Overview
The TLC5947DAPG4 is a 24-channel, constant-current sink LED driver produced by Texas Instruments. This device is designed to control LED brightness with high precision, offering 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 TLC5947DAPG4 features a thermal shutdown (TSD) function that turns off all output drivers during over-temperature conditions and automatically restarts them when the temperature returns to normal.
Key Specifications
| Parameter | Value |
|---|---|
| Number of Channels | 24 |
| Output Type | Constant-Current Sink |
| Output Current per Channel | 30 mA |
| PWM Steps | 4096 |
| LED Power-Supply Voltage | Up to 30 V |
| VCC 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 | 32-HTSSOP (0.240", 6.10mm Width) Exposed Pad |
Key Features
- 24 channels with individually adjustable constant-current sink outputs
- 12-bit (4096 steps) PWM grayscale control for precise brightness adjustment
- LED power-supply voltage up to 30 V
- VCC range of 3.0 V to 5.5 V
- CMOS logic level I/O
- High data transfer rates: 30 MHz (standalone) and 15 MHz (cascaded devices)
- 4-MHz internal oscillator for operation without external clock signals
- Thermal shutdown (TSD) function for over-temperature protection
- Noise reduction with 4-channel grouped delay to prevent inrush current
- Auto display repeat function for continuous display without timing control signals
Applications
The TLC5947DAPG4 is primarily used in backlighting applications, such as in LCD displays, signage, and other LED lighting systems that require precise and adjustable brightness control. Its high current capability and thermal protection features make it suitable for a variety of demanding LED driver applications.
Q & A
- What is the number of channels in the TLC5947DAPG4?
The TLC5947DAPG4 has 24 channels.
- What is the output current capability per channel?
Each channel can sink up to 30 mA of current.
- How many PWM steps are available for each channel?
Each channel has 4096 PWM 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 thermal shutdown (TSD) function?
The TSD function turns off all output drivers during over-temperature conditions and restarts them when the temperature returns to normal.
- What is the data transfer rate of the TLC5947DAPG4?
The data transfer rate is 30 MHz (standalone) and 15 MHz (cascaded devices, SCLK Duty = 50%).
- Does the TLC5947DAPG4 have an internal oscillator?
Yes, it has a 4-MHz internal oscillator.
- What is the operating temperature range of the TLC5947DAPG4?
The operating temperature range is -40°C to 85°C.
- What type of package does the TLC5947DAPG4 come in?
The TLC5947DAPG4 comes in a 32-HTSSOP (0.240", 6.10mm Width) Exposed Pad package.
- What is the purpose of the auto display repeat function?
The auto display repeat function allows the device to repeat the total display period without any timing control signals.
