LPS23 Power Supplies - External/Internal (Off-Board)

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AC DC converters are an essential element in electronic engineering, and have a wide range of applications across a variety of industries. One common AC DC converter is the LPS23, an uncompensated, boost regulated, isolated DC-DC converter. In this article, we will explore the LPS23 application field and its working principle.

Applications of LPS23 AC DC Converters

The LPS23 is a popular AC/DC converter because of its ability to deliver high-efficiency power conversion. As a single-ended primary inductance switcher (SEPIC) or a buck-boost regulator, the LPS23 is ideally suited for both offline and isolated power levels up to 100W. Common applications of the LPS23 include providing power to server and storage systems, industrial automation, and powering medical and communication systems. Furthermore, its robust features also make it a suitable choice for railway and automobile applications that require reliable and robust power supply.

Working Principle of the LPS23

The LPS23 converter operates on a discontinuous conduction mode (DCM) of operation. The circuit includes an input voltage boost inductor that is connected to an input capacitor. The input capacitor and the boost inductor are used to feed the switches, which are typically MOSFETs. The MOSFETs control the inrush current and control the amount of energy stored in the inductor. The switches are driven by the control circuitry and the frequency of the switching is controlled by an internal oscillator.

When a switch is closed, the energy stored in the inductor is transferred to the output capacitor through the transformer. Once the inductor energy has been depleted, the switch is opened and the duty cycle of the oscillator determines how long the switch remains open. During the open phase, energy is transferred from the output capacitor to the load.

The MOSFETs are paralleled in a push-pull configuration, giving the converter the advantage of a high power density and low balance losses. The voltage output is than regulated by the controller, which drives the two MOSFETs to adjust its duty cycle in order to maintain the voltage. The feedback loop in this topology provides a high level of load and line regulation. The input surge current can also be controlled by proper programming of the control current.

Conclusion

The LPS23 offers a range of features that make it a suitable choice for powering servers and medical systems and providing reliable power for railway and automobile applications. Its high efficiency and robust features make it a much sought-after AC/DC converter in many industries. Furthermore, its unique working principle, combining a boost inductor with an oscillator-driven controller to regulate the output voltage, makes it a reliable choice.

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