LM3421Q1MH/NOPB

Product Overview

Category: Integrated Circuit (IC)

Use: The LM3421Q1MH/NOPB is a high-performance LED driver IC designed for driving LEDs in various lighting applications.

Characteristics: - High efficiency - Wide input voltage range - Dimming control capability - Over-temperature protection - Short-circuit protection

Package: The LM3421Q1MH/NOPB is available in a small outline package (SOP) with 8 pins.

Essence: This IC is essential for controlling the current flow to LEDs, ensuring optimal performance and longevity.

Packaging/Quantity: The LM3421Q1MH/NOPB is typically sold in reels containing 2500 units.

Specifications

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

Pin Configuration

The LM3421Q1MH/NOPB has the following pin configuration:

1. VIN: Input voltage
2. GND: Ground
3. VCC: Supply voltage for internal circuitry
4. DIM: Dimming control input
5. FB: Feedback pin for regulating output current
6. SW: Switch node for connecting to the LED load
7. NC: No connection
8. EN: Enable pin for turning on/off the IC

Functional Features

• High-efficiency operation, reducing power dissipation
• Wide input voltage range allows for versatile applications
• Dimming control capability enables brightness adjustment
• Over-temperature protection ensures safe operation
• Short-circuit protection prevents damage to the IC and LEDs

Advantages and Disadvantages

Advantages: - High efficiency leads to energy savings - Wide input voltage range allows for flexibility in design - Dimming control enables customization of lighting levels - Over-temperature and short-circuit protection enhance reliability

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

Working Principles

The LM3421Q1MH/NOPB operates as a constant current LED driver. It regulates the current flowing through the LEDs by adjusting the duty cycle of the internal switching regulator. The feedback pin (FB) monitors the LED current and adjusts the duty cycle accordingly to maintain a constant current.

Detailed Application Field Plans

The LM3421Q1MH/NOPB is suitable for various lighting applications, including: - Automotive lighting - Industrial lighting - Street lighting - Signage lighting - Architectural lighting

Detailed and Complete Alternative Models

• LM3409: Similar LED driver IC with higher output current capability
• LM3410: LED driver IC with integrated boost converter
• LM3429: LED driver IC with synchronous buck-boost topology

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

In conclusion, the LM3421Q1MH/NOPB is a high-performance LED driver IC that offers efficient and reliable control of LED lighting. Its wide input voltage range, dimming control capability, and built-in protections make it suitable for various lighting applications. While it has some limitations in terms of output current range, there are alternative models available to meet specific needs.