LNK354PN

Series:	LinkSwitch®-HF
Packaging:	Tube
Part Status:	Not For New Designs
Output Isolation:	Isolated
Internal Switch(s):	Yes
Voltage - Breakdown:	700V
Topology:	Flyback
Voltage - Supply (Vcc/Vdd):	--
Duty Cycle:	63%
Frequency - Switching:	200kHz
Power (Watts):	5W
Fault Protection:	Current Limiting, Open Loop, Over Temperature, Short Circuit
Control Features:	--
Operating Temperature:	-40°C ~ 150°C (TJ)
Package / Case:	8-DIP (0.300", 7.62mm), 7 Leads
Supplier Device Package:	DIP-8B
Mounting Type:	Through Hole

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LNK354PN Application Field and Working Principle

LNK354PN, a product produced by Power Integrations, Inc., is a flyback switcher IC used in a variety of AC/DC converter applications. It operates in a discontinuous conduction mode (DCM), allowing the switcher to handle high-voltage transient applications such as overvoltages, ring drops, cable surges, and light load drops. This design reduces power dissipation, enabling higher efficiency and lower cost in flyback power converters. The open-loop operation also allows LNK354PN to be used as an offline switcher.

Application Field

The most common application for the LNK354PN is for offline AC/DC power supplies in either an isolated or non-isolated configuration. It is used in a variety of applications, from laptop power supplies and cell phone chargers to small appliances, boost converters, and motor drives. The LNK354PN can also be used as a buck regulator, with the addition of an external bridge rectifier.

Working Principle

The LNK354PN is a flyback converter with a synchronous rectifier configuration. In this system, the primary side of the converter is connected to an AC supply voltage, while the secondary side is connected to a DC load. When the AC voltage is applied, a high frequency oscillator starts, causing the power switch (MOSFET) to turn on. This causes current to flow through the primary side, inducing a voltage in the transformer secondary winding.When the voltage on the secondary winding is high enough, it is rectified and fed to the load. During this time, the MOSFET is turned off, thus allowing only magnetizing current flow through the transformer. This continues in a cyclic fashion, thus producing a DC output to the load. The power switch remains on for a given time period depending upon the current requirements of the load. When the peak current limit is reached, the switch turns off and the transformer core is energized again. This behavior is distinctive of a flyback converter and allows the system to operate in discontinuous conduction mode for better power efficiency.When using the LNK354PN for offline switcher applications, the same principle still applies. An AC voltage source is connected to the primary side, while the secondary side is connected to a DC load. When the voltage is applied, the MOSFET turns on, allowing current to flow in the primary side. This creates a voltage in the transformer secondary side, which is then rectified and fed to the load. When the peak current limit is reached, the power switch turns off.

Conclusion

The LNK354PN is a flyback switcher IC used in a variety of offline AC/DC converter applications. It operates in a discontinuous conduction mode (DCM), allowing the switcher to handle high-voltage transient applications such as overvoltages, ring drops, cable surges, and light load drops. The LNK354PN is used in a variety of applications, from laptop power supplies and cell phone chargers to small appliances, boost converters, and motor drives. It can also be used for buck regulator applications with the addition of an external bridge rectifier. The principle of operation of the LNK354PN involves a high-frequency oscillator causing the power switch (MOSFET) to turn on, causing current to flow through the primary side and inducing a voltage in the transformer secondary winding. When the peak current limit is reached, the switch turns off, allowing the transformer core to be energized again.

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