ACT8945AEVK1-305

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The Act 8945AEVK1-305 evaluation board is an off-line switch-mode power supply (SMPS) for DC/DC and AC/DC applications. It is designed to use a wide input voltage range from 85 to 305 VAC to control output voltages from 3.3 to 15 V. This board offers various safety features, such as input overvoltage protection (OVP) and output overcurrent protection (OCP). The maximum current output is 5A. The board also provides excellent EMI and EMC compliance.

The main components of the board include the input voltage protection module, a boost PFC conversion stage, the controller and MOSFET phase-shifted full-bridge resonant converter, the output voltage regulation and filtering, and the inductor filter. The basic working principle is as follows. The input voltage module consists of a rectifier, a vector modulator, and a protection device. This module converts the AC input voltage to a DC voltage, which is then used for the input of the PFC conversion stage. The PFC stage converts the DC input voltage to a higher voltage level which is then used to drive the MOSFET half-bridge and full bridge resonant converter.

The MOSFET half-bridge and full bridge resonant converter, in turn, will control the output voltage and current of the SMPS. This is achieved by adjusting the frequency of operation of the MOSFET. The controller can be programmed to change the frequency of operation depending on the load conditions of the system, so as to maintain the desired output voltage and current. The output voltage is then regulated and filtered by the output voltage regulation and filtering module. Finally, an inductor filter is used to remove any remaining noise from the output waveform.

The Act 8945AEVK1-305 evaluation board is a versatile, cost-effective solution for DC/DC and AC/DC power supplies. It offers a wide input voltage range, excellent EMI and EMC compliance, and several safety features. It is also well suited for applications such as motor drives, power adapters, consumer electronics, and industrial power supplies. The combination of the components and the wide input voltage range of the board make it an ideal solution for many off-line switch-mode power supply applications.

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