LM3421MH/NOPB

Product Overview

Category: Integrated Circuit (IC)

Use: The LM3421MH/NOPB is a high-performance LED driver IC designed for driving LEDs in various lighting applications. It provides efficient and precise control of LED current, enabling optimal brightness and energy efficiency.

Characteristics: - High efficiency - Wide input voltage range - Adjustable LED current - Dimming capability - Over-temperature protection - Under-voltage lockout

Package: The LM3421MH/NOPB is available in a small outline package (SOP) with 8 pins.

Essence: This IC is essential for controlling the current flowing through LEDs, ensuring their proper operation and maximizing their lifespan.

Packaging/Quantity: The LM3421MH/NOPB is typically sold in reels containing 250 units per reel.

Specifications

• Input Voltage Range: 4.5V to 75V
• Output Current Range: Up to 1A
• Switching Frequency: Adjustable up to 2MHz
• Operating Temperature Range: -40°C to +125°C

Pin Configuration

The LM3421MH/NOPB has the following pin configuration:

1. VIN: Input voltage
2. GND: Ground
3. FB: Feedback pin for setting LED current
4. DIM: Dimming control input
5. EN: Enable pin for turning on/off the IC
6. SW: Switch node for connecting the inductor
7. VCC: Supply voltage for internal circuitry
8. COMP: Compensation pin for stability control

Functional Features

• Constant current regulation for LED driving
• Adjustable LED current through feedback pin
• Dimming control for brightness adjustment
• Efficient switching regulator design
• Protection against over-temperature conditions
• Under-voltage lockout for reliable operation

Advantages and Disadvantages

Advantages: - High efficiency leads to energy savings - Wide input voltage range allows for versatile applications - Adjustable LED current enables flexibility in lighting design - Dimming capability provides brightness control - Over-temperature protection ensures reliability - Under-voltage lockout prevents improper operation

Disadvantages: - Limited output current range (up to 1A) - Requires external components for complete LED driver circuit

Working Principles

The LM3421MH/NOPB operates as a switching regulator, converting the input voltage to a regulated current for driving LEDs. It uses a feedback mechanism to maintain a constant LED current, regardless of input voltage variations. The dimming control input allows for adjusting the LED brightness by modulating the duty cycle of the switching waveform.

Detailed Application Field Plans

The LM3421MH/NOPB is suitable for various lighting applications, including: - General illumination - Automotive lighting - Architectural lighting - Signage and display lighting - Industrial lighting

Detailed and Complete Alternative Models

• LM3409: Similar LED driver IC with higher output current capability (up to 3A)
• LM3410: LED driver IC with integrated boost converter for higher voltage applications
• LM3429: LED driver IC with dual-channel output for driving multiple LEDs simultaneously
• LT3474: LED driver IC with additional features like fault protection and synchronization capability

These alternative models offer different specifications and features, providing options for specific application requirements.

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