LM3423MHX/NOPB

Product Overview

• Category: Integrated Circuit (IC)
• Use: LED Driver
• Characteristics: High efficiency, adjustable current, wide input voltage range
• Package: PowerPAD HTSSOP-20
• Essence: This IC is designed to drive high-power LEDs efficiently and reliably.
• Packaging/Quantity: Available in tape and reel packaging, with 250 units per reel.

Specifications

• Input Voltage Range: 4.5V to 75V
• Output Current Range: Up to 1.5A
• Switching Frequency: Adjustable up to 2MHz
• Dimming Control: Analog/PWM
• Thermal Shutdown Protection: Yes
• Operating Temperature Range: -40°C to +125°C

Pin Configuration

The LM3423MHX/NOPB IC has the following pin configuration:

1. VIN: Input voltage
2. GND: Ground reference
3. VCC: Supply voltage for internal circuitry
4. CS: Current sense input
5. DIM: Dimming control input
6. FB: Feedback voltage input
7. EN: Enable control input
8. AGND: Analog ground
9. SW: Switch node connection
10. PGND: Power ground
11. BST: Bootstrap capacitor connection
12. RT: External resistor for switching frequency adjustment
13. SS: Soft-start capacitor connection
14. COMP: Compensation network connection
15. VREF: Reference voltage output
16. ADJ: Output current adjustment
17. ISET: Output current setting
18. NC: No connect
19. NC: No connect
20. NC: No connect

Functional Features

• High efficiency conversion of input voltage to LED current
• Wide input voltage range allows for versatile applications
• Adjustable output current to accommodate different LED configurations
• Dimming control options for brightness adjustment
• Thermal shutdown protection prevents overheating

Advantages and Disadvantages

Advantages: - High efficiency results in reduced power consumption - Wide input voltage range enables compatibility with various power sources - Adjustable output current allows for flexibility in LED configurations - Dimming control provides brightness customization - Thermal shutdown protection ensures safe operation

Disadvantages: - Limited maximum output current of 1.5A may not be suitable for high-power LED applications - Requires external components for proper operation - Relatively small package size may pose challenges during assembly

Working Principles

The LM3423MHX/NOPB is a buck LED driver IC that utilizes a switching regulator topology to efficiently drive high-power LEDs. It converts the input voltage to a regulated current, which is then supplied to the LED load. The IC incorporates a feedback loop to maintain a constant output current, ensuring consistent brightness levels.

The dimming control feature allows for adjusting the LED brightness by varying the duty cycle of the PWM signal or the analog control voltage. This enables dynamic lighting effects and energy savings.

Detailed Application Field Plans

The LM3423MHX/NOPB is suitable for a wide range of LED lighting applications, including:

1. General lighting: Residential, commercial, and industrial lighting fixtures.
2. Automotive lighting: Headlights, taillights, and interior lighting.
3. Display backlighting: LCD TVs, monitors, and signage.
4. Outdoor lighting: Streetlights, floodlights, and landscape lighting.
5. Architectural lighting: Accent lighting, façade illumination, and decorative lighting.

Detailed and Complete Alternative Models

1. LM3409HV/NOPB: Similar functionality with higher maximum output current (up to 3A).
2. LM3410X/NOPB: Lower maximum output current (up to 1A) but smaller package size.
3. LM3429MH/NOPB: Integrated boost-buck LED driver with additional features.

These alternative models offer different specifications and package options, allowing for customization based on specific application requirements.

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