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Texas Instruments TLC5928DBQ
- Part No.:
- TLC5928DBQ
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
TLC5928DBQ.pdf
- Description:
- IC LED DRIVER LINEAR 35MA 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:8,713
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Product details
Overview
TLC5928DBQ from Texas Instruments is a 16-channel constant-current LED sink driver with integrated LED open detection (LOD) and pre-thermal warning (PTW). It delivers up to 35 mA per channel, supports 35-MHz serial data transfer, operates from 3.0 V to 5.5 V VCC, and features 20-ns BLANK pulse width - enabling high-refresh-rate LED video displays and message boards.
For engineers reviewing the TLC5928DBQ datasheet, TLC5928DBQ pinout, TLC5928DBQ application, or TLC5928DBQ equivalent, key selection criteria include channel-to-channel current accuracy (±1%), LED open fault reporting via SOUT, thermal monitoring capability, and compatibility with daisy-chained serial control architectures.
Technical Context
The TLC5928DBQ implements a 16-bit serial shift register followed by a parallel latch for on/off control of each constant-current sink output. Its LOD circuit monitors OUTn voltage during active sinking (VOUTn ≤ 0.30 V typ), while PTW triggers at junction temperature ≥ +138 °C (typ), both latched on BLANK rising edge and readable via SOUT.
Current regulation relies on an external resistor (RIREF) tied between IREF and GND, setting nominal sink current via internal 1.20 V reference. All 16 outputs share the same current value, with line regulation ±0.5%/V and load regulation ±1%/V - critical for uniform brightness across varying LED forward voltages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 3.0 V to 5.5 V - compatible with standard logic supply rails and tolerant of industrial voltage variation |
| Output Current | 2 mA to 35 mA per channel - set precisely by external RIREF; supports high-brightness LEDs without external current-setting components |
| Channel Accuracy | ±1% channel-to-channel - ensures consistent LED brightness across all 16 outputs in display panels |
| Data Rate | 35 MHz SCLK - enables fast update of full 16-bit frame in under 460 ns, supporting >2 kHz refresh in multiplexed systems |
| BLANK Pulse Width | 20 ns minimum - allows precise PWM dimming control with minimal dead time between frames |
| LOD Threshold | 0.30 V (typ) - reliably detects open-circuit or GND-short LEDs while rejecting noise in noisy LED string environments |
| PTW Threshold | +138 °C (typ) junction temperature - provides early thermal warning before derating or shutdown, preserving system uptime |
Pinout & Package
Package: SSOP-24 (DBQ) - 0.15 mm pitch, 8.2 mm × 3.9 mm body, exposed thermal pad (not internally connected to GND; requires PCB connection).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Power ground reference | Primary return path for all internal logic and output current; must be low-impedance to minimize on-time error |
| 2 (SIN) | Serial data input | Accepts LSB-first 16-bit on/off data; Schmitt-triggered for noise immunity in industrial wiring |
| 3 (SCLK) | Serial clock input | Rising-edge synchronized shift clock; supports up to 35 MHz for high-throughput LED control |
| 4 (LAT) | Latch enable | Rising edge transfers shift register contents to output latch; also loads LOD/PTW status into shift register |
| 5–20 (OUT0–OUT15) | Constant-current sink outputs | Each independently controlled; capable of sinking up to 35 mA with <30 ns rise/fall times |
| 21 (BLANK) | Global output disable | High level forces all outputs OFF; rising edge latches LOD/PTW status into SID register |
| 22 (SOUT) | Serial data output | Shifts out LOD/PTW status bits (MSB first) or daisy-chain data; CMOS-compatible output drive |
| 23 (IREF) | Current reference terminal | Connects to external resistor to set all 16 channels' sink current; internal 1.20 V reference |
| 24 (VCC) | Supply voltage | 3.0–5.5 V logic and output driver supply; powers internal logic, shift register, and current sources |
Key Features
| Feature | Design Value |
|---|---|
| 16-channel constant-current sink | Enables uniform brightness across large LED arrays without per-channel resistors or calibration |
| Integrated LED open detection (LOD) | Detects open or GND-short LEDs during active sinking, reporting faults via serial readback for predictive maintenance |
| Pre-thermal warning (PTW) | Signals thermal stress at +138 °C (typ), allowing host controller to reduce duty cycle before thermal shutdown |
| 20-ns BLANK pulse width | Minimizes blanking overhead in high-refresh applications such as outdoor video signage and stadium displays |
| Daisy-chainable serial interface | SIN/SOUT architecture supports cascading multiple TLC5928DBQ devices with single MCU GPIO and clock line |
| CMOS logic-level I/O | Compatible with 3.3 V and 5 V microcontrollers without level-shifting, reducing BOM count and layout complexity |
Applications
| LED Video Displays | Message Boards |
|---|---|
Use Scenario: Outdoor full-color LED video wall with 16×N pixel modules driven by column scanning. IC Role / Device Role / Timing Role: Constant-current sink driver for red/green/blue LED columns; synchronizes ON/OFF timing across 16 outputs using LAT and BLANK. Use Value: ±1% channel accuracy ensures color fidelity; 35-MHz SCLK enables sub-millisecond frame updates for smooth motion rendering. |
Use Scenario: Public transit schedule board with segmented alphanumeric LED displays requiring long-term reliability. IC Role / Device Role / Timing Role: LED driver with built-in open-circuit fault detection for unattended operation. Use Value: LOD reports failed segments via SOUT, enabling remote diagnostics and scheduled maintenance instead of reactive service calls. |
| Illumination Systems | Industrial Control Panels |
Use Scenario: Architectural accent lighting with programmable intensity and thermal management. IC Role / Device Role / Timing Role: High-current sink driver for white LED strings; PTW flag triggers dimming before thermal derating. Use Value: Pre-thermal warning allows graceful brightness reduction rather than abrupt failure, extending LED lifetime and user experience. |
Use Scenario: Factory HMI panel with status indicator LEDs subject to vibration, ESD, and ambient temperature extremes. IC Role / Device Role / Timing Role: Robust LED driver with GND-referenced fault detection and wide VCC range (3.0–5.5 V). Use Value: ±1% device-to-device current matching ensures consistent indicator brightness across multiple identical panels in production. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar constant-current LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC5940QPWR | 16-channel, but includes dot-correction (6-bit grayscale) and internal reference; no LOD/PTW; requires external VREF for current setting | Better suited for grayscale-accurate displays; lacks fault detection for maintenance-critical signage | Select when per-channel grayscale control is required over fault reporting |
| MAX7219CWG+ | 8-digit/64-LED scan driver with SPI interface; integrated decode/driver; no constant-current sink per pin (uses segment drivers) | Designed for 7-segment/matrix displays; not suitable for high-current discrete LED strings | Select for numeric/alphanumeric displays with integrated decoding, not for general-purpose LED sink arrays |
Compared with TLC5928DBQ, TLC5940QPWR offers finer grayscale control but omits LED health monitoring, while MAX7219CWG+ targets digit-specific applications with fixed topology - making TLC5928DBQ uniquely balanced for fault-aware, high-current, serially controlled LED arrays.
Availability
TLC5928DBQ is available at Aetrix Electronics and suitable for LED video displays, message boards, and industrial illumination systems requiring stable component supply, long-lifecycle support, and traceable sourcing for production programs.
Supply support for TLC5928DBQ 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 technologies, with decades of expertise in LED driver innovation.
The TLC5928 product line was designed specifically for high-reliability, serially controlled LED array applications - emphasizing fault detection, thermal awareness, and tight current matching in demanding visual communication systems.
FAQ
What is the maximum LED supply voltage supported by the TLC5928DBQ?
The TLC5928DBQ supports LED power-supply voltage up to 17 V at its OUTx pins, enabling direct drive of multi-LED series strings without external high-voltage transistors. This rating is independent of VCC (3.0–5.5 V) and applies across the full operating temperature range (–40°C to +85°C). The absolute maximum output voltage is +18 V, but continuous operation above 17 V is not recommended per TI's recommended operating conditions.
How does the TLC5928DBQ report LED open faults?
The TLC5928DBQ reports LED open faults through its LED Open Detection (LOD) circuit, which monitors each OUTx pin voltage during active sinking. If VOUTn ≤ 0.30 V (typ), the corresponding LOD bit is set to '1' in the Status Information Data (SID) register. These bits are latched on the rising edge of BLANK and shifted out serially via SOUT after a LAT pulse - allowing the host controller to identify exactly which channel has failed.
Can multiple TLC5928DBQ devices be daisy-chained, and how is data routed?
Yes, multiple TLC5928DBQ devices can be daisy-chained using SIN and SOUT. Serial data enters the first device via SIN, shifts through its 16-bit register, and exits via SOUT to the SIN of the next device. LAT and BLANK are shared across all devices in the chain, ensuring synchronized latching and blanking. This architecture reduces MCU pin count and simplifies PCB routing for large LED arrays.
What is the role of the IREF pin on the TLC5928DBQ?
The IREF pin on the TLC5928DBQ connects to an external resistor (RIREF) tied to GND, establishing the reference for all 16 constant-current sinks. An internal 1.20 V bandgap reference develops across RIREF, setting the nominal output current as IOUT = 42 × (1.20 V / RIREF). For example, a 1.44 kΩ resistor yields ~35 mA per channel. The IREF pin also functions as an output during status readback, though it is primarily an input for current setting.
Does the TLC5928DBQ provide thermal protection, and how is it signaled?
The TLC5928DBQ includes pre-thermal warning (PTW) - not full thermal shutdown - triggered when junction temperature exceeds +138 °C (typ). The PTW flag sets all 16 bits of the SID register to '1', overriding individual LOD bits and signaling thermal stress via SOUT. This allows the host controller to proactively reduce duty cycle or brightness before reaching critical temperature, preserving system functionality and LED lifetime. The TLC5928DBQ itself continues normal operation during PTW.
TLC5928DBQ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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:
- 35mA
- Frequency:
- 35MHz
- Dimming:
- -
- Applications:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SSOP
TLC5928DBQ FAQ
1.How can I place an order for TLC5928DBQ through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC5928DBQ 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 TLC5928DBQ reliable?
The price and inventory of TLC5928DBQ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC5928DBQ is usually 5 days.
3.What payment methods are accepted for TLC5928DBQ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC5928DBQ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC5928DBQ?
TLC5928DBQ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC5928DBQ 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 TLC5928DBQ?
For technical support, including TLC5928DBQ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC5928DBQ requirements.
6.How does Aetrix verify that TLC5928DBQ is sourced from the original manufacturer or authorized distributors?
All TLC5928DBQ 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 TLC5928DBQ meets industry standards.
7.What is the process for return or replacement of TLC5928DBQ?
All TLC5928DBQ units undergo pre-shipment inspection (PSI). If there is an issue with TLC5928DBQ, 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 TLC5928DBQ part is unused and in its original packaging.
Return procedure for TLC5928DBQ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLC5928DBQ Tags
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BCR420UE6433HTMA1
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HV9910CLG-G
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