Greatly optimized offline power supply light load energy efficiency innovative PFC control solution

[Source: "High-tech LED - Technology and Applications" May issue] Today, power supply designers face many challenges, both to achieve higher energy efficiency goals, but also to meet the requirements of accelerating time to market. In terms of achieving higher energy efficiency goals, power supply design must not only consider full load energy efficiency, but also evaluate energy efficiency under conditions of 10%, 20%, 50%, and 75% load. Power supply designers also face many other challenges such as new power supplies that may be more prone to audible noise, increased reliability and security, faster time-to-market, and shorter security certification times.

ON Semiconductor's innovative PFC solution for energy efficiency challenges ON Semiconductor, the world's leading supplier of high performance, energy efficient silicon solutions, continues to develop innovative technologies and products that provide the market with a broad range of power semiconductor solutions, including powerful The PFC product lineup and follow-up products (Figure 1) enable power supply designers to continually develop energy-efficient power solutions. Among them, ON Semiconductor's latest NCP1611 PFC controller uses the innovative Current Controlled Frequency Foldback (CCFF) method to drive the PFC boost stage with a power factor close to 1, and a high drive capability of -500mA/+800mA, Vcc It ranges from 9.5V to 35V and features non-latching and overvoltage protection, voltage sensing, soft start and overcurrent limiting.

Figure 1 ON Semiconductor's PFC product lineup

The NCP1611 Active Power Factor Correction (PFC) controller is ideal for boost pre-converters for ACDC adapters, flat panel TVs and lighting ballasts and other medium power off-line applications. The controller uses a patent pending CCFF architecture. In this mode, when the inductor current exceeds the programmable value, the circuit operates in CrM mode. When the current is below this preset level and the current is zero (null), the NCP1611 can linearly reduce the frequency to approximately 20 kHz. CCFF maximizes rated load and light load efficiency. In particular, standby losses can be minimized. The controller features a range of powerful protection features to handle a wide range of power supply and fault conditions. The NCP1611 extends the benefits of traditional CrM PFC controllers. Figure 2 is a typical application circuit diagram of the NCP1611.

For more information, please refer to the May issue of "High- tech LED- Technology and Applications" magazine.

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