TLC5945PWPR

Overview

The TLC5945PWPR is a 16-channel LED driver IC manufactured by Texas Instruments, housed in a 28-pin HTSSOP package. It operates within a supply voltage range of 3 V to 5.5 V and supports a maximum power supply current of 60 mA. The device provides independent 12-bit grayscale PWM control for each channel, allowing for precise brightness adjustment. It features an external reference resistor to set the output current, which can reach up to 120 mA per channel. The component includes built-in dot correction capabilities stored in EEPROM to ensure uniform LED intensity across all outputs.

Feature Summary

• Integrates 12-bit grayscale PWM control with 6-bit dot correction for high-fidelity LED dimming and color consistency.
• Includes internal error flag and fault detection mechanisms to monitor LED open and short circuit conditions.
• Supports daisy-chaining multiple devices via serial interface to expand the number of controllable channels without additional I/O pins.

Applications

• LED backlighting systems for displays
• General-purpose LED lighting control
• Dot matrix display drivers

Procurement Notes

Verify the specific suffix 'PWPR' confirms the HTSSOP-28 package and tape-and-reel packaging format. Ensure compatibility with the target operating temperature range of -40°C to +85°C. Confirm that the design accounts for the required external components, such as the GSCLK oscillator resistor and XLAT signal timing, as specified in the official datasheet.

Selection Notes

Select this component when 16 individually addressable channels with high-resolution grayscale control are required. It is suitable for applications needing precise current regulation and diagnostic feedback. Consider the thermal performance of the HTSSOP package if driving multiple channels at high currents simultaneously.

Part Context

This part belongs to the TLC594x family of LED drivers from Texas Instruments. It shares architectural similarities with the TLC5940 and TLC5944 but distinguishes itself through integrated EEPROM-based dot correction. This feature simplifies manufacturing calibration compared to variants requiring external memory or manual trimming.

Replacement Considerations

TLC5945PWP (Tube packaging variant)

FAQ

How is the output current for each LED channel determined?

The output current is set by an external reference resistor connected to the IREF pin, allowing customization based on the specific LED requirements.

What mechanism does the TLC5945PWPR use to detect faults?

It utilizes an internal error flag that indicates when an LED open or short circuit condition is detected on any of the output channels.