ALQ50Y48N

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DC-DC converters offer a wide range of standardized solutions for the application of power electronics in both the industrial and consumer markets. ALQ50Y48N is a particular model that is a synchronous, wide input range high efficiency DC-DC buck (step-down) converter. Its features, operation, and applications are discussed in this article.

Features and Electrical Specifications:

The ALQ50Y48N has a 4:1 input voltage range of 16V to 75V and a fixed, regulated output of 3.3V. It has a maximum output power rating of 50W and a 12A continuous output current capability. Its switching frequency is adjustable from 200kHz to 500kHz, allowing for precise output voltage regulation and thermal performance optimization.

The converter is equipped with a non-latching current limiting feature, which allows it to be protected against short circuit and overload conditions. It also includes an adjustable soft start and synchronized enable, as well as a programmable OVLO (Over Voltage Lock Out) and UVLO (Under Voltage Lock Out) thresholds. All these features guarantee reliable operation and long term durability.

The device has a number of other features, including an integrated input filter, a low quiescent current, an on/off control, a trim pot for fine adjustments, and an enable pin for power sequencing. Furthermore, the ALQ50Y48N has various protections such as thermal foldback, over current, short circuit, and over temperature protection.

Working Principle:

The ALQ50Y48N is a synchronous buck converter, which means it uses a pair of transistors hooked up in an H bridge configuration to convert a high input voltage into a lower output voltage. This is achieved through a process called duty-cycle modulation, whereby the voltage is switched on and off at a specific frequency, regulated by a pulse width modulation (PWM) signal.

The PWM signal is generated by an integrated control circuit, which monitors the output voltage and adjusts the duty cycle accordingly. This ensures that the output remains stable and within the specified limits. During normal operation, the transistors are switched rapidly, with each switching event producing a pulsed output voltage with a mean value equal to the desired output voltage.

Application Field:

The ALQ50Y48N is suitable for a wide range of applications, such as those in the industrial, automotive, telecommunications, and consumer markets. It can be used in telecommunications, computers, and other networking systems, as well as in automotive electronics, UPS systems, motor drive systems, and renewable energy systems.

Due to its high efficiency and long-term stability, the ALQ50Y48N is also widely used in portable and power limited electronics, such as laptop power adapters, notebook computers, and medical equipment.

Conclusion:

The ALQ50Y48N is a robust and reliable DC-DC buck converter from ALQ Industries, featuring a wide input voltage range, a programmable output voltage, and an adjustable switching frequency. It is suitable for many applications, including automotive, telecommunications, consumer electronics, industrial, and power limited scenarios. Its extensive protection features ensure reliable operation and long-term durability.

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