TNY278GN

Duty Cycle:	65%
Mounting Type:	Surface Mount
Supplier Device Package:	SMD-8C
Package / Case:	8-SMD (7 Leads), Gull Wing
Operating Temperature:	-40°C ~ 150°C (TJ)
Control Features:	EN
Fault Protection:	Current Limiting, Open Loop, Over Temperature, Over Voltage, Short Circuit
Power (Watts):	28W
Frequency - Switching:	132kHz
Series:	TinySwitch®-III
Voltage - Supply (Vcc/Vdd):	--
Topology:	Flyback
Voltage - Breakdown:	700V
Internal Switch(s):	Yes
Output Isolation:	Isolated
Part Status:	Active
Packaging:	Tube

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Introduction

The TNY278GN is a series of offline switchers made by Power Integrations Inc. (PI). It is designed as a low power solution for demanding energy efficiency applications such as consumer electronics, telecommunications, automotive, and industrial. The TNY278GN can easily meet stringent energy regulations by providing high efficiency and high power density to the customer. In addition, the TNY278GN has a wide input voltage range, low voltage operation, low power operation, and protection against over-temperature, overload, and short-circuit protection.

Application Field

TNY278GN is mainly used in consumer electronics, telecommunications and automotive fields. In consumer electronics, the TNY278GN can be used in devices such as TV, monitor, laptop, tablet and mobile phone chargers. In telecommunications, it can be used in power supplies for switches, routers and base stations. Finally, in automotive, the TNY278GN is often used in infotainment systems, electronic control units and power trains.

Working Principle

The TNY278GN works on a flyback topology, which is a popular transformer-based topology to provide power conversion from a DC input to an AC output. The TNY278GN has one main switch and a number of secondary switches that work together to transfer energy. The main switch is an N-channel MOSFET that is used to regulate the primary side current, while the secondary switches are used to regulate the secondary side current. The TNY278GN has two main operating modes: normal operating mode and sleep mode. During normal operation, the main switch is switched on and off repetitively at a frequency, depending on the load, to create an alternating voltage on the primary side. On the primary side, the voltage build up to a setpoint at which the controller activates the secondary switches. This is done by comparing the active primary side voltage with the reference voltage provided by the internal reference voltage source. Once the secondary switches are activated, a portion of the energy stored in the transformer is transferred to the secondary side. The energy is rectified, regulated and filtered to produce the output. In sleep mode, the TNY278GN switches off the main switch and the primary side voltage drops to a low level, reducing energy consumption.

Conclusion

The TNY278GN is an efficient, low-power, high-performance solution for demanding energy efficiency applications. It works on a flyback topology with a main switch and various secondary switches working in unison to control the output. The TNY278GN has a range of features such as a wide input voltage range, low voltage operation, low power operation and over-temperature and overload protection. It is suitable for use in consumer electronics, telecommunications, automotive and industrial applications and is designed to meet stringent energy regulations by providing high efficiency and high power density.

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