UCC3626DWTRG4

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The UCC3626DWTRG4 is a monolithic, power factor controller intended for use in energy-efficient, high-reliability, high-accuracy offline converters operating at frequencies up to 150 kHz. It combines a leading-edge, fixed-frequency current mode PFC controller with a unique, easy-to-use analog current-control-loop block, providing a comprehensive closed-loop control solution for single-stage, high-power AC/DC converters. The integrated phase-shift-modulator feature minimizes input-to-output capacitive coupling and a peak-current-mode–based over-current protection eliminates the need for an external snubber circuit. Inverter operation is supported by an independent active-clamp reset transistor integrated on-chip.

The operating principle for the UCC3626 is based on the standard power-factor-correction (PFC) technique, which is a technique for maintaining a constant AC power factor as the output voltage of a power source fluctuates. This technique utilizes a power transistor and a feedback control circuit to regulate the current drawn from the input-source line. When the current drawn from the line increases, the power transistor is turned off, causing the voltage on the input-source line to decrease. Similarly, when the current drawn from the line decreases, the power transistor is turned on, causing the voltage on the input-source line to increase. The power transistor is typically pulsed in such a manner that the input power factor is maintained at or near unity, which allows for greater efficiency and improved performance for the circuit.

The UCC3626 utilizes a state-of-the-art current-mode boost regulator, which provides constant input power-factor correction and significantly reduces the component count on the main switching section of the system. It also provides a host of important safety features, including power factor correction and peak current sensing, as well as AC line-high under-voltage lockout. The UCC3626 also includes an integrated reset transistor, allowing for inverter operation, as well as an adjustable oscillator circuit to achieve precise current mode control up to 150 kHz. This controller is used in a wide range of AC/DC power converter applications, such as ac-dc power supplies, stand-by/no-load power supplies, server power supplies and auxiliary power slots.

In conclusion, the UCC3626DWTRG4 can be categorized as a motor driver, controller and power-factor-correction controller for use in a range of AC/DC power applications, including ac-dc power supplies, stand-by/no-load power supplies, server power supplies and auxiliary power slots. This controller provides efficient, high-accuracy power-conversion control, as well as advanced safety features. It is designed to operate at frequencies up to 150 kHz and its integrated phase-shift-modulator feature minimizes input-to-output capacitive coupling. It also features a peak-current-mode–based over-current protection and an integrated reset transistor for inverter operation. This makes it an ideal choice for applications that require high-reliability, efficient power conversion control.

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