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Texas Instruments HPA00479PWPR
- Part No.:
- HPA00479PWPR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- -
- Datasheet:
-
HPA00479PWPR.pdf
- Description:
- 16 CHANNEL 12 BIT PWM LED DRIVER
- Quantity:
- Payment:
- Shipping:
Inventory:1,136
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Product details
Overview
HPA00479PWPR from Texas Instruments is a 16-channel, 12-bit PWM LED driver with integrated 6-bit dot correction, operating from 3.0 V to 5.5 V supply and delivering up to 40 mA per channel with ±1% channel-to-channel current accuracy. It supports 30-MHz serial data transfer and 33-MHz grayscale PWM clocking for high-fidelity monochrome and full-color LED displays.
For engineers reviewing the HPA00479PWPR datasheet, HPA00479PWPR pinout, HPA00479PWPR application, or HPA00479PWPR equivalent, this device is selected for precise LED current control in signage, backlighting, and RGB pixel arrays where grayscale fidelity, per-channel brightness uniformity, and thermal error detection are critical design requirements.
Technical Context
The HPA00479PWPR implements dual-mode serial interface control via MODE pin: high for 96-bit dot correction (DC) data loading and low for 192-bit grayscale (GS) PWM data loading. Its internal 12-bit grayscale counter is synchronized to GSCLK and reset by BLANK, enabling deterministic PWM on-time down to one GSCLK period.
Each of the 16 constant-current sink outputs features independent 6-bit dot correction adjustment (0–100% of IOLCMax) and 12-bit grayscale timing (0–4095 steps), with real-time open-LED detection (LOD) and thermal error flag (TEF) reported via open-drain XERR pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 3.0 V to 5.5 V - compatible with standard logic-level microcontrollers and industrial 3.3 V/5 V systems |
| Output Current | Up to 40 mA per channel - set by single external IREF resistor; supports high-brightness LEDs up to 17 V forward voltage |
| Grayscale Resolution | 12-bit (4096 steps) - enables smooth intensity transitions without visible contouring in video-grade LED displays |
| Dot Correction | 6-bit (64 steps) - corrects per-channel LED luminance and color variation across panels or batches |
| Current Accuracy | ±1% (channel-to-channel), ±2% (device-to-device) - ensures consistent brightness without manual calibration |
| Error Detection | Continuous LOD + TEF reporting via XERR - enables system-level fault logging and automatic display reconfiguration |
| Operating Temp | –40°C to +85°C - qualified for outdoor signage, automotive interior lighting, and industrial HMI applications |
Pinout & Package
TSSOP-28 package with exposed thermal pad (PowerPAD™); 28-pin surface-mount footprint optimized for thermal dissipation in high-current LED driver layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT0–OUT15 | Constant-current sink outputs | 16 individually controlled LED cathode drivers; each sinks up to 40 mA with programmable dot correction and PWM timing |
| SIN / SOUT | Serial data input/output | Daisy-chain capable - SIN receives data from upstream device; SOUT forwards to next in chain for multi-chip configurations |
| SCLK / XLAT / GSCLK | Timing and latch control inputs | SCLK shifts data; XLAT latches DC/GS data; GSCLK clocks 12-bit grayscale counter - all CMOS-level, Schmitt-triggered |
| BLANK / MODE / XHALF | Functional mode controls | BLANK forces all outputs OFF and resets PWM counter; MODE selects DC vs GS mode; XHALF enables extended serial interface |
| IREF | Reference current setting | Connect external resistor to GND to set maximum output current (4–40 mA range); internal 1.20 V bandgap reference |
| XERR | Open-drain error output | Asserts low on LED open-circuit (LOD) or junction overtemperature (>150°C); supports wired-OR fault bus for multi-driver systems |
Key Features
| Feature | Design Value |
|---|---|
| 16-channel constant-current sink | Enables direct drive of 16 discrete LEDs or LED strings without external current-setting resistors per channel |
| 12-bit grayscale + 6-bit dot correction | Simultaneous high-resolution intensity control and per-channel luminance matching - eliminates visual non-uniformity in tiled displays |
| 30-MHz serial interface | Supports rapid frame updates for dynamic content; reduces host MCU overhead versus parallel interfaces |
| Integrated LOD and TEF detection | Reduces system-level BOM count by eliminating need for external open-circuit monitoring circuits or thermal sensors |
| Four-grouped output delay | Staggers turn-on timing across four groups of four outputs to limit peak inrush current and reduce EMI during global refresh |
Applications
| LED Signboards | Display Backlighting |
|---|---|
|
Use Scenario: Outdoor alphanumeric and graphic message boards using high-brightness red/green/blue LED modules. IC Role / Device Role / Timing Role: Constant-current sink driver with per-pixel grayscale and dot correction for uniform brightness across large-area displays. Use Value: Eliminates visible column/row brightness gradients and compensates for LED binning variations across thousands of pixels. |
Use Scenario: Edge-lit LCD backlights for industrial HMIs and medical displays requiring precise dimming and flicker-free operation. IC Role / Device Role / Timing Role: PWM-controlled current source for white LED strings, synchronized to system BLANK signal for zero-flicker dimming. Use Value: Achieves >10,000:1 dimming ratio using 12-bit grayscale while maintaining color point stability via fixed current per string. |
| Full-Color RGB Pixel Arrays | Monochrome LED Panels |
|
Use Scenario: Indoor video walls composed of RGB SMD LED modules with tight brightness and chromaticity tolerances. IC Role / Device Role / Timing Role: Per-channel current driver with independent 6-bit dot correction for R/G/B subpixels and 12-bit grayscale for intensity grading. Use Value: Enables factory-calibrated white-point tuning and lifetime drift compensation without per-subpixel analog trimming. |
Use Scenario: High-reliability status indicators and segmented displays in transportation and energy infrastructure equipment. IC Role / Device Role / Timing Role: Robust constant-current sink with thermal shutdown and open-LED detection for fail-safe operation. Use Value: Guarantees visibility under extreme ambient temperatures and provides diagnostic feedback for predictive maintenance. |
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 in HTSSOP-32; identical 12-bit/6-bit architecture but higher channel count and 32-pin footprint | Better suited for larger displays requiring >16 channels per IC; requires PCB layout revision due to different pinout and package | Select when scaling channel density without changing driver architecture or firmware interface |
| IS31FL3731-QFLS4-TR | 18-channel matrix driver with built-in auto-breathing and frame control; I²C interface instead of SPI-like serial | Targets smaller embedded displays with animation features; lacks LOD/TEF flags and external IREF programming | Choose for space-constrained designs needing integrated effects and simpler two-wire control, not high-accuracy current matching |
Compared with TLC5947PWP and IS31FL3731-QFLS4-TR, HPA00479PWPR offers optimal balance of channel count, precision current matching, and diagnostic capability in a compact TSSOP-28 package - making it ideal for mid-size LED signage and backlight modules where layout reuse and thermal reliability are prioritized.
Availability
HPA00479PWPR is available at Aetrix Electronics and suitable for LED signboards, display backlighting, and full-color RGB pixel arrays requiring stable component supply, long-term lifecycle support, and traceable sourcing for production programs.
Supply support for HPA00479PWPR 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 LED driver innovation.
The TLC5946 family - including HPA00479PWPR - was designed specifically for high-precision, high-channel-count LED current control in commercial signage, architectural lighting, and industrial HMIs demanding robust thermal and fault management.
FAQ
What is the maximum LED forward voltage supported by HPA00479PWPR?
HPA00479PWPR supports LED forward voltages up to 17 V at its OUT0–OUT15 pins. This allows direct driving of multi-LED series strings powered from common 12 V or 24 V rails without intermediate buck converters, provided the total VF remains ≤17 V and the device's thermal limits are observed.
How does the dot correction function work in HPA00479PWPR?
In HPA00479PWPR, dot correction uses 6-bit values (0–63) per channel to scale the maximum output current (IOLCMax) linearly. When MODE = high, 96-bit serial data loads into the dot correction latch; each channel's output becomes IOUTn = IOLCMax × (DCn/63), enabling per-LED brightness calibration without altering grayscale timing.
Can HPA00479PWPR be daisy-chained with other devices?
Yes, HPA00479PWPR supports daisy-chaining via SIN and SOUT pins. Data shifted into SIN propagates through the internal 96-bit (dot correction) or 192-bit (grayscale) shift register and exits SOUT, allowing multiple HPA00479PWPR devices to share a single SCLK/XLAT/GSCLK bus - reducing MCU GPIO count and simplifying PCB routing.
What thermal protection features does HPA00479PWPR include?
HPA00479PWPR integrates a thermal error flag (TEF) that asserts low on XERR when junction temperature exceeds +150°C (typical threshold). The flag includes +10°C hysteresis to prevent chatter during thermal transients. No external components are required - the feature operates autonomously using on-die thermal sensing.
How is the maximum output current set for HPA00479PWPR?
The maximum output current (IOLCMax) of HPA00479PWPR is set by an external resistor (RIREF) between IREF and GND. With a typical internal 1.20 V bandgap reference, RIREF = 1.20 V / IOLCMax. For example, 30 mA requires RIREF ≈ 40 Ω; the datasheet specifies valid range: 1.275 kΩ to 12.75 kΩ (4–40 mA).
HPA00479PWPR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- -
- Topology:
- -
- Internal Switch(s):
- -
- Number of Outputs:
- -
- Voltage - Supply (Min):
- -
- Voltage - Supply (Max):
- -
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- -
- Dimming:
- -
- Applications:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
HPA00479PWPR FAQ
1.How can I place an order for HPA00479PWPR through Aetrix?
Please submit a Request for Quotation (RFQ) for HPA00479PWPR 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 HPA00479PWPR reliable?
The price and inventory of HPA00479PWPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HPA00479PWPR is usually 5 days.
3.What payment methods are accepted for HPA00479PWPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HPA00479PWPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HPA00479PWPR?
HPA00479PWPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HPA00479PWPR 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 HPA00479PWPR?
For technical support, including HPA00479PWPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HPA00479PWPR requirements.
6.How does Aetrix verify that HPA00479PWPR is sourced from the original manufacturer or authorized distributors?
All HPA00479PWPR 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 HPA00479PWPR meets industry standards.
7.What is the process for return or replacement of HPA00479PWPR?
All HPA00479PWPR units undergo pre-shipment inspection (PSI). If there is an issue with HPA00479PWPR, 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 HPA00479PWPR part is unused and in its original packaging.
Return procedure for HPA00479PWPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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