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Texas Instruments TLC5928PWPR
- Part No.:
- TLC5928PWPR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 24-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TLC5928PWPR.pdf
- Description:
- IC LED DRVR LINEAR 35MA 24HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:9,113
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Product details
Overview
TLC5928PWPR 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 TLC5928PWPR datasheet, TLC5928PWPR pinout, TLC5928PWPR application, or TLC5928PWPR equivalent, key selection criteria include its HTSSOP-24 PowerPAD™ package thermal performance, ±1% channel-to-channel current accuracy, 10-ns output transient time, LOD/PTW error reporting via SOUT, and daisy-chain capability for multi-device systems.
Technical Context
The TLC5928PWPR implements a serial-input, parallel-output architecture with two cascaded 16-bit shift registers: one for on/off control data and another for status information (LOD/PTW). Data is clocked in via SIN/SCLK, latched into output drivers by LAT, and blanked globally by BLANK.
Its constant-current sink value is set externally via IREF–GND resistor (RIREF), with typical VIREF = 1.20 V. The device integrates dedicated analog comparators for LOD (threshold: 0.30 V) and thermal monitoring (PTW threshold: +138 °C typ), both reported through the same SOUT serial interface.
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 - adjustable via external RIREF; 35 mA max enables bright LED drive without external boost |
| Channel Accuracy | ±1% channel-to-channel - ensures uniform brightness across 16 LEDs without per-channel calibration |
| Data Rate | 35 MHz SCLK - supports >1 kHz refresh for full 16-channel updates, critical for flicker-free video displays |
| BLANK Pulse Width | 20 ns minimum - enables precise PWM dimming control with minimal dead-time impact on duty cycle fidelity |
| LOD Threshold | 0.30 V (typ) - detects open or GND-short LED faults while maintaining margin against forward-voltage drop variation |
| PTW Threshold | +138 °C junction temperature (typ) - provides early thermal warning before derating or shutdown is required |
Pinout & Package
Package: HTSSOP-24 PowerPAD™ (thermally enhanced, exposed thermal pad on bottom side, must be soldered to PCB ground plane for rated power dissipation).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Power ground reference | Primary return path for all 16 output sinks and internal logic; connects to thermal pad for heat dissipation |
| 2 (SIN) | Serial data input | Accepts 16-bit on/off control data LSB-first; Schmitt-triggered for noise immunity on long traces |
| 3 (SCLK) | Serial clock input | Rising-edge triggered; synchronizes data shift into internal register; supports up to 35 MHz operation |
| 4 (LAT) | Latch enable | Rising edge transfers shift-register data to output latch; also loads LOD/PTW status into shift register |
| 5–20 (OUT0–OUT15) | Constant-current sink outputs | Each independently controlled; 35-mA max sink; supports up to 17 V LED supply (VOUT range: –0.3 V to +18 V) |
| 21 (BLANK) | Global output disable | High = all outputs forced OFF; low = outputs follow latch data; rising edge captures LOD/PTW status |
| 22 (SOUT) | Serial data output | Shifts out LOD/PTW status bits MSB-first on SCLK rising edges; used for error readback in daisy-chain |
| 23 (IREF) | Current reference input/output | Internal 1.20-V reference; connects to external RIREF to set all 16 channels' sink current identically |
| 24 (VCC) | Supply voltage | 3.0–5.5 V digital and analog supply; powers logic, reference, and output drivers |
Key Features
| Feature | Design Value |
|---|---|
| 16-channel constant-current sink | Enables direct drive of 16 discrete LEDs or LED segments without external current-setting resistors per channel |
| Integrated LED open detection (LOD) | Detects open-circuit or GND-short LEDs during active drive (VOUTn ≤ 0.30 V), eliminating need for external sense circuitry |
| Pre-thermal warning (PTW) | Signals junction overtemperature (>+138 °C) via status register - allows host controller to reduce duty cycle before thermal shutdown |
| Daisy-chainable serial interface | SIN→SOUT cascade supports multi-device systems with single MCU GPIO; LAT/BLANK shared across chain |
| HTSSOP-24 PowerPAD™ package | 28.9 mW/°C thermal resistance (with PCB copper); enables 3.6 W max power dissipation at TA = +25 °C |
Applications
| LED Video Displays | Message Boards |
|---|---|
Use Scenario: High-resolution outdoor LED panels requiring synchronized, flicker-free refresh at >1 kHz. IC Role / Device Role / Timing Role: Constant-current sink driver with 10-ns output transient and 20-ns BLANK pulse for precise PWM timing. Use Value: Eliminates visible scan-line artifacts and ensures uniform brightness across 16 parallel columns per IC. |
Use Scenario: Public transit signage with remote diagnostics and long-term reliability requirements. IC Role / Device Role / Timing Role: LED driver with integrated LOD fault reporting via SOUT serial readback. Use Value: Enables automated detection of failed LEDs without visual inspection, reducing maintenance cost and downtime. |
| Illumination Systems | Industrial Control Panels |
Use Scenario: Architectural lighting arrays where thermal management and consistent color rendering are critical. IC Role / Device Role / Timing Role: Thermal-aware LED driver with PTW output signaling junction temperature exceedance. Use Value: Allows host MCU to dynamically reduce channel duty cycles before thermal derating occurs, preserving light output stability. |
Use Scenario: Factory HMIs with harsh ambient temperatures and requirement for fault resilience. IC Role / Device Role / Timing Role: Robust 16-channel LED indicator driver operating from –40°C to +85°C with ±1% current matching. Use Value: Ensures consistent LED intensity across wide temperature ranges, avoiding operator misinterpretation of status indicators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC5940PWPR | 16-channel, but adds dot-correction (6-bit per channel) and grayscale PWM (12-bit), no LOD/PTW | Better suited for high-fidelity grayscale displays; lacks built-in fault detection | Select when precise intensity grading outweighs diagnostic capability |
| MAX7219CWG+ | 8-channel, SPI interface, integrated scan driver, no LOD/PTW, 40-mA max per channel | Targets 7-segment/matrix displays; requires external current limiting for high-brightness LEDs | Select for compact numeric/alphanumeric displays with minimal MCU overhead |
Compared with TLC5928PWPR, TLC5940PWPR offers superior grayscale control but requires external fault monitoring, while MAX7219CWG+ simplifies matrix driving but halves channel count and omits thermal/error diagnostics - making TLC5928PWPR optimal for cost-sensitive, fault-aware 16-LED linear or column-based systems.
Availability
TLC5928PWPR is available at Aetrix Electronics and suitable for LED video displays, message boards, and industrial illumination systems requiring stable component supply, extended temperature operation (–40°C to +85°C), and integrated diagnostics.
Supply support for TLC5928PWPR 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 automotive and industrial qualification experience.
The TLC5928 product line delivers robust, thermally aware LED drivers for high-reliability signage and display applications - designed specifically for systems needing fault detection, daisy-chain scalability, and tight current matching without external sensing.
FAQ
What is the maximum LED supply voltage supported by the TLC5928PWPR?
The TLC5928PWPR supports an output voltage range of –0.3 V to +18 V at each OUT0–OUT15 pin. This allows direct connection to LED strings powered up to 17 V, accommodating common high-brightness white or blue LED configurations without level-shifting circuitry. The absolute maximum rating is 18 V, and operation above 17 V is not recommended per datasheet specifications.
How does the TLC5928PWPR implement LED open detection (LOD)?
The TLC5928PWPR monitors the voltage at each OUTn pin while the channel is actively sinking current. If VOUTn drops to ≤0.30 V (typical threshold), the corresponding LOD bit is set to '1' in the status information data (SID) register. This detection occurs only when BLANK is low and the output is ON, and valid LOD status requires ≥1 ms on-time for reliable capture.
Can multiple TLC5928PWPR devices be daisy-chained, and how is status data read back?
Yes - TLC5928PWPR supports daisy-chaining via SIN→SOUT connections. Status data (LOD/PTW bits) is loaded into the SID latch on BLANK's rising edge, then shifted out MSB-first from SOUT on subsequent SCLK rising edges. Each device in the chain shifts its own 16-bit status word, allowing full system-level fault visibility with one serial read sequence.
What is the role of the IREF pin on the TLC5928PWPR, and how is current set?
The IREF pin provides a stable 1.20 V (typ) internal reference voltage. Connecting an external resistor (RIREF) between IREF and GND sets the sink current for all 16 channels using IOLC ≈ 42 × (1.20 V / RIREF). For example, a 1.44 kΩ resistor yields ~35 mA. The datasheet specifies RIREF values from 1.44 kΩ (35 mA) to 25.2 kΩ (2 mA).
Does the TLC5928PWPR require external components for thermal protection?
No - the TLC5928PWPR integrates a pre-thermal warning (PTW) circuit that asserts when junction temperature exceeds +138 °C (typical). This condition sets all 16 bits of the SID register to '1', which is readable via SOUT. While PTW does not force output shutdown, it signals the host controller to reduce duty cycle - eliminating need for external thermal sensors or shutdown circuitry.
TLC5928PWPR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-PowerTSSOP (0.173", 4.40mm Width)
- 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:
- 35mA
- Frequency:
- 35MHz
- Dimming:
- -
- Applications:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-HTSSOP
TLC5928PWPR FAQ
1.How can I place an order for TLC5928PWPR through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC5928PWPR 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 TLC5928PWPR reliable?
The price and inventory of TLC5928PWPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC5928PWPR is usually 5 days.
3.What payment methods are accepted for TLC5928PWPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC5928PWPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC5928PWPR?
TLC5928PWPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC5928PWPR 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 TLC5928PWPR?
For technical support, including TLC5928PWPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC5928PWPR requirements.
6.How does Aetrix verify that TLC5928PWPR is sourced from the original manufacturer or authorized distributors?
All TLC5928PWPR 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 TLC5928PWPR meets industry standards.
7.What is the process for return or replacement of TLC5928PWPR?
All TLC5928PWPR units undergo pre-shipment inspection (PSI). If there is an issue with TLC5928PWPR, 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 TLC5928PWPR part is unused and in its original packaging.
Return procedure for TLC5928PWPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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