ACT413US-T

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Power management integrated circuits, or PMICs, are a critical component of any embedded system. PMICs provide various power-conversion functions such as DC-DC conversion, AC-DC conversion, dynamic voltage and current regulation, and power sequencing. Among these power-conversion functions, AC-DC conversion is the most widely used and the most difficult to implement because of the complex supply network and regulatory requirements. The ACT413US-T is a PMIC designed to offer small, efficient AC-DC offline switcher solutions for powering embedded systems and other products.

The ACT413US-T is a single-stage, offline flyback switcher with a fixed 2W power rating for applications such as digital home appliances, battery chargers, and other high-volume embedded systems. It features a peak efficiency of greater than 97%, a low component count, high output isolation, and industry-standard, available-to-promise solution. It is designed to minimize component complexity and minimize external component count while still providing flexible power-routing options. The ACT413US-T also provides system-level safety measures, thermal protection, output-voltage trim, and fault protection.

The ACT413US-T uses a flyback topology to accomplish AC-DC conversion. In flyback converters, the power FET switch turns on and off at a fixed frequency, and the magnetizing inductor stores energy during the "on" duration and releases it during the "off" duration. The energy converted from the AC source is transferred to the storage inductor, where it is stored and delivered as DC to the output. During the off state, the energy stored in the inductor is then recovered and re-converted back to the AC waveform. This process of converting energy back and forth is a continuous cycle that has the advantage of allowing the supply to be a wider range of voltages.

The ACT413US-T also features two important components: the power FET and the operating transistor. During the switching states, the operating transistor is used to drive the power FET, enabling it to turn on and off. At the same time, the transformer primary winding is wound around the FET and is used to generate the isolated output voltage. The secondary winding is connected to the rectifier diode, which is used to convert the isolated signal to a DC voltage. The output capacitor then provides filtering and voltage regulation. Finally, the optocoupler is used to provide feedback from the output to the controller IC.

The ACT413US-T is a highly advanced offline switcher solution for powering embedded systems. It features a peak efficiency of greater than 97%, low component count, output isolation, and industry-standard abilities. It also provides safety measures, thermal protection, output voltage trim, and fault protection. This makes the ACT413US-T an ideal choice for applications such as digital home appliances, battery chargers, and other high-volume embedded systems.

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