NCP1012APL100R2G

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PMIC - AC DC Converters, Offline Switchers

The NCP1012APL100R2G is part of an ever-growing lineup of power management integrated circuits (PMIC) produced by ON Semiconductor™. This section describes the application field and working principle of the NCP1012APL100R2G, in order to highlight it as an excellent example of an AC to DC converter or offline switcher.

Application Field

The NCP1012APL100R2G is a general-purpose offline switch. It is mainly intended for use in low power designs and is suitable for use in applications with an input voltage of up to 200V AC. Typical applications include powering primary or secondary display backlights, motor drives and other low power applications of up to 20W. Due to its wide input voltage range and its high efficiency, it is an excellent option for applications requiring an AC-DC converter.

Working Principle

The NCP1012APL100R2G operates via a quasi-resonant topology, switching at frequencies between 200kHz and 400kHz. It is capable of regulating both positively and negatively observed power supplies. The circuit comprises a voltage controlled oscillator (VCO) and a power MOSFET connected to a high voltage transformer. The VCO provides the switching cycle for the MOSFET and the transformer converts the AC input voltage to the required DC output voltage.

This PMIC features integrated over-temperature protection, cycle-by-cycle current limiting and a frequency foldback mechanism which reduces the output current when the junction temperature exceeds a certain threshold or when the loading is low. It also comes with an adjustable soft-start and a novel ‘Insulated Drive’ mode which improves the insulation between primary and secondary sides of the circuit.

Conclusion

The NCP1012APL100R2G is a general purpose offline switch which is specifically designed to meet the needs of low power applications of up to 20W. It is capable of regulating both positively and negatively observed power supplies and has integrated over-temperature protection and cycle-by-cycle current limiting. This makes it an excellent choice of AC-DC converter or offline switcher, perfect for use in applications such as primary or secondary display backlights, motor drives and other low power applications.

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