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Texas Instruments TPS92641PWPT/NOPB
- Part No.:
- TPS92641PWPT/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS92641PWPT/NOPB.pdf
- Description:
- IC LED DRIVER CTRLR PWM 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,989
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Product details
Overview
TPS92641PWPT/NOPB from Texas Instruments is a high-voltage synchronous buck LED controller with shunt FET PWM dimming capability, operating from 7 V to 85 V input, supporting up to 5 A LED current, featuring 3 V ±2% precision reference, 2-Ω/1-A peak gate drivers, and 20,000:1 shunt FET PWM dimming ratio for automotive and architectural LED lighting.
For engineers reviewing the TPS92641PWPT/NOPB datasheet, TPS92641PWPT/NOPB pinout, TPS92641PWPT/NOPB application, or TPS92641PWPT/NOPB equivalent, this device delivers valley-current-mode control with programmable switching frequency up to 1 MHz, true-zero analog dimming via IADJ, integrated overvoltage protection at VOUT, and thermal shutdown at 165°C - all in a 16-pin HTSSOP package with exposed thermal pad.
Technical Context
The TPS92641PWPT/NOPB implements valley-current-mode control using a controlled on-time architecture that maintains near-constant switching frequency without slope compensation. Its error amplifier features auto-zero calibration, achieving ≤±600 µV input offset for precise LED current regulation across temperature.
It integrates dual gate drivers (HG/LG) with 60 ns deadtime control, BOOT UVLO (1.9–4.5 V), and a dedicated shunt dimming driver (SDRV) with 68–100 ns SDIM-to-SDRV rising delay. The UDIM pin serves dual roles: PWM dimming input and undervoltage lockout with 1.276 V threshold and 21 µA hysteresis current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 7 V to 85 V - supports wide-input LED systems including 12 V, 24 V, and 48 V automotive and industrial rails. |
| LED Dimming Ratio | 20,000:1 (shunt FET PWM) - enables ultra-high-resolution brightness control without visible flicker in premium lighting. |
| VREF Accuracy | 3.03 V ±2% - provides stable reference for current-sense amplifier, minimizing LED current drift over voltage and temperature. |
| Gate Drive Strength | 2 Ω sourcing / 4.5 Ω sinking (LG); 3.9 Ω sourcing / 4.5 Ω sinking (HG) - ensures fast, low-loss switching of external NFETs up to 5 A load. |
| Thermal Shutdown | 165°C with 20°C hysteresis - protects against sustained overload or poor heatsinking in enclosed LED modules. |
| VOUT OVP Threshold | 3.05 V ±0.2 V - triggers overvoltage protection when scaled feedback exceeds safe LED string voltage limits. |
| SDIM Input Threshold | 1.29–1.74 V (rising), 0.5 V (falling) - compatible with standard 3.3 V/5 V logic PWM sources without level shifting. |
Pinout & Package
TPS92641PWPT/NOPB is housed in a 16-pin HTSSOP (PWP) package with 4.40 mm × 5.00 mm body size and exposed DAP thermal pad requiring 6–9 vias to GND plane for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VIN | Power input | High-voltage DC input (7–85 V); requires 1-µF ceramic bypass capacitor to GND. |
| 2 RON | Frequency programming | Connects to VIN via resistor to set on-time; combined with CON capacitor determines switching frequency up to 1 MHz. |
| 3 UDIM | Dual-function I/O | PWM dimming input and UVLO enable; 1.276 V threshold with 21 µA hysteresis current for programmable lockout. |
| 4 VOUT | Feedback input | Scaled-down output voltage sensing node; used with external resistor divider for overvoltage protection and regulation. |
| 5 VREF | Reference output | 3 V ±2% precision voltage source; bypass with 100-nF ceramic capacitor for stability and noise immunity. |
| 6 IADJ | Analog dimming control | Adjusts LED current setpoint via resistor divider from VREF; supports thermal foldback and true-zero dimming. |
| 7 COMP | Compensation node | Connects to GND via ceramic capacitor to configure loop stability; interfaces with internal transconductance amplifier (500 µA/V). |
| 8 SDIM | Shunt PWM input | Exclusive to TPS92641; accepts PWM signal to drive external shunt FET via SDRV pin for 20,000:1 dimming. |
| 9 SDRV | Shunt FET driver | Output gate driver for parallel NFET across LED string; 5.6–30 Ω sourcing resistance enables fast turn-on of shunt FET. |
| 10 HG | High-side gate driver | Drives gate of external high-side NFET; series resistor required to limit EMI and slew rate. |
| 11 SW | Switch node | Connects to buck converter switch node; critical for BOOT capacitor coupling and voltage sensing. |
| 12 BOOT | Bootstrap supply | Provides boosted voltage for HG drive; requires 100-nF ceramic capacitor between BOOT and SW. |
| 13 VCC | Bias supply | Internally regulated ~8.5 V output; bypass with 2.2-µF ceramic capacitor to support gate drivers and internal circuitry. |
| 14 LG | Low-side gate driver | Drives gate of external low-side NFET; series resistor recommended for EMI control and current limiting. |
| 15 CS | Current sense input | Connects to positive terminal of LED sense resistor; regulates VCS to IADJ/10 for accurate current control. |
| 16 GND | System ground | Power and signal reference; must be connected to DAP thermal pad via multiple vias for thermal and electrical integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Shunt FET PWM dimming | Enables 20,000:1 dimming ratio without LED current discontinuity - critical for flicker-free architectural and automotive lighting. |
| Valley-current-mode control | Eliminates need for slope compensation and maintains stable operation >50% duty cycle, simplifying loop design and improving transient response. |
| Auto-zero error amplifier | Reduces input offset to ≤±600 µV, enabling true-zero analog dimming and <1% LED current regulation error over temperature. |
| Dual-role UDIM pin | Combines PWM dimming interface and programmable UVLO (1.276 V threshold + 21 µA hysteresis current), reducing external component count. |
| Integrated overvoltage protection | Monitors VOUT feedback and shuts down if scaled voltage exceeds 3.05 V - prevents LED string overvoltage during open-circuit faults. |
Applications
| Automotive Headlamp Driver | Architectural Tunable White Lighting |
|---|---|
|
Use Scenario: High-brightness LED headlamps requiring adaptive beam shaping and dynamic dimming under 12 V/24 V vehicle battery conditions. IC Role / Device Role / Timing Role: Synchronous buck controller regulating constant LED current while executing shunt-FET PWM dimming for pixel-level intensity control. Use Value: Enables 20,000:1 dimming resolution and true-zero off-state without LED leakage, meeting UNECE R149 photometric requirements. |
Use Scenario: Multi-channel tunable white luminaires where correlated color temperature (CCT) is adjusted by independently dimming warm and cool LED strings. IC Role / Device Role / Timing Role: Precision current regulator per channel, using IADJ-based analog dimming for smooth CCT transitions and SDIM-driven shunt PWM for fine-grained brightness control. Use Value: Delivers <1% current matching between channels and eliminates color shift at low dimming levels via CCM-enforced true-zero operation. |
| Industrial High-Bay LED Fixture | Commercial Streetlight Driver |
|
Use Scenario: 100–200 W high-bay fixtures operating from 277 VAC rectified input, requiring robust thermal management and long-life reliability. IC Role / Device Role / Timing Role: Primary buck controller managing high-side/low-side NFETs, with VOUT-based OVP guarding against LED string open-circuit failure. Use Value: Supports 85 V max input and 165°C thermal shutdown, enabling direct connection to rectified line voltage without pre-regulator stage. |
Use Scenario: Outdoor streetlights exposed to wide ambient temperature swings (-40°C to +85°C) and requiring DALI-compatible dimming interfaces. IC Role / Device Role / Timing Role: Constant-current LED driver accepting PWM input via UDIM pin and providing isolated analog dimming via IADJ for DALI-to-analog translation. Use Value: Maintains ±2% LED current accuracy from -40°C to 125°C junction, ensuring consistent lumen output across environmental extremes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS92640PWPR | 14-pin HTSSOP; lacks SDIM/SDRV pins and shunt FET dimming capability; identical VIN range, VREF, gate drivers, and analog dimming. | Supports only 2500:1 standard PWM dimming (via UDIM) and 500:1 analog dimming - insufficient for flicker-sensitive architectural or automotive use cases. | Select when shunt dimming is unnecessary and PCB space or BOM cost reduction is prioritized over ultra-high dimming resolution. |
| LM3409HVMM/NOPB | 10-pin WSON; asynchronous (external diode) buck controller; no integrated VREF, no shunt dimming, no auto-zero amplifier; 6–75 V input. | Lacks true-zero analog dimming, programmable OVP, and high-resolution PWM - limited to basic constant-current LED drivers without advanced dimming compliance. | Choose for cost-sensitive, lower-performance industrial lighting where 1000:1 dimming and ±5% current accuracy are acceptable. |
Compared with TPS92641PWPT/NOPB, TPS92640PWPR omits shunt dimming hardware and reduces pin count, while LM3409HVMM/NOPB sacrifices precision regulation, integrated protection, and dimming fidelity for compactness and lower unit cost - making TPS92641PWPT/NOPB the only option meeting automotive-grade flicker and thermal foldback requirements.
Availability
TPS92641PWPT/NOPB is available at Aetrix Electronics and suitable for automotive headlamp systems, architectural tunable-white luminaires, industrial high-bay fixtures, and commercial streetlight drivers requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for TPS92641PWPT/NOPB 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 expertise in automotive-grade and industrial LED driver solutions.
The TPS9264x product line was designed specifically for high-reliability, high-dimming-fidelity LED current regulation in automotive, architectural, and outdoor lighting - emphasizing valley-current control, true-zero analog dimming, and integrated fault protection.
FAQ
What is the maximum input voltage supported by the TPS92641PWPT/NOPB?
The TPS92641PWPT/NOPB supports an absolute maximum input voltage of 90 V and operates continuously across a recommended range of 7 V to 85 V. This wide VIN range allows direct integration into 24 V, 48 V, and rectified 277 VAC systems without intermediate regulation, provided external MOSFETs and passive components are rated accordingly. The device includes internal input UVLO hysteresis via the UDIM pin to ensure clean startup and shutdown behavior.
How does the TPS92641PWPT/NOPB achieve 20,000:1 PWM dimming?
The TPS92641PWPT/NOPB achieves 20,000:1 PWM dimming through its dedicated shunt FET dimming architecture: the SDIM input controls the SDRV gate driver, which switches an external NFET placed in parallel with the LED string. This bypasses LED current during off-time, preserving inductor current continuity and eliminating low-current nonlinearity. Unlike standard PWM dimming of the main buck switch, shunt dimming avoids discontinuous conduction mode artifacts, enabling flicker-free dimming down to 0.005% duty cycle.
Can the TPS92641PWPT/NOPB operate in true-zero analog dimming mode?
Yes, the TPS92641PWPT/NOPB supports true-zero analog dimming via the IADJ pin. When IADJ is driven to 0 V, the internal error amplifier regulates LED current to zero average value while maintaining continuous conduction mode (CCM) - preventing LED turn-off artifacts. This requires an external ROFF resistor from VOUT to CS and a capacitor across the LED string to provide a negative current path. The auto-zero amplifier's ≤±600 µV offset ensures accurate null-point regulation across temperature.
What protection features are integrated into the TPS92641PWPT/NOPB?
The TPS92641PWPT/NOPB integrates cycle-by-cycle current limiting via the CS pin, VOUT-based overvoltage protection (2.85–3.25 V threshold), input UVLO (programmable via UDIM), thermal shutdown at 165°C with 20°C hysteresis, BOOT UVLO (1.9–4.5 V), and gate driver deadtime control (60 ns). These features eliminate the need for external protection ICs in most LED driver designs, enhancing system reliability and reducing BOM count.
Is the TPS92641PWPT/NOPB pin-compatible with any other TI LED controllers?
No, the TPS92641PWPT/NOPB is not pin-compatible with other TI LED controllers. Its 16-pin HTSSOP layout includes unique pins SDIM (pin 8) and SDRV (pin 9) absent in the 14-pin TPS92640PWPR. While both share VIN, RON, UDIM, VOUT, VREF, IADJ, COMP, HG, SW, BOOT, VCC, LG, CS, and GND pin functions, the additional shunt-dimming pins and different pin numbering prevent direct PCB substitution without layout revision.
TPS92641PWPT/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-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:
- 1
- Voltage - Supply (Min):
- 7V
- Voltage - Supply (Max):
- 85V
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- 1MHz
- Dimming:
- Analog, PWM
- Applications:
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-HTSSOP
TPS92641PWPT/NOPB FAQ
1.How can I place an order for TPS92641PWPT/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS92641PWPT/NOPB 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 TPS92641PWPT/NOPB reliable?
The price and inventory of TPS92641PWPT/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS92641PWPT/NOPB is usually 5 days.
3.What payment methods are accepted for TPS92641PWPT/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS92641PWPT/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS92641PWPT/NOPB?
TPS92641PWPT/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS92641PWPT/NOPB 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 TPS92641PWPT/NOPB?
For technical support, including TPS92641PWPT/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS92641PWPT/NOPB requirements.
6.How does Aetrix verify that TPS92641PWPT/NOPB is sourced from the original manufacturer or authorized distributors?
All TPS92641PWPT/NOPB 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 TPS92641PWPT/NOPB meets industry standards.
7.What is the process for return or replacement of TPS92641PWPT/NOPB?
All TPS92641PWPT/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with TPS92641PWPT/NOPB, 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 TPS92641PWPT/NOPB part is unused and in its original packaging.
Return procedure for TPS92641PWPT/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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