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Texas Instruments TPS92551TZX/NOPB
- Part No.:
- TPS92551TZX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- TO-PMOD-7, Power Module
- Datasheet:
-
TPS92551TZX/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 450MA 7PMOD
- Quantity:
- Payment:
- Shipping:
Inventory:4,109
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Product details
Overview
TPS92551TZX/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 95% efficiency, supporting up to 16-series LEDs (23W max) with 800kHz fixed-frequency switching and ±3.5% LED current accuracy. It integrates the power inductor and operates across 4.5V–60V input for architectural lighting and street lamps.
For engineers reviewing the TPS92551TZX/NOPB datasheet, TPS92551TZX/NOPB pinout, TPS92551TZX/NOPB application, or TPS92551TZX/NOPB equivalent, key selection criteria include its integrated inductor architecture, PWM dimming down to 16µs pulse width, thermal shutdown at 170°C, EN55015-compliant EMI performance, and parallel operation capability for >450mA loads.
Technical Context
The TPS92551TZX/NOPB implements a floating buck topology with internal high-side MOSFET switch and no external current-sense resistor. Its control loop delivers fast transient response enabling 256-step PWM dimming at 240Hz with <16µs minimum on-time.
It features built-in protections including LED open/short-circuit detection, input UVLO (4.5V), thermal shutdown (170°C), and overcurrent limiting triggered at ~3× set LED current. The VREF pin provides a stable 1.2V reference for external monitoring or feedback scaling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LED Current | Adjustable 300–450mA via IADJ or VREF resistor; factory-set default is 350mA with ±3.5% accuracy over –40°C to +125°C junction temp. |
| Input Voltage Range | 4.5V–60V DC - supports wide-range industrial and outdoor lighting inputs including 12V, 24V, 48V, and 60V systems. |
| Switching Frequency | Fixed 800kHz (±10%) - enables compact passive filtering and low EMI per EN55015 with minimal output ripple. |
| Efficiency | Up to 95% at 350mA/48V input - reduces thermal load and simplifies heatsinking in enclosed luminaires. |
| Dimming Resolution | 256-step PWM at 240Hz with 16µs minimum pulse width - achieves high contrast ratio (>1000:1) for precise brightness control. |
| Thermal Performance | θJA = 19.3°C/W (4-layer PCB); θJC = 1.9°C/W - exposed pad must be connected directly to GND for optimal heat dissipation. |
| Protection Features | LED open/short, input UVLO, thermal shutdown (170°C with 10°C hysteresis), and internal switch current limit - eliminates need for external fault management circuitry. |
Pinout & Package
TPS92551TZX/NOPB uses a 7-pin TO-PMOD (NDW) package measuring 10.2 × 13.8 × 4.6 mm with an exposed thermal pad (EP) that must be soldered directly to GND for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 - LED+ | Anode supply rail | High-current input node connecting to LED string anode; shares VIN path and requires low-impedance layout to minimize voltage drop. |
| 3 - DIM | PWM dimming control | Logic-level input (0–5.5V) with internal pull-up; open or >1.3V enables operation; <0.7V disables switching while maintaining VCC regulation. |
| 4 - GND | Reference ground | Primary signal and power return; must be tied to exposed pad (EP) externally for thermal conduction and noise immunity. |
| 5 - VREF | Voltage reference output | Stable 1.2V reference used to set LED current via external resistor; also serves as diagnostic monitor point. |
| 6 - IADJ | LED current adjustment | Current-sink node where resistor to GND sets LED current from 300mA (500Ω) to 450mA (open or 10.5kΩ on VREF). |
| 7 - LED− | LED string return | High-current cathode return path; connects directly to LED string cathode and forms regulated current sink node. |
| EP - Exposed Pad | Thermal & electrical ground | Must be soldered to solid GND plane; provides primary thermal path (θJC = 1.9°C/W) and reduces EMI coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated power inductor | Eliminates external magnetics, reduces BOM count by ≥4 components, and ensures consistent performance across production units. |
| EN55015-compliant EMI | Passes radiated emissions testing (10m distance, 3m/1m height) without ferrite beads or shielding - cuts EMC debug time and cost. |
| Parallel operation support | Multiple TPS92551TZX/NOPB modules can drive same LED string with additive current (e.g., 2× = 900mA); local CIN/COUT required per module. |
| Ultra-fast dimming response | 16µs minimum PWM on-time enables high-contrast dimming in architectural and stage lighting without visible flicker or step artifacts. |
| Wide temperature range | Rated for –40°C to +125°C junction operation - suitable for outdoor street lamps, automotive exterior lighting, and industrial high-temp enclosures. |
Applications
| Architectural Recessed Lighting | Outdoor Street Lamps |
|---|---|
|
Use Scenario: High-efficiency linear LED modules embedded in ceiling cavities for commercial office buildings. IC Role / Device Role / Timing Role: Constant-current buck regulator providing stable 350mA drive to 12-series white LEDs under 48V DC input. Use Value: Integrated inductor eliminates layout-sensitive external components, reducing board area by 35% and improving thermal reliability in confined spaces. |
Use Scenario: Solar-powered or grid-connected LED luminaires mounted on utility poles in municipal infrastructure. IC Role / Device Role / Timing Role: Primary LED driver handling 4.5–60V input transients and delivering 450mA to 16-series high-lumen LEDs. Use Value: UVLO and thermal shutdown ensure fail-safe operation during voltage surges or ambient temperatures up to 65°C, extending field life. |
| Underwater Pool Lighting | Decorative Cabinet Accent Lighting |
|
Use Scenario: IP68-rated submerged LED fixtures requiring corrosion-resistant, high-reliability drive electronics. IC Role / Device Role / Timing Role: Isolated current sink regulating 300mA through 8-series blue LEDs with PWM dimming synchronized to RGB controllers. Use Value: 16µs dimming pulse width enables smooth color transitions and eliminates strobing in slow-motion video capture. |
Use Scenario: Low-profile under-cabinet LED strips in residential kitchens with adjustable brightness and warm-dim functionality. IC Role / Device Role / Timing Role: Compact micro-module driving 6-series 3.2V LEDs from 12V input with analog-adjustable current via IADJ resistor. Use Value: TO-PMOD package fits tight mechanical envelopes (<5mm height), and ceramic capacitor compatibility avoids electrolytic aging issues. |
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 inductor required; 1.25MHz switching; no integrated VREF; ±5% LED current accuracy. | Requires additional compensation network and current-sense resistor; less suited for space-constrained designs. | Choose when higher frequency (1.25MHz) or adjustable frequency is needed, and board area allows external magnetics. |
| LT3761EFE#PBF | External MOSFET driver; supports SEPIC/buck-boost; 100V input rating; ±1.5% current accuracy. | Enables >60V input and flexible topology but adds gate drive complexity and external FET losses. | Prefer for ultra-wide input (up to 100V) or multi-topology flexibility; avoid if simplicity and integration are top priorities. |
Compared with LM3409HVMM/NOPB and LT3761EFE#PBF, the TPS92551TZX/NOPB offers superior integration (no inductor, no sense resistor), tighter current accuracy (±3.5% vs ±5%/±1.5%), and lower system-level EMI - making it optimal for cost-sensitive, space-constrained, and EMC-critical lighting applications.
Availability
TPS92551TZX/NOPB is available at Aetrix Electronics and suitable for architectural recessed lighting, outdoor street lamps, underwater pool lighting, and decorative cabinet accent lighting requiring stable component supply and long-term production continuity.
Supply support for TPS92551TZX/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 TPS92551 product line delivers fully integrated, high-efficiency LED drivers targeting commercial and industrial lighting systems where size, thermal performance, and regulatory compliance are critical design constraints.
FAQ
What is the maximum number of LEDs the TPS92551TZX/NOPB can drive in series?
The TPS92551TZX/NOPB supports up to 16 LEDs in series at 60V input, assuming typical forward voltage of 3.2V per LED (51.2V total). At lower input voltages, the count scales accordingly - e.g., 10 LEDs at 48V. The device's 60V absolute maximum LED+–LED− rating defines the upper limit.
Does the TPS92551TZX/NOPB require an external current-sense resistor?
No, the TPS92551TZX/NOPB does not require an external current-sense resistor. LED current is regulated internally using proprietary sensing and control circuitry. Current adjustment is achieved solely via external resistors on IADJ or VREF pins, eliminating power loss and layout sensitivity associated with shunt resistors.
Can multiple TPS92551TZX/NOPB modules be operated in parallel?
Yes, TPS92551TZX/NOPB modules can be connected in parallel with shared VIN and GND to deliver higher total LED current (e.g., 900mA with two units). Each module requires its own local 2.2µF CIN capacitor, and a shared 2.2µF COUT across the LED string minimizes low-frequency ripple caused by asynchronous switching.
What is the minimum PWM dimming pulse width supported by the TPS92551TZX/NOPB?
The TPS92551TZX/NOPB supports a minimum PWM dimming pulse width of 16µs, enabling high-contrast ratio dimming (>1000:1) at 240Hz. This specification is verified across –40°C to +125°C junction temperature and is independent of input voltage or LED string configuration.
Is the exposed thermal pad (EP) on the TPS92551TZX/NOPB electrically connected to GND?
Yes, the exposed thermal pad (EP) on the TPS92551TZX/NOPB is internally connected to GND and must be soldered directly to a GND plane on the PCB. This connection is mandatory for both thermal performance (θJC = 1.9°C/W) and electrical stability - floating or unconnected EP degrades efficiency and may cause EMI or thermal shutdown.
TPS92551TZX/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):
- 60V
- Voltage - Output:
- -
- Current - Output / Channel:
- 450mA
- Frequency:
- 800kHz
- Dimming:
- PWM
- Applications:
- Lighting
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-PMOD-7
TPS92551TZX/NOPB FAQ
1.How can I place an order for TPS92551TZX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS92551TZX/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 TPS92551TZX/NOPB reliable?
The price and inventory of TPS92551TZX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS92551TZX/NOPB is usually 5 days.
3.What payment methods are accepted for TPS92551TZX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS92551TZX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS92551TZX/NOPB?
TPS92551TZX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS92551TZX/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 TPS92551TZX/NOPB?
For technical support, including TPS92551TZX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS92551TZX/NOPB requirements.
6.How does Aetrix verify that TPS92551TZX/NOPB is sourced from the original manufacturer or authorized distributors?
All TPS92551TZX/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 TPS92551TZX/NOPB meets industry standards.
7.What is the process for return or replacement of TPS92551TZX/NOPB?
All TPS92551TZX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with TPS92551TZX/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 TPS92551TZX/NOPB part is unused and in its original packaging.
Return procedure for TPS92551TZX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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