SI9120DY-E3

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PMIC - AC DC Converters, Offline Switchers

SI9120DY-E3 is an integrated offline switcher for consumer, industrial and automotive applications, integrated with a MOSFET and current-mode PWM controller.The SI9120DY-E3 is designed to provide a cost-efficient solution for SMPS in consumer applications such as adapter, or any other power supplies requiring a universal input, integrated PFC and PSM PWM. It offers best-in-class power density, efficiency and EMI performance, making it suitable for residential, IT and consumer applications.Application Field:The SI9120DY-E3 is a highly integrated offline switcher for use in consumer, industrial, and automotive applications. It is capable of providing an efficient power supply solution with an integration of a MOSFET, current-mode PWM controller, built-in EMI filter, super-low start-up current, power dissipation detector and adjustable over-voltage protection.The SI9120DY-E3 is suitable for applications such as:

• Chargers for mobile phones, digital cameras and netbook computers
• Adapter and power supplies requiring universal input
• Power supplies in IT and residential applications
• Automotive applications

Working Principle:The SI9120DY-E3 is a high-performance current-mode controller for AC/DC converters using primary-side regulation. It consists of an avalanche-rugged MOSFET with integrated current-sense, a PWM controller and various power management features, providing an efficient and low-cost solution for universal input applications such as adapters and power supplies requiring a universal input. The PWM controller senses the peak current flowing through the primary side MOSFET by means of the integrated current-sense, providing an optimal regulation for SMPS. This feature simplifies the design, eliminating opto-couplers and secondary-side controllers, which are needed in 48V-net SMPS applications.High-voltage startup is also enabled by the integrated super-low start-up current, reducing the external component count, cost and board space. Moreover, the internal compensation and adaptive dead-time control compensates the affects of changing line and load conditions. The SI9120DY-E3 also has an integrated EMI filter and adjustable over-voltage protection, adding reliability to the system.In conclusion, the SI9120DY-E3 is an ideal choice for offline applications requiring high-efficiency, low EMI and, high-speed response. It is capable of providing an efficient power supply solution with an integration of a MOSFET, current-mode PWM controller, built-in EMI filter, super-low start-up current, power dissipation detector and adjustable over-voltage protection.

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