PT79SR112H

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DC-DC converters are devices that convert a DC supply voltage into another DC voltage. They come in a variety of forms, from simple switch mode converters to complex multi-stage, multi-output topologies. One of the most common DC-DC converters is the PT79SR112H. It is a high-performance, cost effective and compact DC-DC converter that is available in a variety of output voltages and power levels.

The PT79SR112H is a single-output, high-efficiency DC-DC converter with a nominal input voltage of 24V. It has a typical output voltage of 3.3V and can support up to 15A of continuous load current. The PT79SR112H has a wide input voltage range from 10V to 24V and features input voltage reverse polarity protection. It also incorporates over-temperature and over-current protection as well as a soft start feature intended to limit inrush current during startup.

The PT79SR112H is typically used in applications such as point-of-load (POL) buck converters, 12V to 24V DC/DC converters, telecom base stations, distributed power architectures and energy-efficient industrial equipment. Its wide range of features, coupled with its cost effectiveness, makes it an ideal choice for many applications.

The working principle of the PT79SR112H is based on a synchronous rectification buck converter topology. The device will take a DC input voltage from 10V to 24V and stepped it down to the desired output voltage while maintaining very high efficiency. This is achieved using a combination of a Power MOSFET switch, a low loss Schottky diode, an inductor and a capacitor. When the MOSFET switch is on, the current will flow through the inductor and the voltage on the output is determined by the voltage drops across the switch and the Schottky diode. The output voltage can be regulated by controlling the duty cycle of the MOSFET switch. When the switch is off, the energy stored in the inductor is released into the load. The capacitor is used to filter out the ripple current.

The PT79SR112H utilizes an internal current mode, fixed frequency control loop to regulate the output voltage. This control loop senses the output voltage with an error amplifier and then adjusts the duty cycle of the switch in order to maintain a constant output voltage. The control loop also provides the overcurrent and over temperature protection features.

In summary, the PT79SR112H is a highly capable and cost effective DC-DC converter that is suitable for a wide range of applications. Its wide input voltage range, high efficiency and comprehensive protection features make it a great choice for many applications. Furthermore, its synchronous rectification buck converter topology and fixed frequency control loop make it an easy to use, efficient and reliable solution.

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