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Texas Instruments TLC5943PWPR
- Part No.:
- TLC5943PWPR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 28-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TLC5943PWPR.pdf
- Description:
- IC LED DRVR LINEAR 50MA 28HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,484
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Product details
Overview
TLC5943PWPR from Texas Instruments is a 16-channel, 16-bit PWM LED driver with 7-bit global brightness control and constant-current sink outputs. It delivers 50-mA per channel, supports 33-MHz grayscale clocking, enables LED open detection (LOD) and thermal error flag (TEF), and operates across –40°C to +85°C for full-color LED signage and display backlighting.
For engineers reviewing the TLC5943PWPR datasheet, TLC5943PWPR pinout, TLC5943PWPR application, or TLC5943PWPR equivalent, key selection criteria include its 16-bit enhanced spectrum PWM timing, daisy-chainable serial interface (SIN/SCLK/XLAT/BCSEL), IREF-based current setting, and dual-error reporting via open-drain XERR.
Technical Context
The TLC5943PWPR implements an Enhanced Spectrum (ES) PWM architecture that divides each display period into 128 segments and distributes 65,536 grayscale steps across them to reduce visible flicker and EMI. Its grayscale counter and auto-repeat logic enable continuous display refresh without host intervention.
It integrates two independent shift registers-one for 16-bit grayscale (GS) data and one for 7-bit brightness control (BC) data-both loaded via a single serial port and latched synchronously using XLAT. Error detection is hardware-automated: LOD monitors voltage drop across each OUTx during active drive, while TEF triggers at ~150°C junction temperature and forces all outputs off.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 16 constant-current sink outputs (OUT0–OUT15), each independently controllable |
| Grayscale resolution | 16-bit (65,536 steps) per channel, implemented via ES-PWM to minimize spectral peaks |
| Brightness control | 7-bit (128 steps) global scaling applied uniformly to all channels via BC register |
| Max sink current | 50 mA per channel, set by external IREF resistor (984 Ω to 9.84 kΩ) |
| Timing clocks | SCLK up to 30 MHz; GSCLK up to 33 MHz; BLANK and XLAT support sub-ns setup/hold |
| Error detection | Dedicated LOD (LED open/short-to-GND) and TEF (thermal shutdown at ~150°C) |
| Supply range | VCC = 3.0 V to 5.5 V; output voltage headroom up to 17 V (VOUT = –0.3 V to +18 V) |
Pinout & Package
HTSSOP-28 PowerPAD™ package (5.0 mm × 6.4 mm, 0.65 mm pitch) with exposed thermal pad soldered to PCB ground plane for enhanced power dissipation (3958 mW max at TA < +25°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SIN | Serial input | Data input for GS/BC shift registers; Schmitt-triggered for noise immunity |
| SCLK | Serial clock | Rising-edge-shift clock for GS/BC registers; selects register via BCSEL state |
| BCSEL | Register select | Low = grayscale register; high = brightness register; must not toggle during SCLK high |
| XLAT | Latch strobe | Low-to-high edge transfers data from shift register to first latch (GS or BC) |
| BLANK | Global disable | High = all outputs forced OFF, grayscale counter reset, PWM controller initialized |
| GSCLK | PWM timing clock | Rising edge increments grayscale counter; drives ES-PWM output timing |
| IREF | Current reference | Connect external resistor to GND to set max sink current (VIREF ≈ 1.20 V) |
| SOUT | Serial output | Daisy-chain output; mirrors MSB of selected shift register (GS or BC) |
| XERR | Error flag | Open-drain output pulled low on LOD or TEF detection; requires external pull-up |
| OUT0–OUT15 | Current sinks | 16 independent constant-current outputs; each capable of 50 mA sink into LED anodes |
| VCC / GND | Power rails | 3.0–5.5 V digital supply; GND shared with IREF return and thermal pad |
| XTEST | Factory test | Must be hard-connected to VCC or GND; no user function in normal operation |
Key Features
| Feature | Design Value |
|---|---|
| Enhanced Spectrum PWM | Distributes 65,536 grayscale steps across 128 display segments to suppress harmonic content and reduce EMI/flicker |
| Auto-display repeat | Hardware-enabled continuous PWM cycling without host CPU intervention after initial GS/BC load |
| Continuous LOD monitoring | Detects open-circuit and short-to-GND LED faults during active display periods-not just at startup |
| Thermal shutdown with hysteresis | TEF asserts at ~150°C; device restarts automatically once junction cools by ≥5°C |
| 4-channel grouped output delay | Staggers turn-on of OUT groups (0–3, 4–7, 8–11, 12–15) to limit inrush current and reduce supply ripple |
Applications
| Monochrome LED Signage | Full-Color RGB Display Panels |
|---|---|
Use Scenario: Outdoor alphanumeric message boards using discrete red/green/blue LEDs per pixel. IC Role / Device Role / Timing Role: Constant-current sink driver delivering precise grayscale and global brightness control per LED string. Use Value: Enables smooth 16-bit intensity gradation across large arrays while maintaining ±1.5% channel-to-channel current matching. | Use Scenario: Indoor video walls with high-density RGB surface-mount LED modules. IC Role / Device Role / Timing Role: Primary grayscale PWM controller managing 16 LED strings per IC, daisy-chained for scalability. Use Value: ES-PWM reduces electromagnetic interference during high-refresh-rate operation, critical for broadcast-grade image fidelity. |
| Automotive Interior Lighting | Industrial HMI Backlighting |
Use Scenario: Dimmable ambient lighting strips and dashboard indicator clusters in automotive cabins. IC Role / Device Role / Timing Role: Current-regulated driver supporting wide input voltage (12 V battery rail with local 5 V LDO) and thermal fault response. Use Value: Integrated TEF and LOD ensure fail-safe behavior under harsh thermal conditions and wiring fault scenarios. | Use Scenario: Control panel LCD backlights requiring uniform luminance and long-term stability. IC Role / Device Role / Timing Role: Precision current source for white LED strings, with 7-bit BC enabling system-level dimming via microcontroller. Use Value: ±3% device-to-device current accuracy ensures consistent brightness across multiple panels in production units. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC5947RTQR | 24-channel, same ES-PWM engine, QFN-40 package; adds internal 3.3 V regulator and improved LOD sensitivity | Higher channel density suits larger displays; internal regulator simplifies power design but increases quiescent current | Choose when scaling beyond 16 channels or needing integrated regulation |
| IS31FL3728-QFLS4-TR | 16-channel, 12-bit PWM, I²C interface, built-in EEPROM; no GSCLK pin or ES-PWM | Targeted at space-constrained designs with firmware-controlled dimming; lacks real-time error flags and high-speed serial interface | Choose for I²C-based systems prioritizing simplicity over flicker suppression and diagnostics |
Compared with TLC5943PWPR, TLC5947RTQR offers higher integration and channel count but requires board redesign, while IS31FL3728-QFLS4-TR trades PWM precision and diagnostic capability for ease of I²C integration and nonvolatile configuration storage.
Availability
TLC5943PWPR is available at Aetrix Electronics and suitable for monochrome signage, full-color display panels, automotive interior lighting, and industrial HMI backlighting requiring stable component supply, long-lifecycle support, and guaranteed traceability.
Supply support for TLC5943PWPR 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 high-reliability components for industrial, automotive, and consumer markets.
The TLC5943 belongs to TI's high-precision LED driver product line, engineered for applications demanding flicker-free grayscale control, robust fault diagnostics, and daisy-chain scalability in commercial and industrial lighting systems.
FAQ
What is the maximum output current per channel for the TLC5943PWPR?
The TLC5943PWPR supports up to 50 mA constant-current sink per channel (OUT0–OUT15), set by an external resistor connected between IREF and GND. The typical reference voltage at IREF is 1.20 V, and RIREF values from 984 Ω to 9.84 kΩ yield output currents from 5 mA to 50 mA. Operation below 5 mA may cause instability unless brightness control (BC) is used to scale down from a higher base current.
How does the TLC5943PWPR implement LED open detection (LOD)?
The TLC5943PWPR performs continuous LED open detection during active display periods-not just at initialization. It monitors the voltage at each OUTx pin while driving current; if the voltage exceeds ~0.3 V (typical), it flags an open or short-to-GND condition. Detected faults are reported via the open-drain XERR pin and stored in an internal status register accessible through serial readback after XLAT and BCSEL sequencing.
Can the TLC5943PWPR be daisy-chained, and how is data routed between devices?
Yes, the TLC5943PWPR supports seamless daisy-chaining via its SIN and SOUT pins. Serial data (GS or BC) is shifted into the first device's SIN pin at SCLK edges; the MSB of its selected shift register appears on SOUT on the next SCLK rising edge, feeding the SIN of the next device. XLAT latches data simultaneously across all chained devices, enabling synchronized grayscale and brightness updates across large LED arrays without additional control lines.
What is the role of the XTEST pin on the TLC5943PWPR?
The XTEST pin on the TLC5943PWPR is a factory test terminal with no user-accessible function in normal operation. It must be permanently tied to either VCC or GND-floating is prohibited. TI uses XTEST during wafer sort and final test; leaving it unconnected risks undefined behavior or failure to meet AC timing specifications. No external circuitry should be attached to XTEST in production designs.
Does the TLC5943PWPR support both grayscale and global brightness control simultaneously?
Yes, the TLC5943PWPR applies grayscale (GS) and brightness control (BC) hierarchically: GS data (16-bit per channel) sets individual LED intensity, while BC data (7-bit, common to all channels) scales the entire GS result linearly. For example, with BC = 64 (50% scale) and GS = 0xFFFF (100% duty), the effective output is 50% of full-scale current. Both registers are loaded separately via the same serial interface using BCSEL to route data to the correct shift register.
TLC5943PWPR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 28-PowerTSSOP (0.173", 4.40mm Width)
- 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:
- 50mA
- Frequency:
- 30MHz
- Dimming:
- -
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-HTSSOP
TLC5943PWPR FAQ
1.How can I place an order for TLC5943PWPR through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC5943PWPR 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 TLC5943PWPR reliable?
The price and inventory of TLC5943PWPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC5943PWPR is usually 5 days.
3.What payment methods are accepted for TLC5943PWPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC5943PWPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC5943PWPR?
TLC5943PWPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC5943PWPR 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 TLC5943PWPR?
For technical support, including TLC5943PWPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC5943PWPR requirements.
6.How does Aetrix verify that TLC5943PWPR is sourced from the original manufacturer or authorized distributors?
All TLC5943PWPR 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 TLC5943PWPR meets industry standards.
7.What is the process for return or replacement of TLC5943PWPR?
All TLC5943PWPR units undergo pre-shipment inspection (PSI). If there is an issue with TLC5943PWPR, 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 TLC5943PWPR part is unused and in its original packaging.
Return procedure for TLC5943PWPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLC5943PWPR Tags
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BCR402RE6327HTSA1
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BCR420UE6433HTMA1
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BCR421UE6327HTSA1
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LYT1604D-TL
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HV9910CLG-G
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CL2N8-G
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BCR420UW6-7
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BCR421UW6-7
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BCR420UFD-7
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BCR421UFD-7
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