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A DC-DC converter is an electronic device that converts direct current (DC) from one voltage level to another. It is a type of subjecting power electronics used in solar power systems, automotive applications, portable electronic devices, and industrial power supplies. The PSR122.5-9 is a low power, synchronous step-down DC-DC converter from Murata Power Solutions that is designed for industrial applications. This article provides an overview of the PSR122.5-9 device, including its application field and working principle.

Application Field

The PSR122.5-9 is designed for applications requiring high power density and high efficiency performance. This device is ideal for automotive, industrial, and telecom applications, such as automotive electronic systems, power supplies, and telecom base station supplies. The device has an input voltage range of 4.5V to 28V, and an output voltage range of 0.6V to 5V.

Working Principle

The PSR122.5-9 device utilizes a synchronous step-down conversion topology to perform voltage conversion. The device operates in one of two modes: continuous conduction mode (CCM) and discrete conduction mode (DCM). In CCM, the inductor current is continuous and the current never drops to zero. In DCM, the inductor current is discontinuous and drops to zero periodically. In both modes of operation, the device uses a peak current-mode control method to ensure stability. The output voltage is regulated by comparing the feedback voltage with an internal reference voltage.

The PSR122.5-9’s peak current-mode control method provides several advantages. This method allows for fast transient response, fast current loop response, and a wide bandwidth. Additionally, it provides superior load regulation and allows it to be tolerant to certain line conditions. Furthermore, it eliminates the need for an external compensation network, reducing component costs and saving board space.

The device also boasts several other features that make it suitable for a variety of applications. These features include an adjustable output voltage, power-Good indicator, soft-start, output over-voltage protection, and thermal shutdown. Additionally, the device provides excellent efficiency performance, making it ideal for applications requiring high power density and high energy efficiency.

In conclusion, the PSR122.5-9 is a high power, synchronous step-down DC-DC converter designed for industrial applications. The device utilizes a peak current-mode control method to regulate output voltage, and provides several features such as adjustable output voltage, power-Good indicator, soft-start, output over-voltage protection, and thermal shutdown. Furthermore, it boasts excellent efficiency performance, making it suitable for applications requiring high power density and high efficiency performance.

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