LNK304DN

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 - Over-current protection

Package: DIP-8 (Dual In-line Package)

Essence: The LNK304DN is a power management IC designed for low-power applications. It provides efficient and reliable power conversion, making it suitable for various electronic devices.

Packaging/Quantity: The LNK304DN is typically sold in reels or tubes containing 1000 units per package.

Specifications

The LNK304DN has the following specifications:

• Input Voltage Range: 85V to 265V AC
• Output Voltage Range: 5V to 25V DC
• Maximum Output Power: 3W
• Operating Temperature Range: -40°C to +150°C
• Efficiency: Up to 85%
• Frequency Range: 66kHz to 132kHz

Pin Configuration

The LNK304DN has a standard DIP-8 pin configuration as follows:

1. VCC - Power supply voltage input
2. FB - Feedback pin for regulating output voltage
3. GND - Ground reference
4. Drain - High-voltage power MOSFET drain connection
5. Sense - Current sense input
6. NC - No connection
7. Source - High-voltage power MOSFET source connection
8. VOUT - Regulated output voltage

Functional Features

The LNK304DN offers the following functional features:

• Primary-side control eliminates the need for an optocoupler and secondary-side feedback circuitry.
• Auto-restart protection feature ensures continuous operation even in the event of a fault condition.
• Accurate output voltage regulation with minimal external components.
• Built-in protection features such as over-temperature, over-voltage, and over-current protection enhance system reliability.

Advantages and Disadvantages

Advantages: - Low power consumption - High efficiency - Wide input voltage range - Integrated protection features - Simplified circuit design

Disadvantages: - Limited output power (up to 3W) - Requires careful thermal management in high-temperature environments

Working Principles

The LNK304DN utilizes a flyback converter topology to provide power conversion. It operates in a primary-side control mode, where the feedback signal is derived from the primary side of the transformer. This eliminates the need for an optocoupler and simplifies the circuit design.

The IC regulates the output voltage by adjusting the duty cycle of the internal power MOSFET. The feedback pin (FB) monitors the output voltage and provides the necessary control signals to maintain a stable output.

In the event of a fault condition, such as over-temperature or over-current, the auto-restart protection feature ensures that the IC automatically resumes operation once the fault is cleared.

Detailed Application Field Plans

The LNK304DN is commonly used in various low-power applications, including:

1. LED Lighting: The IC can be used in LED drivers for efficient and reliable illumination.
2. Home Appliances: It can be employed in power supplies for small household appliances like smart speakers, IoT devices, and electronic toys.
3. Industrial Control Systems: The IC finds application in power management circuits for industrial control systems, ensuring stable and efficient operation.

Alternative Models

For similar power management requirements, alternative models to the LNK304DN include:

1. LNK302DN
2. LNK303DN
3. LNK305DN

These models offer similar functionality and characteristics, providing flexibility in choosing the most suitable option for specific applications.

In conclusion, the LNK304DN is a power management IC that offers low power consumption, high efficiency, and integrated protection features. Its primary-side control mode and simplified circuit design make it suitable for various low-power applications. With its wide input voltage range and accurate output voltage regulation, the LNK304DN provides reliable power conversion.