Overview
The TLC5947DAP, produced by Texas Instruments, is a 24-channel, constant-current sink LED driver. This device is designed to control LED displays with high precision and reliability. Each of the 24 channels is individually adjustable with 4096 pulse-width modulated (PWM) steps, allowing for fine-grained control over the brightness of the LEDs. 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, simplifying the setup and configuration process.
Key Specifications
| Specification | Value |
|---|---|
| Number of Channels | 24 |
| Current Capability per Channel | 30 mA (Constant-Current Sink) |
| PWM Grayscale Control | 12-Bit (4096 Steps) |
| LED Power-Supply Voltage | Up to 30 V |
| VCC Voltage Range | 3.0 V to 5.5 V |
| Constant-Current Accuracy | Channel-to-Channel: ±2% (Typical), Device-to-Device: ±2% (Typical) |
| Data Transfer Rate | 30 MHz (Standalone), 15 MHz (Cascaded Devices, SCLK Duty = 50%) |
| Internal Oscillator Frequency | 4 MHz |
| Operating Temperature Range | -40°C to 85°C |
| Package Type | HTSSOP-32 |
Key Features
- 24 channels with constant-current sink output
- 30-mA capability per channel
- 12-bit PWM grayscale control with 4096 steps
- LED power-supply voltage up to 30 V
- VCC voltage range from 3.0 V to 5.5 V
- CMOS logic level I/O
- High data transfer rates: 30 MHz (standalone) and 15 MHz (cascaded devices)
- 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
- Other applications requiring precise LED control
Q & A
- What is the TLC5947DAP used for?
The TLC5947DAP is a 24-channel, constant-current sink LED driver used for controlling LED displays with high precision.
- How many PWM steps does the TLC5947DAP support?
The TLC5947DAP supports 4096 PWM steps for each channel.
- What is the maximum LED power-supply voltage for the TLC5947DAP?
The maximum LED power-supply voltage is up to 30 V.
- What is the operating temperature range of the TLC5947DAP?
The operating temperature range is from -40°C to 85°C.
- Does the TLC5947DAP have thermal protection?
- How is the current value set for the channels?
The current value of all 24 channels is set by a single external resistor.
- What is the data transfer rate of the TLC5947DAP?
The data transfer rate is 30 MHz for standalone operation and 15 MHz for cascaded devices with a 50% SCLK duty cycle.
- Does the TLC5947DAP have an internal oscillator?
- What package type is the TLC5947DAP available in?
The TLC5947DAP is available in an HTSSOP-32 package.
- What are some common applications of the TLC5947DAP?
