KRS25F-03

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The KRS25F-03 AC / DC converter, which is classified as AC DC Converters, is a member of the family of off-line AC / DC step-down converter topologies with isolated output working in the boundary conduction mode (BCM). It integrates a full-wave single-stage PFC pre-regulator followed by an LLC converter operating at a constant frequency. It can accept an input voltage from 85 Vac to 264 Vac and provides a stabilized, isolated DC output voltage adjustable from 1V to 12V with tight regulation and high efficiency.

The KRS25F-03 AC / DC Converter is a single-stage power factor corrector composed of a boost power factor correction transistor (PFC) inductor-capacitor (L-C) power converter, followed by a low-side and a high-side switch for an isolated output. The circuit works in the boundary conduction mode to provide high efficiency. The PFC pre-regulator draws a sinusoidal current from the input voltage source to provide high power factor and reduces current stress on the components. The LLC converter operates in the continuous conduction mode (CCM).

The output voltage of the KRS25F-03 AC / DC converter is regulated by means of active valley switching to achieve ideal power conversion efficiency. The LLC resonant tank includes a series inductor, a shunt capacitor and two switches. The magnetizing current in the series inductor and the capacitive current in the shunt capacitor are alternately exchanged to achieve converter turn-on and turn-off with a low switching loss than the other topologies. It is made possible by the quasi-resonance or zero-voltage switching (ZVS) operation.

The output voltage and current of the KRS25F-03 AC / DC converter is sensed by means of resistors in order to provide a feedback signal to the controller. The stabilized output voltage is adjusted by a single resistor located on the board. The surge current protection includes both the input by-pass diode and 6.5A fuse. The KRS25F-03 AC / DC converter also includes over-voltage protection, short-circuit protection, over-temperature protection and standby mode.

The KRS25F-03 AC / DC converter is a perfect solution for industrial electronics, LED lighting, home appliances and telecom applications. The efficiency of the KRS25F-03 AC / DC converter is typically in the range of 87-90%; it has a very low leakage current and can support a maximum output power of 25W. The converter is also EMI compliant, making it suitable for meeting all necessary standards.

The KRS25F-03 AC / DC converter is a complete, low-cost solution that offers high efficiency, low cost and easy usage for AC / DC power supply applications. It has several attractive features that make it ideal for a wide range of applications. The KRS25F-03 AC / DC converter has been designed to meet stringent efficiency and output voltage regulation requirements, and is a high reliability product with excellent performance.

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