DRIVING DEVICE FOR FAN MOTOR, COOLING DEVICE USING THE SAME, AND ELECTRONIC APPARATUS

摘要

PROBLEM TO BE SOLVED: To downsize a driving device for a fan motor.

SOLUTION: A driving device 100 drives a fan motor 6, a three-phase brushless DC motor. A built-in Hall element 9 is disposed adjacent to the fan motor 6 and generates a pair of Hall signals in response to a position of a rotor of the fan motor 6. An internal power supply 21 supplies a bias signal to the built-in Hall element 9. A Hall-signal processing unit 11 cancels an offset of the pair of the Hall signals and amplifies the Hall signals. A driving processing circuit 13 drives the fan motor 6 based on an output signal of the Hall signal processing unit 11. The driving device 100 is integrated on one semiconductor substrate.

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