Overview
The TLC5955DCAR is a 48-channel, constant-current sink driver produced by Texas Instruments. This device is designed to control LED brightness with high precision and flexibility. Each channel features individually-adjustable pulse width modulation (PWM) and grayscale (GS) brightness control with 65,536 steps, as well as 128 steps of constant-current dot correction (DC). The device also includes global brightness control (BC) with 128 steps and maximum current control (MC) with an 8-step range. It is packaged in a 56-pin HTSSOP (DCA) package and operates over a temperature range of –40°C to +85°C.
Key Specifications
| Specification | Value |
|---|---|
| Number of Channels | 48 |
| Package Type | HTSSOP (DCA) |
| Pins | 56 |
| Operating Temperature Range | –40°C to +85°C |
| Grayscale (GS) Control | 16-Bit (65,536 Steps) |
| Dot Correction (DC) Control | 7 Bits (128 Steps), 26.2% to 100% Range |
| Global Brightness Control (BC) | 7 Bits (128 Steps), 10% to 100% Range |
| Maximum Current (MC) Control | 3 Bits (8 Steps), 3-mA to 30-mA Range |
| LED Power-Supply Voltage | Up to 10 V |
| VCC | 3.0 V to 5.5 V |
| Constant-Current Accuracy | Channel-to-Channel: ±2% (typ), ±5% (max); Device-to-Device: ±2% (typ), ±4% (max) |
| Data Transfer Rate | 25 MHz |
| Grayscale Control Clock | 33 MHz |
Key Features
- 48 constant-current sink output channels
- Individually-adjustable PWM and grayscale brightness control with 65,536 steps
- Dot correction (DC) control with 128 steps and a 26.2% to 100% range
- Global brightness control (BC) with 128 steps and a 10% to 100% range
- Maximum current control (MC) with 8 steps and a 3-mA to 30-mA range
- LED open detection (LOD) and LED short detection (LSD)
- Auto display repeat, display timing reset, and auto data refresh for GS and DC
- UVLO sets default data and delay switching to prevent inrush current
- Data transfer rate of 25 MHz and grayscale control clock of 33 MHz
Applications
- LED video displays
- Variable message signs (VMS)
- Illumination systems
Q & A
- What is the TLC5955DCAR? The TLC5955DCAR is a 48-channel, constant-current sink driver produced by Texas Instruments.
- How many channels does the TLC5955DCAR have? The TLC5955DCAR has 48 constant-current sink output channels.
- What is the operating temperature range of the TLC5955DCAR? The operating temperature range is –40°C to +85°C.
- What is the resolution of the grayscale (GS) control? The grayscale control has a resolution of 16 bits, providing 65,536 steps.
- Does the TLC5955DCAR have error detection features? Yes, it includes LED open detection (LOD) and LED short detection (LSD).
- What is the maximum LED power-supply voltage supported by the TLC5955DCAR? The maximum LED power-supply voltage is up to 10 V.
- What is the data transfer rate of the TLC5955DCAR? The data transfer rate is 25 MHz.
- Does the TLC5955DCAR support auto display repeat and auto data refresh? Yes, it supports auto display repeat, display timing reset, and auto data refresh for GS and DC.
- How many steps are available for global brightness control (BC)? The global brightness control has 128 steps with a 10% to 100% range.
- What is the range of the maximum current control (MC)? The maximum current control has an 8-step range from 3 mA to 30 mA.
