LNK304G

Product Overview

Category

LNK304G belongs to the category of integrated circuits (ICs) used in power management applications.

Use

The LNK304G IC is primarily used for offline switchers in low-power AC/DC power supplies. It provides a cost-effective solution for applications requiring high efficiency and low standby power consumption.

Characteristics

• High efficiency: The LNK304G offers excellent efficiency across a wide load range, resulting in reduced power dissipation.
• Low standby power: This IC features an ultra-low standby power consumption, making it suitable for energy-efficient designs.
• Compact package: The LNK304G is available in a compact SMD package, allowing for space-saving designs.
• Enhanced safety features: It incorporates various protection features such as over-temperature shutdown, output short-circuit protection, and open-loop protection.

Package and Quantity

The LNK304G is typically packaged in a small outline SMD package, such as SO-8 or DIP-8. It is commonly available in reels or tubes, with quantities varying depending on the supplier.

Specifications

• Input voltage range: 85 VAC to 265 VAC
• Output power: Up to 10 W
• Frequency range: 50 Hz to 60 Hz
• Standby power consumption: Less than 100 mW
• Operating temperature range: -40°C to +150°C

Pin Configuration

The LNK304G IC has a standard pin configuration as follows:

_______ | | NC |1 8| VCC FB |2 7| GND DRAIN |3 6| SOURCE NC |4 5| CONTROL |_______|

Functional Features

• Primary-side control: The LNK304G utilizes primary-side regulation, eliminating the need for an optocoupler and secondary-side feedback circuitry.
• Constant voltage output: It provides a stable and regulated output voltage, ensuring reliable operation of connected devices.
• Frequency jittering: The IC incorporates frequency jittering to reduce electromagnetic interference (EMI) emissions, complying with international standards.
• Auto-restart protection: In case of a fault condition, the LNK304G features auto-restart protection, enhancing system reliability.

Advantages and Disadvantages

Advantages

• High efficiency and low standby power consumption contribute to energy savings.
• Compact package allows for space-efficient designs.
• Integrated safety features enhance system reliability.
• Primary-side control simplifies circuit design and reduces component count.

Disadvantages

• Limited output power capability compared to higher-power ICs.
• May require additional external components for specific applications.

Working Principles

The LNK304G operates on the principle of primary-side regulation. It uses a flyback topology to convert the AC input voltage into a regulated DC output voltage. The IC controls the switching of the power MOSFET based on the feedback received from the primary winding of the transformer. This eliminates the need for an optocoupler and secondary-side feedback circuitry, reducing cost and complexity.

Detailed Application Field Plans

The LNK304G is widely used in various low-power AC/DC power supply applications, including but not limited to: - LED lighting - Home appliances - Consumer electronics - Industrial equipment - Smart meters

Alternative Models

For applications requiring different specifications or features, alternative models to consider include: - LNK302G: Similar functionality with lower power rating. - LNK305G: Higher power rating with additional features. - LNK306G: Enhanced protection features for demanding applications.

These alternative models provide flexibility in choosing the most suitable IC for specific design requirements.

In conclusion, the LNK304G is a versatile IC used in low-power AC/DC power supplies. Its high efficiency, low standby power consumption, and integrated safety features make it an ideal choice for energy-efficient designs. With its primary-side control and compact package, the LNK304G simplifies circuit design while saving space. However, designers should consider alternative models based on specific application requirements.