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Texas Instruments TLC5920DLR
- Part No.:
- TLC5920DLR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 48-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
TLC5920DLR.pdf
- Description:
- IC LED DRIVER LINEAR 30MA 48SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,292
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Product details
Overview
TLC5920DLR from Texas Instruments is a 16-channel × 8-bit constant-current LED driver/controller IC with integrated shift register, data latch, and common-driver decoder. It delivers up to 30 mA per segment output (16 channels) and 640 mA per common output (8 channels), supports 10 MHz serial clocking, operates from 4.5 V to 5.5 V logic/LED supplies, and drives cathode-common LED matrices in static or multiplexed configurations - used in industrial panel displays and dot-matrix signage.
For engineers reviewing the TLC5920DLR datasheet, TLC5920DLR pinout, TLC5920DLR application, or TLC5920DLR equivalent, key selection criteria include its 48-pin SSOP package, external IREF current-setting resistor, BLANK/DSEL blanking control, CSEL-based common-driver selection, and compatibility with cascaded multi-color LED arrays requiring precise per-bit current matching.
Technical Context
The TLC5920DLR integrates a 16-bit serial-in/parallel-out shift register synchronized to SCLK, followed by a 16-bit data latch triggered by LATCH, enabling stable segment data hold during common-driver switching. Its internal 3-to-8 decoder selects one of eight COM outputs based on CSEL0–CSEL2 inputs, while BLANK forces all common drivers low for global LED off.
Constant-current regulation uses an external resistor at IREF to set uniform segment current across all 16 outputs (±6% max channel-to-channel error), with analog supply VANA tied to VLED. The device supports daisy-chained operation via SIN/SOUT and provides DSEL output for display synchronization in multi-device systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Segment Output Current | 3 mA to 30 mA per channel, set by external IREF resistor - enables brightness tuning without PWM |
| Common Output Current | 640 mA max per COM pin (COM0–COM7) - supports high-brightness multiplexed LED rows |
| Current Accuracy | ±6% max mismatch between segment outputs - ensures uniform LED intensity across 16-bit display columns |
| Serial Clock Frequency | 10 MHz max - allows fast refresh rates for flicker-free 8×16 or 16×16 LED matrices |
| Supply Voltages | VLOG = VLED = VANA = 4.5 V to 5.5 V - single-rail 5 V system compatibility with isolated analog/digital grounds |
| Operating Temperature | –20°C to +85°C - qualified for industrial indoor display environments |
| Package | 48-pin SSOP (DL) - surface-mount footprint with 0.5 mm pitch, JEDEC MO-118 compliant |
Pinout & Package
48-pin SSOP (DL) package with exposed thermal pad (not electrically connected); body dimensions 11.35 mm × 16.2 mm × 1.75 mm; moisture sensitivity level MSL-2 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BLANK (39) | Global blanking input | High-level assertion disables all common drivers - enables flicker-free frame blanking or emergency shutdown |
| COM0–COM7 (1–4, 44–47) | Common anode outputs | Drive LED rows in cathode-common matrix; each supports up to 640 mA with 0.9 V max saturation voltage |
| CSEL0–CSEL2 (35–38) | Common select address inputs | 3-bit binary code selects one active COM output - enables time-multiplexed row scanning |
| DSEL (30, 33) | Display select I/O | Input disables all segments when high; output mirrors inverted DSEL state - synchronizes cascaded devices |
| IREF (17) | Current reference input | Connects external resistor to GNDANA to set segment current - determines full-scale brightness and power dissipation |
| LATCH (41) | Data latch strobe | Transfers shift register contents to output latches on rising edge - decouples data loading from display update timing |
| SIN (42) | Serial data input | Accepts 16-bit display data synchronized to SCLK rising edge - supports daisy-chain configuration |
| SOUT (32) | Serial data output | Shifts out latched data on next SCLK cycle - enables multi-TLC5920DLR cascading without external logic |
| S0–S15 (9–16, 22–29) | Segment current outputs | 16 constant-current sinks driving LED cathodes - each rated 30 mA max with ±6% matching |
| VLED (8, 18, 31) | LED power supply | Supplies common-anode LED rows; must be same as VANA and ≥ Vf of driven LEDs |
| VLOG (34) | Logic power supply | Powers digital circuitry (shift register, decoder, latch); separate from VLED to reduce noise coupling |
| GNDLED (5, 43, 48) | LED ground | Return path for segment current outputs - requires low-impedance connection to minimize voltage drop |
| GNDLOG (37) | Logic ground | Return path for digital I/O and internal logic - isolate from GNDLED to prevent ground bounce |
| GNDANA (21) | Analog ground | Reference for IREF current setting and analog circuitry - tie to GNDLED at single point near IREF |
| VANA (19) | Analog power supply | Bias for current-regulation circuitry; must equal VLED per datasheet requirement |
| SCLK (40) | Serial clock input | Drives synchronous data transfer; 10 MHz max frequency defines maximum display update bandwidth |
Key Features
| Feature | Design Value |
|---|---|
| 16-bit constant-current sink outputs | Delivers matched 3–30 mA per segment without external current-limiting resistors - reduces BOM count and PCB area |
| Integrated 3-to-8 common driver decoder | Eliminates need for external decoding logic when driving 8-row LED matrices - simplifies timing-critical row selection |
| Serial daisy-chain capability (SIN/SOUT) | Enables expansion to larger displays using multiple TLC5920DLR devices with single controller interface - no additional GPIO required |
| Independent BLANK and DSEL blanking controls | Allows both global (BLANK) and per-device (DSEL) blanking - supports synchronized multi-display systems with variable duty cycles |
| Single-resistor current programming (IREF) | Ensures identical brightness scaling across all 16 segments with one precision resistor - avoids per-channel calibration |
Applications
| Industrial Panel Displays | Dot-Matrix Signage |
|---|---|
Use Scenario: Driving 16×8 alphanumeric LED modules in factory HMIs with ambient temperature up to 85°C. IC Role / Device Role / Timing Role: Segment driver (S0–S15) and row selector (COM0–COM7) providing constant-current column sinking and time-multiplexed row sourcing. Use Value: ±6% current matching ensures uniform character brightness; 640 mA COM drive supports high-efficiency red/green LEDs at 1/8 duty cycle. | Use Scenario: Controlling 16×16 dual-color (red/green) LED matrix in outdoor advertising signs with cascaded architecture. IC Role / Device Role / Timing Role: One TLC5920DLR drives red rows/columns, another drives green - coordinated via shared SCLK/LATCH and DSEL handshaking. Use Value: Serial daisy-chaining reduces microcontroller pin count; BLANK synchronization prevents inter-frame ghosting during color transitions. |
| Test Equipment Indicators | Instrumentation Front Panels |
Use Scenario: Illuminating status LEDs and segmented bar graphs on benchtop power supplies and oscilloscopes. IC Role / Device Role / Timing Role: Static drive mode (1/1 duty) for indicator LEDs using all 16 segments simultaneously with individual COM pins disabled. Use Value: 30 mA per segment enables direct drive of high-brightness indicators without external transistors; VLOG/VLED separation minimizes digital noise coupling into analog sections. | Use Scenario: Backlighting 7-segment numeric displays and function-key LEDs on medical device front panels. IC Role / Device Role / Timing Role: Time-multiplexed 1/8 scan driving of 8-digit, 7-segment displays using COM0–COM7 as digit commons and S0–S6 as segment sinks. Use Value: Integrated decoder eliminates external 74HC138; IREF resistor allows factory-set brightness calibration traceable to single component. |
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 PWM + current sink (12-bit grayscale), 125 MHz internal clock, requires external DC-DC for VCC | Supports high-fidelity grayscale via PWM rather than static/multiplexed current control | Select when >4096 brightness levels or video-rate updates are required; not drop-in due to different control protocol and higher pin count |
| MAX6966ATL+T | 16-channel constant-current sink (15 mA max), I²C interface, built-in thermal shutdown, 2.7–5.5 V supply | Uses I²C instead of SPI-like serial interface; lower drive strength but integrated fault protection | Select for space-constrained designs needing I²C simplicity and thermal safety; unsuitable for 30 mA/high-power LED loads |
Compared with TLC5920DLR, TLC5940PWPR offers superior grayscale resolution but demands more complex timing and power design, while MAX6966ATL+T simplifies system integration with I²C yet sacrifices drive strength and multiplexing flexibility - TLC5920DLR remains optimal for cost-sensitive, high-current, serial-cascadable LED matrix control.
Availability
TLC5920DLR is available at Aetrix Electronics and suitable for industrial panel displays, dot-matrix signage, test equipment indicators, and instrumentation front panels requiring stable component supply and long-term production continuity.
Supply support for TLC5920DLR 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 U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and silicon technology for industrial, automotive, and communications markets.
The TLC5920DLR belongs to TI's legacy LED driver product line designed for reliable, low-complexity control of multiplexed LED arrays in cost-sensitive industrial and commercial display applications.
FAQ
What is the maximum segment current supported by the TLC5920DLR?
The TLC5920DLR supports a maximum segment output current of 30 mA per channel (S0–S15). This value is set externally using a resistor connected between IREF and GNDANA, with typical configurations achieving 3–30 mA. Absolute maximum rating is 32 mA, but sustained operation above 30 mA violates recommended operating conditions and risks thermal overstress.
How does the TLC5920DLR handle multiplexed LED matrix driving?
The TLC5920DLR drives multiplexed LED matrices using its integrated 3-to-8 decoder and eight COM outputs (COM0–COM7). CSEL0–CSEL2 select one active common line per cycle, while the 16 segment outputs (S0–S15) sink current for that row. Combined with BLANK and LATCH control, this enables precise 1/8 or 1/16 duty-cycle scanning - as confirmed in the datasheet's Application Information section for 16×16 dual-color arrays.
Can multiple TLC5920DLR devices be cascaded, and how is it implemented?
Yes, multiple TLC5920DLR devices can be cascaded using the SIN/SOUT serial interface. Data written to the first device's SIN propagates through SOUT to the next device's SIN on subsequent SCLK cycles. The datasheet's Example 2 shows two TLC5920DLR units driving a 16×16 dual-color array, with shared SCLK, LATCH, and BLANK signals - enabling scalable display expansion without additional controller resources.
What is the role of the IREF pin on the TLC5920DLR, and how is current set?
The IREF pin on the TLC5920DLR sets the reference current for all 16 segment outputs. A resistor (RIREF) is connected between IREF and GNDANA, establishing a reference voltage that scales the internal current mirror. For example, RIREF = 630 Ω yields ~20 mA per segment at VLED = 5 V. The relationship is linear and documented in the Electrical Characteristics table under IOH(S20) parameter.
Does the TLC5920DLR require separate analog and logic power supplies?
Yes, the TLC5920DLR requires three distinct supply connections: VLOG (logic), VLED (LED anode power), and VANA (analog bias). Per the datasheet, VANA must equal VLED, and all three supplies operate within 4.5 V to 5.5 V. Separating VLOG and GNDLOG from VLED/GNDLED reduces digital switching noise coupling into the precision current-regulation circuitry - critical for maintaining ±6% current matching.
TLC5920DLR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 48-BSSOP (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):
- 4.5V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- -
- Current - Output / Channel:
- 30mA
- Frequency:
- 10MHz
- Dimming:
- -
- Applications:
- -
- Operating Temperature:
- -20°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-SSOP
TLC5920DLR FAQ
1.How can I place an order for TLC5920DLR through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC5920DLR 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 TLC5920DLR reliable?
The price and inventory of TLC5920DLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC5920DLR is usually 5 days.
3.What payment methods are accepted for TLC5920DLR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC5920DLR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC5920DLR?
TLC5920DLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC5920DLR 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 TLC5920DLR?
For technical support, including TLC5920DLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC5920DLR requirements.
6.How does Aetrix verify that TLC5920DLR is sourced from the original manufacturer or authorized distributors?
All TLC5920DLR 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 TLC5920DLR meets industry standards.
7.What is the process for return or replacement of TLC5920DLR?
All TLC5920DLR units undergo pre-shipment inspection (PSI). If there is an issue with TLC5920DLR, 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 TLC5920DLR part is unused and in its original packaging.
Return procedure for TLC5920DLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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