Overview
The TLC5947DAPRG4, produced by Texas Instruments, is a 24-channel, constant-current sink LED driver. This device is designed to control LEDs with high precision and flexibility. Each of the 24 channels is individually adjustable with 4096 pulse-width modulated (PWM) steps, allowing for detailed grayscale control. The PWM control is repeated automatically with the programmed grayscale 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 operation of the device.
The TLC5947DAPRG4 features a thermal shutdown (TSD) function that turns off all output drivers during over-temperature conditions and automatically restarts when the temperature returns to normal. This ensures reliable and safe operation under various environmental conditions.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCC Supply Voltage | 3.0 | 5.5 | V | |
| LED Power-Supply Voltage | 30 | V | ||
| Output Current (dc) | 30 | mA | ||
| Constant-Current Accuracy (Channel-to-Channel) | ±2% | |||
| Constant-Current Accuracy (Device-to-Device) | ±2% | |||
| Data Transfer Rate (Standalone) | 30 | MHz | ||
| Data Transfer Rate (Cascaded Devices, SCLK Duty = 50%) | 15 | MHz | ||
| Internal Oscillator Frequency | 2.4 | 4 | 5.6 | MHz |
| Operating Temperature | -40 | 85 | °C |
Key Features
- 24 channels, 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 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 shutdown at over-temperature conditions and restart under normal temperature
- Noise reduction: 4-channel grouped delay to prevent inrush current
Applications
- Static LED displays
- Message boards
- Amusement illumination
- TV backlighting
Q & A
- What is the TLC5947DAPRG4?
The TLC5947DAPRG4 is a 24-channel, constant-current sink LED driver produced by Texas Instruments.
- How many PWM steps does the TLC5947DAPRG4 support per channel?
Each channel supports 4096 pulse-width modulated (PWM) steps.
- What is the maximum LED power-supply voltage for the TLC5947DAPRG4?
The maximum LED power-supply voltage is up to 30 V.
- What is the VCC range for the TLC5947DAPRG4?
The VCC range is from 3.0 V to 5.5 V.
- What is the data transfer rate for standalone operation?
The data transfer rate for standalone operation is 30 MHz.
- Does the TLC5947DAPRG4 have thermal protection?
Yes, it has a thermal shutdown (TSD) function that turns off all output drivers during over-temperature conditions and restarts when the temperature returns to normal.
- What is the operating temperature range for the TLC5947DAPRG4?
The operating temperature range is from -40°C to 85°C.
- How is the current value set for all 24 channels?
The current value of all 24 channels is set by a single external resistor.
- What is the purpose of the 4-channel grouped delay feature?
The 4-channel grouped delay feature is designed to prevent inrush current and reduce noise.
- What are some common applications of the TLC5947DAPRG4?
Common applications include static LED displays, message boards, amusement illumination, and TV backlighting.
