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Texas Instruments TLC59401RHBT
- Part No.:
- TLC59401RHBT
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
TLC59401RHBT.pdf
- Description:
- IC LED DRVR LINEAR 120MA 32VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:7,575
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Product details
Overview
TLC59401RHBT from Texas Instruments is a 16-channel constant-current LED driver IC with integrated 12-bit grayscale PWM control (4096 steps), 6-bit dot correction (64 steps), and LED open/thermal error detection. It supports up to 120 mA per channel (VCC > 3.6 V), operates from 3.0 V to 5.5 V, and drives LEDs with output voltage capability up to 17 V - used in full-color LED signage and high-precision display backlighting.
For engineers reviewing the TLC59401RHBT datasheet, TLC59401RHBT pinout, TLC59401RHBT application, or TLC59401RHBT equivalent, key selection criteria include its serial interface timing (30 MHz SCLK/GSCLK), IREF-based current programming, BLANK-controlled global output enable, and XERR open-drain error reporting for system-level fault monitoring.
Technical Context
The TLC59401RHBT implements dual-register architecture: a 192-bit grayscale (GS) register for per-channel 12-bit PWM brightness control and a 96-bit dot correction (DC) register for per-channel 6-bit current scaling. Grayscale counter operation is synchronized to GSCLK, while serial data loading is controlled by SCLK and latched via XLAT in mode-selectable 96-bit (DC) or 192-bit (GS) frames.
It integrates graduated 20 ns inter-channel output delays (0–300 ns across OUT0–OUT15) to suppress inrush current, features CMOS-level I/O compatibility, and uses an internal 1.24 V bandgap reference at IREF to set channel current via external resistor (Imax = 31.5 × VIREF/RIREF). Thermal error flag (TEF) triggers at ~160°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 16 independent constant-current sink outputs (OUT0–OUT15) |
| Grayscale resolution | 12-bit (4096-step) PWM control per channel - enables smooth brightness gradation in video-grade LED displays |
| Dot correction | 6-bit (64-step) per-channel current scaling - corrects LED-to-LED luminance variance without external calibration hardware |
| Max output current | 120 mA per channel (VCC > 3.6 V) - supports high-brightness LEDs with single-resistor programming via IREF |
| Output voltage range | –0.3 V to 18 V - accommodates common-anode LED strings up to 17 V forward voltage |
| Data rate | 30 MHz SCLK/GSCLK - enables fast frame updates for dynamic signage and real-time animation |
| Error detection | Integrated LED open detection (LOD) and thermal error flag (TEF), reported via open-drain XERR - reduces need for external fault monitoring circuitry |
Pinout & Package
32-pin 5 mm × 5 mm QFN package with exposed thermal pad (RHB suffix); RoHS-compliant, moisture-sensitive level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT0–OUT15 | Constant-current sink outputs | 16 individually programmable current sinks; each capable of 0–120 mA; voltage-tolerant to 18 V |
| IREF | Reference current input | Connects to GND via external resistor to set max channel current (Imax = 31.5 × 1.24 V / RIREF) |
| SIN / SOUT | Serial data input/output | Daisy-chain capable; SIN accepts 96- or 192-bit frames; SOUT outputs status/error bits during readback |
| SCLK / GSCLK | Serial clock / grayscale clock | SCLK shifts data; GSCLK clocks PWM counter - both support 30 MHz operation |
| XLAT | Latch control input | Level-triggered; rising edge not required - high state transfers shift register to GS or DC register based on MODE |
| BLANK | Global output disable | Active-high; forces all OUTn OFF and resets grayscale counter - enables flicker-free frame blanking |
| MODE | Operating mode select | GND = GS mode (192-bit); VCC = DC mode (96-bit) - determines shift register length and latch target |
| XERR | Open-drain error output | Asserts low on LOD or TEF; supports wired-OR of multiple devices with single pull-up resistor |
| TEST | Internal test enable | Must be tied to VCC for proper dot correction functionality - not optional in production |
Key Features
| Feature | Design Value |
|---|---|
| Graduated output delay | 20 ns step between adjacent channels (0–300 ns total) - limits simultaneous turn-on current surge and reduces PCB bypass capacitance requirements |
| Single-resistor current setting | One external RIREF sets all 16 channels' max current - eliminates per-channel trimming and simplifies BOM |
| Status register readback | LOD/TEF status bits accessible via SOUT after XLAT pulse - enables firmware-driven fault diagnosis without additional GPIO |
| CMOS-level I/O | VIL ≤ 0.2 VCC, VIH ≥ 0.8 VCC - ensures interoperability with 3.3 V and 5 V microcontrollers without level shifters |
| Thermal protection | Junction temperature threshold ~160°C (TEF activation) - prevents thermal runaway during sustained high-current operation |
Applications
| Monochrome LED Signage | Full-Color Video Walls |
|---|---|
Use Scenario: Outdoor alphanumeric message boards using discrete red/green/blue LED modules arranged in matrix arrays. IC Role / Device Role / Timing Role: TLC59401RHBT acts as per-pixel current driver, receiving serialized grayscale and dot correction data from FPGA controller; BLANK synchronizes frame updates. Use Value: 12-bit grayscale + 6-bit dot correction enables uniform brightness across 10,000+ pixels without manual binning; 120 mA drive supports high-lumen outdoor visibility. | Use Scenario: Indoor rental video walls with tight pixel pitch (≤2.5 mm), requiring precise color fidelity and minimal flicker. IC Role / Device Role / Timing Role: TLC59401RHBT serves as RGB subpixel driver per module; cascaded SOUT→SIN topology reduces controller pin count; GSCLK precisely times PWM cycles. Use Value: 30 MHz data rate supports 60 Hz refresh at 1920×1080 resolution; inter-channel delay minimizes EMI during rapid frame transitions. |
| Automotive Interior Lighting | Medical Display Backlighting |
Use Scenario: Dynamic ambient lighting in vehicle cabins, where LED intensity must adapt to ambient light and user profiles. IC Role / Device Role / Timing Role: TLC59401RHBT drives multi-zone LED strings under MCU control; XERR reports open-circuit faults for ASIL-B diagnostic coverage. Use Value: Integrated LOD detection satisfies automotive functional safety requirements; 3.0–5.5 V supply range matches vehicle battery transients. | Use Scenario: High-contrast diagnostic monitors requiring flicker-free, dimmable white LED backlights with stable color temperature. IC Role / Device Role / Timing Role: TLC59401RHBT controls parallel-connected white LED strings; dot correction compensates for LED aging drift over 50,000-hour lifetime. Use Value: 6-bit dot correction allows field recalibration without hardware change; thermal flag prevents backlight failure during prolonged imaging sessions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC5947RGER | 24-channel, same 12-bit GS/6-bit DC architecture, but adds auto-refresh and enhanced error reporting; requires different MODE logic and larger package (24-pin QFN) | Supports higher channel density per board area; lacks graduated output delay - may require larger input capacitance | Choose when expanding from 16 to 24 channels without redesigning control firmware interface |
| IS31FL3731-QFLS4-TR | 18-channel, I²C interface (not SPI), integrated oscillator, no external GSCLK needed; lower max current (40 mA) | Reduces external clock routing; unsuitable for high-current or high-speed (>1 kHz) PWM applications | Prefer for space-constrained consumer UIs where I²C simplifies host integration and power efficiency outweighs current capability |
Compared with TLC59401RHBT, TLC59407RGER offers higher channel count but removes inter-channel delay - increasing peak supply current - while IS31FL3731-QFLS4-TR trades off current drive and speed for I²C simplicity and integrated timing, making it better suited for low-power UIs than high-brightness signage.
Availability
TLC59401RHBT is available at Aetrix Electronics and suitable for full-color LED video walls, automotive interior lighting systems, and medical display backlighting requiring stable component supply across multi-year production cycles.
Supply support for TLC59401RHBT 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 specializing in analog, embedded processing, and high-reliability power management solutions.
The TLC59401RHBT belongs to TI's precision LED driver product line, designed specifically for high-fidelity, high-current LED display systems requiring per-pixel brightness uniformity and robust fault diagnostics.
FAQ
What is the maximum output current per channel for the TLC59401RHBT?
The TLC59401RHBT supports up to 120 mA per channel when VCC exceeds 3.6 V, set by an external resistor connected between IREF and GND. At VCC ≤ 3.6 V, the limit is 80 mA. The relationship is Imax = 31.5 × 1.24 V / RIREF, with RIREF selected to achieve the desired current within 5–120 mA range. This applies uniformly across all 16 OUTn pins of the TLC59401RHBT.
How does the TLC59401RHBT handle LED open-circuit detection?
The TLC59401RHBT detects open LEDs via its LED Open Detection (LOD) circuit, which monitors each OUTn pin voltage during active drive. If OUTn voltage falls below ~0.3 V while the channel is enabled, LOD asserts and pulls the open-drain XERR pin low. The corresponding LOD bit is latched into the status register on the falling edge of XLAT and can be read back via SOUT. This behavior is integral to the TLC59401RHBT's fault-reporting architecture.
Can the TLC59401RHBT be daisy-chained with other TLC59401RHBT devices?
Yes, the TLC59401RHBT supports serial daisy-chaining: connect SOUT of one device to SIN of the next, share SCLK, GSCLK, XLAT, BLANK, and MODE lines, and use individual IREF resistors per device. Cascaded operation preserves timing integrity - data propagates through the chain with predictable delay (td = 20–30 ns per stage). Up to 16 TLC59401RHBT units can be linked for 256-channel control using a single microcontroller interface.
What is the function of the TEST pin on the TLC59401RHBT?
The TEST pin on the TLC59401RHBT must be hard-wired to VCC in all operational configurations. It enables internal biasing for the dot correction circuitry; leaving TEST floating or grounded disables 6-bit dot correction functionality entirely, though grayscale PWM remains active. This requirement is explicitly documented in the TI datasheet SBVS137 and applies strictly to the TLC59401RHBT - no pull-up resistor or dynamic control is permitted.
Does the TLC59401RHBT require an external clock source for grayscale PWM operation?
Yes, the TLC59401RHBT requires an external grayscale clock (GSCLK) signal applied to its dedicated GSCLK pin. This clock directly drives the 12-bit PWM counter and determines the grayscale refresh frequency. GSCLK supports up to 30 MHz and must be provided by the host controller or oscillator circuit - the TLC59401RHBT contains no internal oscillator. All timing-critical functions, including PWM period and dot correction update synchronization, depend on this externally supplied GSCLK signal for the TLC59401RHBT.
TLC59401RHBT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 32-VFQFN Exposed Pad
- 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:
- 120mA
- Frequency:
- 30MHz
- Dimming:
- -
- Applications:
- Backlight, Signage
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-VQFN (5x5)
TLC59401RHBT FAQ
1.How can I place an order for TLC59401RHBT through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC59401RHBT 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 TLC59401RHBT reliable?
The price and inventory of TLC59401RHBT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC59401RHBT is usually 5 days.
3.What payment methods are accepted for TLC59401RHBT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC59401RHBT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC59401RHBT?
TLC59401RHBT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC59401RHBT 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 TLC59401RHBT?
For technical support, including TLC59401RHBT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC59401RHBT requirements.
6.How does Aetrix verify that TLC59401RHBT is sourced from the original manufacturer or authorized distributors?
All TLC59401RHBT 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 TLC59401RHBT meets industry standards.
7.What is the process for return or replacement of TLC59401RHBT?
All TLC59401RHBT units undergo pre-shipment inspection (PSI). If there is an issue with TLC59401RHBT, 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 TLC59401RHBT part is unused and in its original packaging.
Return procedure for TLC59401RHBT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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