UCC2809D-2G4

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The UCC2809D-2G4 is an advanced hybrid pulse-width modulation (PWM) controller. It is a single monolithic integrated circuit that combines all the functions of a peak current mode, line frequency controller and an integrated timer; this enables it to offer superior performance and far easier configuration than most prior devices. The UCC2809D-2G4 also provides improved protection features, including cycle-by-cycle current limit, line frequency soft-start, over-temperature shutdown, over-voltage switch-off, current limitation and over-voltage lock-out.

The UCC2809D-2G4 can be used to regulate the output of a switching power supply in an AC-DC or DC-DC converter application. Thanks to the integrated peak current mode controller and line frequency controller, the UCC2809D-2G4 is an ideal device for applications that require wide input line frequency range, low noise and high efficiency. In addition, the integrated timer enables the device to be used for applications such as joule theft protection.

Working Principle

The UCC2809D-2G4 uses a peak current mode control scheme with a voltage-mode reference circuit. This controller requires an external power feedback circuit to ensure proper output voltage regulation. In addition, the UCC2809D-2G4 provides fault protection by monitoring the output voltage for over-voltage and over-temperature conditions. When the output voltage exceeds the predetermined limit, or when the temperature of the device exceeds a predetermined limit, the device will shut down. The device also features a programmable cycle-by-cycle current limit that can prevent short-circuit and over-load conditions.

At low line frequency, the UCC2809D-2G4 operates as a Pulse Width Modulation (PWM) controller. A low frequency triangle wave is used as the reference signal and the device is set to a specific frequency and duty cycle. The output voltage of the device is controlled by adjusting the duty cycle. At high line frequencies, the UCC2809D-2G4 operates as a Pulse Frequency Modulation (PFM) controller. The output voltage of the device is controlled by changing the switching frequency. This allows for optimal efficiency, as the device doesn\'t need to constantly switch between different duty cycles.

Conclusion

The UCC2809D-2G4 is an excellent choice for advanced AC-DC or DC-DC converters requiring low noise and high efficiency. The device\'s integrated current mode control scheme provides superior performance and flexibility compared to most previous devices. In addition, the device\'s protection features ensure reliable operation in the most demanding applications. For more information, please consult with your local sales representative or application engineer.

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