UCC28711D

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Integrated circuits are playing an increasingly important role in providing reliable, efficient, and cost-effective electrical energy solutions. The UCC28711D from Texas Instruments is an integrated circuit that provides critical features for offline power supplies, such as a secondary-side-sensing and control system for the output of a power supply. The UCC28711D is part of the Simple Switcher family, with its single-channel synchronous buck controller design providing power conversion with improved power efficiency, small board area, and simple configuration.

Application Field

The UCC28711D is a PMIC (Power Management IC) and part of the AC/DC conversion category, which is used in offline applications such as embedded processors and FPGAs. It supports up to 15W of output power and can be utilized in mobile phones, digital cameras, personal health devices, gaming terminals and other consumer electronics.

In terms of features, the UCC28711D is designed for flyback and forward converters, as well as secondary-side-tracking applications. It offers a wide range of features designed to make converter design easier, such as a programmable start-up delay timer, a programmable soft-start timer, overvoltage protection and true remote sensing.

Working Principle

The UCC28711D is a single channel positive synchronous buck controller. It utilizes integrated power MOSFETs with linear current control to improve efficiency. The devices’ internal topology minimizes the effects of input voltage transients and associated start-up losses. This ensures the device provides effective output-voltage regulation up to a wide range of input voltage conditions.

Using the phase-shift method, the UCC28711D efficiently manages the output voltage of an AC/DC converter. The UCC28711D uses the current-mode feedback scheme, which compares the value of inductor current to the ramp generated by an internal oscillator. The error between these two vectors can then be used to adjust the duty cycle of the pulse-width modulation (PWM). The device has a low-ripple transfer function, which allows for better dynamic load response.

The device also offers protection features such as overvoltage protection. It utilizes the occurrence of input-voltage-to-output-voltage ratios to enforce current limits.] If the measured voltage is outside the parameters, then the device will shut down. This feature ensures a safe and reliable operation.

Conclusion

The UCC28711D is a single-channel synchronous buck controller designed for offline applications. It is part of the Simple Switcher family from Texas Instruments and can be used in AC/DC conversion applications, such as embedded processors and FPGAs. It features a wide range of features designed for improved power efficiency and easy configuration, such as start-up delay timers, a soft-start timer, and overvoltage protection. Additionally, the device utilizes the phase-shift and current-mode feedback schemes to ensure efficient output voltage regulation. Overall, the UCC28711D is a great choice for applications requiring reliable and efficient power solutions.

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