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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
 
Bipolar stepper motor IC eases operation
The integrated bipolar stepper motor driver IC is designed to operate bipolar stepper motors from full-step up to 1/32 step modes that are selectable by MSx logic inputs. It has an output drive capacity of up to 40V and ±2A and operates with a single supply. It is targeted at industrial automation markets and offices, in applications such as robotics, automatic teller machines, point of sale and laser printers, 3D printers, copiers, CCTV cameras, vending or sewing machines.

The motor driver IC introduces a proprietary Adaptive Percent Fast Decay (APFD) algorithm to optimise the current waveform over a range of stepper speeds and stepper motor characteristics.  APFD adjusts the amount of fast decay on-the-fly to maintain current regulation while minimising current ripple. This adaptive feature improves performance with reduced audible motor noise, reduced vibration, and increased step accuracy. The translator allows the inputting of one pulse on the step input to drive the motor one microstep. There are no phase sequence tables, high frequency control lines, or complex interfaces to program. The interface suits applications where a complex microprocessor is unavailable or is overburdened, claims the company.

Internal synchronous rectification control circuitry improves power dissipation during PWM operation. Internal circuit protection includes over-current protection for motor lead short to ground or supply, thermal shutdown with hysteresis, under-voltage lockout (UVLO), and crossover-current protection. Special power-on sequencing is not required.

The IC is supplied in a 28pin, 5.0 x 5.0 x 0.90mm QFN package with exposed pad for enhanced thermal dissipation, The package is lead (Pb) -free, with 100% matt tin plated leadframe.


 



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