Overview
The TLC5917IDR is an 8-bit constant current LED sink driver manufactured by Texas Instruments. Designed for applications requiring precise LED control, this IC is ideal for display backlighting, signage, and general-purpose LED driving. The TLC5917IDR integrates an 8-bit shift register, data latch, and constant current output, ensuring reliable and efficient LED operation. Its market positioning targets industrial, automotive, and consumer electronics applications, offering a robust solution for high-performance LED driving. The product stands out for its high accuracy, low power consumption, and ease of integration into various systems.
Key Specifications
| Parameter | Value | Unit | Notes |
|---|---|---|---|
| Number of Outputs | 8 | - | 8-bit constant current sink |
| Output Current | 20 | mA | Adjustable via external resistor |
| Supply Voltage | 3.0 to 5.5 | V | Wide operating range |
| Data Transfer Rate | 25 | MHz | High-speed data transfer |
| Operating Temperature | -40 to 85 | °C | Industrial-grade |
| Package | SOIC-16 | - | Surface mount |
| Current Accuracy | ±3 | % | High precision |
| ESD Protection | ±2 | kV | HBM (Human Body Model) |
Key Features
- 8-bit constant current LED sink: Ensures uniform brightness across multiple LEDs.
- Adjustable output current: Set via an external resistor for flexibility.
- High-speed data transfer: Supports up to 25 MHz for rapid updates.
- Low power consumption: Optimized for energy-efficient designs.
- Wide operating voltage range: Compatible with 3.0V to 5.5V systems.
- Industrial temperature range: Reliable performance in harsh environments.
Applications
The TLC5917IDR is widely used in various applications, including:
- Display backlighting: Provides consistent brightness for LCD and LED displays.
- Signage: Drives LEDs in indoor and outdoor advertising displays.
- Automotive lighting: Supports interior and exterior lighting systems.
- General-purpose LED driving: Ideal for decorative and functional lighting.
- Industrial control panels: Ensures reliable indicator LED operation.
Q & A
1. What is the maximum output current of the TLC5917IDR?
The maximum output current per channel is 20 mA, adjustable via an external resistor.
2. What is the operating voltage range?
The TLC5917IDR operates from 3.0V to 5.5V.
3. Can this IC drive multiple LEDs simultaneously?
Yes, it can drive up to 8 LEDs independently or in combination.
4. Is the TLC5917IDR suitable for automotive applications?
Yes, its industrial temperature range and robust design make it suitable for automotive lighting.
5. How is the output current adjusted?
The output current is set using an external resistor connected to the IREF pin.
6. What is the data transfer rate?
The data transfer rate is up to 25 MHz, enabling fast LED updates.
7. Does the TLC5917IDR support daisy-chaining?
Yes, multiple devices can be daisy-chained for driving more LEDs.
8. What package does the TLC5917IDR come in?
It is available in a 16-pin SOIC package.
9. Is ESD protection included?
Yes, it provides ±2 kV ESD protection (HBM).
10. What is the typical current accuracy?
The current accuracy is ±3%, ensuring precise LED control.
