UCC38500DWTR

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Power Factor Correction (PFC) is a technology in power supplies used to improve the quality of power output from an AC power source. The UCC38500DWTR is based on the DSP Controlled Resonant PFC (CRP) topology and its associated application fields and working principles are the key features responsible for its excellent performance.

UCC38500DWTR Application Fields

The UCC38500DWTR PFC is intended to allow AC/DC power conversion with efficient power transfer, improved power factor, high line regulation, low output voltage ripple and superior EMI characteristics. It is applicable to power supplies from 500W to 2000W, accommodating input voltages ranging from 85V to 305V AC. It is typically used in a wide range of products, including domestic appliances, lighting, industrial control, white goods, outdoor AC/DC systems and security systems.

UCC38500DWTR Working Principles

The UCC38500DWTR is based on a DC/DC buck-boost converter with a CRP PFC front-end. A Pulse-width Modulation (PWM) control loop controls the power factor. This loop maintains the peak power factor of 0.99 or higher. The controller allows for bidirectional power flow and features selectable current sharing, enabling multiple converters to be paralleled. The overall control loop senses the output power level, the inverter output current and the AC input voltage and adjusts the PWM duty cycle accordingly.

The PFC also features protection logic that prevents damage due to external faults such as undervoltage lockout, overvoltage protection, overcurrent protection and overtemperature protection. Additionally, built-in isolated gate drivers provide a low leading zero-cross noise, creating far less noise between the PFC and the power stage. This makes it suitable for a wide range of applications.

The unique feature of this PFC controller lies in its high power transfer efficiency and power factor, while it meets the same requirements of other typical PFC controllers. This latest device enables OEMs to design simple and low cost AC/DC power supplies and systems, verifying with international standards.

Conclusion

The UCC38500DWTR PFC controller features a DC/DC buck-boost converter and CRP PFC control loop that provide exceptional power factor and efficient power transfer. Furthermore, the controller enables flexible current sharing and advanced built-in protection logic, along with low leading gate cross noise that make it suitable for a wide variety of applications.

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