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This application note reports on the design of a 2 kW-100 V, 123 MHz Class AB peak power amplifier (PPA) for 3 Tesla MRI applications. It almost doubles the output power of previous amplifiers using MOSFET transistors in standard ceramic packages. The design techniques and construction practices are described in enough detail to permit duplication of the amplifier.
This document presents the general principle of LCD screens and the cause of flicker. It also proposes a solution of automatically minimizing flicker using the STVM100 (LCD VCOM calibrator).
This application note briefly describes the basic principle of e-paper so that the user can understand the necessity of an accurate VCOM voltage setting and how the STVM100 can be used for this purpose.
This application note introduces the concepts of gate current (IG) and holding current (IL) for thyristors (SCRs) and triacs. Also provided are procedures for measuring IG and IL, and a discussion of the variation of IL with operating conditions and device sensitivity.
This article mainly introduces the phenomena that may occur in the circuit when controlling the AC power source using the triac, and how to avoid these phenomena by controlling the trigger mode of the triac to ensure the normal operation of the circuit.
AN308 is ST's application note, which introduces how to use TRIAC to control inductive loads, including the introduction and analysis of different control methods, and finally proposes a simple and reliable control circuit.
This article describes the features and characteristics of logic level and Snubberless TRIACs, and their current commutation capabilities when turned off.
This document describes a trigger circuit for triggering the TRIAC in the second and third quadrants in a system using a positive power supply. New series TRIACs can replace conventional TRIACs by simply adding a capacitor and a diode.
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.
This note explains the thermal management precautions for handling and mounting semiconductor devices, including how to calculate a suitable heatsink and precautions for handling, mounting and soldering techniques.
This document introduces a logic-level transient-voltage protected AC switch, which can be directly driven by a microcontroller unit (MCU) and has robustness against AC line transients to comply with electromagnetic compatibility (EMC) standards.