LX1552IDM

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PMIC - AC DC Converters, Offline Switches

The LX1552IDM is an ultra-high efficiency synchronous rectified offline hybrid switching power supply for AC to DC conversion applications. It integrates a high frequency DC/DC power stage with a power factor correction (PFC) stage that achieves superior performance characteristics in components, size, and cost.

The LX1552IDM is especially suitable for mobile consumer electronics, such as battery operated portable devices and digital home appliances, that require a compact and low cost solution. It features a peak efficiency of 95% and maximum power dissipation of 1W while operating at a wide range of input voltage from 100V AC to 265V AC without any external components. This makes the LX1552IDM an ideal candidate for universal line input AC/DC adapters with global acceptance.

Working Principle

The synchronous rectified offline hybrid switching power supply operates based on the following working principle. The input AC voltage is rectified and converted to DC through a PFC stage, then it is transferred to the DC/DC power stage. Here, a high frequency switching step down converter is used to convert the input voltage to the desired output voltage. The high frequency switch consists of a power MOSFET connected in series with an auxiliary winding that is designed to operate with a frequency between 70kHz and 400kHz.

The auxiliary winding is connected to the switching MOSFET such that it turns on and off in each half cycle. As the power MOSFET turns on, it stores energy in the auxiliary winding. During the turn-off period, this stored energy is transferred back to the output capacitance, increasing the efficiency of the rectifier. This high frequency switching stack is also coupled with a driver circuit, which serves to increase the reliability and reduce the system noise.

Finally, a voltage and current doubler rectifier with ultra-low conduction loss rectifies the output of the power stage to yield the required output voltage and current. The entire system is then powered by a wide range of input voltages from 100Vac to 265Vac.

Conclusion

In conclusion, the LX1552IDM is an integrated high efficiency synchronous rectified offline hybrid switch power supply for AC/DC conversion applications. It features a peak efficiency of 95% with a maximum power dissipation of 1W, and supports a wide range of input voltages between 100V AC and 265V AC without needing any external components. This makes it a perfect candidate for universal AC/DC adapters with global acceptance.

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