DB62

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4"&9 DB62 M I C R O T E C H N O L O G Y )551888"1&9.*$305&$)$0.



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INTRODUCTION The DB62 is designed to demonstrate the capabilities of the SA305 as a 3 phase brushless DC motor driver IC. The PWM inputs to the SA305 are controlled by an on-board microcontroller. The EVAL49 board is pre-wired for all required and recommended external components. Please refer to applications note 32 in the Apex catalog for guidance in filter component selection. The 1µF ceramic capacitors supplied with the kit are for high frequency bypassing of the VS and VDD supplies (C1, C11, C4 and C7 on the EVAL49 schematic). Two additional 100uF bypass capacitors are provided with the kit for the VS supplies (C2 and C12 on the EVAL49 schematic). Please refer to applications note 30 for help with power supply bypassing and other useful information. PWM CONTROL IN DB62 BLDC motors are electronically commutated based on the rotor position. The stator windings are energized in a sequence based upon the combination of three Hall sensor signals which provide the rotor position. In the DB62 the SA305 input PWM control is achieved by means of by an on-board Microchip® PIC 18F2331 microcontroller. The sequence table for commutation (obtained from the motor data sheet) is entered in the program memory of the microcontroller. Hall sensors A, B and C are connected to the IC pins of the Input Capture (IC) module in the PIC18F2331. This module interr...