ISL85415EVAL1Z

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Evaluation boards offer the ideal platform for rapidly developing and debugging power supplies with the latest processor, sensing, and control topologies. The ISL85415EVAL1Z evaluation board is designed to enable precise control and analysis of off-line SMPSs. In this article, we’ll take a look at the application field and working principle of this board.

The ISL85415EVAL1Z evaluation board is an advanced platform for the study of DC/DC & AC/DC (off-line) SMPSs. It uses a dual-mode, single-stage synchronous flyback controller/driver, the ISL85415, to convert a wide-range input AC line voltage into a regulated output voltage with high efficiency. It is designed to operate from a 90VAC-265VAC voltage input, delivering up to 1.2A @ 12V or 3A @ 5V outputs.

The evaluation board supports the SMPS operating modes of closed loop voltage mode, discontinuous conduction mode (DCM), and continuous conduction mode (CCM) with a line frequency of 50/60Hz. It offers all the measurement points for the designer to accurately perform measurements of the power supply parameters, such as the input/output power, efficiency, line/load regulation, and AC line transient response.

The ISL85415 is a dual-mode, synchronous flyback controller/driver IC. It is designed with advanced techniques to reduce the number of external components required in a power supply design, which simplifies the design process. It\'s integrated with a high-speed PWM current mode control, a high-voltage accurate voltage regulation, and a high-speed propagation delay. A patented primary loop topology is used to eliminate the need for an oversized transformer, thereby reducing the total size andcost of the design.

The operating principle of the evaluation board can be roughly summarized as follows. The board is connected to a line voltage input, which is then fed through the primary side of the flyback transformer. The switching is controlled by the ISL85415, which is used for both switching and control. The output voltage is regulated by both the LC filter and comparator circuit. The primary side of the flyback transformer transfers the energy stored in the secondary side, and the energy is transferred to the output rails through the secondary side of the flyback transformer. The output voltage is regulated through the LC filter and comparator circuits. In order to reach high efficiency, the board is designed to feature a low-ripple switching frequency and a low frequency adaptive dead-time control.

In summary, the ISL85415EVAL1Z evaluation board is designed to allow accurate and rapid design, debugging, and analysis of DC/DC & AC/DC (off-line) SMPSs. It is a cost-effective platform that facilitates the study of SMPSs and offers the advantage of fewer external components. The board offers a wide range of features, including high-speed PWM current mode control, accurate voltage regulation, low frequency adaptive dead-time control, dedicated measurement points, and more. All these features are designed to make the evaluation board a reliable and indispensable tool for rapid and accurate power supply design.

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