LT3797ELXE#PBF

Product Overview

• Category: Integrated Circuit (IC)
• Use: LED Driver
• Characteristics: High Efficiency, Wide Input Voltage Range, Dimming Control
• Package: 38-Lead Exposed Pad TSSOP
• Essence: Power Management IC for LED Lighting Applications
• Packaging/Quantity: Tape & Reel, 250 units per reel

Specifications

• Input Voltage Range: 4.5V to 60V
• Output Current: Up to 100mA
• Switching Frequency: Up to 2MHz
• Dimming Control: Analog/PWM
• Operating Temperature Range: -40°C to 125°C

Detailed Pin Configuration

1. VIN: Input Voltage
2. GND: Ground
3. VCC: Supply Voltage for Internal Circuitry
4. FB: Feedback Pin for Output Regulation
5. EN/UVLO: Enable/Input Undervoltage Lockout
6. DIM: Dimming Control Input
7. SW: Switch Node Connection
8. LX: Inductor Connection
9. AGND: Analog Ground
10. PGND: Power Ground
11. ISET: Current Sense Resistor Connection
12. SS/TRK: Soft-Start/Tracking Control
13. SYNC: Synchronization Input
14. RT/CLKOUT: Oscillator Timing Resistor/Clock Output
15. CLKIN: External Clock Input
16. CLKOUT: Clock Output
17. VREF: Reference Voltage Output
18. VSENSE: Voltage Sense Input
19. VOUT: Output Voltage
20. NC: No Connect
21. NC: No Connect
22. NC: No Connect
23. NC: No Connect
24. NC: No Connect
25. NC: No Connect
26. NC: No Connect
27. NC: No Connect
28. NC: No Connect
29. NC: No Connect
30. NC: No Connect
31. NC: No Connect
32. NC: No Connect
33. NC: No Connect
34. NC: No Connect
35. NC: No Connect
36. NC: No Connect
37. NC: No Connect
38. NC: No Connect

Functional Features

• High Efficiency LED Driver
• Wide Input Voltage Range for Versatile Applications
• Dimming Control for Adjustable Brightness
• Internal Compensation for Simplified Design
• Programmable Soft-Start and Tracking Control
• Synchronization Capability for Multi-Channel Operation
• Overvoltage and Overtemperature Protection

Advantages and Disadvantages

Advantages

• High efficiency results in energy savings
• Wide input voltage range allows for flexibility in different applications
• Dimming control enables adjustable brightness levels
• Internal compensation simplifies design process
• Programmable soft-start and tracking control for smooth operation
• Synchronization capability for multi-channel LED lighting systems
• Overvoltage and overtemperature protection ensure device safety

Disadvantages

• Limited output current of up to 100mA may not be suitable for high-power LED applications
• Package size may not be ideal for space-constrained designs

Working Principles

The LT3797ELXE#PBF is a power management IC specifically designed for LED lighting applications. It operates by converting the input voltage into a regulated output voltage suitable for driving LEDs. The IC utilizes a high-efficiency switching regulator topology to achieve maximum power conversion efficiency.

The dimming control feature allows the user to adjust the brightness of the LEDs by varying the duty cycle of the PWM signal or the analog control voltage applied to the DIM pin. This enables dynamic lighting effects and energy savings.

The LT3797ELXE#PBF incorporates internal compensation, which simplifies the design process by eliminating the need for external compensation components. It also features programmable soft-start and tracking control to ensure smooth startup and operation of the LED driver.

To protect the IC and the LEDs, the LT3797ELXE#PBF includes overvoltage and overtemperature protection mechanisms. These safeguards prevent damage to the device and ensure reliable operation in various conditions.

Detailed Application Field Plans

The LT3797ELXE#PBF is suitable for a wide range of LED lighting applications, including:

1. General Lighting: Residential, commercial, and industrial lighting solutions.
2. Automotive Lighting: Interior and exterior lighting for vehicles.
3. Display Backlighting: LCD monitors, televisions, and signage.
4. Architectural Lighting: Accent lighting, façade illumination, and landscape lighting.
5. Street Lighting: Efficient and long-lasting LED streetlights.
6. Emergency Lighting: Battery-powered emergency lighting systems.
7. Entertainment Lighting: Stage lighting, event lighting, and theatrical effects.

Detailed and Complete Alternative Models

• LT3797