Single-chip motor controller

16 September 2009 Power Electronics / Power Management

Diodes Incorporated has introduced a single-chip solution providing all the functionality required for driving low-power single coil brushless DC fans and motors. The AH5792 integrates a Hall sensor and amplifier, complete digital control circuitry and a full bridge output driver in the low profile SOT553 package and is particularly suited to low-voltage micro-motors and ultra thin cooling fan applications.

With its bi-directional, H-bridge output stage, the device suits single-phase full wave brushless DC motor control, by offering a pair of push-pull output drivers to source and sink current. The operating voltage range of 1,8 V to 5 V also caters for low operating voltage miniature DC fans requiring low-voltage start-up.

To protect motor windings from damage, the new motor controller includes integrated locked rotor detection and automatic self restart functions which serve to shutdown the output driver in the event of a locked rotor and then restart the motor when the rotor is freed. In addition, a frequency generator output provides users with tachometer-like feedback for external speed monitoring.

The AH5792 has an operating temperature range of -40°C to 100°C and is fully RoHs compliant.

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