UCC28250EVM-564

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Texas Instruments UCC28250EVM-564 is a highly advanced Evaluation Module (EVM) configured to help engineers evaluate a wide range of power-conversion functions. Specifically designed for the UCC28250 integrated circuits, the board is used to evaluate features including high-voltage start-up, line undervoltage/overvoltage protection, peak current mode control, low-power modes, and hysteretic control. This article will discuss the application field and working principle of The UCC28250EVM-564.

The UCC28250EVM-564 is ideally suited for evaluation of off-line power-supply solutions. The board is designed for universal AC input with automatic Power-Factor Correction (PFC) and incorporates a DC/DC buck type forward converter design. Additionally, the EVM supports 8 to 265 VAC input, up to 280 W of output power, and an output voltages ranging from 0 - 380VDC. This makes the UCC28250EVM-564 applicable for PFC-prereg, PFC+DC/DC transformer based, as well as non-isolated DC/DC applications. It is also suitable for low-power, energy efficient systems due to its low standby power requirements. This makes it an excellent choice for high-performance, low-cost AC/DC power-supply designs.

The working principle of the UCC28250EVM-564 is based on the UCC28250 Integrated Circuit (IC). The IC offers a complete control solution for energy-efficient, cost-effective half-bridge PFC prereg, DC/DC forward converter, and non-isolated buck regulator topologies. It integrates two full-bridge MOSFET drivers, while also providing current sensing, over-voltage protection (OVP), current-mode control, and low-power operational modes. The board is equipped with a control and input-voltage reference section, which is used to set up the desired operating point. The board also includes several protections, such as Over-Temperature Protection (OTP), Under-Voltage Lockout (UVLO) and Over Load Protection (OLP). The main components of the board are: the UCC28250 IC, a rectifier bridge, an isolation transformer, an optocoupler, a pull-up resistor, and a current-sense transformer.

The UCC28250EVM-564 has three main operating modes: the standby mode where no power is consumed; the operation mode where the device is powered and the IC adapts to the desired output voltage; and the shutdown mode, where the IC and all external components are powered off. The EVM is designed to operate from 8 to 265 VAC input and is capable of delivering up to 280 W of output power. The board has a peak current-mode control circuit, which allows for stability and fast transient response. The board also has built-in over-voltage protection. The board features a fast high-voltage start-up circuit that offers fast start-up times and reliable operation in a wide range of input voltages.

The UCC28250EVM-564 is an excellent choice for evaluating a variety of DC/DC and AC/DC off-line power supply designs. The board is easy to set up and has a wide range of applications, including high-power systems, energy-efficient systems, power-conversion applications, and more. It offers high power efficiency, fast start-up times, and built-in protection features, making it an ideal choice for evaluating DC/DC and AC/DC off-line power supply designs.

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