TLC5902

Overview

The TLC5902 is an 8-channel constant-current LED sink driver manufactured by Texas Instruments. It features individual 12-bit grayscale PWM control for each channel, enabling precise brightness adjustment and color mixing. The device supports a serial interface for data input and includes a dedicated output enable pin. It operates with a supply voltage range of 2.7V to 5.5V and provides adjustable current sinks up to 120mA per channel. The component is available in multiple package options including SSOP-24 and SOIC-24.

Feature Summary

• Provides independent 12-bit grayscale PWM dimming for eight channels
• Features a high-speed serial interface for data and clock signals
• Supports adjustable constant current sinks with external resistor setting
• Includes a global output enable function for synchronized control

Applications

• LED display panels requiring multi-level grayscale control
• Backlight systems for LCD modules
• General-purpose indicator lighting arrays
• Portable electronic devices with limited I/O pins

Procurement Notes

Verify the specific suffix code on the datasheet to confirm the exact package type and temperature rating. Ensure the selected variant matches the required PCB footprint dimensions. Confirm RoHS compliance status if restricted substances are mandated for the assembly process.

Selection Notes

Select this component when designing circuits that require precise per-channel brightness control without complex microcontroller processing. Consider the thermal dissipation capabilities of the chosen package if driving multiple channels at maximum current. Verify that the external current-setting resistor value aligns with the desired LED forward current specifications.

Part Context

This part belongs to the TLC590x family of LED drivers from Texas Instruments. It serves as a cost-effective solution for managing multiple LEDs in embedded systems. The series offers scalability through daisy-chaining capabilities, allowing designers to expand the number of controllable outputs beyond the native eight channels of a single unit.

Replacement Considerations

Check for direct equivalents within the same product family such as the TLC5901 or TLC5916. Verify pin compatibility and electrical characteristics before substituting. Ensure that any alternative component supports the same grayscale resolution and interface protocol.