LNK302DG-TL

Product Overview

Category: Integrated Circuit (IC)

Use: Power Management IC

Characteristics: - Low-cost, energy-efficient power conversion solution - Designed for offline flyback converters - Suitable for applications requiring output power up to 5 W - Provides accurate constant voltage (CV) and constant current (CC) regulation

Package: SOT-223

Essence: The LNK302DG-TL is a highly integrated power management IC that offers a cost-effective and energy-efficient solution for offline flyback converters. It provides accurate regulation of constant voltage and constant current, making it suitable for various applications requiring output power up to 5 W.

Packaging/Quantity: The LNK302DG-TL is available in a SOT-223 package. It is typically sold in reels containing a quantity of 2500 units.

Specifications

• Input Voltage Range: 85 VAC to 265 VAC
• Output Power: Up to 5 W
• Output Voltage Range: 3.6 V to 24 V
• Output Current Range: Up to 400 mA
• Frequency Range: 66 kHz to 132 kHz
• Efficiency: Up to 80%
• Operating Temperature Range: -40°C to +150°C

Detailed Pin Configuration

The LNK302DG-TL features a 5-pin configuration:

1. VDD - Power supply input pin.
2. BP/M - Bypass/Multifunction pin. Connects to an external capacitor for bypassing or providing additional functionality.
3. FB - Feedback pin. Connects to the feedback winding of the transformer for voltage regulation.
4. GND - Ground pin.
5. DRAIN - Drain pin. Connects to the primary side of the transformer and provides power to the secondary side.

Functional Features

• Integrated 700 V MOSFET
• Auto-restart protection for overvoltage, overload, and open-loop faults
• Frequency jittering for reduced EMI emissions
• Built-in thermal shutdown protection
• Cycle-by-cycle current limit
• Accurate CV and CC regulation

Advantages and Disadvantages

Advantages: - Cost-effective solution for offline flyback converters - Energy-efficient operation - Wide input voltage range - Accurate constant voltage and constant current regulation - Integrated protection features

Disadvantages: - Limited output power (up to 5 W) - Requires external components for proper operation - Not suitable for high-power applications

Working Principles

The LNK302DG-TL utilizes a flyback converter topology to convert the input AC voltage into a regulated DC output. It incorporates a high-voltage MOSFET that switches the primary side of the transformer. The feedback winding provides information about the output voltage, which is compared to a reference voltage to regulate the output. The IC includes various protection mechanisms such as auto-restart, thermal shutdown, and cycle-by-cycle current limit to ensure safe and reliable operation.

Detailed Application Field Plans

The LNK302DG-TL is commonly used in low-power applications that require efficient power conversion. Some typical application fields include:

1. LED Lighting: The IC can be employed in LED driver circuits for residential and commercial lighting applications.
2. Consumer Electronics: It can be utilized in power supplies for small electronic devices like set-top boxes, routers, and IoT devices.
3. Home Appliances: The IC can be integrated into power management systems for appliances such as refrigerators, air conditioners, and washing machines.
4. Industrial Equipment: It finds application in power supplies for industrial control systems, motor drives, and instrumentation equipment.

Detailed and Complete Alternative Models

1. LNK302DG: Similar to LNK302DG-TL, but available in a TO-220 package.
2. LNK304DG: Offers higher output power capability (up to 10 W) compared to LNK302DG-TL.
3. LNK306DG: Provides extended input voltage range (up to 550 VAC) for applications with higher line voltages.

These alternative models offer similar functionality and can be considered as suitable replacements for the LNK302DG-TL depending on specific requirements.

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