UCC2839D

UCC2839D Application Field and Working Principle

The UCC2839D is a highly integrated circuit designed for use in multi-phase interleaved applications. It is a full featured, high voltage current mode, primary side control, high frequency offline switcher controller with integrated driver. These features make the UCC2839D well suited for both synchronous and asynchronous buck and boost topologies with power levels up to 650W. The UCC2839D provides a variety of features for controlling a synchronous or asynchronous buck or boost converter, including current mode control, over voltage protection features, thermal protection features, and advanced loop compensation components.

The UCC2839D supports both synchronous as well as asynchronous buck and boost converters. In synchronous buck converter configurations, the device provides support for two phases with a maximum output power of 650W. For asynchronous boost converters, the device is capable of up to four phases and a maximum output power of 650W. The UCC2839D supports a wide input voltage range of 10V to 500V and offers a variety of options to control the respective load current. The integrated gate driver provides up to 500V of gate drive voltage and can drive MOSFETs with peak currents up to 14A, making it ideal for high frequency, high power applications.

When configured for primary side control, the UCC2839D provides an accurate, low cost solution for powering various loads. By allowing the controller to sense the input voltage, the output regulation is performed on the primary side, greatly reducing component count and cost. Furthermore, the UCC2839D features several features which provide the controller with robust protection from faults and other abnormal operating conditions. This includes over voltage protection, current sense protection, temperature monitoring and thermal shutdown, as well as integrated loop compensation components.

Working Principle of UCC2839D

The UCC2839D is a high voltage current mode, primary side control, high frequency, offline switcher controller with integrated driver. It utilizes a constant on-time control scheme for regulating the output voltage across the output inductor by controlling the duration of each switching cycle. The UCC2839D operates in constant on-time mode or peak current mode, depending on the capacitor divider network on the feedback voltage. The constant on-time control scheme utilizes the slope compensation of the current or voltage ramp to provide a stable output. The UCC2839D operates in current mode and adjusts its switching period based on the sensed current and the programmed current limit.

The operation of the UCC2839D is determined by the feedback voltage, input voltage and current sensed. The higher the input voltage, the more time the converter needs to bring the output voltage to the desired level. The UCC2839D adjusts the on-time of the switching cycle and the current level to regulate the output voltage. The UCC2839D also provides over and under voltage protection, current sense protection, and thermal protection. If a fault condition is detected, the UCC2839D will automatically shutdown the converter. The UCC2839D also provides integrated current-mode loop components, enabling it to respond to dynamic load conditions.

The UCC2839D is ideal for powering a variety of loads from 10V to 500V, including computer and server applications, power supplies, portable electronics, and industrial applications. Thanks to the UCC2839D’s integrated features, including over and under voltage protection, current sense protection, and thermal protection, it can provide robust protection from faults and abnormal operating conditions. In addition, the device supports two-phase and four phase synchronous and asynchronous buck and boost converters and is capable of driving MOSFETs with peak currents up to 14A, making it suitable for high frequency, high power applications.