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A New Approach to Circuit Breaker Design Using Silicon Carbide Switches - Nov 21
Mechanical circuit breakers can be low cost with minimal losses, but they operate slowly and wear out. Solid state versions overcome the problems and are becoming increasing viable as replacements at...
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Power Electronics Europe News
 
Combined motor driver IC saves board space

The IC is capable of driving one stepper motor and one DC motor. The stepper driver PWM current regulator from Allegro MicroSystem uses the company’s patented mixed-decay mode for reduced audible motor noise, increased step accuracy, and reduced power dissipation.

The bipolar stepper driver outputs are rated up to 1.6A and the high current DC driver at 3.2A. The IC includes fixed off-time PWM (pulse width modulation) current regulators, along with 2bit non-linear DACs that allow stepper motors to be controlled in full, half, and quarter step modes.

The IC is targeted at the consumer, industrial and office automation markets, including point of sale, lottery, ticketing, laser, inkjet and label printers, copiers, vending, and ATM machines.

The DC driver can operate in forward, reverse, coast and brake modes with either fast or slow PWM decay control. 

Protection features include thermal shutdown with hysteresis, under-voltage lock-out, crossover current, and over-current protection. Low current sleep mode is included to improve efficiency.

The IC is supplied in a leadless 6.0 x 6.0 x 0.9mm, 36pin QFN package with exposed power tab for enhanced thermal performance. The package is lead- (Pb) free, with 100% matt-tin leadframe plating.

 



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