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Texas Instruments TLC5952DAP
- Part No.:
- TLC5952DAP
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 32-PowerTSSOP (0.240", 6.10mm Width)
- Datasheet:
-
TLC5952DAP.pdf
- Description:
- IC LED DRV LIN 32HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:926
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Product details
Overview
TLC5952DAP from Texas Instruments is a 24-channel constant-current LED sink driver with three independent 7-bit global brightness control groups (R/G/B), ±1% channel-to-channel current matching, 35 mA max sink per red/green channel and 26.2 mA for blue channels, and integrated open/short LED detection - used in full-color LED displays requiring precise per-color dimming and fault monitoring.
For engineers reviewing the TLC5952DAP datasheet, TLC5952DAP pinout, TLC5952DAP application, or TLC5952DAP equivalent, key selection criteria include per-group brightness resolution, thermal error flag response time, BLANK pulse timing (15 ns), IREF resistor-based current programming, and daisy-chain serial interface compatibility with microcontroller SPI peripherals.
Technical Context
The TLC5952DAP implements a 25-bit serial shift register with separate latching (LAT) and blanking (BLANK) controls, enabling synchronized update of 24-channel on/off states and three 7-bit brightness registers. Its internal current regulation uses a single external IREF resistor to set maximum output current across all channels.
Error detection includes programmable LED open-detection thresholds (0.25–1.3 V), LED short-detection thresholds (0.55×VCC to 0.95×VCC), and thermal shutdown at 150°C with 5–20°C hysteresis - all readable via the same serial interface used for configuration and data loading.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output channels | 24 constant-current sinks, grouped as 8 red (OUTR0–7), 8 green (OUTG0–7), 8 blue (OUTB0–7) |
| Max sink current | 35 mA per OUTR/OUTG channel; 26.2 mA per OUTB channel - set by single RIREF resistor |
| Brightness control | Three independent 7-bit (128-step) global BC registers - enables per-color group dimming without per-channel PWM |
| Data rate | 35 MHz SCLK - supports high-refresh-rate LED panels with minimal serial bus overhead |
| BLANK pulse width | 15 ns minimum low pulse - enables precise black-level control and flicker-free scanning |
| Current accuracy | ±1% channel-to-channel matching within same color group; ±3% device-to-device variation |
| LED fault detection | Programmable open-load (LOD) and shorted-load (LSD) thresholds plus thermal error flag (TEF) |
Pinout & Package
Package: HTSSOP-32 (DAP) with exposed thermal pad (11.00 mm × 6.20 mm); designed for high-power LED driving with enhanced thermal dissipation (RθJA = 28.3°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Power ground reference | Primary return path for all output currents and internal logic; must be low-impedance connection to PCB ground plane |
| SIN (Pin 2) | Serial data input | Accepts 25-bit serial stream (24 on/off + 1 start bit) synchronized to SCLK rising edge |
| SCLK (Pin 3) | Serial clock input | Rising edge shifts SIN data into shift register; also clocks SOUT output and internal latch timing |
| LAT (Pin 4) | Latch enable | Rising edge transfers data from shift register to output on/off latch and brightness registers |
| BLANK (Pin 29) | Global output disable | High forces all 24 outputs OFF instantly; low enables output control via latch data and BC registers |
| IREF (Pin 32) | Reference current terminal | Connects external resistor to GND to set maximum output current for all channels (e.g., 1.5 kΩ → 32 mA R/G, 24 mA B) |
| SOUT (Pin 30) | Serial data output | MSB of shift register appears here on SCLK rising edge - enables daisy-chaining multiple TLC5952DAP devices |
| VCC (Pin 31) | Logic supply | 3 V to 5.5 V CMOS-compatible supply powering internal logic, interface, and bias circuits |
| OUTR0–7 (Pins 5,8,11,14,17,20,23,26) | Red LED current sinks | Each provides programmable constant-current sink up to 35 mA; voltage-tolerant to 15 V |
| OUTG0–7 (Pins 6,9,12,15,18,21,24,27) | Green LED current sinks | Identical electrical specs to red group - enables matched RGB channel design with shared RIREF |
| OUTB0–7 (Pins 7,10,13,16,19,22,25,28) | Blue LED current sinks | Lower max current (26.2 mA) optimized for typical blue LED forward voltage and efficiency |
Key Features
| Feature | Design Value |
|---|---|
| Per-group 7-bit brightness control | Enables independent dimming of red, green, and blue LED strings without increasing MCU PWM overhead or memory usage |
| Daisy-chain serial interface | Single SIN/SCLK/LAT/BLANK bus drives unlimited TLC5952DAP devices - reduces GPIO count and simplifies layout |
| Integrated LED open/short detection | Eliminates need for external sense resistors or ADC monitoring - reduces BOM and improves system reliability |
| Thermal shutdown with auto-restart | Protects against overtemperature failure during sustained high-current operation; resumes function after cooling |
| CMOS logic level I/O | Direct interface with 3.3 V or 5 V microcontrollers - no level-shifting required for control signals |
Applications
| Full-Color LED Displays | LED Signboards |
|---|---|
Use Scenario: High-resolution indoor/outdoor video walls using RGB SMD LEDs with uniform brightness and color fidelity. IC Role / Device Role / Timing Role: Constant-current sink driver providing synchronized per-pixel on/off and per-color group brightness control via daisy-chained serial interface. Use Value: Enables 128-step per-color dimming while maintaining ±1% channel matching - critical for grayscale linearity and color consistency across large panels. | Use Scenario: Outdoor advertising signboards requiring long-term reliability under variable ambient temperature and power conditions. IC Role / Device Role / Timing Role: Fault-tolerant LED driver with built-in open/short detection and thermal shutdown - monitors LED health continuously during operation. Use Value: Reduces field failures by detecting failed LEDs early and preventing cascading damage - lowers maintenance cost and downtime. |
| Architectural Lighting Systems | Stage & Entertainment Lighting |
Use Scenario: Dynamic color-tunable architectural lighting using RGBW LED modules controlled via DMX or proprietary protocols. IC Role / Device Role / Timing Role: Precision current source delivering stable output despite varying LED forward voltage drift across color bins and temperature. Use Value: Maintains consistent white point and CCT over time and temperature - eliminates visible color shift in static or slowly changing scenes. | Use Scenario: High-speed moving-light fixtures requiring rapid brightness transitions and flicker-free strobing. IC Role / Device Role / Timing Role: Fast BLANK control (15 ns pulse) and sub-50 ns LAT-to-output propagation enable microsecond-level LED switching. Use Value: Supports high-frequency PWM dimming without ghosting or trailing artifacts - essential for camera-synchronized effects. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar constant-current LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC5947DAP | 16-channel, 12-bit PWM per channel vs TLC5952DAP's 24-channel, 7-bit global BC; no integrated open/short detection | Better suited for applications needing per-channel grayscale depth over group-level dimming; lacks fault diagnostics | Select TLC5947DAP when per-LED PWM resolution >128 steps is required and fault monitoring is handled externally |
| IS31FL3731-QFLS4 | 28-channel, 8-bit per-channel PWM; I²C interface; integrated auto-breathing; no BLANK pin or thermal flag | Optimized for low-pin-count I²C systems; lacks high-speed serial daisy-chain and robust fault reporting | Choose IS31FL3731-QFLS4 for space-constrained designs where I²C simplicity outweighs diagnostic capability and refresh speed |
Compared with TLC5947DAP and IS31FL3731-QFLS4, the TLC5952DAP uniquely balances channel count (24), per-group brightness control, integrated LED fault detection, and high-speed serial interface - making it optimal for large-scale RGB display systems requiring reliability, scalability, and precise color management.
Availability
TLC5952DAP is available at Aetrix Electronics and suitable for full-color LED displays, outdoor signboards, architectural lighting systems, and stage lighting equipment requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for TLC5952DAP 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 company specializing in analog and embedded processing technologies, with leadership in power management, signal chain, and high-reliability ICs.
The TLC5952DAP belongs to TI's LED driver product line, engineered specifically for high-channel-count, fault-aware RGB LED systems where precision current matching, thermal resilience, and daisy-chain scalability are critical.
FAQ
What is the maximum LED supply voltage supported by the TLC5952DAP?
The TLC5952DAP supports LED power-supply voltages up to 15 V at its OUTR/OUTG/OUTB pins. This allows direct drive of multi-LED series strings without intermediate voltage conversion, provided the total forward voltage remains ≤15 V. The device itself operates from a separate 3 V to 5.5 V VCC supply for logic and interface functions.
How does the TLC5952DAP implement global brightness control across RGB groups?
The TLC5952DAP uses three independent 7-bit global brightness control (BC) registers - one each for red, green, and blue output groups. Each BC register scales the effective on-time of its respective 8-channel group proportionally, enabling coordinated dimming without altering individual on/off data. This is implemented in hardware, reducing MCU processing load versus per-channel PWM.
Can the TLC5952DAP detect both open and shorted LED faults, and how is this information accessed?
Yes, the TLC5952DAP integrates LED open detection (LOD), LED short detection (LSD), and thermal error flag (TEF). Detection thresholds are programmable via serial interface (e.g., LOD codes 0h–3h for 0.25–1.3 V; LSD codes 4h–7h for 0.55×VCC–0.95×VCC). All flags are read back through the same serial interface used for configuration and data loading.
What is the purpose of the BLANK pin on the TLC5952DAP, and what timing constraints apply?
The BLANK pin (Pin 29) forces all 24 output channels OFF immediately when driven high, overriding on/off latch data and brightness settings. Its minimum low-pulse duration is 15 ns - enabling precise black-level insertion between display frames to eliminate crosstalk and ensure flicker-free operation in high-refresh-rate applications.
How is output current programmed on the TLC5952DAP, and what tolerance should be expected?
Output current is programmed via a single external resistor (RIREF) connected between Pin 32 (IREF) and GND. Target currents are calculated as IOUT_R/G = 30 × (1.2 V / RIREF) and IOUT_B = 22.5 × (1.2 V / RIREF). Typical current accuracy is ±1% channel-to-channel and ±3% device-to-device, with line/load regulation better than ±1%/V under specified conditions.
TLC5952DAP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 32-PowerTSSOP (0.240", 6.10mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Linear
- Topology:
- Shift Register
- Internal Switch(s):
- Yes
- Number of Outputs:
- 24
- Voltage - Supply (Min):
- 3V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 15V
- Current - Output / Channel:
- 26.2mA, 35mA
- Frequency:
- 35MHz
- Dimming:
- -
- Applications:
- Signage
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-HTSSOP
TLC5952DAP FAQ
1.How can I place an order for TLC5952DAP through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC5952DAP 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 TLC5952DAP reliable?
The price and inventory of TLC5952DAP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC5952DAP is usually 5 days.
3.What payment methods are accepted for TLC5952DAP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC5952DAP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC5952DAP?
TLC5952DAP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC5952DAP 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 TLC5952DAP?
For technical support, including TLC5952DAP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC5952DAP requirements.
6.How does Aetrix verify that TLC5952DAP is sourced from the original manufacturer or authorized distributors?
All TLC5952DAP 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 TLC5952DAP meets industry standards.
7.What is the process for return or replacement of TLC5952DAP?
All TLC5952DAP units undergo pre-shipment inspection (PSI). If there is an issue with TLC5952DAP, 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 TLC5952DAP part is unused and in its original packaging.
Return procedure for TLC5952DAP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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