UCC28C44PG4

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The UCC28C44PG4 is a monolithic Power Factor Correction (PFC) controller designed for professional online power supplies. It is particularly designed for zero crossing variable frequency, high Power Factor and high efficiency (up to 96.5%) application in the power range between 254.3 and 340Vrms. The device combines primary side regulation and quasi-resonant operation with Burst Mode operation or Low Frequency Mode (LFM) so that a full range of operation is achievable. This makes the UCC28C44PG4 ideal for applications such as PC Power Supply, LCD TV and Office Products.

The UCC28C44PG4 can be classified as a PMIC – AC DC Converters, Offline Switchers and is used for many different applications depending on the specific project. This type of unit is most often used to regulate and convert direct current (DC) to alternating current (AC) and is used in Solar inverters, Grid-connected PFC and Uninterruptible Power Supplies (UPS). AC DC converter technology converts AC to DC and DC to AC more efficiently than traditional power supplies. In some applications, the UCC28C44PG4 provides secondary power conversion and regulation in addition to providing primary power conversion and regulation.

The UCC28C44PG4 is efficient and economically designed with a wide range of features and integrated functions. The device enables the highest power density and efficiency while its low component count ensures a simplified design and reduces design costs. The device\'s fast transient response and near zero voltage switching incorporates a low noise operation.

The UCC28C44PG4 also features a digital current controller with analog control, which can be adjusted to increase the power factor of an application and compare energy efficiency. This integrated feature enables the device to recognize predetermined conditions in an application such as current peak and valley time, and provide a better output quality by optimizing the power delivery. Additionally, the UCC28C44PG4 features an integrated voltage feedback loop that can be used to control the output voltage of an application.

The UCC28C44PG4 incorporates a single stage high-performance PFC architecture that utilizes a quasi-resonant (QR) winding topology to achieve a high power conversion efficiency. The device also integrates a Low Frequency Mode (LFM) for a wide range of input voltage applications. With the LFM, a switched capacitor is used to reduce the system size, noise and power loss. The device also features a unique frequency synchronization function that helps reduce output voltage ripple and harmonics, resulting in increased overall system efficiency.

The UCC28C44PG4 is also capable of achieving excellent performance in terms of efficiency, conducted and radiated EMI, and output voltage ripple for most applications. Additionally, the device is compatible with low cost, high performance capacitors, offering improved cost effectiveness for system design. The use of external compensation components allows the UCC28C44PG4 to meet a wide range of application requirements.

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