DF339

3-Phase Brushless DC Motor Controller

©Copyright 2017, PADAUK Technology Co., Ltd.

Page 8 of 11

PDK-DS-DF339-EN-V000 – Jun. 28, 2017

4. Block Diagram

5. Functional Description

DF339 is a controller which is target for 3-phase brushless DC motor with hall sensor; there are five functional

modules inside the DF339: Main Control, Current Detector, Motor Sequence Control, Position Detector and

Interface. Its functional descriptions are shown as below:

5.1. Main Control

This Main Control module is coordinator to maintain the finite state of the system. It receives the command

passed by user interface detector and motor current from current detector module, and then determines the

next action for motor based on those two received conditions.

5.2. Current Detector

This module is used to detect the feedback current of motor (ISENSE_IN) and send to main control module, the

main control will stop the motor whenever the sensing current reaches the value corresponding to over current

protection.

5.3. Motor Sequence Control

The motor sequence control module controls the power MOSFET ON/OFF of motor. It depends on the position

information sent by position detector module to output the six driving signals (PWM_AH, PWM_AL, PWM_BH,

PWM_BL, PWM_CH, and PMW_CL) that can be directly associated to the sequence phase of motor.

Motor

Sequence

PWM_AH

PWM_BH

PWM_CL

ISENSE_IN

Current

Detector

Main

Control

Interface

PWM_IN

FG/RD

Position

Detector

HALL_A

HALL_B

HALL_C

DF339