LNK419EG

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 - Short-circuit protection

Package: DIP-7 (Dual In-line Package 7 pins)

Essence: The LNK419EG is a power management IC designed for low power applications. It provides efficient power conversion and protection features in a compact package.

Packaging/Quantity: The LNK419EG is typically sold in reels containing 2500 units per reel.

Specifications

• Input Voltage Range: 85V AC to 265V AC
• Output Voltage: 5V DC
• Output Current: Up to 100mA
• Efficiency: Up to 80%
• Operating Temperature Range: -40°C to +150°C

Detailed Pin Configuration

The LNK419EG has the following pin configuration:

1. VDD: Power supply input
2. GND: Ground reference
3. BP/MODE: Feedback pin for setting the output voltage
4. FB: Feedback pin for voltage regulation
5. DRAIN: High-voltage power MOSFET drain connection
6. SOURCE: High-voltage power MOSFET source connection
7. VCC: Supply voltage for internal control circuitry

Functional Features

• Primary-side sensing eliminates the need for an optocoupler or third winding
• Auto-restart protection feature for fault conditions
• Frequency jittering reduces EMI filter cost
• Built-in current limit and hysteretic thermal shutdown for enhanced safety

Advantages and Disadvantages

Advantages: - Compact size - High efficiency - Wide input voltage range - Integrated protection features - Cost-effective solution for low power applications

Disadvantages: - Limited output current capacity - Not suitable for high-power applications

Working Principles

The LNK419EG is based on the LinkSwitch-TN2 topology, which integrates a high-voltage power MOSFET, control circuitry, and protection features into a single chip. It operates by converting the high AC input voltage to a regulated DC output voltage using a flyback converter topology.

The primary-side sensing technique eliminates the need for an optocoupler or third winding, reducing component count and cost. The IC incorporates various protection features such as over-temperature, over-voltage, and short-circuit protection to ensure safe operation.

Detailed Application Field Plans

The LNK419EG is commonly used in low power applications that require efficient power management. Some typical application fields include:

1. Home automation systems
2. LED lighting
3. Consumer electronics
4. Industrial controls
5. Smart meters

Detailed and Complete Alternative Models

1. LNK419PG: Similar specifications and features, but with a different package (SMD-8)
2. LNK419DG: Higher output current capacity (up to 200mA), suitable for slightly higher power applications
3. LNK419FG: Lower input voltage range (60V AC to 265V AC), suitable for specific regions with lower mains voltage

These alternative models provide flexibility in choosing the most suitable option based on specific requirements and constraints.

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