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Texas Instruments TPS92550TZX/NOPB
- Part No.:
- TPS92550TZX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- TO-PMOD-7, Power Module
- Datasheet:
-
TPS92550TZX/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 450MA 7PMOD
- Quantity:
- Payment:
- Shipping:
Inventory:4,600
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Product details
Overview
TPS92550TZX/NOPB from Texas Instruments is a 7-pin integrated buck LED driver micro-module delivering up to 450mA constant current at up to 14W (36V input, 10-LED string), with ±3.6% LED current accuracy, 400kHz fixed switching frequency, and EN55015-compliant low EMI. It drives high-power single-string LED lighting in street lamps, architectural recessed lights, and underwater fixtures.
For engineers reviewing the TPS92550TZX/NOPB datasheet, TPS92550TZX/NOPB pinout, TPS92550TZX/NOPB application, or TPS92550TZX/NOPB equivalent, key selection considerations include its integrated power inductor, 4.5V–36V input range, 16µs minimum PWM dimming pulse width, thermal shutdown at 170°C, and compatibility with ceramic input/output capacitors.
Technical Context
The TPS92550TZX/NOPB implements a floating synchronous buck topology with an integrated MOSFET switch, power inductor, and control logic-eliminating external current-sense resistors and loop compensation components. Its internal 1.2V reference feeds the VREF pin and enables precise LED current setting via IADJ resistor or RVREF network.
Operation relies on constant-frequency peak-current-mode control with built-in protections: LED open/short-circuit detection, input UVLO (4.5V threshold), and thermal shutdown with 10°C hysteresis. The DIM pin accepts logic-level PWM signals (1.2V threshold, 0.25V hysteresis) for high-contrast dimming down to 16µs pulse width at 240Hz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LED Current Range | 300–450mA adjustable via external resistor; factory preset at 350mA (±3.6% typical accuracy over –40°C to +125°C). |
| Input Voltage Range | 4.5V–36V DC; supports wide-range industrial and outdoor lighting inputs including 12V/24V/36V battery or AC-DC rails. |
| Switching Frequency | Fixed 400kHz (±10%); enables compact magnetics, reduces audible noise, and simplifies EMI filtering per EN55015. |
| Efficiency | Up to 96% at 350mA/24V input driving 6–10 LEDs; optimized for high-power LED strings with minimal thermal derating. |
| Dimming Resolution | 256-step PWM dimming at 240Hz; minimum 16µs on-time enables >10,000:1 contrast ratio in precision lighting control. |
| Thermal Performance | θJA = 19.3°C/W (4-layer PCB, 35 vias); junction-to-case θJC = 1.9°C/W; thermal shutdown at 170°C with 10°C hysteresis. |
| EMI Compliance | Meets EN55015 radiated emissions limits (horizontal/vertical, 10m distance) with standard 2.2µF CIN/COUT ceramic capacitors. |
Pinout & Package
TPS92550TZX/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 directly to GND for optimal thermal performance and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1,2 LED+ | Anode supply rail | High-side connection point for LED string anode; carries full LED current and input voltage (4.5–36V). |
| 3 DIM | PWM dimming input | Logic-controlled enable/disable pin with 1.2V rising threshold and 0.25V hysteresis; open or high = enabled. |
| 4 GND | Ground reference | Primary ground return for control circuitry; must be tied to EP for thermal and noise integrity. |
| 5 VREF | Internal voltage reference | 1.2V output used to set LED current via external RVREF resistor; requires no load for stable operation. |
| 6 IADJ | Current adjustment node | Connects to ground via RIADJ resistor to fine-tune LED current from 300mA to 450mA; 0Ω = 350mA default. |
| 7 LED- | LED string cathode return | Low-side current sink terminal; returns regulated LED current to ground through internal power stage. |
| EP | Exposed thermal pad | Electrically and thermally connected to GND; mandatory for thermal dissipation and EMI suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated power inductor | Eliminates external magnetics, reduces BOM count, and ensures consistent performance across temperature and production lots. |
| Wide input voltage range | 4.5V–36V operation supports universal input for indoor/outdoor LED lighting without auxiliary regulation stages. |
| EN55015-compliant EMI | Passes radiated emissions testing with only two 2.2µF X7R ceramic capacitors (CIN/COUT), simplifying compliance validation. |
| Fast PWM dimming | 16µs minimum pulse width enables high-contrast, flicker-free dimming essential for architectural and display lighting. |
| Robust protection suite | Includes thermal shutdown (170°C), LED open/short detection, input UVLO, and internal switch current limiting (3× ILED). |
Applications
| Street Lighting | Architectural Recessed Lights |
|---|---|
|
Use Scenario: Outdoor pole-mounted luminaires operating continuously under variable ambient temperatures and line-voltage fluctuations. IC Role / Device Role / Timing Role: Constant-current buck regulator providing stable 350–450mA drive to 6–10 high-brightness white LEDs in series. Use Value: Delivers 96% efficiency and thermal shutdown at 170°C to sustain reliability in unventilated enclosures with ambient temperatures up to 85°C. |
Use Scenario: Commercial ceiling-recessed downlights requiring smooth, high-contrast dimming for ambiance control. IC Role / Device Role / Timing Role: High-resolution PWM-controlled LED driver enabling 256-step brightness control at 240Hz without visible flicker. Use Value: Achieves >10,000:1 contrast ratio using 16µs dimming pulses-critical for museum-grade and hospitality lighting applications. |
| Underwater LED Fixtures | Industrial Cabinet Lamps |
|
Use Scenario: Sealed underwater housings for pool, fountain, or marine signage where moisture ingress and thermal buildup are critical concerns. IC Role / Device Role / Timing Role: Fully integrated micro-module eliminating external sense resistors and compensation networks-reducing failure points in humid environments. Use Value: Exposed thermal pad (EP) tied to GND provides direct heat conduction path, maintaining junction temperature below 125°C even at full 450mA load. |
Use Scenario: Machine-tool cabinet illumination requiring robust operation across wide input voltage swings (e.g., 12–36V DC bus). IC Role / Device Role / Timing Role: Wide-input buck LED driver supporting direct connection to industrial DC rails without pre-regulation. Use Value: 4.5V–36V input range accommodates brownout conditions and battery sag while maintaining constant LED current regulation. |
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 | Adjustable 1.25V current-sense threshold; requires external inductor and compensation; 1.25MHz switching frequency. | Higher-frequency operation suits smaller magnetics but increases EMI design complexity; lacks integrated inductor and VREF output. | Choose when board space permits discrete magnetics and higher switching frequency is preferred over turnkey integration. |
| LT3761EFE#PBF | 40V max input; 3.2V reference; requires external current-sense resistor and compensation; supports boost/buck-boost topologies. | Broader topology flexibility but adds design overhead; no integrated inductor or factory-set current option. | Prefer when multi-topology support (e.g., boost for low-VIN strings) or tighter current tolerance (<±1.5%) is required. |
Compared with LM3409HVMM/NOPB and LT3761EFE#PBF, the TPS92550TZX/NOPB offers faster time-to-market via full integration-including inductor, reference, and protection-while trading off topology flexibility and ultra-high current accuracy for simplified layout, lower EMI risk, and guaranteed thermal performance in sealed enclosures.
Availability
TPS92550TZX/NOPB is available at Aetrix Electronics and suitable for street lighting, architectural recessed lights, and underwater LED fixtures requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for TPS92550TZX/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 TPS92550TZX/NOPB belongs to TI's LED Micro-Module family-designed specifically for high-efficiency, low-EMI, single-string LED lighting in demanding industrial and outdoor environments where integration, thermal robustness, and regulatory compliance are critical.
FAQ
What is the maximum LED string voltage supported by the TPS92550TZX/NOPB?
The TPS92550TZX/NOPB supports LED strings up to 36V forward voltage when operating from a 36V input, enabling up to 10 LEDs (at ~3.2V each) in series. Its buck architecture requires VIN > VLED for regulation; minimum input headroom is defined by internal switch drop and control margin, verified to sustain 450mA at 36V VLED with 36V VIN.
Can the TPS92550TZX/NOPB be used in parallel for higher current output?
Yes-the TPS92550TZX/NOPB supports parallel operation to deliver >450mA total LED current. Modules share common VIN and GND, acting as independent asynchronous current sinks. Total current is additive, but low-frequency ripple may occur due to unsynchronized switching; adding ≥2.2µF COUT per module suppresses this effect and yields stable DC output.
What capacitor types are recommended for CIN and COUT with the TPS92550TZX/NOPB?
The TPS92550TZX/NOPB is explicitly validated with 2.2µF, 100V X7R ceramic capacitors for both CIN and COUT-mounted close to VIN/GND and LED+/LED− respectively. These capacitors ensure EN55015 compliance, minimize di/dt loop area, and support stable operation across –40°C to +125°C. Low-ESR tantalum or polymer alternatives are not recommended due to EMI and reliability risks.
How is LED current adjusted on the TPS92550TZX/NOPB?
LED current on the TPS92550TZX/NOPB is set by connecting a resistor between IADJ (Pin 6) and GND: 0Ω yields 350mA (factory default), 499Ω yields 300mA, and shorting IADJ to GND with RVREF = 10.5kΩ yields 450mA. The relationship is linear and documented in TI's SNVS806C datasheet Figure 31 and Table 1.
Does the TPS92550TZX/NOPB require external compensation components?
No-the TPS92550TZX/NOPB is a fully integrated micro-module with internal compensation. It requires no external loop compensation network, current-sense resistors, or feedback dividers. All regulation, stability, and protection functions are implemented internally, enabling immediate use with only CIN, COUT, and optional RIADJ/RVREF resistors.
TPS92550TZX/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
TPS92550TZX/NOPB FAQ
1.How can I place an order for TPS92550TZX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS92550TZX/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 TPS92550TZX/NOPB reliable?
The price and inventory of TPS92550TZX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS92550TZX/NOPB is usually 5 days.
3.What payment methods are accepted for TPS92550TZX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS92550TZX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS92550TZX/NOPB?
TPS92550TZX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS92550TZX/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 TPS92550TZX/NOPB?
For technical support, including TPS92550TZX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS92550TZX/NOPB requirements.
6.How does Aetrix verify that TPS92550TZX/NOPB is sourced from the original manufacturer or authorized distributors?
All TPS92550TZX/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 TPS92550TZX/NOPB meets industry standards.
7.What is the process for return or replacement of TPS92550TZX/NOPB?
All TPS92550TZX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with TPS92550TZX/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 TPS92550TZX/NOPB part is unused and in its original packaging.
Return procedure for TPS92550TZX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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