UCC28634DR

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The UCC28634DR is a highly integrated switch-mode power supply (SMPS) controller integrated circuit (IC) that combines a wide voltage input range, high accuracy current-mode control, gate driver and protection capability. This device is well-suited for flyback converter installations where low-power usage and improved detection accuracy in wide-voltage applications are important factors. The UCC28634DR is part of the PMIC family of AC DC Converters, Offline Switchers, and can be used to efficiently transfer energy from an AC mains to a DC output.

The UCC28634DR operates by providing a current-mode control scheme for operating the output switch even in the presence of wide line-voltage and load conditions. The device further integrates a comprehensive protection function for comprehensive system-level protection. This protection suite includes cycle-by-cycle current limit and over voltage protection (OVP), the features making the UCC28634DR the preferred SMPS controller solution when compared to traditional discrete designs.

The IC includes an internal current-mode control Loop and open loop architecture which simplifies the design process. When operating in current-mode control, the UCC28634DR relies on primary-side current feedback to ensure a stable output voltage. The primary-side sensing eliminates the need for an opto-coupler or a second winding transformer, thereby improving the size and cost of the entire system. Moreover, the internal current-mode control loop eliminates the need for an external compensation network and facilitates easier system tuning. The IC further includes an integrated gate driver, over-current and over-voltage protection to make the design process easier and reduce the system cost.

The UCC28634DR also features a soft-start mechanism which helps reduce the inrush current upon startup. The soft-start function ramps up the primary switch current to prevent the peak current from reaching dangerous levels. The device also incorporates Pulse-Skipping-Mode (PSM) which further improves the overall efficiency of the system by providing fewer on-time cycles at light loads.

In summary, the UCC28634DR is a highly versatile and efficient SMPS controller IC that is well-suited for demanding flyback applications. It combines a wide input range, high accuracy current-mode control and comprehensive protection protections, eliminating the need for external components. This makes the design process simpler and reduces system costs, making the UCC28634DR an ideal choice for SMPS applications.

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