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Texas Instruments TLC5924RHBT
- Part No.:
- TLC5924RHBT
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
TLC5924RHBT.pdf
- Description:
- IC LED DRIVER LINEAR 80MA 32VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:352
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Product details
Overview
TLC5924RHBT from Texas Instruments is a 16-channel constant-current LED sink driver with integrated dot correction (7-bit per channel), pre-charge FETs, LED open detection (LOD), and thermal error flag (TEF). It operates from 3.0 V to 5.5 V supply, supports up to 80 mA per channel, and delivers 10 ns typical output rise/fall times for high-speed dynamic LED displays. It is used in monocolor/multicolor LED signboards and display backlighting.
For engineers reviewing the TLC5924RHBT datasheet, TLC5924RHBT pinout, TLC5924RHBT application, or TLC5924RHBT equivalent, key selection criteria include its 112-bit dot-correction serial interface, BLANK-controlled pre-charge timing, LOD/TEF error reporting via open-drain XERR, and QFN-32 (RHB) package thermal performance.
Technical Context
The TLC5924RHBT implements dual-mode serial control via MODE pin: low for 16-bit ON/OFF register latching on XLAT rising edge, high for 112-bit dot-correction data loading under XLAT high-level enable. Its internal architecture includes cascaded 16-bit shift registers, parallel 7-bit DC registers, and 16 independent constant-current sinks each with dedicated pre-charge FETs tied to VUP.
LED open detection triggers when BLANK = L, ON/OFF = H, and OUTn voltage < 0.3 V (typical); thermal error activates at junction temperature ≥160 °C (typical). Output delay between channels is fixed at 20 ns (typical), reducing inrush current during simultaneous turn-on.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 16 independent constant-current sink outputs |
| Max sink current | 80 mA per channel, set by external IREF resistor |
| Dot correction | 7-bit (128 steps) per channel, programmed in single 112-bit packet |
| Pre-charge FET | Enables improved image quality in dynamic-drive LED displays |
| LOD/TEF reporting | Open-drain XERR pin signals LED open or thermal fault conditions |
| Serial interface | 30 MHz max SCLK; SIN/SOUT/SCLK/MODE/XLAT/BLANK control |
| Supply range | VCC = 3.0 V to 5.5 V; VUP = 3 V to 15 V |
| Operating temp | –40 °C to +85 °C ambient free-air temperature |
Pinout & Package
Package: 32-pin VQFN (RHB), 5 mm × 5 mm, exposed thermal pad (PowerPAD™), moisture sensitivity level 2 (260 °C, 1 year).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BLANK | Global output enable/disable | High forces all OUTn to VUP (off); low enables current sink per ON/OFF or DC register |
| XLAT | Data latch control | Rising edge latches ON/OFF data; high level enables DC data write |
| MODE | Interface mode select | Low configures 16-bit ON/OFF mode; high configures 112-bit dot-correction mode |
| SIN / SOUT | Serial data I/O | SIN receives shift data; SOUT outputs LOD status or cascades to next device |
| IREF | Current reference input | External resistor to GND sets max channel current (IMAX = 40 × VIREF/RIREF) |
| XERR | Error flag output | Open-drain; pulled low on LOD or TEF detection; supports wired-OR across multiple ICs |
| VUP | Pre-charge power supply | Two pins (2, 23) must be connected to same 3–15 V rail for pre-charge FET operation |
| PGND | Power ground | Four pins (9, 14, 19, 24) provide low-inductance return path for output currents |
Key Features
| Feature | Design Value |
|---|---|
| Channel-to-channel current accuracy | ±1% typical matching enables uniform LED brightness without external trimming |
| Output switching speed | Tr/Tf = 10 ns typical ensures minimal ghosting in high-refresh-rate LED panels |
| Controlled in-rush current | 20 ns inter-channel delay reduces peak supply current and eases bypass capacitor sizing |
| Integrated diagnostics | LOD detects open LEDs per channel; TEF monitors die temperature - both reported via XERR |
| Flexible serial cascade | SOUT-to-SIN daisy-chaining supports large LED arrays with single controller interface |
Applications
| Monocolor LED Signboard | Multicolor LED Display |
|---|---|
Use Scenario: Outdoor alphanumeric signage using discrete red/green/blue LED modules driven in static or multiplexed scan. IC Role / Device Role / Timing Role: Constant-current sink driver with per-channel dot correction compensates for LED binning and aging drift. Use Value: Enables consistent luminance across 16×N LED rows without manual calibration; LOD flag alerts maintenance before full segment failure. | Use Scenario: Indoor full-color video wall with 16-output LED modules arranged in RGB pixel clusters. IC Role / Device Role / Timing Role: Simultaneous 112-bit dot-correction update synchronizes brightness scaling across all R/G/B subpixels per module. Use Value: Eliminates color shift during grayscale transitions; pre-charge FETs suppress flicker during rapid BLANK toggling. |
| Display Backlighting | Multicolor LED Lighting |
Use Scenario: Edge-lit LCD backlight using white LEDs with local dimming zones controlled by TLC5924RHBT banks. IC Role / Device Role / Timing Role: High-accuracy current sink maintains consistent luminance across zones despite Vf variation and temperature drift. Use Value: Achieves >1000:1 dimming ratio using BLANK-pulsed PWM combined with 7-bit DC adjustment; TEF prevents thermal runaway in sealed enclosures. | Use Scenario: Architectural accent lighting with programmable RGBW LED strips segmented into 16-channel groups. IC Role / Device Role / Timing Role: Serial interface allows microcontroller to update ON/OFF state and dot correction per group over shared bus. Use Value: Reduces wiring complexity vs. individual current sources; LOD detection identifies failed LED strings before visible dark spots appear. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC5924RHB | Same silicon, active production version; TLC5924RHBT is obsolete (TI Package Addendum) | No functional difference; identical pinout, specs, and thermal performance | Select TLC5924RHB for new designs requiring long-term supply assurance |
| MAX7219CWG+ | 8-channel, SPI interface only; no pre-charge FET or LOD; ±15% current accuracy | Targeted at 7-segment/matrix displays, not high-fidelity LED panels | Choose only if lower channel count and reduced diagnostics are acceptable |
Compared with TLC5924RHB, the TLC5924RHBT shares identical electrical behavior but lacks ongoing production support; versus MAX7219CWG+, it offers double the channels, tighter current matching, integrated diagnostics, and pre-charge capability essential for flicker-free video-grade LED systems.
Availability
TLC5924RHBT is available at Aetrix Electronics and suitable for LED signboard manufacturing, display backlighting design, and multicolor architectural lighting requiring stable component supply despite its obsolete status.
Supply support for TLC5924RHBT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and consumer markets.
The TLC5924 product line was designed specifically for high-reliability, high-brightness LED display systems requiring per-channel brightness correction, real-time fault monitoring, and robust thermal management in space-constrained packages.
FAQ
What is the function of the MODE pin on the TLC5924RHBT?
The MODE pin selects the serial interface operating mode: logic low configures the TLC5924RHBT for 16-bit ON/OFF data input (latched on XLAT rising edge), while logic high enables 112-bit dot-correction data loading (written while XLAT is high). This dual-mode architecture allows separate control of LED on/off states and fine brightness tuning without reconfiguring hardware connections.
How does the TLC5924RHBT implement LED open detection (LOD)?
The TLC5924RHBT detects an open LED when three conditions occur simultaneously: BLANK = low, the corresponding ON/OFF bit = high, and the output voltage (OUTn) falls below 0.3 V (typical). Detected LOD status per channel is stored in an internal latch and can be read serially via SOUT after proper XLAT and SCLK sequencing - enabling system-level fault isolation without additional sensing circuitry.
Can the TLC5924RHBT drive LEDs with supply voltages above 5.5 V?
Yes - the TLC5924RHBT supports LED anode supplies up to 17 V via the VUP pins (pins 2 and 23), while its logic supply (VCC) remains within 3.0 V to 5.5 V. This separation allows driving high-Vf LEDs (e.g., blue/white) from a higher rail while interfacing safely with 3.3 V or 5 V microcontrollers, provided VUP and PGND are properly decoupled and routed.
What is the purpose of the pre-charge FET in the TLC5924RHBT?
The pre-charge FET in the TLC5924RHBT rapidly pulls the LED cathode node to VUP during BLANK = high, discharging parasitic capacitance before the next current-sink turn-on cycle. This minimizes turn-on delay and eliminates visual artifacts like ghosting or trailing in high-refresh-rate dynamic LED displays - a critical feature for video-grade applications where the TLC5924RHBT is commonly deployed.
Is the TLC5924RHBT pin-compatible with other TI LED drivers like the TLC5940?
No - the TLC5924RHBT is not pin-compatible with the TLC5940 series. It uses a distinct 32-pin QFN (RHB) layout with dedicated VUP, PGND, and XERR pins not present in TLC5940's 28-pin TSSOP package. Signal mapping differs significantly: TLC5924RHBT employs MODE-selectable serial modes and BLANK-gated pre-charge, whereas TLC5940 uses grayscale clocking and dot-correction latched differently. PCB redesign is required for substitution.
TLC5924RHBT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 32-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Last Time Buy
- Type:
- Linear
- Topology:
- Shift Register
- Internal Switch(s):
- Yes
- Number of Outputs:
- 16
- Voltage - Supply (Min):
- 3V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 15V
- Current - Output / Channel:
- 80mA
- Frequency:
- 30MHz
- Dimming:
- -
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-VQFN (5x5)
TLC5924RHBT FAQ
1.How can I place an order for TLC5924RHBT through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC5924RHBT on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for TLC5924RHBT reliable?
The price and inventory of TLC5924RHBT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC5924RHBT is usually 5 days.
3.What payment methods are accepted for TLC5924RHBT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC5924RHBT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC5924RHBT?
TLC5924RHBT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC5924RHBT order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for TLC5924RHBT?
For technical support, including TLC5924RHBT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC5924RHBT requirements.
6.How does Aetrix verify that TLC5924RHBT is sourced from the original manufacturer or authorized distributors?
All TLC5924RHBT products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TLC5924RHBT meets industry standards.
7.What is the process for return or replacement of TLC5924RHBT?
All TLC5924RHBT units undergo pre-shipment inspection (PSI). If there is an issue with TLC5924RHBT, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The TLC5924RHBT part is unused and in its original packaging.
Return procedure for TLC5924RHBT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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