Overview
The TLC5948A, produced by Texas Instruments, is a 16-channel constant-current sink LED driver. This device is designed to provide precise control over LED brightness with advanced features such as pulse width modulation (PWM) grayscale control, dot correction, and global brightness control. Each channel can be individually adjusted, and the device supports a wide range of operating conditions, making it suitable for various LED display applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Number of Channels | 16 | |
| Package Type | HTSSOP (PWP) | |
| Pins | 24 | |
| Operating Temperature Range | -40 to 85 | °C |
| VCC Supply Voltage | 3.0 to 5.5 | V |
| LED Power-Supply Voltage | Up to 10 | V |
| Sink Current Capability | 2 mA to 45 mA (VCC ≤ 3.6 V), 2 mA to 60 mA (VCC > 3.6 V) | mA |
| Dot Correction (DC) | 7-Bit (128 Steps) with 0% to 100% Range | |
| Global Brightness Control (BC) | 7-Bit (128 Steps) with 25% to 100% Range | |
| Grayscale Control (GS) | 16-Bit (65,536 Steps) | |
| Data Transfer Rate | 33 MHz | |
| Grayscale Control Clock | 33 MHz | |
| Constant-Current Accuracy | Channel-to-Channel: ±0.6% (typ), ±2% (max); Device-to-Device: ±1% (typ), ±4% (max) | % |
Key Features
- 16 constant-current sink output channels with individually adjustable PWM grayscale brightness control.
- 7-bit dot correction (DC) and 7-bit global brightness control (BC).
- 16-bit grayscale control with 65,536 steps.
- Power-save mode to minimize VCC current.
- Error detection features including LED open detection (LOD), LED short detection (LSD), output leakage detection (OLD), reference current terminal short flag detection (ISF), pre-thermal warning (PTW), and thermal error flag (TEF).
- Four-channel grouped delay switching to prevent inrush current.
- Auto display repeat and auto data refresh, along with display timing reset.
- Invisible detection mode (IDM) for LOD and LSD.
- Thermal shutdown (TSD) and error flag (TEF) for thermal protection.
Applications
- LED video displays.
- LED signboards.
- Large display systems requiring precise LED control.
Q & A
- What is the TLC5948A?
The TLC5948A is a 16-channel constant-current sink LED driver produced by Texas Instruments.
- How many channels does the TLC5948A have?
The TLC5948A has 16 channels.
- What is the operating temperature range of the TLC5948A?
The operating temperature range is -40°C to 85°C.
- What is the maximum LED power-supply voltage supported by the TLC5948A?
The maximum LED power-supply voltage is up to 10 V.
- What are the error detection features of the TLC5948A?
The device includes LED open detection (LOD), LED short detection (LSD), output leakage detection (OLD), reference current terminal short flag detection (ISF), pre-thermal warning (PTW), and thermal error flag (TEF).
- How does the TLC5948A manage thermal issues?
The device features thermal shutdown (TSD), pre-thermal warning (PTW), and thermal error flag (TEF) for thermal protection.
- What is the data transfer rate of the TLC5948A?
The data transfer rate is 33 MHz.
- What is the grayscale control resolution of the TLC5948A?
The grayscale control resolution is 16-bit with 65,536 steps.
- Does the TLC5948A support power-saving features?
Yes, it has a power-save mode to minimize VCC current.
- What are some typical applications of the TLC5948A?
Typical applications include LED video displays, LED signboards, and large display systems.
