LNK364PG

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The LNK364PG is a series of high performance off-line switcher with minimal external components, specifically designed for switch mode power supply applications with up to 80 watts of output power. It is the first integrated offline switcher designed with a bi-level topology, which allows for different levels of light load and normal operation for efficient operation and power saving, allowing for higher efficiency and lower operational noise.

The main features of the LNK364PG are:

• Automatically optimizes critical parameters for top efficiency.
• Bi-level design allows full switching frequency operation at light loads.
• Programmable soft-start mutes turn-on transients.
• Overvoltage Protection (OVP) prevents excessive voltage.
• Undervoltage Protection (UVP) protects the IC from damage.
• Thermal Protection (OTP) protects the IC from damage.
• Over Temperature Protection (TP) prevents overheating.

The LNK364PG can be used for a variety of power supply applications, including replacement for linear power supplies, switched mode battery chargers, isolated AC/DC converters, DC/DC converters, and other off-line power supplies.

The main advantage of the LNK364PG is its superior operating efficiency, which enables the device to achieve a high efficiency rating at all load levels. Other advantages include its low noise operation, minimal external components requirements, optimized dynamic response, and universal input power supply capability.

The working principle behind the LNK364PG is simple but effective. The device operates as a switch mode power supply, using a synchronous rectifying approach. The device includes an input rectifier, controller, synchronous rectifying transistor, and an output rectifying capacitor. When the input power supply is connected, the controller senses the voltage and current at the input and turns on the synchronous rectifying transistor. This in turn turns the input voltage into a constant voltage and current at the output, while controlling the operating frequency to maintain the operating efficiency.

The LNK364PG is designed to operate over a broad input voltage range, from 70 to 250V AC or DC. Additionally, it can also operate with lower than nominal input voltages with controlled deformations of the waveform, allowing proper operation and protection as if the nominal input voltage were applied. In order to optimize efficiency, the LNK364PG features a bi-level design that allows for differing levels of light load and normal operating condition efficiency, allowing effective operation and power saving.

The LNK364PG is an ideal solution for a wide range of AC/DC converter and off-line switcher applications. It offers superior operating efficiency, minimal external components requirements, and an easily programmable soft-start feature to make life easier for keeping noise levels under control. Additionally, it provides excellent protection features such as overvoltage protection, undervoltage protection, over temperature protection, and thermal protection, all in a single integrated package.

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