Rohm Semiconductor has expanded its portfolio of high-reliability stepper motor drivers by adding the BD63843EFV, BD63847EFV and BD63860EFV families. Each of the three drivers offer selectable excitation modes - full-step to sixteenth-step with 1 or 2A output current and full-step to eighth-step with 2.5A output current. The microstep drivers enable designers to optimise motor torque, noise and vibration for a range of industrial applications. For example, full-step mode is suitable for sets requiring large current for high torque, while the eighth or sixteenth-step mode features a smooth output waveform for lower noise and vibration. The selectable current decay pattern, i.e. fast, slow and mixed decay modes can be used to enhance motor performance, says the company. Circuit design is simplified through a combination of features including an internal voltage regulator, control input translator and DMOS output. The built-in regulator permits operation from a single (maximum) 36V supply. Instead of parallel control lines, a single clock input is converted by the device's internal translator into motor drive signals. The company‘s DMOS output topology eliminates the need for external charge pump components.
