DC2263A-A

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The DC2263A-A evaluation board from Texas Instruments is a starter board specifically designed to evaluate 9V to 36V non-isolated dc-to-dc converters in an off-line power supply topology. This board is a flexible platform for exploring several different designs and is an excellent starting point for those just beginning to experiment with offline power conversion. This article will cover the application field and working principle of the DC2263A-A board.

The DC2263A-A board is primarily used for evaluation and development of step-down converters in hard-switched and full-bridge topologies. With the integrated LCD display, users can easily view the voltage and current readings during different conversion stages. The board is also equipped with a selector for different voltage settings, allowing users to vary the desired output voltage without the need for external components or interference from outside sources. It additionally provides the necessary circuit protection features for reliable operation, including over-temperature protection and open loop protection.

The board features a DPAK-packaged PowerPACT power MOSFET as the main power switch. This power MOSFET is connected to the secondary side of the control winding and provides switching control to the output stage. The board employs an integrated flyback transformer for power conversion, whose primary side is directly connected to the output of the MOSFET. Additionally, an external synchronous rectifier is connected to the secondary side of the transformer, allowing reverse current flow through it and improving efficiency.

The primary function of the board is to provide power conversion from an unregulated input voltage to a regulated output voltage. This is achieved by controlling the switching frequency of the MOSFET, which in turn, regulates the output voltage. The board implements a pulse width modulation (PWM) scheme for controlling the MOSFET, with the MOSFET\'s gate connected to the PWM and the output voltage connected to the feedback input of the PWM. When the output voltage is too low, the PWM increases the duty cycle, which increases the frequency of the MOSFET, which in turn increases the output voltage. This process is repeated until the desired output voltage is reached.

The board features several protection features such as over-temperature shutdown, open-loop protection for both input and output, and a built-in current limiter. The current limiter is used to prevent excessive current flow through the MOSFET, thereby preventing overheating or damage to the MOSFET. In addition, the board also features current sensing and over-voltage protection.

Overall, the DC2263A-A evaluation board from Texas Instruments provides an excellent platform for users to develop and evaluate innovative non-isolated dc-to-dc converter designs in an off-line power supply topology. Its integrated LCD display, voltage selector, protection features, and integrated flyback transformer and synchronous rectifier make it an ideal choice for users who want a flexible, easy-to-use, reliable board. The board also provides the user with the necessary features for reliable, optimized operation, such as over-temperature shutdown and open-loop protection.

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