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Texas Instruments TPS92551TZ/NOPB
- Part No.:
- TPS92551TZ/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- TO-PMOD-7, Power Module
- Datasheet:
-
TPS92551TZ/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 450MA 7PMOD
- Quantity:
- Payment:
- Shipping:
Inventory:178
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Product details
Overview
TPS92551TZ/NOPB from Texas Instruments is a 450mA constant-current buck LED driver micro-module integrating power inductor, MOSFET, and controller in a single 7-pin PFM package. It delivers up to 23W into a single LED string (up to 16 LEDs at 60V input), operates at 800kHz fixed switching frequency, achieves ±3.5% LED current accuracy, and supports PWM dimming with <16µs minimum pulse width for high-contrast lighting control in architectural and street lighting.
For engineers reviewing the TPS92551TZ/NOPB datasheet, TPS92551TZ/NOPB pinout, TPS92551TZ/NOPB application, or TPS92551TZ/NOPB equivalent, key selection considerations include its integrated inductor architecture, 4.5V–60V wide input range, thermal shutdown protection, EN55015-compliant EMI performance, and parallel operation capability for >450mA loads.
Technical Context
The TPS92551TZ/NOPB implements a floating buck topology with internal high-side power switch and no external current-sense resistor. Its control loop regulates average LED current directly via IADJ and VREF pins, enabling factory-set (350mA) or adjustable (300–450mA) output without compensation components.
It features fast dimming response with 256-step PWM resolution at 240Hz, input under-voltage lockout (UVLO), LED open/short-circuit protection, and thermal shutdown at 170°C. The 7-pin TO-PMOD (NDW) package includes an exposed thermal pad tied to GND for θJA = 20°C/W on a 4-layer board.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LED Current | Adjustable 300–450mA; ±3.5% typical accuracy over –40°C to +125°C junction temperature. |
| Input Voltage Range | 4.5V to 60V DC; supports wide-range industrial and outdoor lighting inputs including 12V, 24V, 48V, and 60V systems. |
| Switching Frequency | Fixed 800kHz (720–920kHz range); enables compact magnetics and low EMI compliant with EN55015. |
| Max Output Power | 23W (at 450mA × ~51V LED string voltage); drives up to 16 LEDs in series at 60V input. |
| Dimming Capability | PWM dimming with <16µs minimum pulse width; yields high contrast ratio and fine brightness control down to 0.1% duty cycle. |
| Efficiency | Up to 95% at 350mA; optimized across input voltage and LED string length (1–16 LEDs). |
| Thermal Protection | Thermal shutdown at 170°C with 10°C hysteresis; junction temperature rated from –40°C to +125°C. |
Pinout & Package
TPS92551TZ/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 connected to GND for optimal thermal performance (θJC = 1.9°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 - LED+ | Anode supply rail | Connects to positive terminal of LED string and input capacitor; carries full input current (IIN). |
| 3 - DIM | PWM dimming input | Logic-level control: open or >1.3V enables operation; <0.7V disables switching while keeping VCC regulator active. |
| 4 - GND | Reference ground | System ground reference; must be connected to exposed pad (EP) externally for thermal and electrical integrity. |
| 5 - VREF | Voltage reference output | Internal 1.2V reference; used with external resistor to adjust LED current upward to 450mA. |
| 6 - IADJ | LED current adjustment | Connect to GND for factory 350mA setting; add resistor to GND to reduce current to 300mA (499Ω) or increase to 450mA (via VREF). |
| 7 - LED− | LED string return | Cathode return path for regulated LED current; connects directly to LED string cathode. |
| EP - Exposed Pad | Thermal & ground interface | Mandatory GND connection; primary heat dissipation path; improves θJA by >30% vs. non-connected pad. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated power inductor | Eliminates external inductor selection, layout sensitivity, and EMI filter complexity-reduces BOM count and design cycle time. |
| Wide 4.5V–60V input range | Supports universal AC/DC adapter outputs, battery-backed systems, and unregulated industrial rails without pre-regulation. |
| EN55015-compliant EMI | Passes radiated emissions testing (10m distance, 3m/1m height) with only 2.2µF CIN and COUT, reducing filtering component count. |
| Parallel operation support | Multiple TPS92551TZ/NOPB modules can drive same LED string asynchronously; total current scales linearly (e.g., two units = 900mA). |
| No external current sense | Removes shunt resistor, associated power loss, and PCB trace sensitivity-improves efficiency and long-term current stability. |
Applications
| Architectural Recessed Lighting | Outdoor Street Lamps |
|---|---|
|
Use Scenario: High-efficiency, thermally robust LED driver for recessed downlights in commercial ceilings requiring precise dimming and long life. IC Role / Device Role / Timing Role: Constant-current buck micro-module regulating 350–450mA into 6–12 LED strings; provides stable current despite line and temperature variation. Use Value: Delivers 95% efficiency and <16µs PWM dimming for flicker-free 256-step control-enabling smooth DALI/0–10V dimming integration without external controllers. |
Use Scenario: Outdoor LED street lamp driver operating in wide ambient temperatures (–40°C to +85°C ambient) with surge-prone AC/DC supplies. IC Role / Device Role / Timing Role: Primary LED current regulator with UVLO, thermal shutdown, and LED short-circuit protection-ensuring fail-safe operation during grid transients. Use Value: Withstands 60V input and integrates EMI filtering per EN55015, eliminating need for external chokes and simplifying IP66-rated enclosure design. |
| Commercial Desk & Cabinet Lighting | Underwater Accent Lighting |
|
Use Scenario: Compact, low-noise LED driver for premium desk lamps and display cabinet lighting where acoustic noise and EMI must be minimized. IC Role / Device Role / Timing Role: Fixed-frequency (800kHz) buck controller driving 300–450mA strings; eliminates audible coil whine and reduces conducted EMI. Use Value: Achieves quiet operation and passes Class B EMI limits with minimal external capacitance-ideal for office and retail environments near sensitive audio equipment. |
Use Scenario: Sealed underwater LED fixture requiring high reliability, corrosion-resistant layout, and thermal resilience in confined enclosures. IC Role / Device Role / Timing Role: Thermally optimized micro-module with exposed pad GND connection and 125°C max junction rating-maintains regulation under sustained high ambient. Use Value: Integrated inductor and minimal external components reduce seal-point count and PCB area-lowering risk of moisture ingress and improving MTBF. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar constant-current LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3409HVMM/NOPB | External inductor required; 1.25A max output; adjustable 200kHz–1MHz frequency; no integrated VREF/IADJ current programming. | Requires external current sense and compensation network; better suited for higher-current (>450mA), variable-frequency designs needing layout flexibility. | Choose LM3409HVMM/NOPB when system-level thermal management allows discrete inductor placement and higher peak current is needed. |
| LT3761EFE#PBF | 40V max input; 3A max LED current; requires external MOSFET and inductor; supports analog + PWM dimming; no integrated inductor. | Targets high-power stage lighting and automotive headlamps; lacks EN55015 compliance out-of-box and needs additional EMI filtering. | Choose LT3761EFE#PBF for designs requiring >450mA with programmable fault thresholds and multi-string capability-not for space-constrained, turnkey micro-module use. |
Compared with LM3409HVMM/NOPB and LT3761EFE#PBF, the TPS92551TZ/NOPB offers faster time-to-market via integrated inductor and simplified layout, but trades off maximum current and input voltage headroom for compactness and EMI-certified operation.
Availability
TPS92551TZ/NOPB is available at Aetrix Electronics and suitable for architectural lighting, outdoor street lamps, and commercial display lighting requiring stable component supply, long-lifecycle assurance, and RoHS-compliant manufacturing.
Supply support for TPS92551TZ/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 high-reliability industrial solutions.
The TPS92551TZ/NOPB belongs to TI's LED Micro-Module family, designed specifically for turnkey, high-efficiency constant-current LED drivers targeting space-constrained, thermally demanding, and EMI-sensitive lighting applications.
FAQ
What is the maximum number of LEDs the TPS92551TZ/NOPB can drive in series?
The TPS92551TZ/NOPB can drive 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 supported count decreases-for example, 10 LEDs at 48V input. The device's 60V absolute maximum LED+–GND rating defines the upper limit.
Does the TPS92551TZ/NOPB require external current-sense resistors?
No, the TPS92551TZ/NOPB does not require external current-sense resistors. It uses an internal sensing scheme and direct current regulation via the IADJ and VREF pins. This eliminates power loss, layout sensitivity, and calibration drift associated with external shunts-enhancing long-term accuracy and efficiency.
Can multiple TPS92551TZ/NOPB modules be operated in parallel?
Yes, TPS92551TZ/NOPB modules can be connected in parallel with shared VIN and GND to deliver higher total LED current (e.g., two units yield ~900mA). They operate asynchronously, so low-frequency current ripple may occur-mitigated by adding ≥2.2µF COUT per module near the LED terminals.
What is the purpose of the exposed pad (EP) on the TPS92551TZ/NOPB package?
The exposed pad (EP) on the TPS92551TZ/NOPB is a thermal and electrical interface that must be soldered directly to a GND plane. It provides the primary heat conduction path from the die to the PCB, achieving θJC = 1.9°C/W and reducing θJA to 20°C/W-critical for maintaining ≤125°C junction temperature at full 23W load.
How is LED current adjusted on the TPS92551TZ/NOPB?
LED current on the TPS92551TZ/NOPB is adjusted using two methods: (1) Connect IADJ to GND for factory-set 350mA; (2) Add a resistor between IADJ and GND to scale down to 300mA (499Ω), or combine with VREF and external resistor to scale up to 450mA. No external op-amps or DACs are required.
TPS92551TZ/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
TPS92551TZ/NOPB FAQ
1.How can I place an order for TPS92551TZ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS92551TZ/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 TPS92551TZ/NOPB reliable?
The price and inventory of TPS92551TZ/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS92551TZ/NOPB is usually 5 days.
3.What payment methods are accepted for TPS92551TZ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS92551TZ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS92551TZ/NOPB?
TPS92551TZ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS92551TZ/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 TPS92551TZ/NOPB?
For technical support, including TPS92551TZ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS92551TZ/NOPB requirements.
6.How does Aetrix verify that TPS92551TZ/NOPB is sourced from the original manufacturer or authorized distributors?
All TPS92551TZ/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 TPS92551TZ/NOPB meets industry standards.
7.What is the process for return or replacement of TPS92551TZ/NOPB?
All TPS92551TZ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with TPS92551TZ/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 TPS92551TZ/NOPB part is unused and in its original packaging.
Return procedure for TPS92551TZ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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