UCC28514DW

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The UCC28514DW is a high performance, single-phase, continuous conduction mode (CCM) PFC integrated circuit (IC) that is capable of providing up to 2.75 A peak or 2.25 A RMS output at up to 400 V. It contains several functional components that are necessary for regulating a power factor corrected (PFC) AC/DC supply, such as a current mode boost controller, a bridgeless rectifier, a voltage regulator, and a Pulse Width Modulator (PWM). This device is especially suitable for offline applications such as IT equipment, industrial systems, and home appliances with a PFC stage in the power supply.

The UCC28514DW is used to control the inrush current into the boost input and output stages for proper load transient response. It utilizes a Zero Cross Control (ZCC) technique with a single resistor to adjust the inrush current. The operation of the UCC28514DW is divided into two stages. The first stage is the boost converter stage. It takes in an AC voltage, rectifies it, and then supplies a boosted DC voltage to the load.

The second stage is the current mode control, or PFC stage. Here, the rectified input voltage is compared to an internal reference voltage, and a Pulse Width Modulated (PWM) signal is generated. This PWM signal is used to control the conduction of the boost-inductor, such that the input current is in phase with the input voltage. This ensures that the power factor achieved is always unity and the power rectification efficiency is maintained above 90%.

The UCC28514DW works on the principle of controlling the energy stored in the boost inductor. The stored energy is transferred to the load via the output rectifier. During the control period, the device adjusts the output voltage by changing the duty cycle of the output PWM signal. The duty cycle is calculated by a Proportional-Integral (PI) compensator, using the internal feedback signals from the rectifier output voltage, the output voltage current and the inductor current.

The UCC28514DW can operate in both Constant Voltage (CV) and Constant Current (CC) mode to provide both fast load transient response as well as high power factor correction. In addition to this, the device also has multiple protection features such as input under-voltage over-voltage, output over-voltage and over-temperature. These features are used to ensure that the device operates safely in various conditions.

In conclusion, the UCC28514DW is an integrated circuit that is designed to provide Power Factor Correction (PFC) in a single phase AC/DC supply. It is suitable for applications such as IT equipment, industrial systems, and home appliances. The device utilizes a Zero Cross Control (ZCC) technique with a single resistor to adjust the inrush current, and can operate in both Constant Voltage (CV) and Constant Current (CC) mode. In addition, it also includes multiple protection features such as input under-voltage over-voltage, output over-voltage, and over-temperature protection.

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