UC3854ADW

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UC3854ADW is a line of high-performance power factor correction (PFC) controllers from the portfolio of Texas Instruments. It is a low-cost, easy-to-use PFC solution, ideal for mid-power PFC designs. The device provides a complete PFC function in the majority of global power applications, from 50 W to 1 kW.

The UC3854ADW device is a high-speed, low-power CMOS current-mode PFC controller with built-in PWM control. It is designed for use in single-stage discontinuous-conduction mode (DCM) PFC systems up to 1 kW. The UC3854ADW device features a differential voltage sense input, voltage and current feedback control, cycle-by-cycle current limit, and an on-board synchronous rectifier driver. Internal defect and under-voltage lockout provide protection while soft start, PLL synchronization, and brown-in/brown-out detection offer greater system usability.

The UC3854ADW controller has two operating modes: constant-frequency/constant-voltage (CF/CV) and quasi-resonant (QR). The CF/CV operating mode offers the best performance for PFC applications, while the QR mode is provided for compliance to standards requiring true-sinewave inrush current limiting. In either mode, the UC3854ADW controller incorporates comprehensive control to provide the highest power factor and load regulation. The QR mode also senses load transients and automatically adjusts operation to ensure proper inrush current limitation without affecting the load dynamics.

The UC3854ADW controller is ideal for a wide range of applications including PCs, laser printers, and other white goods. The device is ideal for applications that need to meet EN61000-3-2 and NEC/UL requirements including harmonic current attenuation (HCA), power factor (PF), and harmonic current (HC). In addition, the device offers enhanced system immunity to conducted and radiated interference.

The operation of the UC3854ADW controller is based on its use of current mode control. This allows the controller to measure the total instantaneous current drawn by the power supply and maintain the set value of current. The controller then adjusts the operating frequency to regulate the peak current and avoid saturation of the transformer as a result of the current mode control.

The PFC converter is equipped with a peak current-limit circuit to ensure adequate protection from excessive inrush current. The peak current limit function is enabled or disabled by an external pin. The correction of the input power factor is possible through the use of a process commonly known as feed-forward control. This process makes use of the measured input voltage to adjust the switching frequency of the PFC converter in such a way that the converter operates in a continuous conduction mode.

The UC3854ADW controller also includes an on-board rectifier controller to provide synchronous rectification and reduce switching losses. This is achieved by allowing the rectifier to be in full conduction while the PFC converter is in its periodic conduction state. The UC3854ADW also provides brown-in/brown-out detect and soft start features, eliminating the need for an additional control IC.

The UC3854ADW PFC controller also offers additional features to enhance system performance. These features include Reduce-Ripple Shutdown and Enhanced Fast-Response. Reduce-Ripple Shutdown reduces the ripple voltage in the bus voltage once the system has been shut down to maintain the increasing power dissipation levels in system shutdown. EnhancedFast-Response improves fast-transient response by reducing the output voltage compensation time.

In summary, UC3854ADW is a simple and cost-effective solution for power factor correction (PFC) designs. The device provides a complete PFC function in the majority of global power applications, from 50 W to 1 kW. It is a low-power, high-speed CMOS current-mode PFC controller with built-in PWM control esigned for use in single-stage DCM PFC systems. The device offers comprehensive control to provide the highest power factor and load regulation. Moreover, it features Reduce-Ripple Shutdown, Enhanced Fast-Response, and brown-in/brown-out detect features to improve system performance. The UC3854ADW controller is a great choice for applications that need to meet EN61000-3-2 and NEC/UL requirements.

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