UTP6A55MOR

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UTP6A55MOR is a highly integrated off-line AC/DC converter which integrates EMI filter, active PFC, LLC resonant converter and synchronous rectifier in a single device. It features multiple protections, such as over-temperature protection, clipping loop protection, over-voltage protection, etc. It also supports live-line and DIP switch adjustable power output. This integrated circuit can be widely applied to high-power LED lighting applications, such as commercial lighting, LED street lights, as well as downlights and spotlights.

The working principle of UTP6A55MOR can be explained in the following. The off-line AC/DC converter includes the main components, namely the EMI filter, active PFC, LLC resonant converter and the synchronous rectifier. Firstly, the EMI filter helps to reduce the conducted emissions which are produced by the power stage, allowing for lower emissions in compliance with the standard requirements. Following this, the active PFC stage begins operation via a normal boost converter circuit. This stage is used to reduce the total harmonic distortion (THD) of the input current and to prevent the output voltage from exceeding the peak voltage of the AC line input.

Next, the LLC resonant converter stage is employed. It utilizes the combination of capacitance and inductance elements in the LC tank to create a resonance circuit, leading to a sinusoidal switching waveform. This further reduces the THD and increases the efficiency when compared to other AC/DC converter topologies. Lastly, the synchronous rectifier stage is used to recover the power from the AC line. Its main advantages are high efficiency, low EMI noise and small size. The low EMI noise comes from the fact that the losses in the synchronous rectifier are always very low.

In summary, UTP6A55MOR is a highly integrated off-line AC/DC converter which combines the EMI filter, active PFC, LLC resonant converter and synchronous rectifier together. It features multiple protections, such as over temperature protection, clipping loop protection, over voltage protection, etc. Moreover, it supports live-line and DIP switch adjustable power output and is mainly used for higher-power LED lighting applications.

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