UCC2806PW

UCC2806PW Application Field and Working Principle

PMIC - Voltage Regulators - DC DC Switching Controllers

UCC2806PW is a high-performance, monolithic DC-DC controller designed to operate in either step-down (buck) or step-up (boost) conversion modes. It operates over a wide range of input voltages, from a minimum of 2.5V to a maximum of 30V. It is a highly efficient device that provides an accurate level of output voltage, with minimal load and line transients.

The UCC2806PW can be used to drive two N-channel MOSFETs to provide the conversion in either boost or buck configurations. The controller incorporates a synchronous rectifier, which provides excellent efficiency over a wide range of operating conditions, and increases the ECM performance of the system. It also features a rich set of features such as soft-start, frequency programming, and output voltage settings with a 5-bit DAC, that can allow for optimized system performance.

UCC2806PW is a versatile device, and can be used in a wide range of applications. It has been designed for a wide range of DC-DC converters such as those used in notebook PCs and other handheld devices, telecom equipment, battery charging, and various other power applications. Additionally, it has been designed to meet the stringent size and power requirements of automotive applications and a variety of consumer electronics applications.

Principle of Operation

The UCC2806PW is a self-oscillating controller that does not require an internal clock or an external voltage reference to regulate the output voltage. The device senses the output voltage and states of the two MOSFETs and modulates the pulse width accordingly. The UCC2806PW has two distinct current control loops: one for generating the modulation of the pulse width and another for regulating the output current.

The device uses a "current-mode" controller to generate the pulse width modulation. It senses the peak inductor current and adjusts the pulse width accordingly. This enables the device to respond quickly and accurately to changes in the load, providing tight load and line regulation. The current control loop also increases circuit stability and reduces the possibility of high ripple currents.

The second control loop regulates the output current by integrating the feedback voltage and comparing it against the reference voltage. This loop controls the duty cycle and in turn regulates the output voltage. The addition of the second control loop helps to reduce system component stress, increase total efficiency, and reduce output voltage ripple.

Benefit of Using UCC2806PW

Using UCC2806PW provides a number of advantages. As it is a monolithic device, system cost is significantly reduced by eliminating the need for an external voltage reference and clock source. The device has a low quiescent current that can reduce overall system power consumption and help increase the battery life of portable applications.

In addition, the device is designed with an internal soft-start function that helps reduce the inrush current at start-up to improve reliability and system noise. Additionally, the device offers excellent line and load regulation and good transient response.

UCC2806PW is capable of operating in either buck or boost configuration, making it suitable for a wide range of applications. The device also features a 5-bit DAC, which can be used to set the output voltage, making it possible to adjust the output voltage from 0.8V to 5.2V. This makes it ideal for applications where the output voltage needs to be adjustable.