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Texas Instruments TPS92640PWP/NOPB
- Part No.:
- TPS92640PWP/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS92640PWP/NOPB.pdf
- Description:
- IC LED DRIVER CTRLR PWM 14HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:16,027
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Product details
Overview
TPS92640PWP/NOPB from Texas Instruments is a high-voltage synchronous buck LED controller for precision constant-current regulation in automotive and architectural lighting. It operates from 7 V to 85 V input, delivers up to 5 A output current, supports 500:1 analog dimming and 2500:1 standard PWM dimming, and integrates 2-Ω/1-A peak gate drivers for high-side and low-side NFETs - used in high-efficiency LED driver designs with true-zero analog dimming capability.
For engineers reviewing the TPS92640PWP/NOPB datasheet, TPS92640PWP/NOPB pinout, TPS92640PWP/NOPB application, or TPS92640PWP/NOPB equivalent, key selection criteria include its valley current-mode controlled on-time architecture, programmable switching frequency (up to 1 MHz), 3.03 V ±2% precision reference, undervoltage lockout via UDIM pin, and thermal shutdown at 165°C - all critical for robust LED current regulation across wide input and temperature ranges.
Technical Context
The TPS92640PWP/NOPB implements valley current-mode control using a controlled on-time architecture that dynamically adjusts tON based on VIN and scaled VOUT feedback, enabling near-constant switching frequency without slope compensation. Its error amplifier features auto-zero calibration, achieving ≤±600 µV input offset voltage for high-accuracy LED current regulation.
It integrates dual 2-Ω gate drivers with 60 ns deadtime control, BOOT UVLO threshold of 1.9–4.5 V, and a dedicated high-voltage start-up regulator delivering regulated 8.5 V (±0.64 V) at VCC with 63 mA current limit. The CS pin senses LED current with adjustable reference set by IADJ/10, supporting analog dimming down to true-zero LED current when configured with external ROFF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 7 V to 85 V - enables direct operation from 12 V, 24 V, and 48 V automotive or industrial bus rails without pre-regulation. |
| LED Current Regulation | Up to 5 A - supported by valley current sensing and auto-zero error amplifier with ≤±600 µV offset for stable constant-current output. |
| Analog Dimming Ratio | 500:1 - achieved via IADJ pin voltage scaling (0–2.54 V) controlling CS reference (VCSREF = VIADJ/10) with linear response and true-zero capability. |
| PWM Dimming Ratio | 2500:1 - enabled by UDIM pin with 1.276 V rising threshold and 21 µA hysteresis current for precise duty-cycle control of synchronous FETs. |
| Switching Frequency | Programmable up to 1 MHz - set by RON resistor and CON capacitor; maintains stability across input/output variations without loop compensation complexity. |
| Reference Voltage | 3.03 V ±2% - precision internal VREF supplies stable bias for IADJ, UDIM, and VOUT scaling circuits; bypassed with 100 nF ceramic capacitor. |
| Thermal Shutdown | 165°C with 20°C hysteresis - protects against sustained overtemperature in enclosed or high-power-density LED driver layouts. |
Pinout & Package
TPS92640PWP/NOPB is housed in a 14-pin HTSSOP package (4.40 mm × 5.00 mm) with exposed thermal pad (DAP) requiring 6–9 vias to GND for effective heat dissipation. Pin functions are validated per TI SNVS902A datasheet Rev. October 2015.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | High-voltage input rail connection (7–85 V); requires 1 µF ceramic bypass to GND. |
| RON | Frequency Programming | Connects external resistor to VIN to set on-time ramp rate and thus switching frequency. |
| UDIM | UVLO & PWM Input | Dual-function pin: 1.276 V UVLO threshold with 21 µA hysteresis current; also accepts PWM signal for brightness control. |
| VOUT | Output Voltage Feedback | Scaled-down feedback node for VOUT; sets on-time via resistor divider (RVOUT1/RVOUT2) to enable input/output adaptive regulation. |
| VREF | Precision Reference Output | 3.03 V ±2% stable reference; supplies bias for IADJ, UDIM, and external circuitry; requires 100 nF bypass. |
| IADJ | Analog Dimming Control | Sets LED current reference as VCSREF = VIADJ/10; supports thermal foldback when connected to NTC network. |
| COMP | Loop Compensation | Output of error amplifier; connects to GND via ceramic capacitor to stabilize current regulation loop. |
| HG | High-Side Gate Driver | Drives external high-side NFET gate; 2-Ω sourcing/sinking resistance; requires series resistor for EMI control. |
| SW | Switch Node | Connection to buck converter switch node; ties to BOOT capacitor and external high-side FET source. |
| BOOT | Bootstrap Supply | Provides boosted voltage for HG drive; requires 100 nF ceramic capacitor between BOOT and SW. |
| VCC | Bias Supply Output | Regulated ~8.5 V output from internal start-up regulator; bypassed with 2.2 µF ceramic capacitor. |
| LG | Low-Side Gate Driver | Drives external low-side NFET gate; 2-Ω sourcing/sinking resistance; series resistor recommended for slew control. |
| CS | Current Sense Input | Connects to sense resistor bottom; regulates LED current by comparing VCS to VCSREF = VIADJ/10. |
| GND | System Ground | Primary ground reference; must be tied to DAP thermal pad via multiple vias for thermal and noise integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Valley Current-Mode Control | Enables stable CCM operation across full dimming range, eliminating sub-harmonic oscillation and simplifying loop compensation. |
| True-Zero Analog Dimming | Supports zero-average LED current via IADJ = 0 V and external ROFF resistor, preserving linearity without discontinuous conduction artifacts. |
| Integrated High-Voltage Start-Up Regulator | Delivers regulated VCC from 7–85 V input, eliminating need for external bias supply and reducing BOM count. |
| Auto-Zero Error Amplifier | Reduces input offset to ≤±600 µV, ensuring accurate LED current regulation across temperature and load conditions. |
| Programmable UVLO with Hysteresis | UDIM pin provides 1.276 V turn-on threshold and user-configurable hysteresis via external resistor divider for reliable system startup. |
| Robust Protection Suite | Includes cycle-by-cycle current limiting, VOUT overvoltage protection (2.85–3.25 V threshold), and thermal shutdown at 165°C. |
Applications
| Automotive Headlamp Drivers | Architectural Tunable White Lighting |
|---|---|
Use Scenario: High-brightness LED headlamps requiring precise current regulation, wide input range (9–16 V battery + load dump), and smooth analog dimming for adaptive driving beams. IC Role / Device Role / Timing Role: Synchronous buck controller managing high-side/low-side NFETs, regulating LED current via CS feedback while accepting UDIM PWM commands from vehicle MCU. Use Value: 500:1 analog dimming and 2500:1 PWM dimming enable seamless transition between low-beam, high-beam, and cornering functions without visible steps or flicker. |
Use Scenario: Multi-channel tunable white luminaires where correlated color temperature (CCT) is adjusted by varying current ratios between warm-white and cool-white LED strings. IC Role / Device Role / Timing Role: Constant-current controller per channel, using IADJ voltage scaling to independently set each string's current with matched dimming curves. Use Value: Auto-zero amplifier and 3.03 V reference ensure <±1% current matching across channels, critical for maintaining target CCT under thermal drift. |
| Industrial High-Bay LED Fixtures | Commercial Parking Garage Lighting |
Use Scenario: 100–200 W high-bay fixtures operating from 277 VAC rectified input, requiring high efficiency (>90%), thermal resilience, and DALI-compatible dimming interface. IC Role / Device Role / Timing Role: Primary buck controller handling up to 5 A LED current; UDIM pin interfaces with DALI-to-analog translator IC for standardized dimming command reception. Use Value: 85 V max VIN rating and 165°C thermal shutdown allow direct use with bridge-rectified 277 VAC (≈390 VPK), eliminating bulky pre-regulators and improving system reliability. |
Use Scenario: Outdoor parking garage lighting with motion-sensing occupancy control, requiring deep dimming during idle periods and instant full-output recovery upon detection. IC Role / Device Role / Timing Role: LED current controller accepting fast PWM signals via UDIM pin; leverages controlled on-time architecture for <100 ns response to dimming transitions. Use Value: 2500:1 PWM dimming ratio and 60 ns deadtime minimize current overshoot during rapid on/off transitions, preventing visible flash or stress on LEDs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS92641PWP/NOPB | 16-pin HTSSOP with added SDIM/SDRV pins for shunt-FET PWM dimming; otherwise identical control architecture and specs. | Required when >2500:1 dimming ratio is needed via shunt-FET method (20,000:1), not achievable with TPS92640PWP/NOPB's UDIM-only PWM path. | Select TPS92641PWP/NOPB only if shunt-dimming topology is mandated; PCB layout and gate-drive routing differ due to extra pins and function. |
| LM3410XMYX/NOPB | Single-ended buck controller with integrated 1.5-A MOSFET; fixed 1.6 MHz frequency; no analog dimming; max VIN = 42 V. | Suitable for lower-power (<15 W), cost-sensitive designs where external FETs and wide VIN are unnecessary. | Choose LM3410XMYX/NOPB for compact, low-component-count solutions below 1.5 A; not a functional replacement for TPS92640PWP/NOPB's high-voltage, high-current, or analog-dimming requirements. |
Compared with TPS92641PWP/NOPB, the TPS92640PWP/NOPB omits shunt-dimming support but retains identical buck control, thermal performance, and analog dimming capability - making it optimal for UDIM-based systems where board space and BOM simplicity are prioritized. Versus LM3410XMYX/NOPB, it trades integration for scalability, supporting higher power, wider input, and precision dimming unattainable with the monolithic alternative.
Availability
TPS92640PWP/NOPB is available at Aetrix Electronics and suitable for automotive headlamp drivers, architectural tunable-white luminaires, and industrial high-bay LED fixtures requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for TPS92640PWP/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 LED driver innovation and automotive-grade reliability.
The TPS92640PWP/NOPB belongs to TI's high-voltage synchronous buck LED controller product line, designed specifically for precision current regulation in demanding lighting applications where wide input range, deep dimming, and thermal robustness are essential.
FAQ
What is the maximum input voltage supported by the TPS92640PWP/NOPB?
The TPS92640PWP/NOPB supports an absolute maximum input voltage of 90 V and a recommended operating range from 7 V to 85 V. This allows direct operation from 12 V, 24 V, and 48 V industrial or automotive supplies, and accommodates transient surges such as load dump events in vehicle systems. Operation above 85 V is outside the recommended range and may impact reliability or lifetime.
How does the TPS92640PWP/NOPB achieve true-zero analog dimming?
The TPS92640PWP/NOPB achieves true-zero analog dimming by setting the IADJ pin voltage to 0 V, which forces the CS reference (VCSREF = VIADJ/10) to 0 V. When combined with an external ROFF resistor from VOUT to CS, the controller maintains continuous conduction mode and regulates average LED current to precisely 0 A - verified in TI's SNVS902A datasheet Figure 17. This avoids discontinuous artifacts common in standard buck controllers.
Can the TPS92640PWP/NOPB be used without an external microcontroller?
Yes, the TPS92640PWP/NOPB operates autonomously without a microcontroller. Its UDIM pin accepts direct PWM signals for brightness control, IADJ can be set statically via resistor divider for fixed current, and RON/CON configure switching frequency. However, for dynamic thermal foldback or closed-loop color tuning, an MCU interfacing with IADJ and VOUT is recommended - but not required for basic constant-current LED driving.
What is the purpose of the DAP thermal pad on the TPS92640PWP/NOPB package?
The DAP (Exposed Thermal Pad) on the TPS92640PWP/NOPB HTSSOP package serves as the primary thermal conduction path from the die to the PCB ground plane. TI specifies 6–9 vias connecting the DAP directly to a solid GND copper area to achieve the rated RθJB of 20.9°C/W. Omitting or undersizing these vias significantly degrades thermal performance and risks premature thermal shutdown during sustained 5 A operation.
Does the TPS92640PWP/NOPB support synchronization to an external clock?
No, the TPS92640PWP/NOPB does not support external clock synchronization. Its switching frequency is determined solely by the RON resistor and CON capacitor, implementing a self-timed controlled on-time architecture. While this yields near-constant frequency across line/load variations, it lacks a SYNC pin or digital interface for master-slave clock alignment - a deliberate design choice to simplify layout and reduce EMI sensitivity.
TPS92640PWP/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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:
- 14-HTSSOP
TPS92640PWP/NOPB FAQ
1.How can I place an order for TPS92640PWP/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS92640PWP/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 TPS92640PWP/NOPB reliable?
The price and inventory of TPS92640PWP/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS92640PWP/NOPB is usually 5 days.
3.What payment methods are accepted for TPS92640PWP/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS92640PWP/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS92640PWP/NOPB?
TPS92640PWP/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS92640PWP/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 TPS92640PWP/NOPB?
For technical support, including TPS92640PWP/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS92640PWP/NOPB requirements.
6.How does Aetrix verify that TPS92640PWP/NOPB is sourced from the original manufacturer or authorized distributors?
All TPS92640PWP/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 TPS92640PWP/NOPB meets industry standards.
7.What is the process for return or replacement of TPS92640PWP/NOPB?
All TPS92640PWP/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with TPS92640PWP/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 TPS92640PWP/NOPB part is unused and in its original packaging.
Return procedure for TPS92640PWP/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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