Overview
The TLC5947DAPR, manufactured by Texas Instruments, is a 24-channel, constant-current sink LED driver. This device is designed to provide precise control over LED brightness with 4096 pulse-width modulated (PWM) steps for each channel. The PWM control is repeated automatically with the programmed grayscale (GS) data, which is written via a serial interface port. The current value of all 24 channels is set by a single external resistor. The TLC5947DAPR features a thermal shutdown function that turns off all output drivers during over-temperature conditions and restarts them when the temperature returns to normal.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Number of Channels | 24 | - |
| PWM Steps | 4096 | - |
| Constant-Current Capability | 30 mA | mA |
| 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 |
| Package Type | HTSSOP (DAP) | - |
| Number of Pins | 32 | - |
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), 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 restart under normal temperature conditions
- 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 in the TLC5947DAPR? The TLC5947DAPR has 24 channels.
- What is the PWM resolution of the TLC5947DAPR? The TLC5947DAPR offers 4096 PWM steps.
- What is the maximum constant-current capability per channel? Each channel can handle up to 30 mA of constant current.
- 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 supported? The TLC5947DAPR supports LED power-supply voltages up to 30 V.
- Does the TLC5947DAPR have thermal protection? Yes, it features a thermal shutdown (TSD) function that turns off all output drivers during over-temperature conditions and restarts them when the temperature returns to normal.
- What is the data transfer rate in standalone operation? The data transfer rate in standalone operation is 30 MHz.
- How does the TLC5947DAPR prevent inrush current? It uses a 4-channel grouped delay to prevent inrush current.
- What is the operating temperature range of the TLC5947DAPR? The operating temperature range is from -40°C to 85°C.
- What type of package does the TLC5947DAPR come in? The TLC5947DAPR comes in a HTSSOP (DAP) package with 32 pins.
