LT3956EUHE

Basic Information Overview

• Category: Integrated Circuit (IC)
• Use: LED Driver
• Characteristics: High Efficiency, Wide Input Voltage Range, Dimming Control
• Package: 38-Lead 5mm × 7mm QFN
• Essence: Power Management IC for LED Lighting Applications
• Packaging/Quantity: Tape and Reel, 250 units per reel

Specifications

• Input Voltage Range: 4V to 60V
• Output Current: Up to 8A
• Switching Frequency: 100kHz to 1MHz
• 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 Regulation
5. ADJ: Adjust Pin for Setting Output Voltage
6. PWM: Pulse Width Modulation Dimming Control
7. EN/UVLO: Enable/Input Undervoltage Lockout
8. SS/TRK: Soft-Start/Tracking Pin
9. RT: External Resistor for Setting Switching Frequency
10. BST: Boost Pin for Driving External NPN Transistor
11. SW: Switch Node Connection
12. PGND: Power Ground
13. LX: Inductor Connection
14. VOUT: Output Voltage
15. ITH: Current Sense Threshold
16. CTRL: Control Pin for Fault Reporting
17. OVLO: Overvoltage Lockout
18. OCSET: Overcurrent Protection Threshold
19. OVP: Overvoltage Protection
20. AGND: Analog Ground
21. CS+: Positive Terminal of Current Sense Resistor
22. CS-: Negative Terminal of Current Sense Resistor
23. VREF: Reference Voltage Output
24. VSENSE: Sense Pin for Monitoring Output Voltage

Functional Features

• Wide Input Voltage Range allows operation from various power sources
• High Efficiency ensures minimal power loss during LED driving
• Dimming Control options enable brightness adjustment
• Integrated Fault Protection enhances system reliability
• Soft-Start and Tracking feature prevents inrush current during startup

Advantages

• Efficient LED driving with high power conversion efficiency
• Wide input voltage range enables versatile applications
• Dimming control provides flexibility in lighting design
• Comprehensive fault protection safeguards the system
• Compact package size for space-constrained designs

Disadvantages

• Limited maximum output current of 8A may not be suitable for high-power LED applications
• Requires external components for certain functionalities, increasing complexity

Working Principles

The LT3956EUHE is a power management IC designed specifically for LED lighting applications. It operates by converting the input voltage to a regulated output voltage suitable for driving LEDs. The IC incorporates a boost converter topology, which efficiently steps up the input voltage to the desired level. It also features dimming control capabilities, allowing the user to adjust the brightness of the LEDs using either analog or pulse width modulation (PWM) signals.

The IC includes various protection features such as overvoltage lockout (OVLO), overcurrent protection (OCP), and overvoltage protection (OVP). These protections ensure the safety and reliability of the LED driver and the connected LEDs. Additionally, the LT3956EUHE implements soft-start and tracking functionality to prevent excessive inrush current during startup.

Detailed Application Field Plans

The LT3956EUHE is widely used in various LED lighting applications, including: - Indoor and outdoor lighting fixtures - Automotive lighting systems - Streetlights and area lighting - Display backlighting - Architectural lighting - Signage and advertising displays

Detailed and Complete Alternative Models

• LT3956A: Similar functionality with minor differences in specifications
• LT3956B: Enhanced features and improved efficiency compared to LT3956EUHE
• LT3956C: Higher output current capability for demanding LED applications

Note: The above alternative models are from the same product family and offer similar functionality, but may have different specifications and package options.

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