STMicroelectronics AN392 Application Note Microcontrollers and TRIAC-based Dimmers

About this manual

This document details two applications utilizing the ST6210 microcontroller: a universal motor drive and a light dimmer. Both systems use phase-delay control via logic-level or snubberless TRIACs to regulate power for loads such as vacuum cleaners, food processors, drills, lamps, and halogen spots.

The note provides circuit diagrams, component specifications (including the ST6210 MCU and BTA16-600CW/BTA08-600SW TRIACs), software logic descriptions, and operational guidelines for interfacing with mains voltage. It covers user interface options like touch sensors, push buttons, and potentiometers.

What's inside

• Introduction
• Universal motor drive
• Power control
• User interfaces
• Software
• Light dimmer
• Operation with a transformer
• TRIAC drive

Specifications

Frequently asked questions

What microcontroller is used in the motor drive and light dimmer applications?

The ST6210 microcontroller is chosen for both the universal motor drive and the light dimmer applications.

Which user interfaces are supported by these circuits?

The circuits support touch control, push buttons, and potentiometers as optional user interfaces.

What applications are suitable for the universal motor drive circuit?

Suitable applications include vacuum regulation, speed control in food processors, drill torque limiting, and washing machine door openers.