UCC2807D-2

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The UCC2807D-2 is an advanced offline switcher with a power factor correction (PFC) controller included. It is designed to provide reliable and efficient power conversion in a wide range of applications, such as PCs, monitors, printers, power supplies and cordless phones. It is an ideal choice for designs that require high efficiency, low parts count and low cost.

The UCC2807D-2 is a complete AC-DC-AC control component, combining both a PFC controller and an offline switcher. The PFC controller is a high-power factor controller which uses active power factor correction to achieve near unity power factor at the input of the converter. The offline switcher is a full-featured current mode switching controller with built-in fault protection and loop compensation circuitry. It can provide excellent load response and minimal output ripple.

The UCC2807D-2 has an exceptionally wide range of operating voltage, spanning from 80VAC to 690VAC. It is designed to be tolerant of line input transients and also provides load dump protection. It is designed to work with two different types of power transformation: an active PFC front-end followed by a flyback or forward converter.

The PFC controller uses an error amplifier and comparator to compare the output voltage of the DC bus capacitor to the peak value of the input voltage. The error amplifier output is a control voltage that is used to adjust the duty cycle of the PFC switch to keep the DC bus voltage at a preset value. The PFC controller will detect overvoltage and ovecurrent conditions to prevent an unsafe condition.

The controller also includes a low frequency oscillator and protection features to regulate the current output from the PFC switch. The PFC current is limited to a peak value and the duty cycle is adjusted as a function of line voltage, line frequency and temperature.

The offline switcher section uses pulse width modulation (PWM) to control the output voltage. The PWM uses a pair of high and low voltage outputs to drive the power switches. The duty cycle of the PWM is set by the VCC and VEE reference signals. The duty cycle is controlled by an inner current loop, where the output voltage is regulated by varying the phase shift of the inner current loop.

The UCC2807D-2 also includes several protection features such as thermal shutdown, accelerated deglitching and hiccup mode to protect the device from any possible overcurrent and overvoltage conditions. It also provides a serial programming port that can be used to program various parameters such as the output voltage and current limits.

The UCC2807D-2 is an ideal choice for cost-sensitive applications that require high efficiency and tight output voltage regulation. It is a highly integrated and reliable solution for powering a variety of applications such as PCs, LCD monitors, printers, power supplies and cordless phones.

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