TLC5947DAP

Overview

The TLC5947DAP is a Texas Instruments LED lighting driver IC featuring 24 constant-current sink channels with 12-bit grayscale PWM dimming. It operates within a supply voltage range of 3 V to 5.5 V and supports output voltages up to 30 V. The device utilizes a shift register topology for data input and provides an internal GS clock. Designed for surface-mount applications, it is housed in a 32-HTSSOP package and functions reliably across an operating temperature range of -40°C to +85°C.

Feature Summary

• Integrates 24-channel constant-current sinks with 12-bit PWM resolution for precise LED brightness control
• Includes internal grayscale clock generation to simplify system timing requirements
• Features thermal shutdown protection to safeguard the component during high-temperature operation

Applications

• LED backlighting systems
• General LED illumination circuits
• Display driver modules

Procurement Notes

Verify the specific suffix DAP corresponds to the HTSSOP-32 package variant when sourcing. Confirm RoHS compliance status through official manufacturer documentation or authorized distributor datasheets prior to integration. Ensure design compatibility with the required 3 V to 5.5 V supply rails and 30 V output voltage limits for the target application environment.

Selection Notes

Select this component for designs requiring high channel density in a compact surface-mount footprint. The 24-channel configuration reduces external component count compared to single-channel drivers. Consider the HTSSOP-32 package constraints regarding thermal dissipation and PCB layout space. Verify that the 12-bit grayscale resolution meets the visual performance requirements of the intended display or lighting application.

Part Context

This part belongs to the TLC5947 family of LED drivers from Texas Instruments. The family shares core functionalities such as 12-bit PWM dimming and constant-current regulation. Variants within the series differ primarily by packaging options, such as the VQFN-32 used in the RHBT model versus the HTSSOP-32 used here. All variants maintain similar electrical characteristics regarding current sinking and voltage tolerance.

Replacement Considerations

The TLC5947RHBT serves as a pin-compatible alternative offering identical functionality in a VQFN-32 package. Designers must account for differences in thermal performance and physical dimensions when substituting between the HTSSOP and VQFN form factors.