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Controls/MCUs??

Allegro driver IC operates on 50V

Posted: 31 Jan 2002 ?? ?Print Version ?Bookmark and Share

Keywords:allegro microsystems? allegro? driver ic? controller ic? a3936?

The A3936 controller/driver IC features 3A-capable DMOS outputs and on-chip commutation logic. The chip operates on motor supply voltages up to 50V and motor winding currents of 3A. The A3936 is also compatible with both 3V and 5V logic supplies.

The chip is intended to meet the needs of the white goods, process control equipment, medical equipment manufacturers and office automation applications.

Synchronous-rectification of the integrated on-chip power DMOS outputs is accomplished on the IC with no external commands required. This provides significant improvements in the thermal efficiency of the IC during PWM operation, and eliminates the need for external diodes. The A9396 achieves low power dissipation is through the use of the DMOS outputs during both the on and off cycle of the PWM waveform. In addition, the company's mixed-fast-slow decay mode feature is integrated into the A9396.

The A3936 also features PWM current control of three-phase brushless dc motors, low on-resistance DMOS outputs, synchronous rectification, and configurable slow, fast and mixed-decay modes. A tachometer output is provided to enable easy implementation of an external speed control loop.

The commutation of the brushless dc motor is implemented by supplying the A3936 with three Hall sensor inputs. The IC then processes these inputs and switches the output stages in the proper sequence for either forward or reverse movement of the motor and load.

The 44-lead PLCC-housed device also comes with a copper batwing tab placed at ground potential and needs no electrical isolation.

The A3936 is quoted at $3.18 in quantities of 5000.





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