NCP12700ADNR2G

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PMIC - AC DC Converters, Offline Switchers – NCP12700ADNR2G Application Field and Working Principle

PMIC - AC DC converters, offline switchers are important components of power management systems. The NCP12700ADNR2G is a state-of-the-art low-consumption off-line switch-mode controller manufactured by ON Semiconductor. It is designed to drive high-current loads from low-cost universal mains sources. This article focuses on the application field and working principle of the NCP12700ADNR2G.

The NCP12700ADNR2G has all the features of a traditional off-line power supply in a very small package. It is suitable for AD Converters, DC converters, LED drivers, lasers and many other applications. The device operates from a DC input voltage of 100 V to 500 V and can withstand an input voltage transient up to 500 V. It has the capability to regulate the output voltage with an accuracy of ±2 % across the whole input voltage range.

The NCP12700ADNR2G has an advanced high-voltage startup system and is able to start without an auxiliary winding. It can be used to build single-ended primary-inductor converter or flyback topology power supplies. In order to ensure compliance with EMC and safety standards, the device provides output voltage protection, even during heavy load steps. Furthermore, it has adjustable soft start, fault protection and an open loop function.

The NCP12700ADNR2G operates according to the Constant Off-Time frequency modulation. The current loop improvements enable an improved loadand line regulation, particularly under low load conditions. With the aim of reducing acoustic noise, the frequency can be adjusted from 20kHz to 150kHz. The switching frequency is automatically reduced in presence of an over-temperature condition.

As far as protection is concerned, the device can limit both the peak current and the maximum dissipation during line transients and short circuits. Several protection and status signals are also available to ensure a robust and secure power system. The thermal protection circuitry includes a shutdown function that is triggered when the power dissipated by the device exceeds a pre-programmed threshold.

The NCP12700ADNR2G is capable of providing up to 1.2 A of output current with a line regulation of 12 mV and a load regulation of 0.1%. Its excellent efficiency allows operation at very low temperatures, which is essential for applications operating in extreme environments. Its areas of application range from industrial to automotive and the device is able to withstand a temperature range of –55°C to +160°C.

In summary, the NCP12700ADNR2G is a high-performance, solution cost-effective switch-mode controller capable of delivering low-consumption off-line supplies. It has excellent features, such as constant off-time frequency modulation, adjustable frequency, thermal shutdown, and adjustable soft start, that guarantee a very robust and secure power system. It is suitable for a wide range of applications, ranging from industrial to automotive.}

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