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Texas Instruments TLC5923RHBRG4
- Part No.:
- TLC5923RHBRG4
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
TLC5923RHBRG4.pdf
- Description:
- IC LED DRIVER LINEAR 80MA 32VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,629
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Product details
Overview
TLC5923RHBRG4 from Texas Instruments is a 16-channel constant-current LED sink driver with 7-bit per-channel dot correction (128-step brightness adjustment), ±1% typical current accuracy, and 0–80 mA programmable output per channel. It operates from 3.0 V to 5.5 V supply and supports up to 17 V LED supply voltage, used in full-color LED displays and signage requiring precise current matching across channels.
For engineers reviewing the TLC5923RHBRG4 datasheet, TLC5923RHBRG4 pinout, TLC5923RHBRG4 application, or TLC5923RHBRG4 equivalent, key selection criteria include its 30 MHz serial interface, thermal error flag (TEF) and LED open detection (LOD), BLANK-controlled global output disable, and QFN-32 PowerPAD™ package for thermal performance in high-density LED arrays.
Technical Context
The TLC5923RHBRG4 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 with XLAT level-triggered write. Each channel's current is set by external IREF resistor (600 Ω min), scaled 40× from internal 1.24 V reference.
It integrates graduated 20 ns inter-channel turn-on delay to suppress inrush current, open-drain XERR reporting of LOD/TEF faults, and PGND-separated power grounds for noise isolation. Output switching achieves 10 ns rise/fall times at 5 V, supporting high-refresh-rate LED video applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output channels | 16 independent constant-current sinks with individual 7-bit dot correction |
| Max sink current | 80 mA per channel (with RIREF = 600 Ω); 90 mA absolute max rating |
| Current accuracy | ±1% typical channel-to-channel matching; ±4% device-to-device variation |
| Serial interface | 30 MHz SCLK max; MSB-first 16-bit (ON/OFF) or 112-bit (dot correction) data packets |
| LED supply voltage | Up to 17 V applied to OUTn pins; enables high-Vf LED strings without external drivers |
| Thermal protection | TEF triggers at 160°C junction temperature; XERR pulled low to indicate overtemperature |
| Package | 32-pin QFN (RHB), 5 mm × 5 mm, with exposed thermal pad (PowerPAD™) |
Pinout & Package
32-pin QFN (RHB) package with exposed thermal pad (PowerPAD™) for enhanced thermal dissipation; 27.86 mW/°C derating above 25°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT0–OUT15 | Constant-current sink outputs | 16 individually controllable LED cathode connections; each supports up to 80 mA sink current |
| SIN / SOUT | Serial data input/output | SIN accepts MSB-first serial data; SOUT outputs cascaded data or LOD status bits |
| SCLK | Serial clock input | Rising edge shifts data into internal shift register; supports up to 30 MHz operation |
| XLAT | Data latch control | Rising edge latches ON/OFF data; high-level enables dot-correction register write |
| MODE | Interface mode select | Low = ON/OFF mode (16-bit shift register); High = dot-correction mode (112-bit shift register) |
| BLANK | Global output enable | High forces all OUTn OFF regardless of register state; enables fast blanking for PWM dimming |
| IREF | Reference current setting | Connects to GND via external resistor; sets max channel current as IOUT = 40 × (1.24 V / RIREF) |
| XERR | Error flag output | Open-drain; pulled low on LOD (open LED) or TEF (overtemperature); supports wired-OR fault bus |
| PGND | Power ground | Separate ground pins (6 total) reduce ground bounce and improve current-source stability |
| GND | Digital ground | Logic ground reference for BLANK, XLAT, SCLK, SIN, MODE, SOUT, XERR |
| VCC | Digital supply | 3.0–5.5 V logic supply; powers internal registers, shift logic, and interface circuitry |
Key Features
| Feature | Design Value |
|---|---|
| Per-channel dot correction | 7-bit (128-step) independent brightness trimming to compensate LED Vf and luminance variance |
| LED open detection (LOD) | Monitors each OUTn voltage during ON state; flags open-circuit LEDs via XERR or SOUT readback |
| Controlled in-rush current | 20 ns inter-channel output delay prevents simultaneous turn-on; reduces peak supply current demand |
| Thermal error flag (TEF) | Internal junction temperature monitoring at 160°C threshold; enables system-level thermal shutdown |
| Cascadable serial interface | SOUT-to-SIN daisy-chaining supports multi-device LED arrays without additional controller I/O |
| CMOS-compatible I/O | All digital inputs accept 0.8×VCC high and 0.2×VCC low thresholds; outputs drive 1 mA at 5 V |
Applications
| Full-Color LED Video Display | Monochrome LED Signage |
|---|---|
Use Scenario: Driving RGB pixel modules in outdoor large-format video walls with >1000 nits brightness and 3840 Hz refresh rate. IC Role / Device Role / Timing Role: Constant-current sink for each color sub-pixel; dot correction compensates binning variance across thousands of LEDs. Use Value: Enables uniform luminance and chromaticity across display surface using single external IREF resistor and per-channel 7-bit calibration. |
Use Scenario: Controlling segmented alphanumeric characters in transportation signage with high ambient light rejection. IC Role / Device Role / Timing Role: 16-channel sink driver for discrete LED segments; BLANK pin synchronized to system PWM for flicker-free dimming. Use Value: Eliminates need for discrete current-limiting resistors per segment, reducing BOM count and PCB area while maintaining ±1% current accuracy. |
| LED Backlight for Industrial HMI | Multicolor Architectural Lighting |
Use Scenario: Uniform backlighting for 10.1" industrial touch panels operating continuously at 70°C ambient. IC Role / Device Role / Timing Role: Thermal-aware LED driver with TEF reporting; PGND separation minimizes noise coupling into analog sensor circuits. Use Value: Prevents thermal runaway in sealed enclosures by triggering system shutdown before junction exceeds 160°C. |
Use Scenario: Dynamic color-tuning fixtures using mixed white + amber + red LEDs for hospitality lighting control. IC Role / Device Role / Timing Role: Independent current control per LED type; dot correction adjusts for differing Vf and aging rates across emitters. Use Value: Maintains consistent correlated color temperature (CCT) over 50,000 hours by reprogramming DC registers via I²C-to-SPI bridge. |
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; no LOD/TEF; requires external VREF | Better grayscale depth (4096 steps) but lacks fault detection; higher pin count (32 vs 32, but different pinout) | Select when high-resolution PWM dimming is prioritized over diagnostics and thermal safety. |
| MAX7219CWG+ | 8-channel, SPI interface only; integrated scan logic; no dot correction; 500 mA max per channel | Designed for 7-segment/matrix displays; includes BCD decode and intensity control; no per-channel current trim | Select for simple numeric displays where per-LED calibration is unnecessary and higher current per channel is required. |
Compared with TLC5923RHBRG4, TLC5940RHBR offers finer grayscale but sacrifices built-in fault detection and thermal monitoring, while MAX7219CWG+ simplifies matrix driving but eliminates per-channel dot correction-making TLC5923RHBRG4 optimal for calibrated full-color LED systems requiring reliability and serviceability.
Availability
TLC5923RHBRG4 is available at Aetrix Electronics and suitable for full-color LED video displays, monochrome signage, and industrial backlighting requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for TLC5923RHBRG4 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 solutions with over 50 years of innovation in power management and signal chain ICs.
The TLC5923RHBRG4 belongs to TI's high-precision LED driver product line, designed specifically for applications demanding per-channel current matching, real-time fault diagnostics, and thermal resilience in commercial and industrial LED systems.
FAQ
What is the maximum LED supply voltage supported by the TLC5923RHBRG4?
The TLC5923RHBRG4 supports up to 17 V applied to its OUT0–OUT15 pins, enabling direct drive of multi-LED series strings without external boost circuitry. This rating is specified under recommended operating conditions and remains valid across the full –40°C to +85°C temperature range. The 17 V limit ensures safe operation with common high-brightness white and blue LEDs having forward voltages up to 3.6 V per diode in 4–5 diode configurations.
How does the TLC5923RHBRG4 implement LED open detection (LOD)?
The TLC5923RHBRG4 detects open LEDs by monitoring each OUTn voltage during active sink operation: when BLANK is low, the corresponding ON/OFF bit is high, and the output voltage falls below 0.3 V (typical), the device flags an open condition. This status is reported collectively via XERR or read individually through SOUT after latching with XLAT, allowing precise identification of failed LEDs in large arrays without manual probing.
Can the TLC5923RHBRG4 be used in cascaded configurations, and how is data routed?
Yes, the TLC5923RHBRG4 supports daisy-chained operation: the SOUT pin of one device connects to the SIN pin of the next, enabling single-controller control of multiple ICs. Serial data propagates through the chain on SCLK edges, with XLAT synchronizing latch events across all devices. Cascading preserves timing integrity because each device processes its own 16-bit (ON/OFF) or 112-bit (dot correction) portion of the full packet, eliminating software overhead for multi-device updates.
What is the role of the MODE pin on the TLC5923RHBRG4?
The MODE pin selects between two distinct serial interface modes: when MODE = L, the device accepts 16-bit ON/OFF data with edge-triggered latching on XLAT rising edge; when MODE = H, it accepts 112-bit dot-correction data with level-triggered write enabled while XLAT is high. This dual-mode architecture separates functional control (on/off) from calibration (brightness trim), preventing accidental corruption of dot-correction settings during routine display updates.
How is the output current set on the TLC5923RHBRG4, and what is the minimum IREF resistor value?
The TLC5923RHBRG4 sets maximum per-channel current using an external resistor (RIREF) between IREF and GND. With a fixed 1.24 V internal reference, IOUT(MAX) = 40 × (1.24 V / RIREF). The datasheet specifies a minimum RIREF of 600 Ω to limit IREF to 2.07 mA and prevent exceeding the 80 mA per-channel limit. Using 600 Ω yields 82.7 mA theoretical max, aligning with the 80 mA typical specification and 90 mA absolute maximum rating.
TLC5923RHBRG4 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)
TLC5923RHBRG4 FAQ
1.How can I place an order for TLC5923RHBRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC5923RHBRG4 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 TLC5923RHBRG4 reliable?
The price and inventory of TLC5923RHBRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC5923RHBRG4 is usually 5 days.
3.What payment methods are accepted for TLC5923RHBRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC5923RHBRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC5923RHBRG4?
TLC5923RHBRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC5923RHBRG4 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 TLC5923RHBRG4?
For technical support, including TLC5923RHBRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC5923RHBRG4 requirements.
6.How does Aetrix verify that TLC5923RHBRG4 is sourced from the original manufacturer or authorized distributors?
All TLC5923RHBRG4 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 TLC5923RHBRG4 meets industry standards.
7.What is the process for return or replacement of TLC5923RHBRG4?
All TLC5923RHBRG4 units undergo pre-shipment inspection (PSI). If there is an issue with TLC5923RHBRG4, 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 TLC5923RHBRG4 part is unused and in its original packaging.
Return procedure for TLC5923RHBRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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