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Texas Instruments TLC5943RHBT
- Part No.:
- TLC5943RHBT
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
TLC5943RHBT.pdf
- Description:
- IC LED DRIVER LINEAR 50MA 32VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:653
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Product details
Overview
TLC5943RHBT from Texas Instruments is a 16-channel, 16-bit enhanced spectrum PWM LED driver with 7-bit global brightness control, constant-current sink outputs (50 mA per channel), LED open detection (LOD), and thermal error flag (TEF). It operates from 3.0 V to 5.5 V supply and supports up to 17 V LED supply voltage, targeting high-precision LED signage and full-color display backlighting.
For engineers reviewing the TLC5943RHBT datasheet, TLC5943RHBT pinout, TLC5943RHBT application, or TLC5943RHBT equivalent, key selection criteria include its 33-MHz grayscale clock capability, 65,536-step grayscale resolution, daisy-chainable serial interface, QFN-32 package with exposed thermal pad, and integrated LOD/TEF diagnostics for robust LED array monitoring.
Technical Context
The TLC5943RHBT implements an Enhanced Spectrum (ES) PWM architecture that divides each display period into 128 segments and distributes ON-time across multiple GSCLK cycles to reduce electromagnetic interference and improve visual smoothness. Its dual-latch grayscale and brightness shift registers support independent 16-bit (GS) and 7-bit (BC) data loading via SIN/SCLK/BCSEL/XLAT.
It integrates a precision reference current circuit tied to IREF–GND, enabling ±1.5% channel-to-channel and ±3% device-to-device constant-current accuracy. Thermal shutdown activates at +150°C junction temperature with +10°C hysteresis, and LOD detects both open-circuit and short-to-GND LED faults during active display periods.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 16 independent constant-current sink outputs (OUT0–OUT15) |
| Grayscale resolution | 16-bit (65,536 steps) with ES-PWM timing for reduced flicker and EMI |
| Brightness control | 7-bit (128 steps) global current scaling applied uniformly across all channels |
| Max sink current | 50 mA per channel, set by external RIREF resistor (984 Ω–9.84 kΩ) |
| Supply voltage | VCC = 3.0 V to 5.5 V; LED supply up to 17 V on OUT pins |
| Operating temp | –40°C to +85°C ambient; thermal shutdown at +150°C junction |
| Data rate | 30 MHz serial data clock (SCLK); 33 MHz grayscale clock (GSCLK) |
Pinout & Package
Package: 5 mm × 5 mm QFN-32 with exposed thermal pad (PowerPAD™), RoHS-compliant, moisture-sensitive level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SIN (Pin 2) | Serial input | CMOS Schmitt-triggered data input for grayscale/brightness shift registers |
| SCLK (Pin 1) | Serial clock | Rising-edge-triggered clock for shifting data into selected register (GS or BC) |
| BCSEL (Pin 3) | Register select | Low = grayscale register; high = brightness register; must not change while SCLK high |
| XLAT (Pin 32) | Latch strobe | Low-to-high transition transfers shift register contents to first data latch |
| BLANK (Pin 31) | Global disable | High = all outputs forced OFF, grayscale counter reset, PWM controller initialized |
| GSCLK (Pin 24) | PWM timing | Rising edge increments grayscale counter; active only when BLANK is low |
| IREF (Pin 26) | Current reference | Connect external resistor to GND to set max sink current (VIREF = 1.20 V typical) |
| SOUT (Pin 23) | Serial output | Daisy-chain output; mirrors MSB of selected shift register (GS or BC) |
| XERR (Pin 22) | Error flag | Open-drain output pulled low on LOD or TEF detection |
| OUT0–OUT15 (Pins 4–21) | Current sinks | 16 constant-current outputs; each capable of 50 mA sink into up to 17 V load |
| VCC (Pin 27) | Logic supply | 3.0 V–5.5 V digital core and interface power |
| GND (Pin 30) | Ground | Common reference for logic, analog, and thermal pad |
| XTEST (Pin 25) | Factory test | Must be tied to VCC or GND; no user function |
Key Features
| Feature | Design Value |
|---|---|
| Enhanced Spectrum PWM | Distributes 16-bit ON-time across 128 display segments to minimize visible flicker and conducted EMI |
| LED Open Detection | Continuous in-display monitoring of open-circuit and short-to-GND faults per channel |
| Thermal Error Flag | Automatically disables all outputs at +150°C junction and restarts after cooling by ≥10°C |
| 4-channel grouped delay | Staggers output switching to limit inrush current and reduce peak supply demand |
| Auto display repeat | Hardware-enabled continuous grayscale refresh without host CPU intervention |
Applications
| Monochrome LED Signboards | Full-Color RGB Display Backlighting |
|---|---|
Use Scenario: Outdoor alphanumeric signage using discrete red, green, and blue LEDs arranged in dot-matrix arrays. IC Role / Device Role / Timing Role: Constant-current sink driver providing precise grayscale and global brightness control per LED segment. Use Value: Enables smooth 65,536-step intensity gradation and synchronized multi-channel dimming for high-contrast, low-flicker text rendering. | Use Scenario: Edge-lit LCD backlight for industrial HMIs requiring uniform luminance and color stability across wide temperature ranges. IC Role / Device Role / Timing Role: Independent current regulation for red, green, blue, and white LED strings with real-time fault reporting. Use Value: LOD detection prevents localized hotspots; thermal flag ensures safe operation during extended high-brightness use. |
| Multicolor Information Displays | Architectural LED Lighting Control |
Use Scenario: Indoor public information panels using tri-color (RGB) LED modules for dynamic content and status indication. IC Role / Device Role / Timing Role: Serially daisy-chained driver managing 16×N LED channels with synchronized grayscale updates. Use Value: 30-MHz SCLK enables rapid frame updates; auto-refresh reduces MCU overhead for static content display. | Use Scenario: High-reliability architectural lighting systems where long-term LED health monitoring is critical. IC Role / Device Role / Timing Role: Fault-aware current sink controlling distributed LED loads with thermal derating and open-circuit logging. Use Value: XERR flag integration simplifies system-level diagnostics; ±1.5% channel matching ensures consistent color mixing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC5947RGER | 24-channel variant with identical 16-bit GS/7-bit BC architecture, same QFN-32 package, but higher ICC3/ICC4 supply current | Supports larger LED arrays without additional ICs; requires re-layout for 24-output routing | Select when expanding channel count beyond 16 while retaining ES-PWM timing and diagnostic features |
| IS31FL3731-QFLS4-TR | 18×16 matrix driver with built-in RAM, I²C interface, and lower 40-mA per-channel rating; no LOD/TEF flags | Reduces host MCU overhead via internal frame buffer; lacks hardware fault reporting | Prefer for space-constrained designs needing simplified control and moderate current drive |
Compared with TLC5943RHBT, TLC5947RGER offers direct scalability to 24 channels with identical timing and diagnostics, whereas IS31FL3731-QFLS4-TR trades fault awareness and current capability for integrated memory and I²C simplicity-making it suitable for less demanding, cost-sensitive lighting nodes.
Availability
TLC5943RHBT is available at Aetrix Electronics and suitable for monochrome signboards, full-color display backlighting, multicolor information displays, and architectural LED lighting requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for TLC5943RHBT 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 U.S.-based semiconductor company specializing in analog, embedded processing, and high-reliability power management solutions.
The TLC5943RHBT belongs to TI's high-precision LED driver product line, engineered for applications demanding accurate grayscale control, robust fault detection, and thermally stable constant-current performance in commercial and industrial displays.
FAQ
What is the maximum LED supply voltage supported by the TLC5943RHBT?
The TLC5943RHBT supports up to 17 V on its OUT0–OUT15 pins, enabling direct drive of multi-LED series strings powered from common industrial or signage DC rails. This rating is independent of the 3.0–5.5 V VCC logic supply, allowing flexible system partitioning between control and LED power domains. The absolute maximum output voltage is specified as –0.3 V to +18 V relative to GND.
How does the TLC5943RHBT implement LED open detection (LOD)?
The TLC5943RHBT performs continuous LOD during active display periods by monitoring voltage at each OUTn pin while the channel is commanded ON. If the voltage exceeds 0.3 V (typical), indicating insufficient current flow due to an open or high-resistance connection, the corresponding bit in the LOD latch is set and reflected in the XERR flag. LOD also detects short-to-GND faults by identifying abnormally low forward voltage under drive conditions.
Can the TLC5943RHBT be daisy-chained, and what interface signals are required?
Yes, the TLC5943RHBT supports daisy-chaining via its SIN and SOUT pins. Data is shifted in through SIN, latched with XLAT, and forwarded to the next device's SIN via SOUT. SCLK, BCSEL, XLAT, BLANK, and GSCLK must be shared across all devices in the chain. This configuration allows scalable control of hundreds of LEDs using a single microcontroller SPI port with minimal GPIO usage.
What is the role of the IREF pin, and how is output current calibrated?
The IREF pin provides a 1.20 V (typ) internal reference voltage. Connecting an external resistor (RIREF) between IREF and GND sets the maximum sink current per channel (IOLCMax) using the formula IOLCMax ≈ 41 × (1.20 V / RIREF). For example, a 1 kΩ resistor yields ~49 mA. Channel currents are then scaled linearly by 7-bit brightness control data, preserving relative accuracy across the 0–100% range.
Does the TLC5943RHBT require external components for thermal management?
Yes-the TLC5943RHBT's QFN-32 package includes an exposed thermal pad (PowerPAD™) that must be soldered to a PCB copper area for effective heat dissipation. With proper 2 oz. copper thermal land, the device achieves 27.86 mW/°C thermal resistance, supporting up to 3482 mW total power dissipation at +25°C ambient. Without thermal pad soldering, power handling drops significantly, risking thermal shutdown under sustained 50-mA/channel operation.
TLC5943RHBT 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:
- 50mA
- Frequency:
- 30MHz
- Dimming:
- -
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-VQFN (5x5)
TLC5943RHBT FAQ
1.How can I place an order for TLC5943RHBT through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC5943RHBT 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 TLC5943RHBT reliable?
The price and inventory of TLC5943RHBT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC5943RHBT is usually 5 days.
3.What payment methods are accepted for TLC5943RHBT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC5943RHBT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC5943RHBT?
TLC5943RHBT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC5943RHBT 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 TLC5943RHBT?
For technical support, including TLC5943RHBT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC5943RHBT requirements.
6.How does Aetrix verify that TLC5943RHBT is sourced from the original manufacturer or authorized distributors?
All TLC5943RHBT 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 TLC5943RHBT meets industry standards.
7.What is the process for return or replacement of TLC5943RHBT?
All TLC5943RHBT units undergo pre-shipment inspection (PSI). If there is an issue with TLC5943RHBT, 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 TLC5943RHBT part is unused and in its original packaging.
Return procedure for TLC5943RHBT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLC5943RHBT Tags
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BCR402RE6327HTSA1
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BCR430UXTSA2
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BCR420UE6433HTMA1
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BCR420UE6327HTSA1
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BCR421UE6327HTSA1
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LYT1604D-TL
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HV9910CLG-G
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CL2N8-G
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BCR420UW6-7
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BCR421UW6-7
Diodes Incorporated
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BCR420UFD-7
Diodes Incorporated
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BCR421UFD-7
Diodes Incorporated
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