UCC28634D

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The UCC28634D is a single-channel flyback power supply controller designed to provide low-cost, high-efficiency power conversion for applications requiring up to 32 W of output power. The device integrates key features such as AC / DC PFC, continuous conduction mode (CCM) flyback control, active valley current control, and high-voltage start-up circuit. Those features help system designers reduce design time, cost, and power losses.

The UCC28634D primarily supports offline switcher power supplies, which often have user-adjustable output voltage. They are typically used in products such as consumer electronics, PCs, and routers with power requirements of up to 32 W. AC/DC offline power conversion is typically performed with forward converters, flyback converters, or PFC-flyback converters. In general, it is most economical to use a low-cost AC/DC PFC-flyback controller, such as the UCC28634D, for applications requiring only minor output power modifications.

The UCC28634D works by integrating a high-voltage, fixed on-time power MOSFET controller with an adaptive current-mode PFC controller. The combined device provides high efficiency and low EMI. The high-voltage start-up circuit implemented with the device minimizes the external components to reduce system cost. The active valley current control allows for very fast transient response to light load and the current limit provides protection from overcurrent events.

The UCC28634D uses a minimum number of external components, including input and output capacitors, a bias capacitor, a transformer, a diode, and a resistor, to provide a cost-effective powertrain solution with high efficiency, improved power quality, and low EMI. The resistive feedback loop adjusts the output voltage as required by the system. The device also provides an absolute maximum voltage limit with the output shutdown feature.

In summary, the UCC28634D is an ideal choice for designers looking for a cost-effective, low-EMI offline converter solution that meets their power requirements. It is an AC/DC PFC-flyback controller that provides a highly flexible and integrated powertrain solution for power supplies up to 32 W. The on-chip high-voltage start-up and valley current control ensure rapid transient response and optimal protection from overcurrent events.

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