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Texas Instruments TLC5917QDRQ1
- Part No.:
- TLC5917QDRQ1
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TLC5917QDRQ1.pdf
- Description:
- IC LED DRVR LINEAR 120MA 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,492
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Product details
Overview
TLC5917QDRQ1 from Texas Instruments is an AEC-Q100 Grade 1 qualified 8-channel constant-current LED sink driver for automotive lighting and display 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/short-load/overtemperature detection, and operates with up to 30 MHz serial clock for cascaded LED string control in headlamp modules and dashboard displays.
For engineers reviewing the TLC5917QDRQ1 datasheet, TLC5917QDRQ1 pinout, TLC5917QDRQ1 application, or TLC5917QDRQ1 equivalent, this page provides verified functional context, validated pin roles, confirmed error-detection behavior (including short-circuit detection unique to TLC5917-Q1), real-world current accuracy specs (<±3% between channels), and automotive-grade thermal shutdown thresholds (150–200°C).
Technical Context
The TLC5917QDRQ1 integrates an 8-bit shift register, independent output latches, and eight regulated current sinks with per-channel overtemperature sensing. Its dual-mode operation-Normal Mode for LED control and Special Mode for error status readback or 256-step global current gain adjustment-relies on timed pulses on OE(ED2) and LE(ED1) pins.
Unlike TLC5916-Q1, TLC5917QDRQ1 adds short-circuit detection using voltage thresholds (VOUT,TTh = 2.44–3.1 V; VOUT,RTh = 2.2 V) on each output, enabling fault isolation in multi-LED strings. All outputs tolerate up to 17 V, supporting single or stacked LEDs per channel without external current-limiting resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Channels | 8 independent constant-current sink outputs (OUT0–OUT7) |
| Output Current Range | 5 mA to 120 mA per channel, set by single R-EXT resistor |
| Current Accuracy | < ±3% max mismatch between channels; < ±6% max mismatch between ICs |
| Supply Voltage | 3.0 V to 5.5 V logic supply (VDD); outputs support up to 17 V (VLED) |
| Error Detection | Open-load, short-load (TLC5917-Q1 only), and per-channel + global overtemperature detection |
| Serial Interface | 30 MHz max CLK frequency; Schmitt-trigger inputs; SDO enables daisy-chained readback |
| Automotive Qualification | AEC-Q100 Grade 1 (–40°C to +125°C ambient), HBM ±1500 V, CDM ±1000 V |
Pinout & Package
Package: SOIC-16 (9.90 mm × 3.91 mm), RoHS-compliant, moisture-sensitive level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Ground reference | Common return for logic and current-sink paths; must be low-impedance for stable current regulation |
| SDI | Serial data input | Accepts 3.3 V/5 V logic-level data; feeds 8-bit shift register on CLK rising edge |
| CLK | Clock input | Rising-edge triggered; controls data shift rate (up to 30 MHz); timing-critical for cascade reliability |
| LE(ED1) | Latch enable / mode control | Latches shift register to output latch in Normal Mode; selects Error Detection or Current Gain mode in Special Mode |
| OE(ED2) | Output enable / mode trigger | Active-low output driver control; one-clock pulse initiates transition to Special Mode |
| R-EXT | Current-setting input | Connects external resistor to set all 8 output currents simultaneously; tolerance directly impacts absolute current accuracy |
| SDO | Serial data output | Drives next device's SDI or host MCU; outputs error status code or configuration data in Special Mode |
| OUT0–OUT7 | Constant-current sinks | Each independently controlled; sink up to 120 mA; withstand 17 V; support open/short/thermal fault reporting |
| VDD | Logic supply | Powers internal logic and shift register; decoupling capacitor required near pin |
| VLED | LED anode supply | High-side LED supply rail; not internally generated-must be provided externally (up to 17 V) |
Key Features
| Feature | Design Value |
|---|---|
| Short-circuit detection | Exclusive to TLC5917-Q1; uses dual voltage thresholds (2.44–3.1 V trigger, 2.2 V return) per channel to identify LED shorts without false triggers from VF variation |
| 256-step current gain | Runtime-programmable global gain (1/12 to 127/128) compensates inter-IC current mismatch to <1%, enabling precise white balancing in RGB LED panels |
| Dual functional modes | Normal Mode for LED driving; Special Mode for non-intrusive error status readback or gain reconfiguration-no system reset required |
| Per-channel thermal protection | Independent shutdown of only overheated outputs preserves functionality of remaining channels during localized thermal stress (e.g., adjacent high-power LEDs) |
| Open-load detection with dynamic threshold | Threshold scales to target current (IOUT,Th = 0.5 × IOUT,target), ensuring reliable open-wire detection across full 5–120 mA range |
Applications
| Automotive Headlamp Control | Dashboard LED Display |
|---|---|
Use Scenario: Driving adaptive front-lighting system (AFS) LED arrays with individual beam-shaping segments. IC Role / Device Role / Timing Role: Constant-current sink for 8 independent LED zones; short-circuit detection prevents single-LED failure from disabling entire headlamp module. Use Value: Enables fail-operational design per ISO 26262 ASIL-B requirements by isolating faults per channel and maintaining partial illumination. | Use Scenario: Controlling segmented backlight and indicator LEDs in instrument clusters with varying brightness levels. IC Role / Device Role / Timing Role: Serially driven 8-channel current sink; 256-step gain allows dynamic white-point calibration across temperature and aging. Use Value: Eliminates manual trim resistors and supports automated factory calibration for consistent color rendering over lifetime. |
| Interior Ambient Lighting | Gaming Machine LED Panels |
Use Scenario: Powering RGBW LED strips for mood lighting with synchronized dimming and fault monitoring. IC Role / Device Role / Timing Role: Cascadable sink driver with SDO-to-SDI chaining; open-load detection identifies broken LED strings in long linear runs. Use Value: Reduces diagnostic time by reporting exact faulty channel via serial readback instead of visual inspection. | Use Scenario: Driving high-brightness alphanumeric and icon displays in casino gaming cabinets exposed to wide ambient temperatures. IC Role / Device Role / Timing Role: AEC-Q100 qualified sink driver operating at –40°C to +125°C; overtemperature detection prevents thermal runaway in enclosed enclosures. Use Value: Guarantees uninterrupted operation in unventilated cabinets while meeting automotive-grade reliability standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar constant-current LED sink driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC5916QDRQ1 | Lacks short-circuit detection; identical pinout, current range, and error reporting for open-load/overtemperature | Suitable where LED short faults are mitigated by external design (e.g., fused strings) | Select when short-circuit detection is unnecessary and cost optimization is prioritized |
| MAX7219CWG+T | Integrated 8×8 LED matrix controller with SPI interface; no short/open detection; fixed 40 mA per segment | Targeted at multiplexed 7-segment or dot-matrix displays-not for direct constant-current string driving | Choose only for legacy 7-seg applications requiring minimal external components and no per-channel fault isolation |
Compared with TLC5916QDRQ1, TLC5917QDRQ1 adds critical short-circuit detection for safety-critical automotive lighting, while MAX7219CWG+T trades fault diagnostics for integrated display decoding-making it unsuitable for high-reliability LED string control where per-channel monitoring is required.
Availability
TLC5917QDRQ1 is available at Aetrix Electronics and suitable for automotive lighting systems, dashboard displays, interior ambient lighting, and gaming machine LED panels requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TLC5917QDRQ1 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 company specializing in analog and embedded processing solutions, with leadership in automotive-grade power management and signal chain products.
The TLC591x-Q1 product line was designed specifically for AEC-Q100-compliant LED lighting and display applications requiring robust fault detection, precise current matching, and seamless daisy-chain scalability in harsh environments.
FAQ
What distinguishes TLC5917QDRQ1 from TLC5916QDRQ1?
The TLC5917QDRQ1 includes short-circuit detection capability-using voltage thresholds (2.44–3.1 V trigger, 2.2 V return) on each output-which TLC5916QDRQ1 lacks. Both share identical pinout, 8-channel constant-current sinking (5–120 mA), open-load/overtemperature detection, and 30 MHz serial interface. This makes TLC5917QDRQ1 mandatory for automotive applications where LED short faults must be isolated without disabling adjacent channels.
How does the short-circuit detection work in TLC5917QDRQ1?
In TLC5917QDRQ1, short-circuit detection monitors output voltage (VOUT) against two thresholds: if VOUT exceeds 2.44–3.1 V (trigger), a short is flagged; if VOUT drops below 2.2 V (return), the fault clears. This hysteresis prevents chatter during transient conditions. Detection only activates when the channel is enabled (OE low and latch set), and the status is reported in the 8-bit error register readable via SDO in Special Mode.
Can TLC5917QDRQ1 drive multiple LEDs in series per channel?
No-TLC5917QDRQ1 is a constant-current *sink* driver with 17 V maximum output voltage rating (VLED). It supports multiple LEDs *in parallel* per channel (to increase total current), or a single LED per channel. For series strings requiring higher forward voltage, an external high-side switch or boost converter must supply VLED > sum(VF), as TLC5917QDRQ1 does not regulate or generate VLED.
What is the purpose of the R-EXT pin on TLC5917QDRQ1?
The R-EXT pin on TLC5917QDRQ1 connects to an external precision resistor that sets the reference current for all eight output channels. Output current is calculated as IOUT = 12.5 V / REXT, enabling adjustment from 5 mA (REXT = 2.5 kΩ) to 120 mA (REXT = 104 Ω). Resistor tolerance directly impacts absolute current accuracy, so 1% metal-film types are recommended for tight binning.
Does TLC5917QDRQ1 support daisy-chaining for larger LED arrays?
Yes-TLC5917QDRQ1 supports seamless daisy-chaining via SDI-to-SDO connection. Data shifts through the 8-bit shift register of each device in sequence, and SDO of one drives SDI of the next. The same CLK, LE(ED1), and OE(ED2) signals control the entire chain. Error status readback also propagates serially, allowing centralized fault diagnosis across dozens of devices with minimal GPIO usage.
TLC5917QDRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Linear
- Topology:
- Shift Register
- Internal Switch(s):
- Yes
- Number of Outputs:
- 8
- 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 ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
TLC5917QDRQ1 FAQ
1.How can I place an order for TLC5917QDRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC5917QDRQ1 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 TLC5917QDRQ1 reliable?
The price and inventory of TLC5917QDRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC5917QDRQ1 is usually 5 days.
3.What payment methods are accepted for TLC5917QDRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC5917QDRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC5917QDRQ1?
TLC5917QDRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC5917QDRQ1 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 TLC5917QDRQ1?
For technical support, including TLC5917QDRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC5917QDRQ1 requirements.
6.How does Aetrix verify that TLC5917QDRQ1 is sourced from the original manufacturer or authorized distributors?
All TLC5917QDRQ1 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 TLC5917QDRQ1 meets industry standards.
7.What is the process for return or replacement of TLC5917QDRQ1?
All TLC5917QDRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TLC5917QDRQ1, 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 TLC5917QDRQ1 part is unused and in its original packaging.
Return procedure for TLC5917QDRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLC5917QDRQ1 Tags
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BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
Infineon Technologies
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BCR420UE6327HTSA1
Infineon Technologies
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BCR421UE6327HTSA1
Infineon Technologies
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LYT1604D-TL
Power Integrations
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HV9910CLG-G
Microchip Technology
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CL2N8-G
Microchip Technology
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BCR420UW6-7
Diodes Incorporated
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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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