U5Y0064

AC DC Converters

The U5Y0064 is a BiMOS III high-efficiency, synchronous switching power supply control integrated circuit. The chip compounds all necessary functions of modern offline power supply control, such as built-in oscillator, main control and protection circuits, and realizes single-chip control for fly-back type AC/DC converters.

With the rapid development of communication, consumer electronic and power supply technology, the requirements for continuous greater power density of electronic products requiring high-efficiency power supply are greater. Therefore, it requires that the AC-DC converter should not only meet the performance requirements for controlling and protection circuit, but also make full use of the advantages of synchronous rectification. In order to achieve the system integration requirements, the integrated circuit should have high integration so that the cost and volume can be reduced, and thus meet the requirements for high efficiency and high power density. Therefore, the development of BiMOS III high-efficiency synchronous switching power supply control integrated circuit U5Y0064 is a milestone of power supply technology development as well as an essential component for high-efficiency and high-power-density equipments.

U5Y0064 Application Field and Working Principle

U5Y0064 is mainly applicable to the below areas:

• TV, monitor power
• Computer adapter power
• Telecommunication product power
• Household appliance power

U5Y0064 features low startup current yet still maintain a high voltage gain margin. It can also achieve low standby power in the high power level. As a cutting-edge IC chip, U5Y0064 is able to boost the power supply efficiency and significantly reduce the cost. In this paper, we will explore the application fields and working principle of U5Y0064.

1. Application Fields

U5Y0064 is a high-efficiency synchronous switching power supply control integrated circuit specially designed for power supply of TVs, monitors, computers, adapters, telecommunication products, and household appliances. It is suitable for various topograhical applicaitons in power industry. The chip is also compatible with high-voltage PFC controllers for various levels of LED lighting application.

2. Working Principle

U5Y0064 is a BiMOS III high-efficiency synchronous switching power supply control integrated circuit. Compared with traditional rectifier only off-line power supplies, U5Y0064 features an innovative synchronous switching power supply control technique. The chip employs a control PWM integrated circuit, and supplements a low voltage oscillator circuit, power control, etc. It is able to achieve zero voltage soft switching, thus reaching a higher power efficiency. Its features include low startup current, high voltage gain margin, low standby power in the high power level, high integration, and so on.

The two important components of U5Y0064 are the power conversion circuit and the control circuit. The power conversion circuit consists of main power transistor, converter primary side components; the control circuit includes a control PWM integrated circuit, and several other control analog and digital components. During normal operation of the power supply, U5Y0064\'s control circuit will generate control signals for the power conversion circuit. The synchronous rectification and skip operation adopted by the power conversion circuit lead to a high power efficiency.