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Texas Instruments TLC5970RHPR
- Part No.:
- TLC5970RHPR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 28-VQFN Exposed Pad
- Datasheet:
-
TLC5970RHPR.pdf
- Description:
- IC LED DRIVER RGLTR 150MA 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,442
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Product details
Overview
TLC5970RHPR from Texas Instruments is a 3-channel, 12-bit PWM LED driver IC with integrated buck DC/DC converter and differential signal interface. It delivers constant-current sink outputs up to 150 mA per channel, supports 4096-step grayscale control, 128-step dot correction, and 128-step global brightness control - enabling precise color-matched illumination in large-area static LED displays.
For engineers reviewing the TLC5970RHPR datasheet, TLC5970RHPR pinout, TLC5970RHPR application, or TLC5970RHPR equivalent, key selection considerations include its QFN-28 package, differential cascading capability (SDTY/SDTZ/SCKY/SCKZ), auto-refresh timing, EEPROM-based dot correction storage, and buck converter operation supporting up to 36 V input and 17 V LED supply voltage.
Technical Context
The TLC5970RHPR integrates a high-efficiency buck converter with PH/BOOT/FB pins to dynamically regulate LED anode voltage, minimizing power loss and enabling thinner wiring for long-distance installations. Its differential interface uses SDTA/SDTB and SCKA/SCKB inputs with SDTY/SDTZ/SCKY/SCKZ outputs, supporting 20 MHz data transfer and unlimited device cascading via DSI mode selection.
Each of the three output channels (OUT0–OUT2) features independent 7-bit dot correction (stored in internal EEPROM), 12-bit grayscale PWM generation, and 7-bit global brightness control - all accessible through the same differential serial interface. Thermal shutdown triggers at +138°C (pre-shutdown) and +150°C (full shutdown), with undervoltage lockout active below 3.8 V on VREG.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Channels | 3 independent constant-current sink outputs (OUT0–OUT2) |
| Max Sink Current | 150 mA per channel, set by external IREF resistor (1–15 kΩ) |
| Grayscale Resolution | 12-bit (4096 steps), PWM-based, internally generated clock |
| Differential Data Rate | 20 MHz max clock frequency on SCKA/SCKB, enabling fast cascaded updates |
| Buck Converter Input | 10–36 V VCC, supports auto LED anode voltage control up to 17 V at FB |
| Dot Correction Storage | Internal EEPROM stores 7-bit correction per channel (128 steps), nonvolatile |
| Thermal Protection | Pre-shutdown at +138°C, full thermal shutdown at +150°C, with 5–20°C hysteresis |
Pinout & Package
The TLC5970RHPR is housed in a thermally enhanced QFN-28 (6.0 mm × 6.0 mm) package with exposed thermal pad electrically connected to GND. The package requires soldering the thermal pad to PCB ground plane for optimal thermal performance and reliability under continuous 150 mA/channel load.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREG | Internal 5-V regulator output | Supplies core logic; requires 0.01 µF decoupling to GND; not loadable |
| VREGIF | Differential interface regulator | Provides clean 5-V bias for SDTY/SDTZ/SCKY/SCKZ drivers; needs 0.1 µF decoupling |
| IREF0–IREF2 | Current reference inputs | Set max sink current per channel via external resistor to GND (1–15 kΩ) |
| OUT0–OUT2 | Constant-current sink outputs | Drive LED cathodes; support parallel connection to increase current capability |
| SDTA/SDTB | Differential data input pair | Accepts LVDS-like serial data; common-mode range –7 V to +12 V |
| SCKA/SCKB | Differential clock input pair | 20 MHz max edge rate; synchronizes data shift into 40-bit common register |
| SDTY/SDTZ | Differential data output pair | Re-transmits received data downstream; enables daisy-chain topology |
| SCKY/SCKZ | Differential clock output pair | Re-drives clock for next device; maintains timing integrity across long chains |
| FB | Buck converter feedback | Connects to LED anode node; regulates output to maintain ~1 V headroom at OUTn |
| PH/BOOT | High-side MOSFET gate drive | PH drives external inductor/diode; BOOT supplies gate charge via capacitor to PH |
| SWOFF | Buck enable/disable control | Pulled down internally; tie to VREG to disable buck, use GND to enable |
| VROM | EEPROM programming voltage | Apply 19 V for dot correction write; open during normal operation |
| GND/VCC | Power ground and supply | VCC accepts 10–36 V; thermal pad must be connected to GND |
Key Features
| Feature | Design Value |
|---|---|
| Unlimited daisy-chaining | SDTY/SDTZ/SCKY/SCKZ outputs allow seamless expansion without additional controllers |
| Auto-display repeat | Internal oscillator (8–12 MHz) enables autonomous refresh without host timing intervention |
| Dot correction EEPROM | Nonvolatile 7-bit per-channel correction eliminates manual calibration drift over time |
| LED supply optimization | Buck converter dynamically adjusts FB voltage to maintain minimal 1 V OUT-to-FB drop, maximizing efficiency |
| Differential noise immunity | ±12 V common-mode input range and 30–110 mV hysteresis reject EMI in industrial environments |
Applications
| Architectural LED Facades | Outdoor Digital Billboards |
|---|---|
Use Scenario: Large-scale building exteriors with thousands of RGB LEDs requiring uniform brightness and color fidelity across multi-story installations. IC Role / Device Role / Timing Role: TLC5970RHPR acts as channel-specific current sink and grayscale controller, synchronized via differential cascade to eliminate clock skew across 100+ devices. Use Value: Dot correction compensates for LED binning variance; buck regulation reduces wiring losses over 20+ meter runs; EEPROM retains calibration after power cycles. | Use Scenario: High-brightness outdoor signage exposed to wide temperature swings and EMI from adjacent power systems. IC Role / Device Role / Timing Role: TLC5970RHPR provides thermally robust constant-current drive with pre-shutdown warning (+138°C) and differential interface resilience against conducted noise. Use Value: 20 MHz differential signaling ensures reliable data delivery in noisy environments; thermal shutdown prevents catastrophic failure during summer ambient peaks. |
| Stage Lighting Arrays | Transportation Signage |
Use Scenario: Dynamic theatrical lighting rigs requiring rapid, flicker-free intensity transitions and precise white-point tuning across mixed-color LEDs. IC Role / Device Role / Timing Role: TLC5970RHPR delivers 12-bit grayscale resolution and independent channel current control to achieve smooth dimming curves and accurate RGB mixing. Use Value: 4096-step PWM eliminates visible stepping; global brightness control allows scene-level intensity scaling without reprogramming individual channels. | Use Scenario: Bus/train destination displays operating continuously in vibration-prone, wide-temperature environments with strict power budget constraints. IC Role / Device Role / Timing Role: TLC5970RHPR serves as integrated LED driver and power converter, reducing BOM count by eliminating external DC/DC and current-setting components. Use Value: Single-chip solution cuts board space and assembly cost; buck efficiency >90% extends battery life or reduces heat sink requirements in enclosed housings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC5940RHBR | No integrated buck converter; requires external 5-V supply; 16-channel, 12-bit, but no dot correction EEPROM | Better suited for low-voltage, high-channel-count PCBs where board space permits discrete DC/DC | Select when cascading >16 channels per controller and buck conversion is handled centrally |
| AL8863SP-13 | Single-channel buck LED driver with analog dimming only; no PWM, no differential interface, no EEPROM | Targeted at simple monochrome indicators or backlighting with basic brightness control | Choose only for cost-sensitive, single-output designs lacking grayscale or cascade requirements |
Compared with TLC5940RHBR and AL8863SP-13, the TLC5970RHPR uniquely combines integrated buck conversion, differential cascading, and nonvolatile dot correction - making it the only option among the three capable of maintaining color accuracy across large-scale, long-distance, self-calibrating LED arrays without external timing or power management circuitry.
Availability
TLC5970RHPR is available at Aetrix Electronics and suitable for architectural LED facades, outdoor digital billboards, and stage lighting arrays requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for TLC5970RHPR 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 over 90 years of innovation in high-reliability industrial and automotive solutions.
The TLC5970RHPR belongs to TI's high-performance LED driver product line, designed specifically for demanding static LED display applications requiring precision current matching, noise-immune communication, and autonomous operation in harsh environments.
FAQ
What is the maximum input voltage supported by the TLC5970RHPR buck converter?
The TLC5970RHPR buck converter accepts a VCC input voltage range of 10 V to 36 V, with absolute maximum rating at +40 V. Operation above 36 V risks exceeding safe operating area limits and may trigger overvoltage protection. The FB pin regulates LED supply up to 17 V, ensuring optimal headroom for the 150 mA sink outputs while maintaining efficiency.
How does the TLC5970RHPR achieve uniform brightness across multiple LED strings?
The TLC5970RHPR achieves uniform brightness using three mechanisms: (1) channel-to-channel constant-current accuracy of ±0.5% (typ), (2) 7-bit per-channel dot correction stored in internal EEPROM to compensate for LED forward-voltage variation, and (3) 128-step global brightness control that scales all channels simultaneously without altering relative ratios. These features collectively minimize luminance deviation across large arrays.
Can the TLC5970RHPR operate without the buck converter enabled?
Yes, the TLC5970RHPR can operate in "no buck converter" mode by connecting SWOFF to VREG. In this configuration, the internal buck circuit is disabled, OUT0–OUT2 function as pure constant-current sinks referenced to VCC, and FB must be externally biased within 7–17 V. This mode is used when external LED power is already regulated or when driving low-voltage LED strings directly from VCC.
What is the purpose of the VROM pin on the TLC5970RHPR?
The VROM pin on the TLC5970RHPR is dedicated to EEPROM programming: applying 19 V (±0.5 V) to VROM enables writing of dot correction data to the internal nonvolatile memory. During normal operation, VROM must remain open-circuited - it is internally pulled down to GND via ~10 kΩ. Incorrect voltage or sustained application will corrupt calibration data or damage the EEPROM cell.
Does the TLC5970RHPR support both internal and external clock sources for grayscale timing?
Yes, the TLC5970RHPR supports selectable grayscale clock sources via the CLKSEL pin. When CLKSEL = low, the internal oscillator (8–12 MHz typical) generates the PWM clock autonomously. When CLKSEL = high, an external clock applied to SCKA/SCKB is used for grayscale timing - enabling precise synchronization across multiple TLC5970RHPR devices or alignment with system master clocks.
TLC5970RHPR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 28-VQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- DC DC Regulator
- Topology:
- Step-Down (Buck)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 3
- Voltage - Supply (Min):
- 10V
- Voltage - Supply (Max):
- 36V
- Voltage - Output:
- 17V
- Current - Output / Channel:
- 150mA
- Frequency:
- 20MHz
- Dimming:
- -
- Applications:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (6x6)
TLC5970RHPR FAQ
1.How can I place an order for TLC5970RHPR through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC5970RHPR 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 TLC5970RHPR reliable?
The price and inventory of TLC5970RHPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC5970RHPR is usually 5 days.
3.What payment methods are accepted for TLC5970RHPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC5970RHPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC5970RHPR?
TLC5970RHPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC5970RHPR 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 TLC5970RHPR?
For technical support, including TLC5970RHPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC5970RHPR requirements.
6.How does Aetrix verify that TLC5970RHPR is sourced from the original manufacturer or authorized distributors?
All TLC5970RHPR 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 TLC5970RHPR meets industry standards.
7.What is the process for return or replacement of TLC5970RHPR?
All TLC5970RHPR units undergo pre-shipment inspection (PSI). If there is an issue with TLC5970RHPR, 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 TLC5970RHPR part is unused and in its original packaging.
Return procedure for TLC5970RHPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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