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Texas Instruments TPS92518PWPR
- Part No.:
- TPS92518PWPR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 24-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS92518PWPR.pdf
- Description:
- IC LED DRIVER CTRLR PWM 24HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,719
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Product details
Overview
TPS92518PWPR from Texas Instruments is a dual-channel buck LED controller with SPI interface, designed for high-precision current regulation in automotive and industrial LED lighting systems. It supports 6.5 V to 42 V input, delivers independent quasi-hysteretic control per channel, enables 10,000:1 PWM dimming, and integrates high-side differential current sensing with programmable peak threshold (255 mV typ), off-time (4.1 µs typ at VLED=30 V), and thermal monitoring.
For engineers reviewing the TPS92518PWPR datasheet, TPS92518PWPR pinout, TPS92518PWPR application, or TPS92518PWPR equivalent, this page provides verified technical context, validated pin functions, confirmed dual-buck topology constraints, real-world dimming performance data, and two field-validated alternative parts for color-mixing, projector, and adaptive headlamp designs.
Technical Context
The TPS92518PWPR implements quasi-hysteretic peak-current control with digitally programmable analog thresholds via SPI: LEDx_PKTH_DAC (8-bit, 10–255 mV range), LEDx_TOFF_DAC (8-bit, 2–65 µs range at VLED=30 V), and LEDx_MAXOFF_DAC (8-bit, up to 65 µs). Each channel operates independently with cycle-by-cycle current limiting, leading-edge blanking (200 ns typ), and shunt-FET dimming support.
Its controlled-off-time architecture maintains constant peak-to-peak inductor ripple (ΔIL-PP) by scaling tOFF inversely with VLEDx - achieving µs·V constancy (e.g., 4 µs at 30 V → 8 µs at 15 V). Internal DACs drive analog comparators that directly set peak sense voltage and off-timer reference, eliminating external compensation while enabling CCM/DCM operation across 1 kHz–2 MHz switching frequencies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6.5 V to 42 V - supports direct battery connection in 12 V/24 V automotive systems without pre-regulation. |
| Peak Current Threshold | 255 mV typical (LEDx_PKTH_DAC = 255) - sets maximum inductor current with ±10 mV tolerance, enabling precise LED current calibration. |
| Off-Time (tOFF) | 4.1 µs typical at VLED = 30 V - determines switching frequency and inductor ripple; scales inversely with VLED to maintain ΔIL-PP stability. |
| PWM Dimming Range | 10,000:1 - enables high-fidelity grayscale control in projection and architectural lighting without visible flicker. |
| Analog Dimming Range | 255:1 - achieved via digital adjustment of peak current threshold, preserving linearity across full output current range. |
| Thermal Shutdown | 175 °C with 10 °C hysteresis - protects against sustained overtemperature in enclosed headlamp modules. |
| SPI Interface Speed | 2 MHz max clock (SCK period ≥500 ns) - allows rapid reconfiguration of both channels during runtime for dynamic lighting scenes. |
Pinout & Package
TPS92518PWPR is housed in a thermally enhanced 24-pin HTSSOP (PWP) package measuring 7.7 mm × 4.4 mm, with exposed thermal pad connected to GND for improved junction-to-board thermal resistance (15.7 °C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main power supply input | Accepts 6.5–42 V; powers internal LDOs and gate drivers; must be decoupled near pin 1. |
| CSP1 / CSN1 CSP2 / CSN2 |
Differential high-side current sense inputs | Measure voltage across external sense resistor; enable cycle-by-cycle current limiting and analog dimming. |
| GATE1 / GATE2 | High-side N-channel MOSFET gate drivers | Drive external FETs with 2.8 Ω low-side RDS(on); require bootstrap circuitry via BOOT1/BOOT2. |
| BOOT1 / BOOT2 | Bootstrap capacitor supply terminals | Provide floating gate drive voltage; UVLO triggers at 4.4 V falling threshold to prevent shoot-through. |
| VLED1 / VLED2 | Output voltage sense inputs | Set off-time proportional to LED string voltage; critical for maintaining constant ΔIL-PP across varying Vf. |
| PWM1 / PWM2 | Dedicated hardware dimming inputs | Directly modulate channel current at up to 20 kHz; no external components required for high-frequency PWM. |
| EN/UV | Enable and UVLO override pin | Rising threshold at 1.24 V enables device; >23.6 V bypasses SPI and loads default register values. |
| SCK / MOSI / MISO / SSN | SPI serial interface signals | Full-duplex communication for real-time configuration of all DAC registers and fault reporting. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent buck controllers | Enables synchronized or asynchronous operation of two LED strings with separate current, dimming, and protection settings. |
| Quasi-hysteretic control with COFT | Eliminates need for external loop compensation while supporting both CCM and DCM across wide load and input ranges. |
| Software-configurable analog dimming | 8-bit DAC adjusts peak current threshold (10–255 mV), enabling precise, linear current scaling without added components. |
| Integrated thermal monitoring | On-die temperature sensor feeds ADC (VTHERM register), allowing firmware-triggered derating before 175 °C shutdown. |
| Fault reporting via SPI | Real-time status of overcurrent, overvoltage, thermal warning, boot UVLO, and SPI errors - no additional monitoring circuitry needed. |
Applications
| Automotive Adaptive Headlamps | RGB Color-Mixing Modules |
|---|---|
|
Use Scenario: Dynamic matrix beam shaping using individually addressable LED segments in AHB systems. IC Role / Device Role / Timing Role: Dual-channel buck controller regulating two independent LED arrays with synchronized PWM dimming and fast transient response. Use Value: Enables <100 ns gate delay (tPWM = 68–105 ns) and 10,000:1 dimming for pixel-level brightness control without visible stepping. |
Use Scenario: Precise intensity balancing of red, green, and blue LED strings in stage lighting and video projectors. IC Role / Device Role / Timing Role: Independent current regulation per channel with matched analog dimming (255:1) and identical off-time programming. Use Value: Maintains color point accuracy across temperature (±0.5 mV VCST drift over –40°C to 125°C) and input variation. |
| Industrial High-Bay Lighting | Aftermarket LED Retrofit Kits |
|
Use Scenario: High-efficiency, thermally robust LED drivers for warehouse and factory ceiling fixtures operating 24/7. IC Role / Device Role / Timing Role: Dual-buck regulator driving parallel LED strings with integrated thermal shutdown (175 °C) and under-voltage lockout. Use Value: Delivers >92% efficiency (at 50 V input, 24 V output, 425 mA) with junction-to-board RθJB = 15.7 °C/W for passive cooling. |
Use Scenario: Plug-and-play replacement for halogen or HID lamps in vehicle auxiliary lighting (fog, work, off-road). IC Role / Device Role / Timing Role: Input-flexible buck controller accepting 9–36 V DC with EN/UV pin configurable as enable or UVLO. Use Value: Supports direct battery connection (no boost stage needed) and includes fault latching via SPI for diagnostics in unattended installations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS92518HV | Wider input range (6.5–65 V); identical pinout, SPI register map, and feature set. | Required for 48 V bus or boost-fed systems; not suitable for 12/24 V-only designs due to higher minimum VIN. | Select TPS92518HV only when input exceeds 42 V; otherwise TPS92518PWPR offers tighter parameter tolerances at lower cost. |
| LM3409QMH/NOPB | Single-channel, analog-only control (no SPI); fixed 1.24 V reference; no digital dimming or fault reporting. | Limited to basic constant-current LED drivers without color mixing, diagnostics, or firmware reconfiguration. | Use LM3409QMH/NOPB only for cost-sensitive, single-string applications where digital control and dual-channel operation are unnecessary. |
Compared with TPS92518PWPR, the TPS92518HV extends input capability but adds no new functionality, while the LM3409QMH/NOPB sacrifices programmability, dual-channel operation, and diagnostic capability for simplicity and lower BOM count.
Availability
TPS92518PWPR is available at Aetrix Electronics and suitable for automotive adaptive headlamps, RGB color-mixing modules, industrial high-bay lighting, aftermarket LED retrofit kits, and projector illumination systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for TPS92518PWPR 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 automotive ICs.
The TPS92518PWPR belongs to TI's LED driver product line, engineered specifically for high-reliability, digitally controllable multi-string LED systems in safety-critical automotive and industrial lighting applications.
FAQ
What is the maximum input voltage supported by the TPS92518PWPR?
The TPS92518PWPR supports a maximum input voltage of 42 V, as specified in its Recommended Operating Conditions. This makes it suitable for 12 V and 24 V automotive battery systems with transient margin. Exceeding 42 V risks permanent damage, as the Absolute Maximum Rating is 44 V. For 48 V or boost-fed applications, the TPS92518HV variant (65 V max) must be used instead of the TPS92518PWPR.
How does the TPS92518PWPR achieve 10,000:1 PWM dimming?
The TPS92518PWPR achieves 10,000:1 PWM dimming through dedicated hardware PWM inputs (PWM1/PWM2) with sub-100 ns propagation delay and internal timing circuitry optimized for high-frequency operation up to 20 kHz. Unlike software-based dimming, this hardware path avoids microcontroller jitter and ensures consistent duty-cycle fidelity across the full range - a capability confirmed in the datasheet's Features section and validated in typical application waveforms.
Can the TPS92518PWPR operate without SPI configuration?
Yes, the TPS92518PWPR can operate without SPI configuration: tying the EN/UV pin to >23.6 V bypasses SPI initialization and loads factory-default register values, enabling immediate analog dimming and basic buck operation. However, full functionality - including fault reporting, thermal monitoring, and fine-grained current calibration - requires SPI access to configure LEDx_PKTH_DAC, LEDx_TOFF_DAC, and other registers.
What is the purpose of the VLED1 and VLED2 pins on the TPS92518PWPR?
The VLED1 and VLED2 pins on the TPS92518PWPR serve as output voltage sense inputs that directly scale the off-time (tOFF) to maintain constant peak-to-peak inductor ripple (ΔIL-PP) across varying LED forward voltages. As described in Section 8.3.1.1, the internal off-timer current source is proportional to VLEDx, ensuring stable regulation and predictable switching frequency behavior - a core aspect of the TPS92518PWPR's quasi-hysteretic control architecture.
Does the TPS92518PWPR support shunt FET dimming?
Yes, the TPS92518PWPR explicitly supports high-frequency shunt FET dimming, as stated in its Features and Description sections. Its programmable maximum off-time (LEDx_MAXOFF_DAC) and fast gate drivers (tPWM = 68–105 ns) enable precise timing control of external shunt FETs, making it suitable for adaptive matrix headlamp systems where individual LED segments are dynamically shorted to ground for beam shaping.
TPS92518PWPR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Controller
- Topology:
- Step-Down (Buck)
- Internal Switch(s):
- No
- Number of Outputs:
- 2
- Voltage - Supply (Min):
- 6.5V
- Voltage - Supply (Max):
- 42V
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- 2MHz
- Dimming:
- Analog, PWM
- Applications:
- LED Lighting
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-HTSSOP
TPS92518PWPR FAQ
1.How can I place an order for TPS92518PWPR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS92518PWPR 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 TPS92518PWPR reliable?
The price and inventory of TPS92518PWPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS92518PWPR is usually 5 days.
3.What payment methods are accepted for TPS92518PWPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS92518PWPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS92518PWPR?
TPS92518PWPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS92518PWPR 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 TPS92518PWPR?
For technical support, including TPS92518PWPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS92518PWPR requirements.
6.How does Aetrix verify that TPS92518PWPR is sourced from the original manufacturer or authorized distributors?
All TPS92518PWPR 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 TPS92518PWPR meets industry standards.
7.What is the process for return or replacement of TPS92518PWPR?
All TPS92518PWPR units undergo pre-shipment inspection (PSI). If there is an issue with TPS92518PWPR, 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 TPS92518PWPR part is unused and in its original packaging.
Return procedure for TPS92518PWPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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