IWD4812

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DC/DC converters are a type of power converter that are designed to convert a direct current (DC) input into a higher or lower output DC voltage. A wide variety of different types of converters are available, and IWD4812 is one such device. This article will discuss the application field and working principle of IWD4812.

Application Field

IWD4812 is a wide-input, low-profile non-isolated DC/DC converter. It is designed for use in a wide variety of applications, such as computers, metering, automation and alarm systems, lighting, audio/video systems, and instrumentation. It is suitable for both commercial and consumer applications. Its wide 6:1 input voltage range (4.5V to 28V) makes it suitable for a variety of power sources including rechargeable batteries, AC/DC adapters and wide-input DC supplies. It can operate from -40°C to 85°C, and is available in compact packages optimized for tight spaces such as hand-held applications. It is also RoHS compliant.

Working Principle

IWD4812 operates as a standard DC/DC converter, converting a direct current (DC) input into a higher or lower DC output voltage. It uses synchronous rectification and DOES regulation to maintain high efficiency, while a special adaptive loop compensator ensures that the DC output is stable and reliable. The regulator’s output voltage is monitored by an internal voltage monitor that provides a digital output to signal when the output is within a predetermined voltage window.

The converter uses a two-stage design. During the first stage, power is transferred from the input voltage through two series-connected MOSFET switches. During the second stage, the power is transferred to the output through a low-resistance synchronous rectifier. As the input voltage varies, the two MOSFET switches adjust the duty cycle to maintain a constant output voltage.

The IWD4812 also includes a variety of features designed to improve efficiency and reliability. It incorporates protection features such as over-voltage protection, thermal shutdown, and a pulse-by-pulse current limit that limit the current flowing through the DC/DC converter. Additionally, it provides integrated over-current and over-temperature protection with automatic retry sequencing.

Conclusion

In conclusion, IWD4812 is a wide-input non-isolated DC/DC converter with a wide 6:1 input voltage range (4.5V to 28V), making it suitable for use in a variety of applications. It utilizes synchronous rectification and DOES regulation to ensure high efficiency, while its intelligent protection systems improve reliability and provide protection against over-voltage, over-current, and over-temperature.

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