LNK354G

Duty Cycle:	63%
Mounting Type:	Surface Mount
Supplier Device Package:	SMD-8B
Package / Case:	8-SMD (7 Leads), Gull Wing
Operating Temperature:	-40°C ~ 150°C (TJ)
Control Features:	--
Fault Protection:	Current Limiting, Open Loop, Over Temperature, Short Circuit
Power (Watts):	5W
Frequency - Switching:	200kHz
Series:	LinkSwitch®-HF
Voltage - Supply (Vcc/Vdd):	--
Topology:	Flyback
Voltage - Breakdown:	700V
Internal Switch(s):	Yes
Output Isolation:	Isolated
Part Status:	Obsolete
Packaging:	Tube

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LNK354G Application Field and Working PrincipleThe LNK354G is a highly integrated AC/DC converter and offline switcher series specifically designed for isolated, low-power applications. The package includes two switches, one for current control, and one for voltage protection. It provides complete power conversion all inside a tiny footprint, reducing system form factor and cost.The LNK354G is designed for applications such as LED backlighting, ac/dc adapter, point-of-load regulation, and other low power, isolated converters. It provides a single, integrated system solution that reduces cost, volume, and time to market.The LNK354G features a wide input voltage range (85VAC-265VAC), and high efficiency through primary and secondary side regulation. Its primary regulation feature can easily achieve higher efficiency (up to 87%) at light loads and it provides fast transient response and faster accuracy at wide input voltage ranges. The LNK354G also includes a power supply supervisor for easy protection.The LNK354G also offers better output isolation, thermal performance and higher efficiency at mid-to-high power levels as compared to previous generation products. Furthermore, it eliminates the need for an external RC network, resulting in fewer external components and reducing system cost.The LNK354G\'s working principle is based on an isolated topology. The primary side regulator is the main element for power management and the secondary side design is for optimized efficiency and low-cost implementation. The internal transformer provides galvanic isolation between input and output, allowing the power supply to operate safely in any environment.The power flow of the LNK354G follows this key sequence. On the primary side, the power flow first passes through a full-bridge rectifier and then to the primary-side regulators, which offer fast power delivery, high efficiency and high ripple rejection. On the secondary side, the power flow passes through an isolated transformer that separates the input voltage from the output voltage. The secondary-side regulators provide regulated output voltage to the system load, as well as protection and reset by the power supply supervisor.In conclusion, the LNK354G is an excellent all-in-one solution for isolated AC/DC converters and offline switchers with high efficiency, fast transient response and low total system cost. Its performance, efficiency, small size and cost make it a great choice for applications in LED backlighting, ac/dc adapter, point-of-load regulation, and other low power, isolated converters.

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