UCC2817DW

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UCC2817DW is a leading-edge switching power supply controller developed by Texas Instruments Inc. It integrates a wide range of power topology designs and provides highly efficient power delivery with minimum external components. It is designed for applications that require power factor correction (PFC) and is ideal for a variety of applications, including home appliances, audio/video equipment, industrial and consumer power supplies, and switch-mode power supplies.

UCC2817DW is optimized for offline AC/DC power factor correction. The controller provides an accurate, power factor corrected current waveform to the input of an AC/DC converter and an output current that maintains the requested output power. UCC2817DW has an operating temperature range from -40 °C to +150 °C, with low-voltage PWell for low-power operation. The device also integrates an error amplifier, a comprehensive protection and isolated startup operations.

The UCC2817DW power factor correction (PFC) controller features protection features that help to regulate and protect the system in a variety of conditions. An undervoltage lockout (UVLO) is used to protect the system from input voltage below an acceptable logic level, while an internal charge pump provides intra-switching supply isolation. An active-low power-on reset control pin is available for external reset command. An overvoltage protection (OVP) ensures that the output voltage does not exceed the certified OVP level. Internal thermal overload protection and safe lifetime operation is also included.

UCC2817DW`s power factor correction (PFC) controller features a variable switching frequency that allows the output current waveform to be tuned in order to achieve higher power factor. The controller features cycle-by-cycle peak current limit and programmable average current limit that provide a consistent output current waveform. Furthermore, the controller provides an accurate, controlled power-down sequence with slow decay of the output voltage.

The UCC2817DW PFC controller provides advanced control and monitoring features that help maximize system efficiency and reduce component count. It includes an internal voltage reference for voltage loop compensation, enabling PFC converter operation independent of the load. The device also includes an accurate thermistor temperature sensing limit and programmable current sense pin and an open loop frequency synchronization pin for synchronization with other controllers. Additionally, the controller provides an adjustable start-up delay and a programmable PFC blanking window for efficient operation.

In summary, the UCC2817DW is an optimized power factor correction (PFC) controller from Texas Instruments Inc. It provides wide operating temperature range and extensive protection features, allowing it to be used in a range of applications. The device integrates advanced control and monitoring features, allowing it to achieve higher power factor and power-down sequencing with slow decay of the output voltage. Additionally, the device features an adjustable start-up delay and a programmable PFC blanking window for efficient operation.

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