ACT411US-T

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The ACT411US-T is an intermediate frequency transformer (IFX) based power module designed for power supply applications with relatively low power performance requirements of up to 50 watts. It is part of the PMIC (Power Management Integrated Circuit) family of electronics. PMICs are designed to make power supply applications easier by providing a complete solution for powering electronic devices and systems in various applications. The ACT411US-T is an integrated circuit application-specific device that is used in AC-DC, offline switcher and DC-DC converter designs.

The ACT411US-T is designed to provide an efficient solution for low power applications by combining on-chip regulators and integrated passive components. The ACT411US-T consists of an I/O emitter-coupled voltage controlled oscillator, cascode transistors, driver transistors, an I/O filter, and a feedback network. The IC also includes a direct Voltage Mode (VM) control, allowing for better accuracy and control of the voltage output. The IC integrates the functions of the analog control section and the digital control section of a power supply into one package, thus ideal for designs that require high efficiency.

In terms of application field, the ACT411US-T can be used in variable- frequency applications such as AC-DC power supplies, offline switchers, and DC-DC converters. AC-DC power supplies require a variable- frequency oscillator to generate an AC waveform which is then rectified and smoothed to create a DC output voltage. The ACT411US-T is designed to provide an optimal such frequency varying control to generate the cleanest possible waveform. For offline switching applications, the ACT411US-T is an ideal choice for providing excellent frequency and current control to the switching components for optimum efficiency.

The ACT411US-T is also well suited for DC-DC converter designs, where it can be used to provide voltage and current control of the output voltage. For example, it can be used to provide over-voltage, current-limit, and soft-start features. It can be used in isolated and non-isolated designs simultaneously, providing a single device solution for DC-DC applications.

The ACT411US-T is designed to provide maximum efficiency and output accuracy. The voltage mode control mode used by the IC allows for excellent linearity and a wide range of parameters for the designer to set. The IC also has various integrated performance enhancing features like a frequency limit setting which prevents the output frequency from going too low or too high, and an over-voltage protection feature, to prevent over-voltage from occurring. It also has a wide operating temperature range of -40ºC to +85ºC, eliminating the need for extra cooling solutions, and thus reducing the cost.

In conclusion, the ACT411US-T is a highly integrated and efficient power management IC designed for application in AC-DC, offline switcher, and DC-DC converter designs. It provides an optimal solution for all of these applications by combining an I/O emitter-coupled voltage controlled oscillator and active components into one device, allowing for accurate and reliable control of the output voltage. Additionally, the IC includes several features to improve efficiency, such as frequency limit and over-voltage protection, as well as a wide operating temperature range. As such, the ACT411US-T proves to be an excellent choice for power supply applications with low power requirements.

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