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Texas Instruments TLC5945PWP
- Part No.:
- TLC5945PWP
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 28-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TLC5945PWP.pdf
- Description:
- IC LED DRIVER LIN 80MA 28HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,710
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Product details
Overview
TLC5945PWP from Texas Instruments is a 16-channel constant-current LED driver IC with integrated 12-bit grayscale PWM control (4096 steps) and 6-bit dot correction (64 steps), supporting up to 80 mA per channel and 17 V output voltage. It operates from 3.0 V to 5.5 V supply, features LED open detection (LOD) and thermal error flag (TEF), and is used in full-color LED displays, signage, and backlighting systems requiring precise per-channel current matching.
For engineers reviewing the TLC5945PWP datasheet, TLC5945PWP pinout, TLC5945PWP application, or TLC5945PWP equivalent, key selection criteria include its 28-pin HTSSOP PowerPAD™ package, serial interface timing (30 MHz SCLK/GSCLK), IREF-based current programming, and dual-mode operation (GS/DC register latching via MODE/XLAT).
Technical Context
The TLC5945PWP implements a dual-register architecture: a 192-bit grayscale (GS) register for 12-bit PWM brightness control and a 96-bit dot correction (DC) register for 6-bit per-channel current trimming. Grayscale counting is synchronized to GSCLK, with BLANK resetting the counter and forcing all outputs OFF.
It uses a single external resistor on IREF (VIREF = 1.24 V typical) to set maximum sink current (IOUT = 31.5 × VIREF/RIREF), enabling 5–80 mA per channel. Error reporting occurs via open-drain XERR, which asserts low on LOD (OUTn < 0.3 V while active) or TEF (junction > 160 °C).
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 adjustment - compensates for LED binning and PCB trace mismatch |
| Max output current | 80 mA per channel - supports high-brightness LEDs without external boost circuitry |
| 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 update rates for dynamic signage and scrolling text |
| Supply voltage | 3.0 V to 5.5 V - compatible with standard logic-level microcontrollers and industrial 3.3 V/5 V rails |
Pinout & Package
Package: 28-pin HTSSOP with exposed PowerPAD™ thermal pad (PWP), rated at 31.58 °C/W junction-to-ambient when soldered to 2-oz copper.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Primary return path for all internal logic and output current sinks; must be low-impedance connection to minimize noise coupling |
| BLANK (Pin 2) | Global output enable | Active-high signal that forces all OUTn OFF and resets grayscale counter - used for flicker-free frame blanking and PWM dimming synchronization |
| XLAT (Pin 3) | Data latch control | Level-triggered input that transfers serial data from shift register to GS or DC register - rising edge not required; hold time (10 ns) must be observed relative to SCLK |
| SCLK (Pin 4) | Serial clock input | Drives data shifting on rising edge; supports up to 30 MHz - determines maximum data throughput (192 bits @ 30 MHz = ~1.58 µs load time) |
| SIN (Pin 5) | Serial data input | MSB-first input for GS (192-bit) or DC (96-bit) data packets - requires setup time (5 ns) before SCLK↑ |
| MODE (Pin 6) | Operating mode select | GND = GS mode (192-bit grayscale); VCC = DC mode (96-bit dot correction) - must be stable during XLAT transitions |
| OUT0–OUT15 (Pins 7–22) | Constant-current sinks | 16 individually programmable current sources - each delivers precise sink current based on IREF and DCn/GSn values |
| VCC (Pin 28) | Power supply | 3.0–5.5 V logic and analog supply - decoupling capacitor (0.1 µF) required near pin for noise immunity |
| IREF (Pin 27) | Current reference input | Connects to external resistor to GND; sets Imax = 31.5 × 1.24 V / RIREF - defines full-scale output current for all channels |
| GSCLK (Pin 25) | Grayscale clock | Drives internal 12-bit counter; each rising edge increments count - determines PWM frequency (fPWM = fGSCLK/4096) |
| SOUT (Pin 24) | Serial data output | Shifts out status information (LOD/TEF/DC data) after XLAT pulse - enables daisy-chained readback without additional MCU pins |
| XERR (Pin 23) | Error flag output | Open-drain output pulled high externally; goes low on LOD or TEF - supports wired-OR fault reporting across multiple TLC5945PWP devices |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dot correction | 6-bit per-channel current trim (0–100% of Imax) - eliminates manual resistor calibration and improves display uniformity across 16 channels |
| LED open detection | Automatic monitoring of each OUTn voltage (< 0.3 V threshold) - detects broken LEDs without external sensing circuitry |
| Thermal error flag | Junction temperature monitoring with 160 °C typical trip point - prevents thermal runaway in high-density LED arrays |
| Dual-mode serial interface | Single 3-wire bus (SIN/SCLK/XLAT) supporting both grayscale and dot correction programming - reduces MCU GPIO count and simplifies firmware |
| Status register readback | 192-bit SID packet (LOD flags, TEF, DC values) accessible via SOUT - enables real-time health monitoring and diagnostics |
Applications
| LED Signage | Full-Color Video Displays |
|---|---|
Use Scenario: Outdoor alphanumeric message boards with red/green/blue LED modules driven by multiplexed column drivers. IC Role / Device Role / Timing Role: Constant-current sink driver providing synchronized grayscale PWM and per-pixel dot correction to maintain color fidelity across temperature and aging. Use Value: Eliminates visible banding and color shift by correcting channel-to-channel current mismatch up to ±8% over –40°C to 85°C. | Use Scenario: Indoor rental LED video walls with 16×16 pixel modules, requiring flicker-free 60 Hz refresh and smooth 10-bit+ grayscale rendering. IC Role / Device Role / Timing Role: Primary grayscale PWM controller with 4096-step resolution and 30 MHz data loading - enables sub-millisecond frame updates. Use Value: Achieves >1000:1 contrast ratio and motion blur reduction via precise GSCLK-synchronized blanking and counter reset. |
| Automotive Interior Lighting | Industrial Backlighting |
Use Scenario: RGB ambient lighting strips in vehicle cabins, controlled via CAN-FD gateway and requiring ASIL-B-aware fault reporting. IC Role / Device Role / Timing Role: Fault-tolerant LED driver with LOD and TEF reporting via XERR - integrates into automotive diagnostic networks without additional sensors. Use Value: Reduces BOM cost by replacing discrete current mirrors and thermal sensors while meeting ISO 16750-4 transient immunity requirements. | Use Scenario: High-reliability medical display backlights where LED failure must trigger immediate system alert and graceful degradation. IC Role / Device Role / Timing Role: Safety-critical current sink with real-time open-LED detection and status readback via SOUT - supports IEC 62304 Class C software verification. Use Value: Enables zero-latency fault response (<1 µs LOD detection delay) and eliminates need for redundant optical feedback loops. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC5947PWP | 24-channel version with identical 12-bit GS/6-bit DC architecture, same 28-pin HTSSOP package, but higher ICC (up to 60 mA) and extended thermal rating (TJ = 175 °C) | Designed for larger LED arrays requiring >16 channels without board redesign - shares same pinout and register map | Select TLC5947PWP when scaling from 16 to 24 channels while retaining layout and firmware compatibility |
| IS31FL3731-QFLS4-TR | 18-channel matrix LED driver with integrated auto-breathing, lower max current (40 mA), I²C interface instead of SPI-like serial, no XERR open-drain fault pin | Targeted at consumer UI lighting with animation effects - lacks LOD/TEF hardware reporting and dot correction granularity | Choose IS31FL3731-QFLS4-TR only for cost-sensitive non-industrial designs where fault visibility and per-LED calibration are secondary |
Compared with TLC5947PWP, the TLC5945PWP offers identical feature depth in a smaller channel count, reducing power dissipation and layout area; versus IS31FL3731-QFLS4-TR, it provides deterministic timing, hardware fault signaling, and finer current calibration - critical for industrial signage and safety-rated lighting.
Availability
TLC5945PWP is available at Aetrix Electronics and suitable for LED signage, full-color video displays, and automotive interior lighting requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for TLC5945PWP 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 experience in high-reliability LED driver design.
The TLC5945PWP belongs to TI's precision LED driver product line, engineered for applications demanding per-channel current accuracy, real-time fault detection, and seamless integration into large-scale LED display systems.
FAQ
What is the maximum output current per channel for the TLC5945PWP?
The TLC5945PWP supports up to 80 mA per channel (OUT0–OUT15) when configured with an appropriate IREF resistor. This value is calculated as Imax = 31.5 × VIREF/RIREF, where VIREF is 1.24 V typical. The device maintains ±4% channel-to-channel current matching across temperature and supply variations, ensuring consistent LED brightness in the TLC5945PWP-based design.
How does the TLC5945PWP implement LED open detection (LOD)?
The TLC5945PWP monitors each OUTn voltage during active sink operation; if the voltage drops below 0.3 V (typical) while current is enabled, the LOD flag activates. This condition is latched into the status register on the next XLAT↓ edge and reported via XERR (open-drain low) and bit 0–15 of the SOUT-shifted status packet. The TLC5945PWP requires no external components to perform this function, making it ideal for maintenance-free LED arrays.
Can the TLC5945PWP be cascaded with other TLC5945PWP devices?
Yes, the TLC5945PWP supports daisy-chain configuration using SOUT-to-SIN connections between devices. Each TLC5945PWP shifts its 192-bit grayscale or 96-bit dot correction data through the chain; the master MCU clocks all devices synchronously using shared SCLK, XLAT, and MODE lines. Status readback also cascades - the TLC5945PWP at the end of the chain outputs combined SID data, enabling centralized fault monitoring across dozens of channels.
What is the role of the MODE pin on the TLC5945PWP?
The MODE pin selects between two operational modes: grounded for 192-bit grayscale (GS) data loading, or pulled to VCC for 96-bit dot correction (DC) data loading. The TLC5945PWP requires MODE to be stable before and during XLAT assertion; switching MODE mid-operation may corrupt register contents. This dual-mode architecture allows separate calibration (DC) and dynamic content (GS) updates without reconfiguring the MCU interface, a core capability of the TLC5945PWP.
Does the TLC5945PWP require external components for thermal protection?
No, the TLC5945PWP integrates a thermal error flag (TEF) circuit that triggers when junction temperature exceeds ~160 °C. This event pulls XERR low and sets bit 16 in the status register, enabling immediate system response. While the TLC5945PWP includes this protection, proper thermal design - including soldering the PowerPAD™ to ≥2-oz copper and maintaining ≤31.58 °C/W thermal resistance - remains essential to avoid sustained TEF activation during normal operation.
TLC5945PWP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 28-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- Product Status:
- Last Time Buy
- 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:
- 80mA
- Frequency:
- 30MHz
- Dimming:
- -
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-HTSSOP
TLC5945PWP FAQ
1.How can I place an order for TLC5945PWP through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC5945PWP 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 TLC5945PWP reliable?
The price and inventory of TLC5945PWP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC5945PWP is usually 5 days.
3.What payment methods are accepted for TLC5945PWP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC5945PWP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC5945PWP?
TLC5945PWP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC5945PWP 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 TLC5945PWP?
For technical support, including TLC5945PWP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC5945PWP requirements.
6.How does Aetrix verify that TLC5945PWP is sourced from the original manufacturer or authorized distributors?
All TLC5945PWP 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 TLC5945PWP meets industry standards.
7.What is the process for return or replacement of TLC5945PWP?
All TLC5945PWP units undergo pre-shipment inspection (PSI). If there is an issue with TLC5945PWP, 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 TLC5945PWP part is unused and in its original packaging.
Return procedure for TLC5945PWP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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