quantities. PERFORMANCE MOTION DEVICES INC., Lincoln, MA. (781) 674-9860.