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Texas Instruments TLC5927IDWR
- Part No.:
- TLC5927IDWR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
TLC5927IDWR.pdf
- Description:
- IC LED DRVR LINEAR 120MA 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,430
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Product details
Overview
TLC5927IDWR from Texas Instruments is a 16-channel constant-current LED sink driver IC designed for high-reliability LED display and lighting systems. It delivers precise 5–120 mA per channel via external R-EXT resistor, supports 3.0–5.5 V logic supply, features open-load and shorted-load detection (TLC5927-exclusive), and operates with up to 17 V output voltage headroom - enabling robust driving of multi-VF LED strings in signage and automotive interior lighting.
For engineers reviewing the TLC5927IDWR datasheet, TLC5927IDWR pinout, TLC5927IDWR application, or TLC5927IDWR equivalent, this page provides verified functional context, validated pin roles, confirmed error-detection behavior, real-world timing constraints (30 MHz max clock), and cross-reference alternatives with documented differences in fault coverage and current accuracy.
Technical Context
The TLC5927IDWR integrates a 16-bit serial-in/parallel-out shift register with independent output latches, enabling daisy-chainable LED control. Its output stage uses regulated current sinks with thermal shutdown and per-channel overtemperature sensing - global trip at ~170°C, channel-specific trip at 150–200°C.
It implements dual-mode operation: Normal Mode for LED driving (via CLK/LE/SDI/SDO/OE) and Special Mode triggered by OE(ED2) pulse, where LE(ED1) selects between error status readback (16-bit SDO stream) or 256-step global current gain programming (1/12 to 127/128). Short-circuit detection - exclusive to TLC5927 - compares VOUT against 2.4–3.1 V trigger and 2.2 V return thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output channels | 16 constant-current sink outputs (OUT0–OUT15), each programmable 5–120 mA |
| Supply voltage | 3.0 V to 5.5 V logic supply; output stage supports up to 17 V (VLED) |
| Current accuracy | ±6% max channel-to-channel and die-to-die error (10–50 mA range) |
| Error detection | Open-load, shorted-load (TLC5927 only), and overtemperature - all reported via 16-bit SDO status code |
| Max clock frequency | 30 MHz - enables fast refresh in high-resolution LED panels and video-rate signage |
| Input interface | Schmitt-trigger inputs (CLK, LE, OE, SDI); SDO supports cascaded daisy-chain topology |
| Thermal protection | Global shutdown at 150–200°C; per-channel shutdown with automatic restart after cooling |
Pinout & Package
Package: DW (SOIC-24), body size 15.40 mm × 7.50 mm, exposed thermal pad (not electrically connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Ground reference | Common return for logic and current-sink paths; must be low-impedance connection to minimize noise and thermal rise |
| SDI | Serial data input | Accepts 3.3 V/5 V CMOS-level data; feeds 16-bit shift register on CLK rising edge |
| CLK | Clock input | Rising-edge-triggered; 30 MHz max; requires clean signal to avoid bit errors in cascade chains |
| LE(ED1) | Latch enable / mode control | High → latches shift register to output latch (Normal Mode); positive pulse enters Special Mode for error read or gain config |
| OE(ED2) | Output enable / mode trigger | Low → enables all 16 outputs; one-clock pulse triggers transition to Special Mode |
| R-EXT | Current-setting reference | Connects external resistor (e.g., 720 Ω for 26 mA) to set base current; tolerance directly impacts output accuracy |
| SDO | Serial data output | Drives next device's SDI or controller; outputs 16-bit error status or configuration code in Special Mode |
| VDD | Logic supply | 3.0–5.5 V; powers internal logic, shift register, and control circuitry - separate from VLED |
| OUT0–OUT15 | Constant-current sinks | Each drives LED cathode to GND; supports 17 V max VLED; no external current-limiting resistors needed |
Key Features
| Feature | Design Value |
|---|---|
| Short-circuit detection | Exclusive to TLC5927; detects VOUT > 2.4 V (trigger) and resets at < 2.2 V - critical for automotive LED modules with variable wiring resistance |
| 256-step current gain | Runtime-programmable global gain (1/12 to 127/128) via LE(ED1)-latched 8-bit code - enables white-balance tuning in RGB displays without hardware change |
| Daisy-chain capability | SDI/SDO interface allows unlimited cascading; eliminates parallel bus routing and reduces MCU GPIO count in large LED arrays |
| Per-channel thermal shutdown | Independent channel-level overtemperature sensing prevents single-fault propagation - maintains partial illumination in signage during localized overheating |
| Open-load + short-load reporting | Single 16-bit SDO status word reports all faults simultaneously - simplifies diagnostics in safety-critical lighting (e.g., emergency exit signs) |
Applications
| Automotive Interior Lighting | LED Video Signage |
|---|---|
Use Scenario: Driving RGB LED clusters in dashboard backlighting and ambient mood lighting with strict thermal and fault-detection requirements. IC Role / Device Role / Timing Role: Constant-current sink driver with per-channel thermal monitoring and short-circuit detection to prevent wiring fault-induced failures. Use Value: Enables fail-safe operation under vibration-induced shorts and ensures consistent luminance across temperature ranges (–40°C to 125°C). |
Use Scenario: High-refresh-rate monochrome or full-color outdoor LED billboards requiring synchronized pixel control and fault visibility. IC Role / Device Role / Timing Role: Serial-input LED driver supporting 30 MHz clock for sub-millisecond frame updates across thousands of pixels. Use Value: Reduces MCU load via daisy-chained SDO/SDI and delivers real-time open-load status for rapid pixel failure isolation. |
| Industrial Control Panels | White Goods Display Modules |
Use Scenario: Status indicator arrays on HVAC controllers and PLC interfaces where long-term reliability and diagnostic transparency are mandatory. IC Role / Device Role / Timing Role: Fault-aware LED driver providing open-load detection to confirm LED integrity during startup and runtime. Use Value: Eliminates need for external sense resistors or optical feedback; built-in error reporting reduces BOM and firmware complexity. |
Use Scenario: Appliance front-panel LED displays (ovens, refrigerators) operating in thermally constrained enclosures with variable line voltage. IC Role / Device Role / Timing Role: Wide-input-voltage (3–5.5 V) constant-current driver with thermal shutdown to sustain operation during cabinet heat buildup. Use Value: Maintains consistent brightness despite supply droop and prevents thermal runaway in sealed plastic housings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED sink driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC5926IDWR | No short-circuit detection; identical pinout, current range, and timing - shares same SOIC-24 package and R-EXT interface | Suitable where only open-load and thermal faults matter (e.g., indoor signage), but not for automotive or safety-critical short-risk environments | Select when cost sensitivity outweighs need for short-circuit diagnostics; verify system-level fault coverage requirements |
| IS31FL3728-QFLS4-TR | 28-channel, I²C interface, integrated PWM dimming; no SDO daisy-chain or open/short detection - uses different communication protocol and fault model | Better suited for compact, low-pin-count designs with microcontroller I²C availability; lacks real-time serial error reporting | Choose for space-constrained consumer electronics where I²C simplifies layout, but accept loss of cascaded diagnostics and higher software overhead |
Compared with TLC5926IDWR, the TLC5927IDWR adds short-circuit detection at identical cost and footprint - making it the preferred choice where wiring integrity is unverifiable. Versus IS31FL3728, TLC5927IDWR offers deterministic serial timing, hardware-level fault reporting, and proven robustness in industrial temperature cycling - critical for fixed-installation lighting.
Availability
TLC5927IDWR is available at Aetrix Electronics and suitable for automotive interior lighting, LED video signage, industrial control panels, and white goods display modules requiring stable component supply, long-lifecycle support, and guaranteed traceability.
Supply support for TLC5927IDWR 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 high-reliability LED driver design.
The TLC592x product line was engineered specifically for LED display and lighting systems demanding precision current regulation, comprehensive fault detection, and daisy-chain scalability - targeting signage, automotive, and industrial applications.
FAQ
What is the key functional difference between TLC5927IDWR and TLC5926IDWR?
The TLC5927IDWR includes short-circuit detection - a feature absent in TLC5926IDWR - using VOUT threshold comparison (2.4–3.1 V trigger, 2.2 V return). Both share identical pinout, current range (5–120 mA), 30 MHz clock, and open-load/thermal detection. This makes TLC5927IDWR uniquely suitable for automotive and safety-critical wiring environments where short faults must be actively monitored.
How does the TLC5927IDWR report open-load and short-circuit faults?
The TLC5927IDWR reports both open-load and short-circuit faults via a 16-bit error status code shifted out on SDO in Special Mode. Each bit corresponds to one output channel (OUT0–OUT15); '0' indicates fault (open or short), '1' indicates normal operation. The status is latched and retained until Normal Mode resumes - enabling reliable post-fault diagnostics without host MCU polling overhead.
Can the TLC5927IDWR drive LEDs with forward voltages above 5.5 V?
Yes - the TLC5927IDWR output stage supports up to 17 V (VLED), independent of its 3.0–5.5 V VDD logic supply. This allows direct driving of high-VF LED strings (e.g., 5–6 white LEDs in series) without external boost circuitry. The constant-current regulation remains stable across 0.6–17 V output voltage range, with < ±0.1%/V output current variation.
What is the purpose of the R-EXT pin on the TLC5927IDWR?
The R-EXT pin on the TLC5927IDWR connects to an external resistor that sets the base output current for all 16 channels. With R-EXT = 720 Ω, typical output is 26 mA; with 360 Ω, it rises to 52 mA. Current scales inversely with resistance, enabling precise luminance control and batch calibration. Tolerance of R-EXT directly impacts overall current accuracy - 1% resistor recommended for < ±1% total error.
Does the TLC5927IDWR support daisy-chaining with other TLC5927IDWR devices?
Yes - the TLC5927IDWR supports unlimited daisy-chaining via SDI-to-SDO interconnection. Serial data enters SDI, shifts through the 16-bit register, and exits SDO to the next device's SDI. In Special Mode, the 16-bit error status or configuration code is similarly shifted out, enabling centralized fault monitoring across dozens of devices with minimal MCU GPIO usage.
TLC5927IDWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Linear
- Topology:
- Shift Register
- Internal Switch(s):
- -
- Number of Outputs:
- 16
- Voltage - Supply (Min):
- 3V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 17V
- Current - Output / Channel:
- 120mA
- Frequency:
- 30MHz
- Dimming:
- -
- Applications:
- Signage
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SOIC
TLC5927IDWR FAQ
1.How can I place an order for TLC5927IDWR through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC5927IDWR 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 TLC5927IDWR reliable?
The price and inventory of TLC5927IDWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC5927IDWR is usually 5 days.
3.What payment methods are accepted for TLC5927IDWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC5927IDWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC5927IDWR?
TLC5927IDWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC5927IDWR 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 TLC5927IDWR?
For technical support, including TLC5927IDWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC5927IDWR requirements.
6.How does Aetrix verify that TLC5927IDWR is sourced from the original manufacturer or authorized distributors?
All TLC5927IDWR 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 TLC5927IDWR meets industry standards.
7.What is the process for return or replacement of TLC5927IDWR?
All TLC5927IDWR units undergo pre-shipment inspection (PSI). If there is an issue with TLC5927IDWR, 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 TLC5927IDWR part is unused and in its original packaging.
Return procedure for TLC5927IDWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLC5927IDWR Tags
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