TLC5946PW

Overview

The TLC5946PW is a linear LED driver IC featuring sixteen independent channels with 12-bit PWM dimming resolution. It incorporates six-bit dot correction for per-channel intensity adjustment, ensuring uniform brightness across outputs. The device operates on a single supply voltage ranging from 3V to 5.5V and supports an output voltage up to 17V. Each channel provides a constant current sink capability of 40mA. Communication is handled via a serial interface supporting clock frequencies up to 30MHz. The component is housed in a 28-TSSOP surface-mount package and functions within a temperature range of -40°C to +85°C.

Feature Summary

• Provides 12-bit pulse width modulation for precise grayscale control of connected LEDs.
• Includes integrated dot correction circuitry to compensate for manufacturing variations between individual channels.
• Features built-in fault detection mechanisms capable of identifying open or shorted LED conditions.

Applications

• LED backlighting systems
• Electronic signage displays

Procurement Notes

Verify the specific package variant required for the design, as the base model number may correspond to different tape-and-reel or tube packaging options depending on the suffix. Confirm that the component status aligns with long-term availability requirements, noting that certain variants may be discontinued while others remain active. Ensure that the thermal management strategy accounts for the power dissipation characteristics inherent to linear regulation at the intended operating currents.

Selection Notes

Choose this component when a high-resolution grayscale display is needed without external multiplexing complexity. The internal dot correction simplifies calibration processes compared to drivers lacking this feature. Consider the linear topology's impact on heat dissipation relative to switching alternatives. Verify that the serial interface timing constraints match the host microcontroller's capabilities for reliable data transmission at maximum clock speeds.

Part Context

This part belongs to the Texas Instruments TLC5946 family of LED drivers. The family shares core functionalities such as 12-bit PWM and dot correction but differs primarily in package type and packing method. Variants like the PWPR utilize tape-and-reel packaging for automated assembly, while the PWR offers a similar electrical profile in a standard reel format. The RHBT variant utilizes a VQFN package for compact board layouts.

Replacement Considerations

• TLC5946PWR
• TLC5946PWPR

FAQ

How does the dot correction feature function?

The TLC5946PW includes six-bit dot correction registers for each of the sixteen channels. This allows users to store unique scaling factors to equalize the perceived brightness of LEDs, compensating for inherent variations in LED efficiency.

What is the maximum output voltage supported?

The device supports an output voltage of up to 17V, allowing it to drive series strings of LEDs provided the total forward voltage does not exceed this limit.