CSS28024

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AC DC Converters

AC/DC converters, or AC to DC converters, are electronic devices that are used to convert alternating current (AC) into direct current (DC). They are popularly used to power small electronic devices such as smartphones, tablets, and other portable devices. AC/DC converters are also known as power supplies, rectifiers, or inverters. In a basic setup, AC/DC converters typically have an input power source, an output power source, and at least one rectifying circuit, allowing for conversion from AC to DC.

CSS28024 Application Field and Working Principle

The CSS28024 is a monolithic IC designed specifically for AC/DC converters. The device provides conversion of an AC input voltage to the regulated DC output voltage of 5V, 12V, or 24V, depending on the configuration. In addition, the IC provides high efficiency, low noise, and low current consumption. The device uses a three-stage architecture including input rectification, active power factor correction (PFC), and a synchronous rectifier. The active PFC circuit is responsible for providing a regulated input voltage while the synchronous rectifier circuit converts the input voltage to the desired output voltage.

The input rectification stage receives the inputted AC voltage and rectifies it to produce a DC voltage. This DC voltage is then passed through an active PFC stage, in which an efficient switching amplifier is switched at a frequency that is determined by the PFC controller. This switching amplifier ensures that the output current waveform matches the shape of the input voltage, resulting in higher efficiency and improved power factor. In the last stage, the synchronous rectifier switches on and off based on the output voltage, and thereby produces a constant DC voltage under steady state conditions.

The integrated circuit of the CSS28024 includes a wide range of protective functions such as overvoltage protection, undervoltage protection, overcurrent protection, and short-circuit protection. Additionally, the system has a power-saving mode and uses an internal temperature compensation circuit to maintain the maximum efficiency. This makes the CSS28024 suitable for a wide range of applications including power supplies, lighting systems, consumer applications, and more.

In summary, the CSS28024 is a monolithic IC designed specifically for AC/DC converters. It has a three-stage architecture based on input rectification, active PFC, and synchronous rectification and provides high efficiency, low noise, and low current consumption. The IC includes protection features such as UVLO, OVP, OCP, and SCP and is suitable for a variety of applications from power supplies and lighting systems to consumer applications.

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