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PMIC - AC DC Converters, Offline Switchers

The TNY279PN is a ChipGY is a highly integrated Off-line Switcher IC specially designed to offer embedded designers improved safety, lower Standby Power and best In-Class efficiencies in comprehensive large-scale applications. This IC offers low standby power and higher standby power efficiency. It works in ultra-low EMI applications. It is also suitable for LCP or FRP circuit boards. This IC helps to reduce system cost by incorporating its cost-effective, high integration feature.

Application Field

The TNY279PN is an ideal for various type of AC/DC converter applications, such as flyback converters and power factor correction (PFC) with standby power from 1W to 80W. This IC is also suitable for EMI-sensitive applications, such as Home Automation, Lighting, Set-Top-Box, IP Cameras and Tablet for adapters, DC-DC Converters and White Goods. The TNY279PN is suitable for various application fields, such as Consumer and Office Equipment, Computing and Networking, Telecomms System and Industrial.

Working Principle

The working principle of the TNY279PN is extremely simple. It utilizes a single power MOSFET switch, a voltage mode controller and a few external components to implement a fixed off-time and a PWM control scheme that can be used to achieve a fast and accurate output regulation. The device is a highly integrated low-cost Off-Line Switcher that combines a PWM controller, a current sense amplifier, an internal deep depletion N-Channel MOSFET and three driver transistors into a single package. The PWM controller (or the “primary”) regulates the voltage applied to the primary winding of the transformer whilst the “secondary” driver (or secondary side FET driver) regulates the voltage applied to the secondary winding. The PWM controller is programmable to regulate the output in a fixed off-time and PWM (pulse width modulation) control mode. It is also configurable to start up in either single pulse voltage or continuous conduction mode to reduce the inrush current during turn-on.

The current sense amplifier is responsible for sensing the output current and regulating the primary control signal in order to keep the output current and power at the set levels. The internal deep depletion N-Channel MOSFET is responsive to the signal from the PWM controller, and is used to switch the output current from the primary winding. The three driver transistors are responsible for driving the output secondary side FET and controlling the output current. The output FET is responsible for forcing the output voltage across the load to reach the regulation setpoints. The output protection circuitry provides safety shutdown to prevent overvoltage, over-current, under-voltage and over-temperature conditions.

To summarize, the TNY279PN is a highly integrated, cost-effective Off-Line Switcher IC, that helps meet the demands of embedded design while offering improved safety, improved standby power and best-in-class efficiencies. It is suitable for various applications fields and offers superior performance in EMI sensitive applications.

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