UCC38502DW

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UCC38502DW Application Field and Working Principle

UCC38502DW is a type of PMIC - PFC (Power Factor Correction) device commonly used for AC-DC power supply conversions. It employs an active power factor correction technique to accurately regulate the AC source voltage and achieve power factor (PF) performance of greater than 0.96 from input sources ranging from 80 VAC to 264 VAC. As a member of the family of Texas Instruments\' advanced active power factor correction controllers, UCC38502DW simplifies the design of mid-power factor AC-DC power supplies and eliminates the need for a complex set of components, resulting in faster time To Market (TTM).

Application Field

UCC38502DW performs best in mid-power designs where the load current is high enough to require the use of an active PFC but not high enough to require the high performance of a more expensive active PFC controller. Typical applications include front-end power supplies, industrial power supplies, and power conversion systems. With its low start-up and operating currents, the UCC38502DW is also an ideal choice for green designs and energy savings.

Working Principle

UCC38502DW applies active power factor correction, which requires detecting and monitoring the source voltage and current. To detect the source voltage and current, UCC38502DW includes a Peak Detector that compares the source current to a reference and does the ripple correction. To accurately control the rectified voltage, UCC38502DW also includes a BuckBoost circuit that provides fast response and minimal voltage deviation. The BuckBoost uses a single ended primary inductor for magnetics or coupled inductor for higher power designs.

The UCC38502DW works by varying the amount of switching being done by the BuckBoost in relation to the current peak detected. For example, when the secondary current ripple exceeds the reference peak level, UCC38502DW will increase the switching, which in turn reduces the peak and improves the power factor. If the secondary current ripple remains below the reference peak level, UCC38502DW performs a soft switch and avoids a hard ultra-fast switch to minimize the noise generated. Overall, UCC38502DW provides a dynamic, real-time regulation of the source voltage, making it a reliable and versatile circuit.

Conclusion

UCC38502DW is an effective, efficient, and reliable type of PMIC - PFC device that simplifies the design of mid-power factor AC-DC power supplies and eliminates the need for a complex set of component. It provides fast response and minimal voltage deviation in order to accurately control the rectified voltage. This makes UCC38502DW an ideal choice for energy savings and green designs.

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