LM3492MH/NOPB

Product Overview

• Category: Integrated Circuit (IC)
• Use: LED Driver
• Characteristics: High Efficiency, Wide Input Voltage Range, Dimmable
• Package: PowerPAD HTSSOP-20
• Essence: LM3492MH/NOPB is a high-performance LED driver IC designed for driving medium to high power LEDs. It provides efficient and reliable control of LED lighting systems.
• Packaging/Quantity: Available in reels of 2500 units.

Specifications

• Input Voltage Range: 4.5V to 75V
• Output Current Range: Up to 1.5A
• Switching Frequency: Adjustable up to 1MHz
• Dimming Control: Analog/PWM
• Protection Features: Over-Temperature, Over-Voltage, and Short-Circuit Protection

Pin Configuration

The LM3492MH/NOPB IC has the following pin configuration:

1. VIN: Input voltage
2. GND: Ground
3. FB: Feedback pin for output voltage regulation
4. EN: Enable pin for turning the IC on/off
5. DIM: Dimming control input
6. VCC: Supply voltage for internal circuitry
7. AGND: Analog ground
8. PGND: Power ground
9. SW: Switch node connection for external inductor
10. LX: Connection to the cathode of the LED string
11. BST: Boost capacitor connection
12. COMP: Compensation pin for loop stability
13. SS: Soft-start capacitor connection
14. RT: External resistor for setting switching frequency
15. CS: Current sense pin
16. OCSET: Over-current protection threshold setting
17. OVP: Over-voltage protection threshold setting
18. TSD: Thermal shutdown pin
19. VREF: Reference voltage output
20. ADJ: Output voltage adjustment

Functional Features

• High Efficiency: The LM3492MH/NOPB utilizes a high-performance boost converter topology, resulting in efficient power conversion and minimal energy loss.
• Wide Input Voltage Range: With an input voltage range of 4.5V to 75V, the IC can be used in a variety of applications with different power sources.
• Dimmable: The LM3492MH/NOPB supports both analog and PWM dimming control, allowing for flexible brightness adjustment of the LED lighting system.
• Protection Features: The IC incorporates over-temperature, over-voltage, and short-circuit protection mechanisms to ensure safe operation and protect the LEDs from damage.

Advantages and Disadvantages

Advantages: - High efficiency leads to energy savings. - Wide input voltage range allows for versatile applications. - Dimming control provides flexibility in adjusting brightness. - Protection features enhance reliability and longevity.

Disadvantages: - Limited maximum output current of 1.5A may not be suitable for high-power LED applications. - Requires external components for operation, increasing complexity.

Working Principles

The LM3492MH/NOPB operates as a boost converter, converting the input voltage to a higher voltage required for driving the LED string. It uses a feedback mechanism to regulate the output voltage and maintain constant current through the LEDs. The dimming control input adjusts the duty cycle of the internal switch, controlling the average current flowing through the LEDs and thus their brightness.

Detailed Application Field Plans

The LM3492MH/NOPB is suitable for various LED lighting applications, including but not limited to: - Indoor and outdoor lighting fixtures - Automotive lighting systems - Streetlights and area lighting - Display backlighting - Signage and architectural lighting

Alternative Models

• LM3409: Similar LED driver IC with higher maximum output current of 3A.
• LM3494: LED driver IC with integrated power factor correction (PFC) functionality.
• LT3799: High-power LED driver IC with built-in fault protection features.

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

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