UCC28710DR

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Power management integrated circuits (PMICs) are designed to make the management of power supplies, both direct current (DC) and alternating current (AC) more efficient and reliable. Within the PMIC family, an AC to DC converter, such as the UCC28710DR, is an integrated circuit that transforms an alternating current source into a direct current source. Offline switchers are an ideal designs, enabling high efficiency and low noise output.

The UCC28710DR is a fully integrated offline converter for AC to DC conversion built on a 45nm CMOS process. The UCC28710DR features low quiescent current, high integration, internal protections, and a low sense voltage (Vsense) to enable state of the art efficiency performance.

The application areas of the UCC28710DR can vary, given its efficiency, cost and size. Its design enables it to be employed in commercial, consumer and industrial applications, such as in low power adapters, notebook adapters, battery chargers, LCD/LED TV, home appliances, and mobile phones.

In terms of its working principle, the UCC28710DR is ideal for a wide input voltage range (90Vac – 265Vac), and integrates PFC, valley switch and half bridge topology, enabling very high power density designs and simple control loop compensation.

The UCC28710DR combines a peak current-mode control-PWM power factor control (PFC) controller with a valley-mode PFC controller, on-time valley generator, a high side/low side power MOSFET driver, Vcc detectors, and four-level active burst mode circuits. All of these components enable the device to operate from a wide input voltage range while the valley mode control reduces the circulating current losses and increases the overall efficiency of the converter.

The built-in PFC design of the UCC28710DR regulates an input voltage to within a specific range, allowing high efficiency with consistent performance. The peak current-mode control (PCM) PFC controller features a 125 kHz frequency control, allowing smooth and fast transient response, while the Valley Mode PFC Controller (VMPC) designs upper turn-on frequency of 700 kHz, allowing fast line voltage transients.

The UCC28710DR has a High Side/Low Side power MOSFETS driver circuit. This provides the necessary structure to reduce switching loss and to increase system efficiency. The on-time valley generator adjusts the valley conduction angle accordingly, reducing the valley current ripple for improved efficiency and more consistent performance.

The UCC28710DR features an internal PWM controller with four-level active burst mode circuit. It controls the primary switch without an external controller, or an external sense resistor, while the active burst mode enables higher efficiency in light load conditions. Lastly, its low Vcc detector is ideal for low power applications, providing an improved power saving mode.

When the UCC28710DR is in a stand-by condition, its quiescent current drops to 10 μA, enabling very energy efficient solutions. It also has an integrated Over Voltage Protection (OVP) and Over Current Protection (OCP). This ensures continuous safety monitoring of the device and prevents any damage due to overloads.

In conclusion, the UCC28710DR is an integrated AC to DC converter capable of transforming an AC source into a direct current source. Its low quiescent current, high integration, internal protections, and low sense voltage make it suitable for applications such as in low power adapters, LCD/LED TV, home appliances and mobile phones. Its PFC design, Peak Current Mode control and Half Bridge Topology work together to increase the efficiency and reduce losses, while the internal protections help to prevent damage due to overloads. The UCC28710DR is a versatile, cost-effective and energy-efficient offline switcher.

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