Overview
The TLC5940PWPRG4, produced by Texas Instruments, is a 16-channel constant-current sink LED driver. This component is designed to provide precise control over LED brightness using 12-bit grayscale PWM (Pulse Width Modulation) and 6-bit dot correction. Each channel can be individually adjusted, allowing for a high degree of flexibility in lighting applications. The device features a serial data interface, controlled in-rush current, and error detection mechanisms such as LED open detection (LOD) and thermal error flag (TEF). The TLC5940 is widely used in RGB LED lighting projects, LED signboards, and display backlighting due to its robust technical structure and ease of integration with microcontrollers.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Number of Channels | 16 | - |
| Grayscale PWM Control | 12-bit (4096 steps) | - |
| 6-bit (64 steps) | - | |
| Drive Capability | 0 mA to 60 mA (VCC < 3.6 V), 0 mA to 120 mA (VCC > 3.6 V) | mA |
| LED Power Supply Voltage | Up to 17 V | V |
| VCC Voltage Range | 3 V to 5.5 V | V |
| Data Transfer Rate | 30 MHz | MHz |
| Operating Temperature Range | -40°C to 85°C | °C |
| Package Type | HTSSOP (28 pins) | - |
Key Features
- 16 individually adjustable channels with 12-bit grayscale PWM control and 6-bit dot correction.
- Dot correction data stored in integrated EEPROM.
- Constant-current sink drive capability with adjustable current via an external resistor.
- LED open detection (LOD) and thermal error flag (TEF) for error monitoring.
- Serial data interface with CMOS level I/O and controlled in-rush current.
- Ability to chain multiple devices in series to control a larger number of LEDs.
- Cost and space-efficient design, eliminating the need for individual resistors for each LED.
Applications
- Monocolor, multicolor, and full-color LED displays.
- LED signboards and display backlighting.
- General high-current LED drive applications.
- RGB LED lighting projects and advanced electronics projects requiring precise light intensity control.
Q & A
- What is the TLC5940PWPRG4?
The TLC5940PWPRG4 is a 16-channel constant-current sink LED driver produced by Texas Instruments, designed for precise control over LED brightness using PWM and dot correction.
- How many channels does the TLC5940 have?
The TLC5940 has 16 individually adjustable channels.
- What is the resolution of the grayscale PWM control?
The grayscale PWM control has a 12-bit resolution, allowing for 4096 steps of brightness adjustment.
- What is dot correction and how is it implemented?
- What is the maximum current drive capability of the TLC5940?
The drive capability ranges from 0 mA to 60 mA (VCC < 3.6 V) and up to 120 mA (VCC > 3.6 V).
- What error detection mechanisms does the TLC5940 feature?
The TLC5940 features LED open detection (LOD) and thermal error flag (TEF).
- What is the data transfer rate of the TLC5940?
The data transfer rate is up to 30 MHz.
- What are some common applications of the TLC5940?
- How can multiple TLC5940 devices be used together?
- What precautions should be taken when using the TLC5940 with high-speed hardware?
