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Texas Instruments TLC5927IDBQR
- Part No.:
- TLC5927IDBQR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
TLC5927IDBQR.pdf
- Description:
- IC LED DRVR LINEAR 120MA 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,990
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Product details
Overview
TLC5927IDBQR 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 (adjustable via R-EXT), supports 3.0–5.5 V logic supply, tolerates up to 17 V at output pins, and integrates open-load, shorted-load (TLC5927 only), and overtemperature detection. It is used in LED signage panels where uniform brightness and fault monitoring are critical.
For engineers reviewing the TLC5927IDBQR datasheet, TLC5927IDBQR pinout, TLC5927IDBQR application, or TLC5927IDBQR equivalent, this page provides verified functional context, validated pin roles, confirmed error-detection behavior, real-world timing constraints (30 MHz max clock), and accurate alternative part comparisons - all grounded in TI's SLVS677C specification.
Technical Context
The TLC5927IDBQR implements a 16-bit serial-in/parallel-out shift register with independent output latches, enabling daisy-chain configuration. Its output stage uses regulated current sinks with thermal shutdown and per-channel overtemperature sensing. The device operates in two modes: Normal mode for LED driving and Special mode for reading 16-bit error status codes or loading 8-bit global current gain configuration.
Unlike the TLC5926, the TLC5927IDBQR adds short-circuit detection using dual voltage thresholds (VOUT,TTh = 2.4–3.1 V, VOUT,RTh = 2.2 V) on active channels. Its error detection requires OE(ED2) and LE(ED1) pulse sequencing to enter Special mode, and error bits persist until mode reset - not cleared by cooling alone.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output channels | 16 constant-current sink outputs (OUT0–OUT15), each independently controllable |
| Output current range | 5 mA to 120 mA per channel, set externally via R-EXT resistor |
| Current accuracy | < ±6% between channels and between ICs (at 10–50 mA), enabling consistent LED brightness |
| Supply voltage | 3.0 V to 5.5 V logic supply (VDD); output pins tolerate up to 17 V (VO) |
| Max clock frequency | 30 MHz - supports high-speed data streaming for large LED matrices |
| Error detection | Open-load, shorted-load (TLC5927 only), and global/channel-specific overtemperature detection |
| Interface | Serial SPI-compatible interface with SDO feedback; Schmitt-trigger inputs for noise immunity |
Pinout & Package
Package: SSOP-24 (DBQ), body size 8.65 mm × 3.90 mm, exposed thermal pad (to be tied to GND).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Common return for logic and current-sink paths; connects to thermal pad |
| SDI (Pin 2) | Serial data input | Accepts 3.3 V/5 V logic-level serial data for shift register loading |
| CLK (Pin 3) | Shift clock input | Rising-edge triggered; controls data propagation through 16-bit shift register |
| LE(ED1) (Pin 4) | Latch enable / Error detect control | Latches shift register to output latch in Normal mode; initiates Special mode entry and configures current gain |
| OUT0–OUT15 (Pins 5–20) | Constant-current sink outputs | Each drives one LED cathode; sinks up to 120 mA with <±6% matching |
| R-EXT (Pin 23) | Current-setting reference | Connects external resistor to set full-scale output current (IOUT = 12.5 V / R-EXT) |
| SDO (Pin 22) | Serial data output | Outputs shifted data (Normal mode) or 16-bit error status code (Special mode) |
| OE(ED2) (Pin 21) | Output enable / Error detect control | Active-low enables outputs; short pulse triggers Special mode entry |
| VDD (Pin 24) | Logic supply input | Powers internal logic and shift register; must be 3.0–5.5 V |
Key Features
| Feature | Design Value |
|---|---|
| 256-step programmable global current gain | Adjusts output current from 1/12 to 127/128 in fine steps - enables white balancing in RGB LED panels |
| Short-circuit detection (TLC5927 only) | Dual-threshold voltage comparison (2.4–3.1 V trip, 2.2 V reset) on active channels - distinguishes shorted LEDs from normal low-VF operation |
| Open-load detection | Compares actual output current against 0.5% × target current threshold - detects open LED strings without external circuitry |
| Channel-specific overtemperature shutdown | Independent thermal sensor per output channel shuts down only affected channel - preserves partial system operation during local overheating |
| Global overtemperature protection | Shuts down all 16 outputs when junction temperature exceeds ~170°C - prevents catastrophic failure under sustained overload |
Applications
| LED Signage Panels | Automotive Exterior Lighting |
|---|---|
Use Scenario: Outdoor full-color LED message boards requiring long-term brightness consistency and fault reporting. IC Role / Device Role / Timing Role: Constant-current sink driver with integrated open/short detection and thermal monitoring for each LED segment. Use Value: Eliminates need for external current-setting resistors per channel and enables real-time LED string health reporting via SDO error code readback. |
Use Scenario: Tail lamp assemblies with mixed red/amber/white LEDs subject to vibration, thermal cycling, and EMI. IC Role / Device Role / Timing Role: Fault-tolerant LED driver with short-circuit detection and channel-specific thermal shutdown. Use Value: Detects shorted LED filaments before fuse blow, maintains partial lamp function during localized overheating, and meets automotive AEC-Q100 ambient temperature requirements. |
| Industrial Control Panel Displays | White Goods Status Indicators |
Use Scenario: Factory HMIs with high-density monochrome LED arrays operating continuously in warm enclosures. IC Role / Device Role / Timing Role: High-accuracy current sink with global + per-channel thermal protection and 30 MHz update rate. Use Value: Ensures stable LED intensity across temperature drift and prevents thermal runaway in sealed metal cabinets. |
Use Scenario: Refrigerator/freezer control panels where LEDs operate near condensation-prone zones and require low-power standby states. IC Role / Device Role / Timing Role: Low-quiescent-current LED driver with programmable current scaling and open-load detection for predictive maintenance. Use Value: Reduces standby power via OE(ED2) blanking and flags failed LEDs before user-visible dimming occurs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED sink driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC5926IDBQR | No short-circuit detection; identical pinout, package, and current range | Suitable where only open-load and thermal faults matter (e.g., indoor signage) | Select when short-circuit detection is unnecessary and cost optimization is prioritized |
| MAX7219CWG+ | 8-channel, integrated SPI interface, no short/open detection; includes scan-limiting and brightness control | Better suited for 7-segment/matrix displays with built-in decoding, not high-current LED strings | Choose for simpler 8×8 LED matrix control with on-chip digit decoding - not for 16-channel constant-current LED loads |
Compared with TLC5926IDBQR, the TLC5927IDBQR adds short-circuit detection at identical cost and footprint - making it preferable for safety-critical or outdoor LED systems. Versus MAX7219CWG+, the TLC5927IDBQR offers double the channel count, higher current capability (120 mA vs 40 mA), and true constant-current regulation - but lacks native digit decoding.
Availability
TLC5927IDBQR is available at Aetrix Electronics and suitable for LED signage, automotive exterior lighting, and industrial HMI applications requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for TLC5927IDBQR 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 experience in high-reliability industrial and automotive IC design.
The TLC5927IDBQR belongs to TI's TLC592x constant-current LED driver family, engineered specifically for fault-aware LED display and lighting systems demanding precision current matching, thermal resilience, and real-time diagnostics.
FAQ
What is the maximum output voltage tolerance for TLC5927IDBQR?
The TLC5927IDBQR output pins (OUT0–OUT15) tolerate up to 17 V, allowing direct connection to high-VF LED strings or operation in systems with elevated rail voltages. This rating is absolute - not dependent on current level - and applies across the full –40°C to +125°C operating temperature range. Exceeding 17 V risks permanent damage to the internal current-regulator transistors.
How does short-circuit detection work on TLC5927IDBQR?
The TLC5927IDBQR monitors output voltage on active channels: if VOUT rises above 2.4–3.1 V (trip threshold), it registers a short-circuit condition; if VOUT falls below 2.2 V (return threshold), the error bit clears. This dual-threshold hysteresis prevents false triggering during transient low-VF events. Detection is disabled on off-channels and requires Special Mode activation to read the 16-bit error status via SDO.
Can TLC5927IDBQR drive LEDs with different forward voltages in the same design?
Yes - the TLC5927IDBQR's constant-current architecture maintains 5–120 mA per channel regardless of forward voltage variation (within its 0–17 V output compliance range). This allows mixing red (1.8 V), green (3.2 V), and blue (3.4 V) LEDs on the same IC without current mismatch. Output current accuracy remains <±6% across VF differences, ensuring uniform luminance.
What is the role of R-EXT in TLC5927IDBQR operation?
R-EXT sets the full-scale output current for all 16 channels using the formula IOUT = 12.5 V / R-EXT. For example, a 720 Ω resistor yields ~17.4 mA per channel. The value directly determines current magnitude - lower resistance increases current, higher resistance reduces it. R-EXT must be connected between Pin 23 (R-EXT) and GND; leaving it open disables output current.
Does TLC5927IDBQR support daisy-chaining for multi-IC LED systems?
Yes - the TLC5927IDBQR supports seamless daisy-chaining via SDI-to-SDO interconnection. Serial data enters SDI, shifts through the 16-bit register, and exits SDO to the next IC's SDI. With 30 MHz max clock speed and minimal propagation delay (27–95 ns), up to 10+ devices can be cascaded while maintaining reliable timing margins and synchronized latch behavior across the chain.
TLC5927IDBQR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-SSOP (0.154", 3.90mm 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-SSOP
TLC5927IDBQR FAQ
1.How can I place an order for TLC5927IDBQR through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC5927IDBQR 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 TLC5927IDBQR reliable?
The price and inventory of TLC5927IDBQR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC5927IDBQR is usually 5 days.
3.What payment methods are accepted for TLC5927IDBQR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC5927IDBQR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC5927IDBQR?
TLC5927IDBQR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC5927IDBQR 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 TLC5927IDBQR?
For technical support, including TLC5927IDBQR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC5927IDBQR requirements.
6.How does Aetrix verify that TLC5927IDBQR is sourced from the original manufacturer or authorized distributors?
All TLC5927IDBQR 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 TLC5927IDBQR meets industry standards.
7.What is the process for return or replacement of TLC5927IDBQR?
All TLC5927IDBQR units undergo pre-shipment inspection (PSI). If there is an issue with TLC5927IDBQR, 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 TLC5927IDBQR part is unused and in its original packaging.
Return procedure for TLC5927IDBQR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLC5927IDBQR Tags
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