LNK302GN

Product Overview

Category: Integrated Circuit (IC)

Use: Power Management IC

Characteristics: - Low power consumption - High efficiency - Wide input voltage range - Over-temperature protection - Over-voltage protection - Under-voltage lockout - Auto-restart protection

Package: SOT-23

Essence: LNK302GN is a power management IC designed for low power applications. It provides efficient and reliable power conversion with various built-in protections.

Packaging/Quantity: LNK302GN is available in a standard SOT-23 package. It is typically sold in reels of 3000 units.

Specifications

• Input Voltage Range: 85V to 265V AC
• Output Voltage: 5V DC
• Output Current: Up to 100mA
• Efficiency: Up to 80%
• Operating Temperature Range: -40°C to +125°C
• Standby Power Consumption: Less than 50mW

Detailed Pin Configuration

LNK302GN has the following pin configuration:

1. VDD: Power supply input
2. BP/MODE: Feedback and control pin
3. GND: Ground reference
4. Drain: Power switch output

Functional Features

1. Low Power Consumption: LNK302GN is designed to minimize power losses, resulting in reduced energy consumption.
2. High Efficiency: The integrated power switch and control circuitry ensure high conversion efficiency.
3. Wide Input Voltage Range: LNK302GN can operate from a wide range of input voltages, making it suitable for various applications.
4. Over-Temperature Protection: The IC incorporates thermal shutdown protection to prevent damage due to excessive heat.
5. Over-Voltage Protection: LNK302GN safeguards against over-voltage conditions, ensuring the safety of connected devices.
6. Under-Voltage Lockout: The IC includes under-voltage lockout to prevent operation below a specified voltage threshold.
7. Auto-Restart Protection: In the event of a fault or abnormal condition, LNK302GN automatically restarts after a predetermined delay.

Advantages and Disadvantages

Advantages: - Low power consumption - High efficiency - Wide input voltage range - Built-in protection features - Compact SOT-23 package

Disadvantages: - Limited output current capacity (up to 100mA) - Not suitable for high-power applications

Working Principles

LNK302GN utilizes a flyback topology to convert the input AC voltage to a regulated DC output. It employs a primary-side control scheme, where the feedback and control signals are derived from the primary side of the transformer. This approach eliminates the need for an optocoupler, reducing cost and complexity.

The IC operates by controlling the duty cycle of the power switch based on the feedback signal. This ensures that the output voltage remains stable and within the desired range. The integrated protections monitor various parameters, such as temperature and voltage, to ensure safe and reliable operation.

Detailed Application Field Plans

LNK302GN is commonly used in low-power applications that require efficient power conversion. Some typical application fields include:

1. LED Lighting: LNK302GN can be used in LED driver circuits for residential and commercial lighting applications.
2. Home Appliances: It is suitable for powering low-power components in appliances like refrigerators, air conditioners, and televisions.
3. Smart Home Devices: LNK302GN can provide power management for smart home devices such as thermostats, security systems, and voice assistants.
4. Industrial Control Systems: It finds application in industrial control systems that require reliable and efficient power supplies.

Detailed and Complete Alternative Models

1. LNK304GN: Similar to LNK302GN, but with higher output current capacity (up to 200mA).
2. LNK306GN: Offers higher power handling capability and additional protection features.
3. LNK308GN: Designed for higher power applications, providing up to 500mA output current.

These alternative models offer varying specifications and capabilities to suit different power management requirements.

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