LM3421Q1MHX/NOPB

Product Overview

Category: Integrated Circuit (IC)

Use: The LM3421Q1MHX/NOPB is a high-performance LED driver IC designed for driving LEDs in various lighting applications.

Characteristics: - High efficiency - Wide input voltage range - Adjustable output current - Dimming control options - Over-temperature protection - Under-voltage lockout

Package: The LM3421Q1MHX/NOPB is available in a small outline package (SOP) with 8 pins.

Essence: This IC provides efficient and reliable LED driving capabilities, enabling the design of energy-efficient lighting systems.

Packaging/Quantity: The LM3421Q1MHX/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
• Operating Temperature Range: -40°C to 125°C

Pin Configuration

The LM3421Q1MHX/NOPB has the following pin configuration:

1. VIN: Input voltage pin
2. GND: Ground pin
3. CS: Current sense pin
4. DIM: Dimming control pin
5. VCC: Supply voltage pin
6. SW: Switch node pin
7. FB: Feedback pin
8. EN: Enable pin

Functional Features

• High Efficiency: The LM3421Q1MHX/NOPB utilizes a high-efficiency switching regulator to minimize power losses and maximize energy conversion.
• Wide Input Voltage Range: The IC can operate within a wide range of input voltages, making it suitable for various lighting applications.
• Adjustable Output Current: The output current can be easily adjusted to meet the requirements of different LED configurations.
• Dimming Control Options: The LM3421Q1MHX/NOPB supports various dimming control methods, including analog and PWM dimming.
• Over-Temperature Protection: The IC incorporates thermal shutdown protection to prevent damage due to excessive temperature.
• Under-Voltage Lockout: The under-voltage lockout feature ensures proper operation even at low input voltages.

Advantages and Disadvantages

Advantages: - High efficiency leads to energy savings - Wide input voltage range allows for versatile applications - Adjustable output current provides flexibility - Dimming control options enable lighting customization - Over-temperature protection enhances reliability - Under-voltage lockout ensures stable operation

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

Working Principles

The LM3421Q1MHX/NOPB operates as a switching regulator, converting the input voltage to a regulated output current suitable for driving LEDs. It utilizes a pulse-width modulation (PWM) control scheme to regulate the LED current. The feedback pin (FB) monitors the LED current and adjusts the duty cycle of the internal switch accordingly. This enables precise control over the LED brightness.

Detailed Application Field Plans

The LM3421Q1MHX/NOPB is widely used in various lighting applications, including: - Indoor and outdoor LED lighting systems - Automotive lighting - Signage and display lighting - Backlighting for LCD panels - Architectural lighting

Detailed and Complete Alternative Models

• LM3409: Similar LED driver IC with higher maximum output current (up to 3A)
• LM3410: LED driver IC with integrated boost converter for higher voltage applications
• LM3429: LED driver IC with integrated power factor correction (PFC) for improved efficiency

These alternative models offer different features and capabilities, allowing designers to choose the most suitable option for their specific requirements.

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