UCC28633D

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The UCC28633D controller is a highly-integrated, constant frequency current-mode buck or boost converter. It incorporates multiple advanced and new features, such as internal active current sharing, valley current control, and adaptive switch current limiting. These features, combined with low external part count, light up the more advanced applications like offline power system with multiple output channels, enabling the highest efficiency, smallest solution size and superior system reliability.

The UCC28633D is an integrated AC/DC power conversion solution for multi-output systems. It combines active power-sharing and valley current control to provide a reliable and efficient power conversion solution. Furthermore, the UCC28633D includes an internal oscillator and driver, minimizing the external component count. The device supports both single-output flyback and offline multiple-output buck and boost topologies, with current rating up to 6A.

The UCC28633D is designed to enable highly-efficient, isolated offline applications with features such as active current sharing, valley current control, and adaptive switch current limit. With active current sharing, multiple UCC28633D can work together in parallel, to ensure the overall system current imbalance is within 10%. Valley current control and adaptive switch current limit provide better reliability, safety, and reduced EMI emission.

The UCC28633D has both a resonance and frequency control option which match the load requirement. The resonance mode provides 0.75μs ZVS response time, with a maximum of 2kHz, allowing the device to operate at higher frequencies. The frequency control mode provides a 0.15μs ZVS response time, with a maximum of 500kHz, for a wide range of applications.

The UCC28633D works on the principle of changing the voltage from the AC source to the desired DC voltage. It uses a boost topology in order to reduce the ripple noise due to the high switching frequency. The device includes an internal oscillator and driver, minimizing the need for external components.The device has adjustable frequency up to 500 kHz or resonance up to 2 kHz, and supports both single output flyback and multiple output Buck and Boost topologies.

The UCC28633D also incorporates multiple advanced features such as active current sharing, valley current control, and adaptive switch current limit. With active current sharing, multiple UCC28633D can work together in parallel to ensure system current imbalance is within 10%. Valley current control and adaptive switch current limit provide better system reliability, safety, and reduce EMI emission.

All these features makes UCC28633D ideal for applications such as AC/DC adapters, LED drivers, and telecom/server power supplies. It is also suitable for space constrained isolated applications, such as space applications, medical equipment, and gaming or industrial equipment.

In summary, UCC28633D is a feature-rich and highly integrated AC/DC power conversion solution for multiple-output systems. It includes multiple advanced and new features, such as active current sharing, valley current control, and adaptive switch current limit, and the device supports both single-output flyback and offline multiple-output buck and boost topologies. Therefore, the UCC28633D is ideal for AC/DC adapters, LED drivers, telecom/server power supplies as well as space, medical, and gaming/industrial applications.

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