ISL8117DEMO2Z

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The ISL8117DEMO2Z is an evaluation board designed foe DC/DC and AC/DC (off-line) SMPS, allowing users to effectively evaluate the performance and features of the ISL8117 device

The ISL8117DEMO2Z is a cost efficient system designed for powering DC/DC and AC/DC (off-line) SMPS based on the ISL8117 device. The ISL8117DEMO2Z is an easy to use and flexible platform, allowing quick prototyping as well as the evaluation of various scaling functionality, fault protection features, and the flexibility of the device\'s parameters. The product supports up to 9A of continuous output current. This application report is aimed at providing a detailed overview of the ISL8117DEMO2Z application field and its working principle.

Application Field

The ISL8117DEMO2Z demonstrates the capabilities of the ISL8117 device, designed for powering AC and DC input voltage based SMPS applications. It is a cost effective platform that enables users to evaluate high-performance offline SMPS solutions. The application report provides an application field overview of the ISL8117DEMO2Z board and its working principle.

Working Principle

The ISL8117DEMO2Z is a cost-efficient platform that demonstrates the capabilities of the ISL8117 device and its features. The ISL8117DEMO2Z evaluation board is driven by an ISL8117 device, allowing for users to assess its scaling features, fault protection capabilities, and various parameters. The ISL8117DEMO2Z board features the ISL8117 device in a 2-Switch Flyback topology.

The 2-Switch Flyback topology is primarily used in the design of AC/DC power supplies, and is suitable for applications where the output voltage is regulated with a feedback loop. Utilizing the 2-Switch Flyback topology, an operation can be maintained where the total input current is lower than the output current – making it suitable for low-power, high-current applications. The primary winding of the transformer contains a single switch, which is switched to connect the primary winding of the transformer to the input voltage source.

The design of the ISL8117DEMO2Z is an open-loop system. Open-loop systems lack feedback signals, and instead rely on user-set reference values that define the behavior of the circuit. In the open-loop system of the ISL8117DEMO2Z, the reference value is defined by the voltage rating of the transformer used on the evaluation board, and the duty cycle of the two switches, the FET and diode, is determined by the reference.

The second switch on the ISL8117DEMO2Z is a recirculation diode. Its purpose is to recirculate current from the Flyback converter’s secondary winding back to the primary winding while the switch is open. This significantly reduces the peak current seen across the primary winding and ensures that the converter operates in an efficient manner.

In order to regulate the output voltage of the ISL8117DEMO2Z, a volt-second balance circuit is used to dynamically adjust the duty cycle of the power stages. The volt-second balance circuit keeps the output voltage constant, regardless of load conditions or input voltage fluctuations.

The ISL8117DEMO2Z is also equipped with a variety of features such as an adjustable current limit and a thermal shutdown. The adjustable current limit is designed to prevent any excessive current from being drawn from the output during start-up, or when a fault occurs. The thermal protection circuit will shut down the device if the internal temperature exceeds a predetermined threshold, in order to protect the device from damage.

Conclusion

The ISL8117DEMO2Z is an effective and flexible evaluation board for DC/DC and AC/DC (off-line) SMPS applications. It is a cost efficient platform which allows users to evaluate, prototype, and assess the features and performance of the ISL8117 device. This application report provides an overview of the evaluation board’s application field and its working principle. The ISL8117DEMO2Z board is an ideal platform for power supply designers who are looking to quickly and effectively prototype and assess their design.

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