Stepper motor drivers

2 February 2011 Power Electronics / Power Management

ON Semiconductor has announced two new highly integrated driver ICs to drive high-current stepper motors. The new AMIS-30532 and AMIS-30542 micro-stepping motor drivers have high current capabilities with integrated H-bridges and are designed for motion control designs in automotive, industrial, office equipment, medical, security and marine applications.

Designed for use with two-phase stepper motors and a host microcontroller, the AMIS-30542 mixed-signal motor driver ICs provide highly accurate and reliable motor control and deliver maximum current outputs of 2,2 A continuous and 5,0 A peak. Each device integrates smart motor control capability with voltage regulation, onboard current sensing and a number of protection and diagnostic functions. This level of integration eliminates the need for external switches and sense resistors. Onboard speed and load angle feedback mitigates end of line switches and hall sensors on applications ranging from surveillance cameras, robotics, printers, industrial automation equipment and textile machines.

The new ICs feature two embedded H-bridges and connect to a host microcontroller via an SPI interface and dedicated I/O pins. Each chip provides speed and load-angle output, which allows for the accurate control of motor torque and speed as well as the creation of stall detection algorithms. Seven step modes can be configured, from full step to 32 micro-steps. An on-chip current translator is used to calculate the appropriate PWM current based on the clock signal at the ‘NXT’ input pin and the status of the direction register or input pin. The PWM current control includes automatic selection of fast and slow decay modes.

Both the AMIS-30532 and AMIS-30542 are compatible with 5 V and 3,3 V microcontrollers; the integrated voltage regulator can be used to provide microcontroller power. Each device also incorporates a microcontroller reset function and an integrated watchdog function. Thermal warning and shutdown functionality and full output protection and diagnosis capabilities are also provided.

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