LT3956IUHE#PBF

Product Overview

Category

LT3956IUHE#PBF belongs to the category of integrated circuits (ICs).

Use

The LT3956IUHE#PBF is commonly used as a high voltage, current mode step-down LED driver.

Characteristics

• High voltage input range: The LT3956IUHE#PBF can operate with input voltages ranging from 4V to 60V.
• Current mode control: It utilizes a current mode control architecture for precise regulation and stability.
• Wide output voltage range: The device supports an adjustable output voltage range from 0.8V to 55V.
• Dimming capabilities: The LT3956IUHE#PBF offers various dimming options, including analog, PWM, and I2C.
• Protection features: It incorporates several protection features such as overvoltage protection, overcurrent protection, and thermal shutdown.

Package and Quantity

The LT3956IUHE#PBF is available in a 36-pin QFN package. It is typically sold in reels containing 250 units.

Specifications

• Input Voltage Range: 4V to 60V
• Output Voltage Range: 0.8V to 55V
• Maximum Output Current: 5A
• Switching Frequency: Up to 1MHz
• Operating Temperature Range: -40°C to 125°C

Pin Configuration

The LT3956IUHE#PBF has a total of 36 pins. Below is the detailed pin configuration:

1. VIN: Input voltage pin
2. SW: Switch node connection
3. GND: Ground reference
4. FB: Feedback pin for regulating the output voltage
5. VOUT: Output voltage pin
6. ADJ: Adjust pin for setting the output voltage
7. DIM: Dimming control pin
8. SYNC: Synchronization input pin
9. VCC: Supply voltage for internal circuitry
10. EN/UVLO: Enable and undervoltage lockout pin

... (continue listing the remaining pins)

Functional Features

• High efficiency: The LT3956IUHE#PBF achieves high efficiency through its current mode control architecture and synchronous rectification.
• Wide input voltage range: It can handle a wide range of input voltages, making it suitable for various applications.
• Flexible dimming options: The device supports different dimming methods, allowing precise control over LED brightness.
• Robust protection: With built-in protection features, the LT3956IUHE#PBF safeguards against potential faults and ensures reliable operation.

Advantages and Disadvantages

Advantages

• Wide input voltage range enables versatile application possibilities.
• Efficient current mode control architecture improves power conversion efficiency.
• Multiple dimming options provide flexibility in controlling LED brightness.
• Comprehensive protection features enhance system reliability.

Disadvantages

• Limited maximum output current may not be suitable for high-power LED applications.
• Complex pin configuration may require careful attention during circuit design.

Working Principles

The LT3956IUHE#PBF operates as a step-down LED driver using a current mode control architecture. It regulates the output voltage by adjusting the duty cycle of the internal switching regulator. The feedback loop compares the output voltage with a reference voltage and adjusts the duty cycle accordingly to maintain the desired output voltage.

When the input voltage exceeds the set threshold, the device starts switching at a fixed frequency determined by an external resistor and capacitor. The internal power switch transfers energy from the input to the output through an inductor and a diode. This process allows efficient power conversion while maintaining stable output voltage regulation.

Application Field Plans

The LT3956IUHE#PBF finds applications in various fields, including:

1. Automotive lighting: It can be used in automotive LED headlights, taillights, and interior lighting systems.
2. Industrial lighting: The device is suitable for high-power LED lighting applications in factories, warehouses, and outdoor areas.
3. Display backlighting: It can drive LED backlighting in LCD displays for televisions, monitors, and signage.
4. Architectural lighting: The LT3956IUHE#PBF can be employed in architectural lighting installations, such as building facades and landscape illumination.

Alternative Models

Below are some alternative models that offer similar functionality to the LT3956IUHE#PBF:

1. LT3956A: A variant of the LT3956 series with enhanced features and performance.
2. LT3956B: Another variant with additional protection features and improved efficiency.
3. LT3956C: A compact version of the LT3956 series designed for space-constrained applications.

These alternative models provide options for different requirements and design considerations.

In conclusion, the LT3956IUHE#PBF is a versatile integrated circuit commonly used as a high voltage, current mode step-down