This note shows how to connect an ST triac and an ST microcontroller. It introduces a conventional solution that uses a buffer transistor between the microcontroller and the triac, and a new solution that improves the sensitivity of the triacs and the output capability of the microcontrollers, allowing for a simple connection without a buffer transistor.
The document addresses the conventional method of using a buffer transistor between a microcontroller and a TRIAC, noting that this is often unpractical due to low sensitivity in certain quadrants. It introduces a new solution where modern ST microcontrollers have sufficient output current capability to drive standard or sensitive triacs directly.
The document explains how to connect an ST triac and an ST microcontroller.
Yes, a microcontroller can now drive one standard triac or several sensitive triacs without buffer transistors.