LNK576DG

Product Overview

Category: Integrated Circuit (IC)

Use: Power Management IC

Characteristics: - Low power consumption - High efficiency - Compact size - Wide input voltage range - Over-temperature protection - Over-voltage protection - Short-circuit protection

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

Essence: LNK576DG is a power management IC designed to provide efficient and reliable power conversion in various electronic devices.

Packaging/Quantity: LNK576DG is typically sold in reels of 2500 units per reel.

Specifications

• Input Voltage Range: 85V AC to 265V AC
• Output Voltage: 5V DC
• Output Current: Up to 1A
• Efficiency: >80%
• Operating Temperature Range: -40°C to +150°C

Detailed Pin Configuration

LNK576DG follows the standard DIP-8 pin configuration:

1. VDD: Power supply input
2. GND: Ground reference
3. FB: Feedback pin for output voltage regulation
4. BP: Bypass pin for frequency jittering
5. D: Drain pin for primary side control
6. S: Source pin for primary side control
7. NC: No connection
8. VOUT: Output voltage pin

Functional Features

• Primary-side control eliminates the need for an optocoupler or secondary-side feedback circuitry.
• Auto-restart feature ensures continuous operation even in the event of a fault condition.
• Frequency jittering reduces EMI emissions.
• Built-in protection features safeguard against over-temperature, over-voltage, and short-circuit conditions.

Advantages and Disadvantages

Advantages: - High efficiency leads to reduced power consumption. - Compact size allows for space-saving designs. - Wide input voltage range enables compatibility with various power sources. - Over-temperature, over-voltage, and short-circuit protection enhance device reliability.

Disadvantages: - Limited output current may not be suitable for high-power applications. - Lack of adjustable output voltage may restrict certain design requirements.

Working Principles

LNK576DG utilizes primary-side control to regulate the output voltage. It operates by sensing the feedback voltage through the FB pin and adjusting the duty cycle of the internal power switch accordingly. This control method eliminates the need for an optocoupler or secondary-side feedback circuitry, simplifying the overall design and reducing costs.

The IC incorporates a frequency jittering technique that modulates the switching frequency slightly, reducing electromagnetic interference (EMI) emissions and meeting regulatory standards.

In the event of a fault condition such as over-temperature, over-voltage, or short-circuit, the auto-restart feature ensures continuous operation by attempting to restart the power conversion process after a brief shutdown period.

Detailed Application Field Plans

LNK576DG finds application in various electronic devices requiring efficient power management, including but not limited to: - LED lighting systems - Home appliances - Industrial equipment - Consumer electronics - Power adapters

Detailed and Complete Alternative Models

1. LNK577DG: Similar to LNK576DG, but with higher output current capability (up to 2A).
2. LNK578DG: Enhanced version with additional features such as dimming control and synchronization capabilities.
3. LNK579DG: Higher voltage variant designed for specific applications requiring an extended input voltage range.

These alternative models offer flexibility and cater to different power requirements and design specifications.

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