NCP1217AP133G

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PMIC (Power Management ICs) plays an indispensable role in today\'s industry. It can provide electricity to multiple digital circuits and peripherals such as processor, memory, display, and communication interface, thus guaranteeing an optimal power supply and a stable and efficient system operation. In this article, we will focus on a specific PMIC, the NCP1217AP133G, and explore its application fields and working principle.

Introduction to NCP1217AP133G

The NCP1217AP133G is an advanced AC/DC converter and switching regulator integrated solution from ON Semiconductor. It is compliant with the latest IEC 62368-1 safety standard, which requires additional safety measures for electronic equipment for audio-video and information technology applications.

The NCP1217AP133G has a built-in synchronous rectification topology to support high power conversion efficiency (up to 94%). It includes a dual MOSFET power switch and requires few external components. It also features over-voltage, over-current, over-temperature protection and a power-good signal.

The NCP1217AP133G is ideal for use in off-line applications such as AC/DC adapter and LED driver applications. It is available in a 16-lead thin SOIC package rated for operation from -55°C to +125°C.

Application fields

The NCP1217AP133G offers increased design flexibility and time saving features, making it suitable for a wide range of applications. Here are some of the key applications:

• AC/DC adapters
• LED drivers
• Battery chargers
• Set top box power supplies
• Video game consoles
• Computer peripherals
• LCD Displays

Working Principle

The NCP1217AP133G integrates a synchronous rectification topology to provide high power conversion efficiency (up to 94%). The integrated design requires few external components; only two series-connected MOSFETs, an input capacitor, an output capacitor, a transformer, and an AUX winding are needed to implement a flyback converter.

When an AC input voltage is applied, the current begins to flow through the inductor and the forward-biased input diode. The voltage on the auxiliary winding is sensed and compared with a voltage reference to generate a sawtooth waveform. This waveform is used to turn on and off the power MOSFET switch according to the auxiliary voltage sense.

When the input current is generated, the energy stored in the inductor will go through the output capacitor, flyback transformer and the freewheeling diode to output the DC voltage. When the input voltage is removed, the output capacitor will provide enough energy to keep the output voltage stable until the next AC input cycle.

Conclusion

The NCP1217AP133G is an advanced AC/DC and offline switcher designed for effective and reliable power conversion in off-line applications. With its flexible design and superior performance, it is suitable for use in a wide range of applications such as AC/DC adapters and LED drivers. Furthermore, its built-in synchronous rectification topology ensures a high power conversion efficiency, making it an ideal choice for energy-saving applications.

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