LM2794TL

Product Overview

Category: Integrated Circuit (IC)

Use: Power Management IC for LED Backlighting

Characteristics: - High efficiency - Wide input voltage range - Adjustable output current - Dimming control - Overvoltage protection - Thermal shutdown protection

Package: Thin Shrink Small Outline Package (TSSOP)

Essence: The LM2794TL is a power management IC specifically designed for LED backlighting applications. It provides efficient and adjustable current to drive LEDs, ensuring optimal performance and energy savings.

Packaging/Quantity: The LM2794TL is available in TSSOP package with 20 pins. It is typically sold in reels of 2500 units.

Specifications

• Input Voltage Range: 2.7V to 5.5V
• Output Current Range: 10mA to 200mA
• Dimming Control: PWM or DC voltage control
• Efficiency: Up to 92%
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The LM2794TL has a total of 20 pins. The pin configuration is as follows:

1. EN (Enable)
2. GND (Ground)
3. VIN (Input Voltage)
4. VOUT (Output Voltage)
5. FB (Feedback)
6. DIM (Dimming Control)
7. NC (No Connection)
8. NC (No Connection)
9. NC (No Connection)
10. NC (No Connection)
11. NC (No Connection)
12. NC (No Connection)
13. NC (No Connection)
14. NC (No Connection)
15. NC (No Connection)
16. NC (No Connection)
17. NC (No Connection)
18. NC (No Connection)
19. NC (No Connection)
20. NC (No Connection)

Functional Features

1. High Efficiency: The LM2794TL offers high efficiency, ensuring minimal power loss and maximizing energy savings.

2. Wide Input Voltage Range: It can operate within a wide input voltage range of 2.7V to 5.5V, making it suitable for various applications.

3. Adjustable Output Current: The output current can be easily adjusted from 10mA to 200mA, allowing flexibility in LED backlighting designs.

4. Dimming Control: The IC supports both PWM and DC voltage control for dimming the LED backlight, providing brightness control options.

5. Overvoltage Protection: The LM2794TL incorporates overvoltage protection, safeguarding the LEDs from potential damage due to excessive voltage.

6. Thermal Shutdown Protection: In case of excessive temperature rise, the IC automatically shuts down to prevent overheating and ensure safe operation.

Advantages and Disadvantages

Advantages: - High efficiency leads to energy savings - Wide input voltage range allows versatility - Adjustable output current provides flexibility - Dimming control options for brightness adjustment - Overvoltage and thermal shutdown protection enhance reliability

Disadvantages: - Limited to LED backlighting applications - Requires additional external components for complete circuit implementation

Working Principles

The LM2794TL operates as a buck converter, converting the input voltage to a lower regulated output voltage suitable for driving LEDs. It utilizes a pulse-width modulation (PWM) technique to control the output current and achieve dimming functionality. The IC incorporates a feedback mechanism to regulate the output current based on the desired brightness level set by the dimming control signal.

Detailed Application Field Plans

The LM2794TL is primarily used in LED backlighting applications, including but not limited to: - LCD monitors and televisions - Automotive displays - Handheld devices (smartphones, tablets) - Industrial control panels - Signage and advertising displays

Detailed and Complete Alternative Models

1. LM2794TLX: Similar to LM2794TL, but with extended temperature range (-40°C to +125°C).
2. LM2794TL-Q1: Automotive-grade version of LM2794TL, designed for harsh operating conditions and compliance with automotive standards.
3. LM2794TLX-Q1: Automotive-grade version of LM2794TLX, combining extended temperature range and automotive specifications.

These alternative models offer similar functionality and characteristics as the LM2794TL, catering to specific application requirements or environmental conditions.

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