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Texas Instruments TLC5970RHPT
- Part No.:
- TLC5970RHPT
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 28-VQFN Exposed Pad
- Datasheet:
-
TLC5970RHPT.pdf
- Description:
- IC LED DRIVER RGLTR 150MA 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,207
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Product details
Overview
TLC5970RHPT from Texas Instruments is a 3-channel, 12-bit PWM LED driver IC with integrated buck DC/DC converter and differential signal interface (DSI), delivering 150 mA constant-current sink per channel, 12-bit grayscale control (4096 steps), and EEPROM-based dot correction for LED uniformity - used in large-area static LED displays and architectural lighting systems.
For engineers reviewing the TLC5970RHPT datasheet, TLC5970RHPT pinout, TLC5970RHPT application, or TLC5970RHPT equivalent, key selection considerations include its QFN-28 package, differential cascading capability up to unlimited devices, auto-refresh timing, and dual-mode GS clock (internal/external) - all critical for long-distance, high-reliability LED signage designs.
Technical Context
The TLC5970RHPT integrates a synchronous buck converter (PH/BOOT/FB pins) with auto LED anode voltage control (up to 17 V), enabling efficient power delivery while minimizing cathode-to-ground voltage drop to ~1 V. Its differential interface (SDTA/SDTB/SCKA/SCKB inputs; SDTY/SDTZ/SCKY/SCKZ outputs) supports 20 MHz data transfer and noise-immune cascading over long cables.
Each of the three output channels (OUT0–OUT2) features independent 7-bit dot correction (DC), 7-bit global brightness control (BC), and 12-bit PWM grayscale (GS) - all stored and updated via 36-bit shift registers and latched through a common DSI protocol. Thermal shutdown triggers at +138°C (pre-shutdown) and +150°C (hard shutdown).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Channels | 3 independent constant-current sink outputs (OUT0–OUT2), each configurable up to 150 mA |
| Grayscale Resolution | 12-bit (4096 steps) PWM per channel - enables smooth dimming without visible flicker in static displays |
| Differential Interface Speed | 20 MHz max SCKA/SCKB frequency - supports >10 m cable runs with EMI resilience in industrial environments |
| Dot Correction Range | 7-bit (128 steps) per channel, stored in internal EEPROM - corrects LED binning variance across panels |
| Buck Converter Input | 10–36 V VCC input; FB pin regulates LED supply up to 17 V - reduces system-level current and enables thin-gauge wiring |
| Accuracy | ±0.5% typical channel-to-channel current matching - ensures consistent luminance across RGB subpixels |
| Package | QFN-28 (6.0 mm × 6.0 mm, RHP), thermally enhanced with exposed ground pad - supports >2.6 W dissipation at +70°C ambient |
Pinout & Package
Package: QFN-28 (RHP), 6.0 mm × 6.0 mm, 0.5 mm pitch, exposed thermal pad (internally connected to GND). Requires soldering thermal pad to PCB ground plane for thermal compliance (θJA = 26.7°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 26) | Power ground reference | Primary return path for all analog/digital currents; must be low-impedance connection to PCB ground plane |
| VCC (Pin 24) | Main power supply input | 10–36 V input for buck converter and logic; decoupling required near pin |
| OUT0–OUT2 (Pins 17–19) | Constant-current sink outputs | Each drives LED cathodes; multiple outputs may be paralleled to increase current capacity |
| IREF0–IREF2 (Pins 4–2) | Current-setting reference inputs | External resistors to GND set max sink current per channel (1 kΩ → 150 mA; 15 kΩ → 10 mA) |
| SDTA/SDTB (Pins 6/7) | Differential serial data input pair | Accepts LVDS-like signals; common-mode range –7 V to +12 V - immune to ground bounce in daisy-chained systems |
| SCKA/SCKB (Pins 9/10) | Differential clock input pair | 20 MHz max edge rate; synchronizes data shift into 40-bit common register |
| SDTY/SDTZ (Pins 16/15) | Differential serial data output pair | Re-transmits received data downstream - enables unlimited device cascading without repeaters |
| SCKY/SCKZ (Pins 13/12) | Differential clock output pair | Regenerates clock for next device; maintains timing integrity across long chains |
| FB (Pin 20) | Buck converter feedback input | Monitors LED supply voltage; sets output to 7–17 V range - auto-adjusts to minimize OUT-to-GND voltage drop |
| PH (Pin 22) | High-side MOSFET source | Drives external inductor/diode; switching frequency up to 1.5 MHz - enables compact magnetics design |
| BOOT (Pin 21) | Bootstrap capacitor connection | Connects to PH via 0.1 µF ceramic cap - sustains gate drive for high-side switch during duty cycle |
| VREG (Pin 28) | Internal 5-V regulator output | Supplies core logic; requires 0.01 µF decoupling - not loadable beyond internal consumption |
| VREGIF (Pin 1) | Differential interface regulator output | 5-V supply for DSI drivers/receivers; requires 0.1 µF decoupling - isolated from VREG for noise separation |
| SWOFF (Pin 27) | Buck converter enable/disable | Pulled down internally; tie to VREG to disable buck stage - useful for fixed-voltage LED supplies |
| VROM (Pin 5) | EEPROM programming voltage | 19 V required only during dot-correction write cycles; open during normal operation |
Key Features
| Feature | Design Value |
|---|---|
| Integrated buck DC/DC converter | Reduces system power loss by optimizing LED anode voltage - lowers OUT-to-GND headroom to ~1 V, enabling thinner wiring and higher efficiency |
| Differential signal interface (DSI) | Enables noise-immune, long-distance cascading (>10 m) with 20 MHz data rate and unlimited device count - eliminates need for external level shifters or repeaters |
| On-chip EEPROM for dot correction | Stores 7-bit per-channel correction data non-volatilely - eliminates factory calibration rework and supports field updates via VROM pin |
| Auto-display repeat / auto-data refresh | Maintains stable LED output without continuous host MCU intervention - reduces firmware overhead in embedded display controllers |
| Thermal protection with pre-shutdown warning | Triggers pre-shutdown flag at +138°C junction temp and full shutdown at +150°C - prevents thermal runaway in enclosed fixtures |
| Global brightness + per-channel dot correction | Allows simultaneous luminance scaling (7-bit BC) and pixel-level uniformity tuning (7-bit DC) - essential for color-critical signage and video walls |
Applications
| Architectural LED Facades | Outdoor Digital Billboards |
|---|---|
Use Scenario: Large-scale building-mounted LED arrays requiring uniform brightness across hundreds of modules under variable ambient temperatures. IC Role / Device Role / Timing Role: TLC5970RHPT acts as channel-specific current sink and grayscale controller, with buck converter maintaining optimal LED forward voltage while DSI ensures synchronized frame updates across cascaded modules. Use Value: ±0.5% channel-to-channel current matching and on-board dot correction eliminate visible banding; auto-refresh reduces host processor load during extended static displays. |
Use Scenario: High-brightness outdoor advertising displays exposed to solar heating and EMI from nearby RF sources. IC Role / Device Role / Timing Role: TLC5970RHPT provides robust differential signaling (SDTA/SDTB/SCKA/SCKB) to reject noise over 15 m cable runs, while thermal shutdown protects against enclosure overheating. Use Value: 20 MHz DSI interface and ±3% device-to-device current accuracy ensure consistent luminance across multi-panel installations without manual recalibration. |
| Stage & Event Lighting Panels | Industrial Control Panel Indicators |
Use Scenario: Modular stage lighting systems requiring rapid, flicker-free intensity ramping and RGB color mixing across dozens of nodes. IC Role / Device Role / Timing Role: TLC5970RHPT delivers 12-bit PWM grayscale with internal oscillator (8–12 MHz) or external clock sync - enabling precise timing alignment across distributed light engines. Use Value: 4096-step grayscale resolution enables smooth dimming curves; cascaded DSI eliminates timing skew between adjacent panels. |
Use Scenario: Harsh-environment HMI panels where LED indicators must remain visible under strong ambient light and survive vibration/shock. IC Role / Device Role / Timing Role: TLC5970RHPT serves as ruggedized LED driver with integrated buck regulation - sustaining 150 mA output even with 36 V supply transients common in 24 V industrial buses. Use Value: Absolute maximum rating of +40 V on VCC and thermal shutdown protect against load-dump events; QFN-28 package withstands mechanical stress better than SOIC alternatives. |
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 PWM; no EEPROM; uses single-ended SPI interface | Better suited for low-voltage, high-channel-count PCB-mounted LED arrays where board space allows discrete DC/DC | Select when system already provides regulated 5 V and needs >3 channels - but avoid for long-cable or high-voltage LED supply scenarios |
| AL8863SP-13 | Single-channel buck LED driver (no PWM dimming); analog/digital dimming only; no DSI; no dot correction; 1.5 A output | Targeted at high-power single-LED strings (e.g., streetlights), not multi-channel pixel control | Choose only for cost-sensitive, single-color, high-current applications - not a functional substitute for TLC5970RHPT's multi-channel grayscale + DSI architecture |
Compared with TLC5940RHBR and AL8863SP-13, the TLC5970RHPT uniquely combines integrated buck conversion, differential cascading, and per-channel dot correction - making it irreplaceable for large-format, long-cable, color-uniform LED signage where power efficiency, noise immunity, and factory calibration scalability are mandatory.
Availability
TLC5970RHPT is available at Aetrix Electronics and suitable for architectural LED facades, outdoor digital billboards, and stage lighting systems requiring stable component supply, long-lifecycle support, and traceable sourcing for safety-critical installations.
Supply support for TLC5970RHPT 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 expertise in high-reliability LED driver innovation.
The TLC5970RHPT belongs to TI's high-performance LED driver product line, engineered specifically for large-area, static-color LED displays demanding precision current matching, noise-immune communication, and thermal robustness in uncontrolled environments.
FAQ
What is the maximum LED supply voltage supported by the TLC5970RHPT buck converter?
The TLC5970RHPT buck converter supports an LED supply voltage (at the FB pin) up to 17 V. This is regulated dynamically to maintain minimal voltage headroom (~1 V) across the OUT pins, improving system efficiency and enabling thinner gauge wiring. Operation above 17 V risks exceeding absolute maximum ratings and triggering overvoltage protection.
Can the TLC5970RHPT drive more than 150 mA per channel?
No - the TLC5970RHPT is specified for a maximum constant-current sink of 150 mA per channel (OUT0–OUT2) under recommended conditions. Exceeding this limit violates absolute maximum ratings and may cause thermal shutdown or permanent damage. Parallel outputs (e.g., OUT0 + OUT1) are allowed to increase total current, but per-pin current must remain ≤150 mA.
How does the differential interface (DSI) of the TLC5970RHPT enable unlimited device cascading?
The TLC5970RHPT implements true DSI regeneration: SDTA/SDTB and SCKA/SCKB inputs are retimed and re-driven as SDTY/SDTZ and SCKY/SCKZ outputs with matched propagation delays. This eliminates cumulative jitter and signal degradation, allowing arbitrary-length daisy chains without external repeaters - verified in TI's application notes for >100-device configurations.
Is external EEPROM required for dot correction on the TLC5970RHPT?
No - the TLC5970RHPT contains internal EEPROM dedicated to storing 7-bit dot correction data per channel (3 × 7 bits). Programming requires applying 19 V to the VROM pin while issuing the correct command sequence; no external memory is needed, simplifying BOM and reducing board area.
What thermal management is required for the TLC5970RHPT in continuous 150 mA operation?
At full load (150 mA × 3 channels, VCC = 24 V), the TLC5970RHPT dissipates ~2.6 W. The QFN-28 RHP package requires the exposed thermal pad to be soldered to a minimum 200 mm² copper pour tied to inner-layer ground planes. Without this, junction temperature exceeds safe limits (>125°C) within seconds - thermal shutdown will activate.
TLC5970RHPT 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)
TLC5970RHPT FAQ
1.How can I place an order for TLC5970RHPT through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC5970RHPT 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 TLC5970RHPT reliable?
The price and inventory of TLC5970RHPT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC5970RHPT is usually 5 days.
3.What payment methods are accepted for TLC5970RHPT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC5970RHPT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC5970RHPT?
TLC5970RHPT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC5970RHPT 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 TLC5970RHPT?
For technical support, including TLC5970RHPT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC5970RHPT requirements.
6.How does Aetrix verify that TLC5970RHPT is sourced from the original manufacturer or authorized distributors?
All TLC5970RHPT 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 TLC5970RHPT meets industry standards.
7.What is the process for return or replacement of TLC5970RHPT?
All TLC5970RHPT units undergo pre-shipment inspection (PSI). If there is an issue with TLC5970RHPT, 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 TLC5970RHPT part is unused and in its original packaging.
Return procedure for TLC5970RHPT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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