SG312

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Inrush current limiters (ICLs) are essential components used to protect power supplies from potential damage due to over-current and voltage spikes. The protection is achieved by limiting the amount of current that can flow through the supply when it is first turned on or under other circumstances when high inrush currents can suddenly occur. To accomplish this, ICLs employ a variety of methods involving the strategic use of resistors, capacitors, and other components. One example of an ICL is the SG312, which uses a combination of series and parallel resistors to limit the inrush current. This paper will discuss the application field and working principle of the SG312.

The SG312 is best suited for applications where low voltage drop is necessary, such as in power supplies with lower power outputs. It is typically used for inrush current limiting in AC-to-DC transformerless power supplies, AC adapters, and other related equipment. It is designed to provide low voltage drop without the need for external components such as bypass capacitors or other current limiting circuits. This makes it an ideal choice for applications requiring minimal power losses or input voltages as low as 1.8 V.

The SG312’s working principle is based upon a combination of series and parallel resistors. The resistors are arranged in such a way that when the device is turned on and the inrush current begins to flow, a voltage drop is created across the resistors reducing the current to a safe level. This voltage drop is proportional to the resistance value of the resistors, so it is possible to optimize the current limiting by adjusting the ratio of series to parallel resistors.

Aside from limiting the inrush current, the SG312 also provides some degree of protection against other circuit hazards, such as inductive voltage spikes and surge currents resulting from rapid changes in input voltage. This is accomplished by the device’s unique combination of series and parallel resistors, which help to absorb and dissipate any such surges. Additionally, the SG312 has the added benefit of being able to provide a low voltage drop with minimal power losses, making it an attractive option for power supplies with lower power outputs.

In conclusion, the SG312 inrush current limiter can be an invaluable tool for protecting power supplies from over-current and voltage spikes. The device utilizes a combination of series and parallel resistors to limit the inrush current, while also providing some degree of protection against other circuit hazards. Additionally, the SG312 provides a low voltage drop and minimal power losses, making it an ideal choice for applications with lower power outputs.

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