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Texas Instruments TLC5923RHBTG4
- Part No.:
- TLC5923RHBTG4
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
TLC5923RHBTG4.pdf
- Description:
- IC LED DRIVER LINEAR 80MA 32VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:250
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Product details
Overview
TLC5923RHBTG4 from Texas Instruments is a 16-channel constant-current LED sink driver with 7-bit dot correction (128-step brightness adjustment per channel), ±1% typical current accuracy, and 30 MHz serial interface clock support. It operates from 3.0 V to 5.5 V supply and supports up to 17 V LED forward voltage, enabling use in full-color LED displays and signage requiring precise per-channel intensity control.
For engineers reviewing the TLC5923RHBTG4 datasheet, TLC5923RHBTG4 pinout, TLC5923RHBTG4 application, or TLC5923RHBTG4 equivalent, key selection criteria include its 16-channel independent dot correction, thermal/LED-open error reporting via open-drain XERR, BLANK-controlled global output disable, and QFN-32 PowerPAD™ package for thermal management in high-density LED systems.
Technical Context
The TLC5923RHBTG4 implements dual-mode serial control: MODE = L selects 16-bit ON/OFF register latching on XLAT rising edge; MODE = H enables 112-bit dot-correction data loading with XLAT level-triggered latch. Each channel features a dedicated 7-bit DC register and programmable constant-current sink set by a single external IREF resistor.
It integrates LED open detection (LOD) triggered when OUTn voltage falls below 0.3 V (typical) during active drive, and thermal error flag (TEF) activation at ~160°C junction temperature - both reported through shared open-drain XERR. Output delay of 20 ns per channel (0–300 ns total across 16 channels) mitigates inrush current during simultaneous turn-on.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channel count | 16 independent constant-current sink outputs (OUT0–OUT15) |
| Max sink current per channel | 80 mA (set by external IREF resistor; 600 Ω min yields 80 mA) |
| Dot correction resolution | 7-bit (128 steps), enabling 0–100% linear current scaling per channel |
| Serial interface speed | 30 MHz SCLK max - supports fast update rates for dynamic LED content |
| Output voltage range | Up to 17 V - compatible with high-Vf LEDs and multi-LED strings |
| Operating temperature | –40°C to +85°C - suitable for industrial and outdoor display environments |
| Supply voltage | 3.0 V to 5.5 V - interoperable with 3.3 V and 5 V logic systems |
Pinout & Package
Package: 32-pin QFN (RHB), 5 mm × 5 mm, exposed thermal pad (PowerPAD™) - optimized for low thermal resistance in high-power LED driving applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BLANK | Global output enable/disable input | High forces all 16 outputs OFF regardless of ON/OFF register state; critical for flicker-free dimming and system safety shutdown |
| XLAT | Data latch control | Rising edge latches 16-bit ON/OFF data; high-level enables 112-bit dot-correction write - mode-dependent function prevents misconfiguration |
| MODE | Serial interface mode select | Low = ON/OFF register access; High = dot-correction register access - ensures correct data width (16 vs. 112 bits) and timing behavior |
| IREF | Reference current setting terminal | Connects to GND via external resistor (600 Ω min); sets all 16 channels' max current at 40× IIREF |
| XERR | Open-drain error flag output | Drives low on thermal error (TEF) or LED open (LOD); supports wired-OR fault reporting across multiple drivers |
| SIN / SOUT / SCLK | 3-wire serial interface | Enables daisy-chaining of multiple TLC5923RHBTG4 devices; SOUT also outputs LOD status for diagnostics |
| PGND | Power ground terminals (7 pins) | Dedicated low-impedance return paths for high-current LED sinks - reduces ground bounce and improves current matching |
Key Features
| Feature | Design Value |
|---|---|
| Per-channel 7-bit dot correction | Compensates for LED binning, aging, and PCB trace variations - enables uniform luminance across large displays without hardware trimming |
| Integrated LED open detection (LOD) | Monitors each output for open-circuit failure during active drive; eliminates need for external sense resistors or monitoring circuitry |
| Thermal error flag (TEF) | Triggers at ~160°C junction temperature - provides early overtemperature warning before catastrophic failure in sealed enclosures |
| Controlled output delay | 20 ns/channel stagger (0–300 ns total) - limits peak inrush current to <1 A for 16×80 mA loads, reducing bulk capacitor requirements |
| Single-resistor current programming | One external RIREF sets full-scale current for all 16 channels - simplifies BOM, calibration, and thermal design vs. per-channel references |
Applications
| Full-Color LED Video Wall | Outdoor LED Signage |
|---|---|
Use Scenario: Driving RGB subpixels in high-resolution indoor video walls with >10,000 nits brightness. IC Role / Device Role / Timing Role: Constant-current sink for each RGB LED string; dot correction compensates for color shift and luminance drift across panels. Use Value: Enables factory-calibrated grayscale tracking and long-term color consistency without manual trim pots or per-panel firmware tuning. |
Use Scenario: Monochrome alphanumeric signs in highway billboards exposed to -40°C to +85°C ambient. IC Role / Device Role / Timing Role: High-voltage (17 V) constant-current driver with BLANK-controlled PWM dimming and thermal fault protection. Use Value: Ensures reliable operation under solar heating and cold-start conditions while reporting open-LED faults to central controller via XERR. |
| Architectural LED Lighting | Industrial Control Panel Displays |
Use Scenario: Tunable-white and color-tunable linear fixtures with 16-zone intensity control. IC Role / Device Role / Timing Role: Per-zone current sink with independent dot correction for CCT and lumen matching across fixture lengths. Use Value: Eliminates visible banding in continuous runs by correcting for LED forward voltage gradients and thermal gradients along PCB. |
Use Scenario: Status indicator arrays in factory HMIs where LED reliability impacts machine uptime. IC Role / Device Role / Timing Role: Fault-aware LED driver with LOD and TEF reporting via shared XERR bus to PLC. Use Value: Reduces mean time to repair (MTTR) by enabling remote identification of failed LEDs or overheating modules without physical inspection. |
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 VREF; no integrated LOD/TEF | Better grayscale depth (4096 levels) but lacks real-time fault detection; higher pin count (40-pin QFN) | Choose for high-fidelity grayscale where fault reporting is handled externally |
| IS31FL3731-QFLS4-TR | 16×18 matrix driver with auto-breathing, I²C interface; 8-bit current control; no XERR-style fault bus | Integrated PWM timing engine reduces MCU overhead; limited to 28 V max output; no thermal flag | Choose for compact UI lighting with embedded animation, not high-power signage |
Compared with TLC5923RHBTG4, TLC5940RHBR offers finer grayscale but adds system complexity with external reference and no fault bus, while IS31FL3731-QFLS4-TR simplifies control with I²C but sacrifices diagnostic capability and 17 V headroom needed for long LED strings.
Availability
TLC5923RHBTG4 is available at Aetrix Electronics and suitable for full-color LED video walls, outdoor signage, and architectural lighting requiring stable component supply, consistent dot-correction performance, and robust thermal/LED-fault reporting.
Supply support for TLC5923RHBTG4 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 power management ICs, with decades of expertise in precision LED control and industrial-grade reliability.
The TLC5923RHBTG4 belongs to TI's high-accuracy LED driver product line, designed specifically for demanding visual applications where per-channel current matching, fault resilience, and thermal stability are critical - not general-purpose switching or logic functions.
FAQ
What is the maximum LED string voltage supported by the TLC5923RHBTG4?
The TLC5923RHBTG4 supports up to 17 V at its OUT0–OUT15 pins, enabling direct drive of multi-LED series strings (e.g., 5× white LEDs at 3.4 V VF) without external boost circuitry. This rating is absolute maximum; recommended operating voltage remains ≤17 V with appropriate derating for thermal margin. The TLC5923RHBTG4 maintains constant current regulation across this range when supplied with adequate VCC and proper IREF configuration.
How does the TLC5923RHBTG4 implement LED open detection (LOD)?
The TLC5923RHBTG4 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). This indicates insufficient current flow due to disconnection or LED failure. Detected LOD events pull the open-drain XERR pin low and can be read back serially via SOUT. The TLC5923RHBTG4 does not require external sense resistors - LOD is fully integrated.
Can the TLC5923RHBTG4 be cascaded with other TLC5923RHBTG4 devices?
Yes - the TLC5923RHBTG4 supports daisy-chaining via SIN-to-SOUT connections. Serial data flows from one device's SOUT to the next's SIN, with shared SCLK and XLAT. Each TLC5923RHBTG4 consumes 16 bits (ON/OFF) or 112 bits (dot correction) per frame. Cascading increases total data length but preserves timing integrity; minimum SCLK frequency scales linearly with device count per Equation 3 in the datasheet. All devices in the chain share the same MODE and BLANK signals.
What is the role of the IREF pin on the TLC5923RHBTG4?
The IREF pin on the TLC5923RHBTG4 sets the full-scale current for all 16 output channels using a single external resistor to GND. An internal 1.24 V (typical) bandgap reference develops across RIREF, and the output current equals 40 × (1.24 V / RIREF). For example, a 600 Ω resistor yields 80 mA per channel. RIREF must be ≥600 Ω to avoid exceeding absolute maximum ratings. The TLC5923RHBTG4 uses this single-point calibration to ensure channel-to-channel matching within ±1% (typical).
Does the TLC5923RHBTG4 provide thermal protection?
Yes - the TLC5923RHBTG4 includes a thermal error flag (TEF) that activates when junction temperature exceeds ~160°C (typical). TEF assertion pulls the open-drain XERR pin low, signaling overtemperature condition to the host system. This is a protective alert, not an automatic shutdown - the device continues operating until junction temperature drops below the hysteresis threshold (~150°C). Thermal design must ensure the TLC5923RHBTG4's PowerPAD™ is properly soldered to maximize heat dissipation, especially at full 80 mA/channel load.
TLC5923RHBTG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 32-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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)
TLC5923RHBTG4 FAQ
1.How can I place an order for TLC5923RHBTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC5923RHBTG4 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 TLC5923RHBTG4 reliable?
The price and inventory of TLC5923RHBTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC5923RHBTG4 is usually 5 days.
3.What payment methods are accepted for TLC5923RHBTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC5923RHBTG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC5923RHBTG4?
TLC5923RHBTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC5923RHBTG4 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 TLC5923RHBTG4?
For technical support, including TLC5923RHBTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC5923RHBTG4 requirements.
6.How does Aetrix verify that TLC5923RHBTG4 is sourced from the original manufacturer or authorized distributors?
All TLC5923RHBTG4 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 TLC5923RHBTG4 meets industry standards.
7.What is the process for return or replacement of TLC5923RHBTG4?
All TLC5923RHBTG4 units undergo pre-shipment inspection (PSI). If there is an issue with TLC5923RHBTG4, 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 TLC5923RHBTG4 part is unused and in its original packaging.
Return procedure for TLC5923RHBTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLC5923RHBTG4 Tags
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BCR420UE6433HTMA1
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