LT3754EUH#TRPBF

Product Overview

Category: Integrated Circuit (IC)

Use: The LT3754EUH#TRPBF is a high voltage, synchronous, current mode step-down LED driver. It is designed to drive LEDs with a constant current, making it suitable for various lighting applications.

Characteristics: - High voltage input range - Synchronous rectification - Current mode control - Adjustable switching frequency - Dimming capability - Thermal shutdown protection

Package: The LT3754EUH#TRPBF is available in a 32-pin QFN package.

Essence: This IC provides efficient and reliable LED driving capabilities, ensuring consistent brightness and optimal performance.

Packaging/Quantity: The LT3754EUH#TRPBF is typically sold in reels containing 250 units.

Specifications

• Input Voltage Range: 4V to 60V
• Output Current Range: Up to 20A
• Switching Frequency Range: 100kHz to 1MHz
• Dimming Control: Analog/PWM
• Operating Temperature Range: -40°C to 125°C

Pin Configuration

The LT3754EUH#TRPBF features the following pin configuration:

1. VIN: Input Voltage
2. VCC: Supply Voltage
3. GND: Ground
4. SW: Switch Node
5. FB: Feedback Pin
6. RT: Timing Resistor
7. CT: Timing Capacitor
8. SYNC: Synchronization Input
9. DIM: Dimming Control Input
10. ADJ: Output Voltage Adjustment
11. SS: Soft-Start Pin
12. PGND: Power Ground
13. LX: Inductor Connection
14. BST: Bootstrap Capacitor Connection
15. VOUT: Output Voltage
16. ITH: Current Sense Threshold
17. ISET: LED Current Set Pin 18-32. NC: No Connection

Functional Features

• High voltage input range allows for versatile applications.
• Synchronous rectification improves efficiency and reduces power losses.
• Current mode control ensures stable LED current regulation.
• Adjustable switching frequency enables optimization for different operating conditions.
• Dimming capability provides flexibility in controlling LED brightness.
• Thermal shutdown protection prevents damage due to excessive temperature.

Advantages and Disadvantages

Advantages: - Wide input voltage range accommodates various power sources. - Efficient synchronous rectification minimizes power dissipation. - Precise current regulation ensures consistent LED brightness. - Flexible dimming control options allow for customized lighting effects. - Robust thermal protection enhances reliability.

Disadvantages: - Limited maximum output current may not be suitable for high-power LED applications. - Complex pin configuration may require careful PCB layout design.

Working Principles

The LT3754EUH#TRPBF operates as a step-down LED driver using a current mode control scheme. It regulates the LED current by adjusting the duty cycle of the internal switch. The input voltage is stepped down to the desired level, and the current flowing through the LEDs is controlled to maintain constant brightness.

The IC incorporates synchronous rectification, which improves efficiency by reducing power losses during switching transitions. It also features dimming control, allowing the LED brightness to be adjusted using either analog or PWM signals.

Thermal shutdown protection ensures that the IC shuts down if the temperature exceeds a safe threshold, preventing damage to the device and connected LEDs.

Detailed Application Field Plans

The LT3754EUH#TRPBF can be used in various lighting applications, including: 1. Automotive lighting systems 2. Industrial lighting fixtures 3. Architectural lighting 4. Signage and display lighting 5. Backlighting for LCD panels 6. Outdoor and street lighting

Detailed and Complete Alternative Models

1. LT3794EUH#TRPBF: Similar to LT3754EUH#TRPBF, but with higher maximum output current (up to 30A).
2. LT3763EUH#TRPBF: Step-down LED driver with integrated boost converter for driving high-power LEDs.
3. LT3957EUH#TRPBF: High voltage, synchronous, step-down LED driver with integrated fault protection features.

These alternative models offer different specifications and features to cater to specific application requirements.

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