STEVAL-ISA071V2

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The STEVAL-ISA071V2 is a multi-output, high power density, compact off-line switching mode power supply (SMPS) evaluation board. It is designed for use in a wide variety of industrial and consumer applications from medical imaging to networking and communications equipment. It features multiple outputs with configureable current and voltage, adjustable start-up times, over-current protection, and constant current and constant frequency control.

The STEVAL-ISA071V2 utilizes a quasi-resonant SEPIC (Single Ended Primary Inductor Converter) topology with power factor correction (PFC) to achieve a high efficiency and low-cost high-output power supply. The output of the board is capable of delivering up to 12.5A at 5V, 12.2A at 12V, and 2.1A at 24V. The operating frequency is user-adjustable in the range of 60 kHz - 400 kHz.

The STEVAL-ISA071V2 has been designed with safety features such as short-circuit protection, over-voltage protection, and over-current protection. The board also features current sense and voltage sense, providing improved operating efficiency and power factor. The board is UL60950-1 compliant, ensuring compliance with the UL safety standards for off-line power supplies.

The STEVAL-ISA071V2 evaluation board integrates controllers, FETs, and other key components to minimize the external component count and reduce board space while delivering the highest levels of power efficiency and reliability. The board features a range of onboard connectors and indicators, making it easy to evaluate and test the performance of the board. The board is also fully programmable, allowing users to customize performance settings for their application.

The STEVAL-ISA071V2’s working principle is based on the SEPIC topology, in which the power is split between two stages. In the first stage, the AC input voltage is rectified and filtered. The rectified voltage is then converted to a DC voltage, which is then further refined and regulated in the second stage. The output of the second stage is then split between the multiple outputs and a controller is then used to control and regulate the output voltage and current.

To maximize efficiency, the STEVAL-ISA071V2 uses a constant frequency, variable duty cycle control technique. This technique helps to prevent switching noise and losses, resulting in an efficient and reliable power supply. The output voltage and current can be fine-tuned by setting the parameters of the regulators in order to achieve a precise performance. In addition, the board has built-in over-current and over-voltage protections, to ensure safe and reliable operation.

The STEVAL-ISA071V2 is a versatile off-line SMPS evaluation board that is designed for use in a wide range of industrial and consumer applications. It features multiple outputs with configurable current and voltage, adjustable start-up times, over-current protection, and constant current and frequency control. It is a cost-effective solution for high-power applications, providing high efficiency, low ripple, and reliable operation.

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