Overview
The TLC5947RHBR is a 24-channel, constant-current sink LED driver produced by Texas Instruments. This device is designed to control LED displays with high precision and efficiency. Each of the 24 channels is individually adjustable with 4096 pulse-width modulated (PWM) steps, allowing for detailed grayscale control. The TLC5947RHBR features an internal oscillator and operates within a supply voltage range of 3.0 V to 5.5 V, making it versatile for various applications. The device includes thermal shutdown and noise reduction features to ensure reliable operation.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Number of Channels | 24 | - |
| Constant-Current Sink Capability | 30 mA | mA |
| PWM Grayscale Control | 12-bit (4096 steps) | - |
| LED Power-Supply Voltage | Up to 30 V | V |
| VCC Supply Voltage | 3.0 V to 5.5 V | V |
| Constant-Current Accuracy (Channel-to-Channel) | ±2% (Typical) | % |
| Constant-Current Accuracy (Device-to-Device) | ±2% (Typical) | % |
| Data Transfer Rate (Standalone) | 30 MHz | MHz |
| Data Transfer Rate (Cascaded Devices, SCLK Duty = 50%) | 15 MHz | MHz |
| Internal Oscillator Frequency | 4 MHz | MHz |
| Operating Temperature Range | -40°C to 85°C | °C |
Key Features
- 24 channels with constant-current sink output
- 30-mA capability per channel
- 12-bit (4096 steps) PWM grayscale control
- LED power-supply voltage up to 30 V
- VCC supply voltage range: 3.0 V to 5.5 V
- CMOS logic level I/O
- 30-MHz data transfer rate (standalone) and 15-MHz data transfer rate (cascaded devices, SCLK duty = 50%)
- Shift out data changes with falling edge to avoid data shift errors
- Auto display repeat
- 4-MHz internal oscillator
- Thermal shutdown (TSD) with automatic shutdown at over-temperature conditions and restart under normal temperature
- Noise reduction with 4-channel grouped delay to prevent inrush current
Applications
- Static LED displays
- Message boards
- Amusement illumination
- TV backlighting
Q & A
- What is the number of channels supported by the TLC5947RHBR?
The TLC5947RHBR supports 24 channels.
- What is the maximum constant-current sink capability per channel?
The maximum constant-current sink capability per channel is 30 mA.
- What is the resolution of the PWM grayscale control?
The PWM grayscale control has a resolution of 12 bits (4096 steps).
- What is the range of the VCC supply voltage?
The VCC supply voltage range is from 3.0 V to 5.5 V.
- What is the maximum LED power-supply voltage?
The maximum LED power-supply voltage is up to 30 V.
- Does the TLC5947RHBR have thermal shutdown protection?
Yes, the TLC5947RHBR has thermal shutdown (TSD) protection that turns off all output drivers during over-temperature conditions and restarts them when the temperature returns to normal.
- What is the frequency of the internal oscillator?
The internal oscillator frequency is 4 MHz.
- What is the operating temperature range of the TLC5947RHBR?
The operating temperature range is from -40°C to 85°C.
- How does the TLC5947RHBR prevent data shift errors?
The TLC5947RHBR prevents data shift errors by shifting out data changes with the falling edge of the SCLK.
- What are some common applications of the TLC5947RHBR?
Common applications include static LED displays, message boards, amusement illumination, and TV backlighting.
