UCC3809P-2G4

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The UCC3809P-2G4 is a synchronous offline switcher featuring Constant Frequency Current Mode (CFCM) control optimized for high PF, low component count.This wide input range offline switcher provides an integrated current sense resistor, resistive outputs for programming the switching frequency and synchronizing to an external clock, and an output voltage ramp for soft start or load transient protection. The low standby current and shutdown current is suitable for very low power/standby operation.

The UCC3809P-2G4 is used in applications such as isolated DC/DC converters and other offline switcher designs. Its high efficiency, low component count, and excellent operating performance make it suitable for a variety of applications such as power adapters, chargers, and battery operated portable equipment.

The working principle of the UCC3809P-2G4 is based on a synchronous buck topology. It uses two MOSFETs to control the output voltage. The input is connected to a rectifier bridge and the output is connected to a filter capacitor. A Controller IC is used to control the MOSFETs. The controller monitors and regulates the input, output and other parameters of the circuit in order to maintain the desired output voltage. One of the features of this controller IC is Constant Frequency Current Mode (CFCM) control. This allows for high efficiency at light loads where other topology’s efficiency drops off. The output voltage is regulated by a reference voltage from the controller IC, which is compared to a sense voltage from the output filter capacitor. The difference between these two supplies a feedback voltage to the controller to adjust the duty cycle of the MOSFETs. If the output voltage moves outside the desired range, the controller IC adjusts the duty cycle in order to keep the output voltage within the desired range.

The UCC3809P-2G4 is designed to be used in a wide range of applications requiring the highest efficiency, robustness, and output power. It is ideal for applications such as industrial energy converters, advanced lighting, low-power battery-operated systems and many other types of power supplies.

Overall, the UCC3809P-2G4 is a highly efficient and reliable offline switcher that is suitable for a variety of applications. It features CFCM control, integrated current sense resistor, resistive outputs for programming the switching frequency and synchronizing to an external clock, and an output voltage ramp for soft start or load transient protection. It is a perfect solution for power adapters, chargers, and other battery operated portable equipment.

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