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EVB_RT7297CHZSP application field and working principle

The EVB_RT7297CHZSP is a very versatile evaluation board designed to provide designers with the opportunity to experience the features of the RT7297CHZSP DC/DC and AC/DC off-line SMPS IC without having to design a dedicated circuit. This evaluation board is designed for use with stepped down inputs (18V to 28V) to supply a fixed output current up to 1.2A.

Application Fields

The EVB_RT7297CHZSP board is an ideal platform to evaluate the performance and effectiveness of RT7297CHZSP in powering a wide range of applications. The board is capable of providing a fixed current up to 1.2A from stepped down inputs of 18V to 28V DC with a relatively low input ripple. It can be used in applications such as notebook chargers, tablet chargers, semi-lighting applications, USB chargers, automotive charging systems, and many more. It is also applicable to multi-output applications where multiple outputs are needed at the same time.

Working Principle

The EVB_RT7297CHZSP evaluation board follows a classical step-down topology using two transistors, a diode and an LDO. The main transistor is used to regulate the frequency of the SMPS IC and is driven by a non-inverting signal from a frequency compensation pin. The diode acts as a rectifier to ensure that power is delivered to the load at the right level of power with little distortion. The LDO is used to regulate the output current and ensure there is no over-current or over-voltage.

The switching frequency is set using an external resistor, while the spread spectrum feature of the IC ensures that the output noise emission is low. It also enables a fast response time, ensuring a transient response and a superior efficiency. The differential measurement technology implemented in the IC ensures further precision while regulating the current.

In conclusion, the EVB_RT7297CHZSP evaluation board is a great tool to quickly prototype and design applications utilizing the features of the RT7297CHZSP DC/DC and AC/DC off-line SMPS IC. It is an ideal product for students and professionals in the field as it allows them to evaluate the capabilities of the IC without having to design a specific circuit. Furthermore, its ability to provide a fixed current up to 1.2A from stepped down inputs of 18V to 28V DC enables it to be used in a variety of power delivery applications.

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