STEVAL-ISA010V1

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The STEVAL-ISA010V1 evaluation board from STMicroelectronics is part of their line of evaluation boards in the DC/DC & AC/DC (Off-Line) SMPS category. The unit is engineered to allow users to quickly evaluate ST automatic half-bridge Power Factor Correction (PFC) and other features. It showcases many of the features of the typical SMPS, providing a hardware foundation that makes it easier and faster for designers to evaluate potential applications of the STMicroelectronics SMPS control ICs.

The board includes a power supply applied at the line-input terminal, a half-bridge driver, a heatsink-mountable Isolation Smart gate driver, and a 3-way output port for attached loads. It also offers an RS232 digital interface for communications between the control and facilitates integration of the interface, an integrated over-voltage detection and protection circuit to protect the output for over-voltage trips, and an Inrush Current Limiter (ICL), which limits inrush current to protect the output from overloading.

The board also features ST\'s ACE technology, a feature that optimizes the PFC output voltage at line drop conditions. The ACE technology optimizes the behavior of the line-drop compensation algorithm by sampling the load current and adjusting the sensed voltage to match the load current. This makes the output more consistent and predictable, which helps to reduce system complexity and design time.

As far as the working principle of this evaluation board is concerned, the main focus is on power factor correction. Power factor correction is a process wherein a power supply takes the input voltage at varying frequencies and rounds it up to a constant supply voltage at the output. generally, the voltage variations cause the power factor of the AC input to the SMPS to be less than one. This results in increased current consumption, less efficient operation, and decreased power system efficiency.

To increase the power factor, the power supply takes the non-sinusoidal input voltage and provides a corrected output voltage that is in-line with the sinusoidal shape. In other words, it is designed to deliver a desired current waveform, conforming to that of an ideal sinusoidal input waveform. By correcting this waveform, not only is the power factor increased but it also provides efficient operation and increased system efficiency.

The STEVAL-ISA010V1 incorporates ST’s Automatic Half-Bridge (AHB) Zero Current Detection (AHB-ZCD) power factor correction ICs. These ICs sense the rectified line voltage and are used to adjust the timing for the switching of the half-bridge to a sinusoidal wave. This feature eliminates the need for any extra compensation circuits, thus making the system simpler and less expensive. The AHB-ZCD ICs also work to match the load current with the voltage waveform to maximize system efficiency and power factor.

Overall, the STMICROELECTRONICS STEVAL-ISA010V1 provides a complete evaluation platform to evaluate the ST automatic half-bridge power factor correction ICs in combination with a wealth of features. This makes it an ideal platform for designers and engineers who are looking for a quick and easy way to evaluate the applications of SMPS control ICs, making it a reliable and economical choice for SMPS designs.

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