STEVAL-ISA104V1

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The STEVAL-ISA104V1 is an evaluation board designed to assist engineers in the development and testing of off-line switching mode power supplies (SMPS). It is intended to provide a ready-to-use platform for system designers in making and testing a range of power supply systems. The board incorporates a TEA1721L component which is capable of delivering up to 4A output current, when configured correctly.

The evaluation board optimises the usage of MOSFETs in off-line SMPS configurations. It utilises a unique circuit topology called a Z-type configuration. This configuration effectively combines the functions of the primary and secondary side components, and hence reduces the bill of materials (BOM) required for a typical SMPS application. The component is suitable for both DC/DC and AC/DC off-line SMPS applications.

The evaluation board has been designed with flexibility in mind. It has a wide input voltage range of between 9V and 36V, with an adjustable output voltage. This makes it suitable for a wide range of application fields, including automotive, consumer, lighting, LED, industrial, and medical equipment. The board also has a wide operating temperature range of -40°C to +85°C which ensures reliable operation in a variety of environmental conditions. Additionally, the evaluation board comes with a graphical user interface (GUI) which allows users to easily test and adjust different parameters, such as duty cycle, PWM frequency, and soft start.

In terms of the working principle of the STEVAL-ISA104V1, it works by using an advanced Z-type SMPS configuration. This configuration combines the primary and secondary side components in order to reduce the overall bill of materials (BOM) required for the application. The board uses a standard frequency modulation technique, known as pulse width modulation (PWM), to control the switching of the MOSFETs. The duty cycle of the PWM signal is set by an adjustable control voltage which ensures that the power is delivered to the load correctly and efficiently. Furthermore, the evaluation board incorporates soft start and input dynamic voltage scaling (IDVS) circuits, which help reduce the inrush current at start-up and allows for accurate input voltage adjustment, respectively.

The STEVAL-ISA104V1 is a versatile evaluation board which can be used for a wide range of off-line switching mode power supply applications. It utilises a unique Z-type configuration which effectively combines the primary and secondary components, and thus reduces the BOM required for the application. Furthermore, it offers a wide input voltage range, adjustable output voltage, wide operating temperature range, and user-friendly graphical interface for testing and adjustment of parameters. As such, it is an ideal platform for system designers in making and testing a range of SMPS systems.

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