78ST112HC

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DC-DC converters can be used to provide regulated output voltage or current from an unregulated input voltage or current. Popular DC-DC convertor models include the 78ST112HC, a regulated switching power supply which can accept input voltages ranging from 11 to 55 volts. This article delves into the application fields and working principles of the 78ST112HC.

Application Fields

The 78ST112HC is typically used in applications such as:

• High-accuracy systems, specifically those with low noise and low ripple outputs
• Industrial control systems such as the monitoring and protection of high-power drives
• Telecommunication systems
• Automotive electronics
• Power conditioning systems

Some of the key features of the 78ST112HC converter is its low profile and high efficiency. It features a maximum efficiency of 95 percent and ensures the maximum output current is up to 100 Amps.

The 78ST112HC has also been designed with over-temperature protection, over-current protection, and short circuit protection features which makes it suitable for designing night lighting systems, outdoor night decorations, illuminations, motorized screen, and other applications which require a stable power supply output.

Working Principle

The 78ST112HC DC-DC converter uses a buck-type topology to provide a regulated output voltage. The process begins when an AC power source is transformed to a DC voltage (which is then referred to as the input voltage). The input voltage is then rectified and filtered into a DC input voltage (typically 11 to 55 Volts).

The DC input voltage is then applied to a switching circuit which consists of a MOSFET switch, driver, and an inductor. The inductor acts like a charge storing device, and upon the closing of the MOSFET switch, the inductor is charged with the input voltage and stores energy in its magnetic field.

When the switch is opened, due to the inductor\'s property of self-inductance, the stored energy will be inducted into the load side (output side) as a current. This current is smoothed out by the output filter and rectifier, which then produces a regulated output voltage.

The 78ST112HC also contains a feedback circuit which sense the output voltage and compensates for any changes that occurred due to variations in the input voltage or load current. Thus, the 78ST112HC can ensure the output voltage is always stabilized.

Overall, the 78ST112HC DC-DC converter is a low profile, high efficiency converter which has a wide variety of applications ranging from high-accuracy systems to automotive electronics. Its working principle is also simple as the switching control regulates the output voltages through an inductor-based effect.

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