LEB225F-0524-U

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AC-DC converters are circuit devices that convert alternating current (AC) electricity to direct current (DC) electricity over a range of hundreds of volts. The LEB225F-0524-U is one such AC-DC converter that can handle high power input, as well as provide tight load regulation and a fast transient response. In this article, we\'ll take a closer look at the application field and working principle that underlie the LEB225F-0524-U.

The LEB225F-0524-U is designed for regulated, negative-output applications that require high performance, such as in industrial automation, process control, networking, communications, and others. It facilitates seamless conversion of household AC current (90 - 264Vac) to 24Vdc at up to 11A output for a wide variety of applications. It features PFC (Power Factor Correction) that can reduce input power ripple, and an isolated baseplate to allow for a clean output voltage. Additionally, it utilizes pulse-width modulation (PWM) for precision regulation, providing very tight load regulation to ensure output accuracy and very good AC and DC transient response. It has a high power density of up to 372W/in3 and is highly efficient, with no-load power consumption of <0.3W for 99% efficiency.

On the inside, the LEB225F-0524-U utilises a multi-phase forward topology, allowing the converter to achieve both high efficiency and fast transient response simultaneously. In operation, it captures power cycle by cycle when an AC signal is applied, rectifies and filters it, and then transfers it to the output through the multi-phase DC-DC conversion stages. The conduction input stage comprises of a single-stage full-bridge rectifier synchronous with the mains AC voltage, providing high efficiency and fast transient response. PFC operation is achieved through a diode-free single switch. The conduction output stage is a multi-phase forward design, consisting of multiple pairs of power MOSFETs connected in parallel for higher current handling, and controlled with interleaved PWM current conveyor outputs for better load regulation and faster transient response. The duration of each pulse is determined with current-mode control of the output stages combined with phase-shift control of the input stages.

The LEB225F-0524-U also offers a wide variety of protection features, including over-voltage, over-current, over-temperature, input-under-voltage, and output-under-voltage. In addition, it also features remote on/off control for remote monitoring and operation control, which can be useful for certain applications. It has a small form factor, making it suitable for applications where mounting space is an important consideration. In summary, the LEB225F-0524-U is a high-performance, high-efficiency AC-DC converter that is ideal for high-power negative output applications.

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