UCC28503DW

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UCC28503DW Application Field and Working Principle

UCC28503DW is a Power Factor Correction (PFC) controller designed for isolated flyback switching power supplies. It is an advanced, energy-efficient and reliable power factor correction controller which greatly simplifies the design of isolated flyback switching power supplies. The device includes Power Factor Correction (PFC), low power dissipation, low cost, and low component count. All of these features make UCC28503DW ideal for application in Power Factor Correction (PFC) systems.

Features of UCC28503DW

UCC28503DW offers several features which make it an ideal choice for PFC applications:

• Integrated MOSFET driver with bootstrap MOSFET driver and control circuit —This provides robust operation and improved control of the system.
• Wide input voltage range —The operating input voltage range is between 3.0V and 48V.
• Active Power Factor Correction (PFC) Control —Using this, it is possible to obtain precise and stable power factor correction regardless of input voltage and load variations.
• Built-in protection features —The device includes over-temperature, over-voltage and under-voltage protection. This allows the power supply design to be more reliable and reduce system cost.
• Ease of use—The device has easy-to-use internal configuration options, as well as external programming options for full customization of the application.
• Low cost—The device is relatively inexpensive compared to other CFL controllers. The cost savings come from the integrated MOSFET driver and the reduced number of components required.

Applications of UCC28503DW

Due to its robust and advanced features, UCC28503DW can be used in a wide variety of Power Factor Correction (PFC) applications, such as:

• AC/DC Power Supplies
• Battery Chargers
• Switching Regulators
• LED Lighting
• High-Efficiency SMPSs
• Computer Peripherals and Consumer Electronics

Working Principle of UCC28503DW

The UCC28503DW PFC controller is based on the Flyback topology, where the output voltage is generated by a transformer coupled to the input voltage source. The controller operates in two phases. In the first phase, the Primary Side Controller (PSC) constantly varies the duty cycle of a MOSFET to adjust the average voltage across the output of the transformer, thereby regulating the output voltage. The energy stored in the transformer is transferred to the output in the second phase, known as the synchronous rectification phase. In this phase, two MOSFETs connected in an H bridge are enabled alternatively to rectify the output voltage. The synchronous operation allows the converter to be very efficient and also eliminates any power losses due to the diode reverse recovery.

The UCC28503DW features all the features that are needed to control the switching cycles of the MOSFETs. It includes an internal MOSFET driver with bootstrap MOSFET driver and control circuit, as well as over-temperature, over-voltage and under-voltage protection. Additionally, the device supports external programming options to customize the power supply design according to the application requirements.

Conclusion

The UCC28503DW is a sophisticated and advanced Power Factor Correction (PFC) controller that enables the design of efficient, reliable and cost effective isolated flyback switching power supplies. The device is ideal for a wide variety of applications, including AC/DC power supplies, battery chargers, switching regulators, LED lighting, high-efficiency SMPSs, computer peripherals and consumer electronics. Furthermore, the device incorporates various features such as integrated MOSFET driver with bootstrap MOSFET driver and control circuit, wide input voltage range, active PFC control, built-in protections and external programming options, which make it an ideal choice for Power Factor Correction (PFC) applications..

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