UCC28740D

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The UCC28740D is an AC DC converter and offline switcher designed and developed by TI, an American chip manufacturer. The device is suitable for a wide range of applications, ranging from those that require low-cost, low-noise, highefficiency circuitry to those that require the highest levels of power system integration. UCC28740D is a high-performance, full-bridge, buck-boost converter with synchronous rectifier, featuring a wide input voltage range and high load-side current capacity.

The main features of UCC28740D enables it to be used in many diverse applications. It has a wide input voltage range from 25V to 600V, which makes it suitable for a variety of input sources like AC, DC and other non-line sources. The switching frequency is up to 500kHz, making it applicable for high frequency and high efficiency applications. The totem-pole output stage allows it to provide 3rd order harmonic suppression and high power system integration. The device also features integrated transient protection, providing it with the ability to meet many abnormal load conditions without additional protection.

The main working principle of the UCC28740D consists of four elements. First, the input voltage is converted to an analog control signal. This signal is used to drive the output transistors, allowing them to switch current from the input power source to the load. Second, the sense amplifier interacts with the charge pump to provide the necessary feedback for the controller which allows the device to switch at high efficiency and low power loss. Third, the output filters clean up the waveforms, providing a smooth DC waveform for the load. Finally, the hysteretic loop controls the output voltage and current. Applying the appropriate voltage and current signals to the appropriate components, the controller is capable of maintaining the stability of the system.

In conclusion, UCC28740D is a highly integrated AC DC converter and offline switcher that is suitable for a wide range of applications. Its wide input voltage range and high load side current capacity make it suitable for use with a variety of input sources. Its high switching frequency and integrated transient protection allow it to meet many abnormal load conditions without additional protection. Finally, its hysteretic loop, combined with itsSense amplifier and charge pump, allow it to provide the necessary feedback for the controller to maintain the stability of the system all the time.

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