DFR0250

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The DFR0250 evaluation board aims to demonstrate the working and features of a two-phase interleaved asynchronous buck regulator. It is a user-friendly development board that facilitates fast testing and evaluation of the STMicroelectronics TAP1802 power controller. It includes the components necessary for a two-phase, single rail regulated power supply, and is designed for offline, DC/DC and AC/DC applications.

The board is composed of a main board that contains a TAP1802 integrated power controller and other components. The main board also contains the control components necessary for two-phase interleaved control and the connections necessary for connecting a power transformer. The evaluation board also contains two daughter boards, which can be connected to the main board to complete the power supply.

The main board is equipped with contacts for inrush current limit resistance and thermal protection. It has a level 3 reset pin and a soft start pin. The daughter board has the contacts necessary for connecting the power transformer primary and secondary coils, as well as a connection for the auxiliary winding to provide bias. It also includes the necessary components for inrush current limit and over voltage protection.

The two-phase interleaved control model used by the evaluation board provides a high power density and simplicity in design, as the control needs to be implemented only once on the main board. The control loop bandwidth is adjustable according to the requirements of the circuit, and the board provides a simple way to achieve optimal performance.

The evaluation board has a low quiescent current, low noise, constant frequency oscillator, which can operate from a wide range of input supply levels. The power MOSFETs used to switch the output voltage are rated for 34V and can be paralleled for higher current outputs. The power supply is also protected against overvoltage and inrush current.

The evaluation board also includes comprehensive test points, which can be used to monitor the operation of the board and the waveforms of the switching components. It also includes contour plots of operating window of the switches, as well as efficiency and power factor, which can be used to assess the performance of the power supply.

The evaluation board is ideal for designing and testing an efficient, reliable, two-phase, single rail power supply for a variety of AC/DC and DC/DC offline applications. The board includes a comprehensive set of testing points to monitor the performance of the power supply, and the two-phase interleaved control model provides high power density and simplicity in design.

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