UCC28503DWG4

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Power Factor Correction (PFC) is one of the most important methods used in controlling the power factor of an electrical system. This can be achieved by using switches and capacitors, or even through special equipment such as UCC28503DWG4. Below is an overview of UCC28503DWG4, including its application field and working principle.

Application Field

UCC28503DWG4 is a highly integrated device used to perform Power Factor Correction (PFC) on current AC power line inputs ranging from 90V - 250V. It is a member of Texas Instruments\' single-chip, high-voltage, off-line PFC controllers, and is ideal for use in medium-power applications that require high-efficiency, low total harmonic distortion, and wide universal input voltage range. These features make UCC28503DWG4 ideal for universal-input applications such as TVs, PDP TVs, type-6 adapters, and LCD monitors.

Working Principle

The UCC28503DWG4 operates using a boundary conduction mode (BCM) technique, which is based on comparing the difference between the switch-on time and the switch-off time vs. the actual input voltage and setting the boundaries of the zero-voltage switching time, zero-current switching time, or any other specified time boundaries to enable or disable the power switch. When the input voltage is higher than the voltage boundary for the turn-off point, the switch will turn off and no power will be supplied from the device, thereby preventing the system from drawing too much power from the input. When the input voltage is lower than the voltage boundary for the turn-on point, the switch will turn on and the system will draw power from the device. The switching frequency of UCC28503DWG4 is digitally programmable and adjustable, enabling it to be changed depending on the needs of the system.

UCC28503DWG4 also has other features that help to enhance the overall performance of the system it’s installed in. This includes an overvoltage protection, peak current sense amplifier, voltage-mode PFC controller, over-temperature protection, and current-recirculation-mode control. These features help to ensure that the system operates safely and within the specified parameters.

Conclusion

UCC28503DWG4 is a powerful and highly integrated device used to perform Power Factor Correction (PFC) on current AC power line inputs. It operates using a boundary conduction mode technique and can be used in medium-power applications that require high-efficiency, low total harmonic distortion, and wide universal input voltage range. It also has multiple safety features such as overvoltage protection, peak current sense amplifier, voltage-mode PFC controller, over-temperature protection, and current-recirculation-mode control for enhanced system performance. Therefore, UCC28503DWG4 is an ideal choice for applications that require consistently reliable power factor correction.

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