A few days ago, ON Semiconductor announced the launch of a series of AC-DC controllers and drivers for USB-PD, which can significantly reduce the bill of material (BOM) content of energy-efficient AC-DC power supplies, especially in the load range above 100 W.

EEWORLD interviewed Li Zhiyuan, product marketing manager of ON Semiconductor‘s Advanced Solutions Department. During the dialogue, Li Zhiyuan took ON Semiconductor‘s products as an example to explain the technical development trend and requirements of AC-DC chargers in detail. Below are the details of the conversation.

1. How does ON Semiconductor view the development of chargers? How important is this seemingly inconspicuous market for global decarbonization?

Li Zhiyuan: With the development of smartphones, the output power of chargers is getting bigger and bigger, from 5 W -10 W chargers more than ten years ago, to today‘s super fast charging / fast charging / USB PD charger output power to more than 100 W. Almost everyone in China has more than one mobile phone, so the energy efficiency of the charger also has a considerable impact on carbon emission reduction. ON Semiconductor‘s charger solutions have been committed to promoting energy-efficient miniaturization designs. For example: Our 100 W charger solution uses a new generation of 6-pin power factor correction (PFC) controller - NCP1623, with boost follower function, under 115 VAC input voltage, the energy efficiency is increased by about other traditional PFC solutions 2%, greatly reducing the power consumption of the charger.

2. Can you briefly introduce the history and milestones of ON Semiconductor in the charger market?

Li Zhiyuan: In recent years, high-power USB PD travel adapters and super fast-charging mobile phone chargers have developed very rapidly. It has rapidly developed from the past 18W QC 2.0 to today‘s 65W or even more than 100W USB PD Type C and super fast charging. ON Semiconductor has been committed to the continuous development of high-efficiency and high-power-density power solutions, and has also seen this market opportunity. As early as many years ago, it has developed the industry‘s first quasi-resonant flyback controller NCP1340 with a switching frequency of 300 k or above. , and then continued to develop the NCP1342 that can improve light-load energy efficiency. At the beginning of this year, it launched a new generation of NCP1345 designed for USB PD adapters and simplified peripheral components. Many well-known mobile phone manufacturers at home and abroad have 65 W, 80 W and 100 W. Super fast charging chargers above W, and multi-port USB PD travel adapters of well-known brands all use our NCP134x series.

3. The focus of ON Semiconductor‘s business is industry and automobiles. How is ON Semiconductor‘s support for the consumer power supply market?

Li Zhiyuan: In the consumer power supply market, such as the high-efficiency and high-density USB PD travel adapters and super fast-charging mobile phone chargers I mentioned above, ON Semiconductor continues to develop PFC controllers for this market, quasi-resonant flyback, and Source clamp flyback and synchronous rectification controller, and also established a series of evaluation boards designed according to actual market applications for customers‘ reference, such as 65W Type-C PD3.0/PPS charger solution evaluation board, 100 W Type-C PD3. 0/PPS charger solution evaluation board, etc.

4. Compared with industrial, automotive and cloud infrastructure, what are the differences in AC/DC demand and technology development in the charger market? What are the selling points of ON Semiconductor products in the charger market?

Li Zhiyuan: Compared with the power supply of other applications, mobile phone chargers and USB PD adapters need to be smaller and more portable. A USB PD adapter with a super fast charging charger of 65 W or even more than 100 W, it is best to follow the previous 5 W/10 The size of W is the same, or even less, so the challenge is how to greatly improve the power density. Power devices such as MOSFETs and transformers, capacitors, and other devices need to be smaller, but at the same time loss and temperature rise are also reduced. In addition, it must also meet the no-load standby power consumption, light-load energy efficiency and average energy efficiency requirements of Energy Compliance such as CoC V5 tier2 DoE. In the application of chargers or USB PD adapters, it is not a single output operating point, but from 3.3 V to 20 The entire output range of V. Therefore, the technical requirements of developers are very high inside a small charger. And ON Semiconductor‘s AC-DC controller products and solutions are continuously developed and developed for the route of high energy efficiency and high power density. The NCP134x quasi-resonant flyback controller mentioned earlier, the switching frequency can reach more than 300 khz, making the The transformer and capacitor of the switching power supply are reduced, and at the same time, different PD outputs can meet the no-load standby power consumption, light-load energy efficiency and average energy efficiency requirements of Coc V5 Tier 2 and DoE. ON Semiconductor‘s LLC controller solution NCP1399x, with a switching frequency of 300 Khz, is suitable for high power density gaming notebooks above 150 W and USB PD multi-port travel adapter designs. The just-launched Totem Pole PFC controller NCP1680 helps developers solve the power consumption and heat dissipation problems of the rectifier bridge on high-density chargers or travel adapters above 150 W, and greatly improves the energy efficiency of AC-DC power supplies. Make the program smaller.

5. What does ON Semiconductor think will be the development trend of the charger market in the future?

Li Zhiyuan: With the newly released USD PD 3.1 (EPR), the USD PD output can be increased to 48 V/5 A, and the power can be increased to 240 W. This means that the USD PD AC-DC adapter has a wider range of applications. Not only super fast charging of mobile phones, gaming notebooks, but even smart displays to power tools. Different types of portable devices have the opportunity to use USB PD 3.1 adapters. Due to the higher allowable power, wider output voltage and higher power rate density of USB PD 3.1, the design also faces greater challenges. For this application, ON Semiconductor‘s application engineer team is conducting related reference designs, which will be released in the near future. release.

The above is the interpretation of "how AC-DC technology meets the development trend of USB-PD". Find ON Semiconductor products on ShenZhen Hao Qi Core Technology, spot supply, professional engineers, small batch procurement network, industrial procurement platform, service electronic components, spot mall, welcome to consult at any time!