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Texas Instruments TLC5923RHBT
- Part No.:
- TLC5923RHBT
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
TLC5923RHBT.pdf
- Description:
- IC LED DRIVER LINEAR 80MA 32VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,415
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Product details
Overview
TLC5923RHBT from Texas Instruments is a 16-channel constant-current LED sink driver with per-channel 7-bit dot correction (128-step brightness adjustment), ±1% typical current accuracy, and integrated 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 targets high-reliability LED display backlighting and signage applications.
For engineers reviewing the TLC5923RHBT datasheet, TLC5923RHBT pinout, TLC5923RHBT application, or TLC5923RHBT equivalent, key selection criteria include its 32-pin QFN (RHB) package, 30 MHz serial interface, BLANK-controlled global output disable, MODE-selectable ON/OFF vs. dot-correction data mode, and open-drain XERR fault reporting.
Technical Context
The TLC5923RHBT implements dual-mode serial control: MODE = L configures 16-bit ON/OFF shift register latched on XLAT rising edge; MODE = H enables 112-bit dot-correction register latched on XLAT high level. Each channel's output current is set by external IREF resistor and scaled 40×, with independent 7-bit DC weighting applied pre-sink.
It integrates graduated 20 ns inter-channel delay (OUT0–OUT15) to suppress inrush current, supports cascading via SOUT→SIN, and reports faults via open-drain XERR-asserted low on LOD (VOUTn < 0.3 V while ON) or TEF (junction >160°C). PGND pins are distributed across 6 locations for thermal and EMI performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output channels | 16 independent constant-current sinks, each programmable 0–80 mA |
| Dot correction resolution | 7-bit (128 steps) per channel, enabling precise LED brightness matching |
| Current accuracy | ±1% typical channel-to-channel matching, critical for uniform display luminance |
| Serial interface speed | 30 MHz max SCLK, supporting fast frame updates in dynamic LED displays |
| Supply voltage range | 3.0 V to 5.5 V VCC, compatible with standard logic-level microcontrollers |
| LED voltage capability | Up to 17 V at OUTn pins, enabling direct drive of multi-LED strings |
| Thermal shutdown threshold | 160°C typical junction temperature (TEF activation), protecting against thermal runaway |
| LED open detection | Detects open-circuit LEDs at VOUTn < 0.3 V while channel is enabled |
Pinout & Package
Package: 32-pin QFN (5 mm × 5 mm), RHB suffix, exposed thermal pad (PowerPAD™) soldered to PCB ground plane for enhanced thermal dissipation (27.86 mW/°C derating above 25°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SIN) | Serial data input | Accepts MSB-first 16-bit ON/OFF or 112-bit dot-correction data based on MODE state |
| 2 (MODE) | Function mode select | LOW = ON/OFF register mode (16-bit shift); HIGH = dot-correction mode (112-bit shift) |
| 3 (XLAT) | Data latch control | Rising edge latches ON/OFF data; HIGH level latches dot-correction data |
| 4 (SCLK) | Serial clock input | Drives internal shift register on rising edge; supports up to 30 MHz operation |
| 5 (BLANK) | Global output disable | HIGH forces all 16 outputs OFF regardless of register state; used for PWM dimming |
| 6–21, 23–24, 27 (OUT0–OUT15, PGND) | Current sink outputs / power ground | 16 dedicated sink terminals + 6 distributed PGND pins reduce ground bounce and improve thermal path |
| 22 (XERR) | Open-drain fault output | LOW indicates LOD or TEF event; multiple devices can be wire-OR'd with single pull-up |
| 25 (IREF) | Reference current setting | Connect external resistor to GND; sets max channel current as IOUT = 40 × (1.24 V / RIREF) |
| 26 (VCC) | Logic supply | 3.0–5.5 V digital core supply; decoupling required near pin |
| 28–29 (GND, SOUT) | Ground / serial data output | SOUT outputs shifted LOD status or cascaded data; GND provides reference for IREF and logic |
Key Features
| Feature | Design Value |
|---|---|
| Per-channel dot correction | 7-bit (128-step) independent brightness scaling eliminates LED binning variance in displays |
| Integrated fault detection | Hardware LOD (open LED) and TEF (overtemperature) reporting via single XERR pin reduces system monitoring overhead |
| Controlled in-rush current | 20 ns inter-channel output delay (OUT0–OUT15) limits peak supply current during turn-on sequences |
| Cascadable serial interface | SOUT-to-SIN daisy-chaining enables scalable LED channel expansion without additional controller pins |
| Thermally optimized package | QFN RHB with exposed PowerPAD™ delivers 3482 mW max power dissipation at 25°C for high-brightness operation |
| Robust operating range | –40°C to +85°C ambient rating and 17 V output voltage headroom support industrial outdoor signage |
Applications
| Monocolor LED Signboard | Multicolor LED Display |
|---|---|
|
Use Scenario: Outdoor alphanumeric message boards using discrete red/green/blue LED modules. IC Role / Device Role / Timing Role: TLC5923RHBT drives each color channel independently with synchronized BLANK-based PWM dimming and per-pixel dot correction. Use Value: Enables consistent color balance and brightness uniformity across large panels despite LED manufacturing variations and temperature drift. |
Use Scenario: Indoor full-color video walls with high-density SMD LED cabinets. IC Role / Device Role / Timing Role: TLC5923RHBT serves as column driver in multiplexed architecture, accepting serialized pixel data via cascaded SOUT/SIN links. Use Value: 30 MHz interface and 16-channel integration reduce controller I/O count and PCB routing complexity versus discrete drivers. |
| Display Backlighting | Multicolor LED Lighting |
|
Use Scenario: Edge-lit LCD backlights for industrial HMIs requiring local dimming zones. IC Role / Device Role / Timing Role: TLC5923RHBT controls individual LED strings in segmented zones, with BLANK modulated for dynamic contrast enhancement. Use Value: ±1% current matching ensures uniform luminance across zones; LOD detection prevents hot-spot failure modes. |
Use Scenario: Architectural accent lighting with RGBW LED strips controlled for hue/saturation tuning. IC Role / Device Role / Timing Role: TLC5923RHBT sinks current for each primary color channel, with dot correction calibrated per installation for white-point consistency. Use Value: Hardware-based 7-bit per-channel correction eliminates software gamma lookup tables and real-time processing load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC5940RHBR | 16-channel, 12-bit PWM + 6-bit dot correction; requires external RC for grayscale clock; no LOD/TEF | Better grayscale depth (4096 steps) but lacks hardware fault detection and simpler thermal management | Select when fine-grained PWM dimming outweighs fault reporting needs and board space allows RC network |
| IS31FL3728-QFLS4-TR | 18-channel, I²C interface, integrated auto-breathing, 8-bit current control, no dot correction | Lower pin count and firmware simplicity vs. serial protocol handling; no per-channel brightness calibration | Select for cost-sensitive consumer lighting where uniformity requirements are less stringent than signage |
Compared with TLC5923RHBT, TLC5940RHBR offers higher PWM resolution but adds external timing components and omits fault flags, while IS31FL3728-QFLS4-TR simplifies system integration via I²C yet sacrifices per-channel dot correction essential for professional displays.
Availability
TLC5923RHBT is available at Aetrix Electronics and suitable for monocolor LED signboards, multicolor display modules, and display backlighting requiring stable component supply, long-term industrial availability, and guaranteed traceable sourcing.
Supply support for TLC5923RHBT 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 leader specializing in analog, embedded processing, and connectivity technologies, with decades of experience in precision power and signal-chain solutions.
The TLC5923RHBT belongs to TI's high-accuracy LED driver product line, engineered specifically for industrial and commercial signage applications demanding brightness uniformity, fault resilience, and thermal robustness.
FAQ
What is the maximum output current per channel for the TLC5923RHBT?
The TLC5923RHBT supports up to 80 mA per channel (IOLC), set by an external resistor on the IREF pin. Using the formula IOUT = 40 × (1.24 V / RIREF), a 600 Ω resistor yields the full 80 mA. The device guarantees ±1% typical current matching across all 16 channels, making TLC5923RHBT suitable for high-uniformity LED arrays.
How does the TLC5923RHBT implement dot correction, and what is its resolution?
The TLC5923RHBT provides 7-bit (128-step) per-channel dot correction, allowing independent brightness scaling from 0% to 100% of the maximum current. Dot-correction data is loaded as a 112-bit serial packet (16 × 7 bits) when MODE = H and latched on XLAT high level. This feature directly compensates for LED forward-voltage variation and aging effects, a core capability of the TLC5923RHBT.
Can multiple TLC5923RHBT devices be cascaded, and how is data routed?
Yes, TLC5923RHBT devices support daisy-chain configuration: the SOUT pin of one device connects to the SIN pin of the next. Serial data propagates through the chain under shared SCLK and MODE control, with XLAT synchronizing latch events across all devices. Cascading preserves the 30 MHz interface speed and enables scalable channel counts without additional controller I/O, a key architectural advantage of the TLC5923RHBT.
What fault conditions does the TLC5923RHBT detect, and how are they reported?
The TLC5923RHBT detects LED open-circuit (LOD) and overtemperature (TEF) faults, both signaled via the open-drain XERR pin. LOD triggers when an enabled output exhibits VOUTn < 0.3 V; TEF activates at ~160°C junction temperature. XERR pulls low on either condition and supports wired-OR connection of multiple TLC5923RHBT devices for consolidated system-level fault monitoring.
What is the function of the BLANK pin on the TLC5923RHBT, and how is it used in PWM dimming?
The BLANK pin on the TLC5923RHBT provides global output disable: when driven HIGH, all 16 channels are forced OFF regardless of their ON/OFF register state. This enables precise, jitter-free PWM dimming by externally toggling BLANK at the desired frequency and duty cycle. Unlike software-based dimming, BLANK acts at the output stage, ensuring zero latency and full channel synchronization-critical for flicker-free operation in the TLC5923RHBT.
TLC5923RHBT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 32-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Linear
- Topology:
- Shift Register
- Internal Switch(s):
- Yes
- Number of Outputs:
- 16
- Voltage - Supply (Min):
- 3V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 17V
- 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)
TLC5923RHBT FAQ
1.How can I place an order for TLC5923RHBT through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC5923RHBT 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 TLC5923RHBT reliable?
The price and inventory of TLC5923RHBT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC5923RHBT is usually 5 days.
3.What payment methods are accepted for TLC5923RHBT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC5923RHBT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC5923RHBT?
TLC5923RHBT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC5923RHBT 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 TLC5923RHBT?
For technical support, including TLC5923RHBT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC5923RHBT requirements.
6.How does Aetrix verify that TLC5923RHBT is sourced from the original manufacturer or authorized distributors?
All TLC5923RHBT 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 TLC5923RHBT meets industry standards.
7.What is the process for return or replacement of TLC5923RHBT?
All TLC5923RHBT units undergo pre-shipment inspection (PSI). If there is an issue with TLC5923RHBT, 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 TLC5923RHBT part is unused and in its original packaging.
Return procedure for TLC5923RHBT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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