IS31LT3505-SLS2-TR

Product Overview

Category

The IS31LT3505-SLS2-TR belongs to the category of integrated circuits (ICs) specifically designed for LED lighting applications.

Use

This product is primarily used for driving and controlling LEDs in various lighting systems, such as backlighting for LCD displays, automotive lighting, and general illumination.

Characteristics

• High efficiency: The IS31LT3505-SLS2-TR offers high power conversion efficiency, ensuring optimal energy utilization.
• Compact package: It comes in a small form factor package, making it suitable for space-constrained applications.
• Wide input voltage range: The IC can operate with a wide input voltage range, allowing flexibility in different power supply configurations.
• Dimming control: It provides dimming control options, enabling adjustable brightness levels for LED lighting systems.
• Over-temperature protection: The product incorporates over-temperature protection mechanisms to prevent damage due to excessive heat.

Package and Quantity

The IS31LT3505-SLS2-TR is available in a surface-mount package. It is typically supplied in reels or tape and reel packaging, with a quantity of 3000 units per reel.

Specifications

• Input Voltage Range: 4.5V to 40V
• Output Current: Up to 1A
• Switching Frequency: 1MHz
• Dimming Control: PWM or Analog
• Operating Temperature Range: -40°C to +85°C
• Package Type: SOT23-6

Pin Configuration

The IS31LT3505-SLS2-TR has a six-pin SOT23 package with the following pin configuration:

____ VCC| |GND EN | |DIM FB | |SW NC | |NC |____|

• VCC: Power supply input
• GND: Ground reference
• EN: Enable pin for turning the IC on/off
• DIM: Dimming control pin (PWM or analog input)
• FB: Feedback pin for regulating output voltage/current
• SW: Switching node for connecting to the LED load
• NC: Not connected (unused pin)

Functional Features

The IS31LT3505-SLS2-TR offers several functional features that enhance its performance and usability:

1. High-efficiency Boost Converter: The integrated boost converter efficiently steps up the input voltage to provide the required voltage for driving LEDs.
2. Adjustable Dimming Control: The IC supports both PWM and analog dimming control methods, allowing precise adjustment of LED brightness.
3. Over-Temperature Protection: The built-in over-temperature protection circuitry safeguards the IC from excessive heat, ensuring reliable operation.
4. Soft Start Function: The soft start feature prevents inrush current during power-up, protecting the IC and connected LEDs.
5. Under-Voltage Lockout (UVLO): The UVLO function ensures proper operation by disabling the IC when the input voltage falls below a specified threshold.

Advantages and Disadvantages

Advantages

• High efficiency leads to energy savings and reduced power consumption.
• Compact package size enables integration into space-constrained designs.
• Wide input voltage range allows compatibility with various power supply configurations.
• Dimming control options offer flexibility in adjusting LED brightness.
• Over-temperature protection ensures reliability and longevity.

Disadvantages

• Limited output current capacity may not be suitable for high-power LED applications.
• Requires external components for proper operation, increasing overall system complexity.

Working Principles

The IS31LT3505-SLS2-TR operates as a boost converter, converting the input voltage to a higher voltage suitable for driving LEDs. It utilizes a switching regulator topology to efficiently step up the voltage while maintaining high power conversion efficiency. The feedback mechanism ensures stable output voltage/current, while the dimming control circuitry allows adjustable brightness levels.

Application Field Plans

The IS31LT3505-SLS2-TR finds applications in various lighting systems, including:

1. LCD Backlighting: It can be used to drive LEDs for backlighting LCD displays in consumer electronics, such as smartphones, tablets, and televisions.
2. Automotive Lighting: The IC is suitable for automotive lighting applications, including interior lighting, dashboard illumination, and exterior lighting.
3. General Illumination: It can be employed in general lighting applications, such as residential and commercial lighting fixtures, providing energy-efficient illumination.

Alternative Models

For users seeking alternative options, the following models offer similar functionality to the IS31LT3505-SLS2-TR:

1. MP3302 by Monolithic Power Systems
2. TPS61165 by Texas Instruments
3. LT3474 by Linear Technology

These alternative models provide comparable features and specifications, allowing users to choose the most suitable option for their specific requirements.

In conclusion, the IS31LT350