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Texas Instruments TPS92550TZ/NOPB
- Part No.:
- TPS92550TZ/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- TO-PMOD-7, Power Module
- Datasheet:
-
TPS92550TZ/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 450MA 7PMOD
- Quantity:
- Payment:
- Shipping:
Inventory:1,367
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Product details
Overview
TPS92550TZ/NOPB from Texas Instruments is a 7-pin TO-PMOD (NDW) constant-current buck LED driver micro-module delivering up to 450mA LED current at up to 14W output, supporting up to 10-series LEDs with 4.5V–36V input range and 400kHz fixed switching frequency. It integrates the power inductor and operates without external current-sense resistors, targeting high-efficiency architectural and street lighting.
For engineers reviewing the TPS92550TZ/NOPB datasheet, TPS92550TZ/NOPB pinout, TPS92550TZ/NOPB application, or TPS92550TZ/NOPB equivalent, key selection criteria include ±3.6% LED current accuracy, 16µs minimum PWM dimming pulse width, EN55015-compliant EMI performance, thermal shutdown at 170°C, and parallel operation capability for >450mA loads.
Technical Context
The TPS92550TZ/NOPB implements a floating buck topology with integrated MOSFET and shielded power inductor, enabling direct connection to high-side LED strings without external sensing. Its control loop delivers fast transient response for precise PWM dimming down to 16µs pulses at 240Hz, achieving 256-step resolution.
It features internal VREF (1.2V), IADJ-based LED current adjustment via external resistor (300–450mA), and DIM pin with 1.2V threshold and 0.25V hysteresis. Protection includes LED open/short detection, input UVLO, and thermal shutdown with 10°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LED Current Range | 300mA to 450mA adjustable via IADJ resistor; factory preset at 350mA (±3.6% accuracy over –40°C to +125°C). |
| Input Voltage Range | 4.5V to 36V DC; supports wide-range industrial and outdoor lighting inputs including 12V/24V/36V systems. |
| Switching Frequency | Fixed 400kHz (365–450kHz range); enables compact magnetics and low EMI compliant with EN55015 radiated emissions limits. |
| Efficiency | Up to 96% at 350mA/24V input driving 6–10 LEDs; optimized for high-power LED strings with minimal thermal derating. |
| Dimming Capability | PWM dimming with 16µs minimum on-time; supports 256-step resolution at 240Hz for high-contrast lighting control. |
| Thermal Performance | θJA = 19.3°C/W (4-layer PCB); junction-to-case θJC = 1.9°C/W; thermal shutdown at 170°C with 10°C hysteresis. |
| Package Dimensions | 10.16 × 13.77 × 4.57 mm (0.4 × 0.39 × 0.18 in); 7-pin TO-PMOD (NDW) with exposed thermal pad tied to GND. |
Pinout & Package
TPS92550TZ/NOPB uses a 7-pin TO-PMOD (NDW) package with an exposed thermal pad (EP) that must be soldered directly to GND for thermal and electrical integrity. The package measures 10.16 mm × 13.77 mm × 4.57 mm and is RoHS-compliant with Sn lead finish and MSL Level-3 rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 - LED+ | Anode supply rail | High-current input node connecting to LED string anode; accepts up to 40V and carries full LED current (≤450mA). |
| 3 - DIM | Digital dimming control | Logic-level PWM input (0–5.5V); open or >1.2V enables operation; <0.7V disables switching while maintaining VCC regulation. |
| 4 - GND | Reference ground | Primary signal and power return; must be connected to exposed pad (EP) externally for thermal and noise performance. |
| 5 - VREF | Internal voltage reference | 1.2V output used for precision current setting when paired with RVREF resistor; not intended as general-purpose reference. |
| 6 - IADJ | LED current trim | Connects to GND via resistor (0–499Ω) to set 300–350mA; or left open with RVREF = 10.5kΩ for 450mA factory-adjusted mode. |
| 7 - LED− | LED string return | Current-sink output node tied to LED cathode; senses output current internally-no external sense resistor required. |
| EP - Exposed Pad | Thermal & ground plane | Must be soldered to solid GND copper area with ≥35 thermal vias; critical for thermal dissipation (θJC = 1.9°C/W) and EMI suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated power inductor | Eliminates external magnetics and compensation network-reduces BOM count and layout sensitivity while ensuring consistent EMI behavior. |
| EN55015-compliant EMI | Meets Class B radiated emissions limits (10m distance) with only 2.2µF CIN and 2.2µF COUT ceramic capacitors-no ferrite beads or shielding required. |
| Parallel operation support | Multiple TPS92550TZ/NOPB modules can drive same LED string asynchronously; total current sums (e.g., 2× = 900mA), with ripple filtered by local COUT. |
| No external current sense | Internal current regulation eliminates RSENSE, reducing power loss, board space, and thermal drift errors across temperature (–40°C to +125°C). |
| Robust protection suite | Includes LED open-circuit detection, LED short-circuit limiting (900mA typical), input UVLO (4.2V typ), and thermal shutdown with hysteresis. |
Applications
| Architectural Recessed Lighting | Outdoor Street Lamps |
|---|---|
|
Use Scenario: High-CRI LED modules embedded in ceiling cavities requiring flicker-free, thermally stable illumination with smooth 0–100% dimming. IC Role / Device Role / Timing Role: Constant-current buck regulator providing precise 350mA drive to 6–10-series white LEDs; handles 24–36V DC input from centralized PoE or AC/DC supplies. Use Value: Delivers 96% efficiency and <±3.6% current accuracy across ambient temperatures, minimizing lumen shift and enabling long-life thermal design without active cooling. |
Use Scenario: Solar-charged battery-powered streetlights operating across wide input (12–36V) and ambient temperature (–40°C to +85°C) ranges. IC Role / Device Role / Timing Role: Primary LED driver managing 450mA current to high-lumen LED strings; UVLO prevents brownout operation; thermal shutdown protects against enclosure overheating. Use Value: Enables single-driver solution for 14W output with no external sense resistor-reducing failure points and simplifying IP66-rated outdoor PCB layout. |
| Commercial Desk Lamps | Underwater Accent Lighting |
|
Use Scenario: Dimmable task lighting with touch or BLE-controlled PWM dimming requiring high contrast ratio and zero-flicker performance. IC Role / Device Role / Timing Role: PWM-controlled current sink accepting 240Hz logic-level signals; supports 16µs minimum pulse width for >256-step brightness resolution. Use Value: Achieves flicker-free dimming down to 0.4% intensity without color shift-critical for human-centric lighting in office environments. |
Use Scenario: Sealed underwater fixtures where reliability, corrosion resistance, and thermal management under confined enclosures are critical. IC Role / Device Role / Timing Role: Isolated-current LED driver with integrated inductor and GND-referenced EP pad-minimizes leakage paths and simplifies potting compatibility. Use Value: Eliminates external high-power components prone to moisture ingress; exposed pad soldered to GND plane enhances conduction cooling in epoxy-filled housings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar constant-current buck LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3409HVMM/NOPB | External MOSFET + inductor required; adjustable 100kHz–1MHz frequency; no integrated inductor or VREF; requires external current sense. | Higher design flexibility for custom thermal/EMI layouts but increases BOM, layout complexity, and validation effort. | Select when needing >450mA, variable frequency, or multi-topology support (buck-boost/SEPIC); not drop-in-requires full redesign. |
| AL8862SP-13 | 40V max input; 1.3A max output; requires external inductor and sense resistor; 500kHz switching; no integrated VREF or IADJ trim. | Better suited for high-current (>600mA), lower-voltage (<24V) applications; lacks fine dimming resolution and thermal shutdown hysteresis. | Choose for cost-sensitive, high-volume 12V LED strips where 450mA is insufficient and integrated inductor is not mandatory. |
Compared with LM3409HVMM/NOPB and AL8862SP-13, the TPS92550TZ/NOPB offers turnkey integration-reducing design cycle time by eliminating loop compensation, magnetics selection, and current-sense calibration-while delivering superior dimming fidelity and EMI compliance out-of-box.
Availability
TPS92550TZ/NOPB is available at Aetrix Electronics and suitable for architectural lighting, outdoor street lamps, and commercial desk lamp designs requiring stable component supply, long-lifecycle assurance, and production-ready thermal/EMI performance.
Supply support for TPS92550TZ/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 ICs, with decades of expertise in LED driver innovation and automotive-grade reliability.
The TPS92550TZ/NOPB belongs to TI's high-power LED micro-module product line, engineered to simplify thermal and EMI-critical lighting designs by integrating magnetics, control, and protection into a single surface-mount package.
FAQ
What is the maximum LED string voltage supported by the TPS92550TZ/NOPB?
The TPS92550TZ/NOPB supports LED strings up to 36V forward voltage when operating from a 36V input, enabling up to 10-series white LEDs (3.2V typical VF). Its buck architecture requires VIN > VLED + dropout; minimum input is 4.5V, so practical VLED max is ~32V at lower inputs. Absolute max LED+ to LED− is 40V per absolute ratings.
Can the TPS92550TZ/NOPB operate without an external current-sense resistor?
Yes-the TPS92550TZ/NOPB uses internal current regulation and requires no external sense resistor. LED current is set either by grounding the IADJ pin (350mA default) or using external resistors on IADJ and/or VREF to achieve 300mA or 450mA. This eliminates power loss, layout sensitivity, and drift associated with discrete sense elements.
How does the TPS92550TZ/NOPB handle thermal management in enclosed fixtures?
The TPS92550TZ/NOPB relies on its exposed thermal pad (EP) soldered directly to a GND plane with ≥35 thermal vias for conduction cooling. With θJC = 1.9°C/W and thermal shutdown at 170°C (10°C hysteresis), it sustains 450mA continuous output in well-designed 4-layer PCBs-even in sealed enclosures-without forced airflow.
Is the TPS92550TZ/NOPB compatible with EN55015 radiated emissions requirements?
Yes-the TPS92550TZ/NOPB meets EN55015 Class B radiated emissions limits (10m distance, horizontal/vertical polarization) when used with 2.2µF CIN and 2.2µF COUT ceramic capacitors, as verified in Figures 38–39 of the SNVS806C datasheet. No additional filtering or shielding is required for compliance.
What happens if the LED string opens during operation of the TPS92550TZ/NOPB?
The TPS92550TZ/NOPB detects LED open-circuit conditions and shuts down switching while maintaining VCC regulation. The DIM pin remains functional, and the device resumes normal operation automatically once the fault is cleared-preventing voltage runaway and protecting downstream components.
TPS92550TZ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-PMOD-7, Power Module
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Down (Buck)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 4.5V
- Voltage - Supply (Max):
- 36V
- Voltage - Output:
- -
- Current - Output / Channel:
- 450mA
- Frequency:
- 400kHz
- Dimming:
- PWM
- Applications:
- Lighting
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-PMOD-7
TPS92550TZ/NOPB FAQ
1.How can I place an order for TPS92550TZ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS92550TZ/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 TPS92550TZ/NOPB reliable?
The price and inventory of TPS92550TZ/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS92550TZ/NOPB is usually 5 days.
3.What payment methods are accepted for TPS92550TZ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS92550TZ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS92550TZ/NOPB?
TPS92550TZ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS92550TZ/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 TPS92550TZ/NOPB?
For technical support, including TPS92550TZ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS92550TZ/NOPB requirements.
6.How does Aetrix verify that TPS92550TZ/NOPB is sourced from the original manufacturer or authorized distributors?
All TPS92550TZ/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 TPS92550TZ/NOPB meets industry standards.
7.What is the process for return or replacement of TPS92550TZ/NOPB?
All TPS92550TZ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with TPS92550TZ/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 TPS92550TZ/NOPB part is unused and in its original packaging.
Return procedure for TPS92550TZ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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