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Texas Instruments LM25184NGUR
- Part No.:
- LM25184NGUR
- Manufacturer:
- Texas Instruments
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
LM25184NGUR.pdf
- Description:
- IC REG FLYBACK 12V 4.1A 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:5,382
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Product details
Overview
LM25184NGUR from Texas Instruments is a primary-side regulated (PSR) flyback DC/DC controller IC with integrated 65-V, 4.1-A N-channel MOSFET, operating from 4.5 V to 42 V input and delivering up to 15 W isolated output power with ±1.5% total regulation accuracy across –40°C to +150°C junction temperature - used in IGBT/SiC gate driver supplies and isolated bias rails for motor drives.
For engineers reviewing the LM25184NGUR datasheet, LM25184NGUR pinout, LM25184NGUR application, or LM25184NGUR equivalent, this page delivers verified technical context, boundary conduction mode (BCM) operation details, thermal compensation capability, soft-start configuration options, and real-world EMI performance aligned with CISPR 32.
Technical Context
The LM25184NGUR implements variable-frequency peak current-mode (VFPCM) control with three operational modes: boundary conduction mode (BCM) at heavy loads (12–350 kHz), discontinuous conduction mode (DCM) at mid loads (clamped at 350 kHz), and frequency foldback mode (FFM) at light loads (down to 12 kHz). It samples reflected flyback voltage on the primary side to eliminate optocouplers and auxiliary windings.
Its integrated 65-V, 0.11-Ω MOSFET supports 4.1-A peak current limiting and enables single-component isolation barrier design. Internal loop compensation, programmable EN/UVLO hysteresis (±50 mV), and TC pin-based diode forward-voltage thermal compensation ensure stable regulation across temperature and line variations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports wide industrial input rails; operates down to 3.5 V after startup for brownout resilience. |
| Output Regulation Accuracy | ±1.5% total - includes line, load, and temperature variation; enables precise isolated bias without secondary sensing. |
| Integrated MOSFET | 65-V, 4.1-A peak, 0.11-Ω RDS(on) - eliminates external high-side switch; supports 15-W output with margin for transients. |
| Switching Frequency Range | 12 kHz to 350 kHz - dynamically adjusts across BCM/DCM/FFM to maximize efficiency from full to light load. |
| Junction Temperature Range | –40°C to +150°C - qualified for under-hood, factory automation, and industrial motor drive environments. |
| Thermal Shutdown | 175°C with 10°C hysteresis - auto-recovery prevents latch-up; protects against sustained overload or poor heatsinking. |
| EMI Compliance | Optimized for CISPR 32 - soft switching avoids diode reverse recovery; reduces filter component count and board area. |
Pinout & Package
LM25184NGUR is housed in an 8-pin, 4.0 mm × 4.0 mm thermally enhanced WSON package with wettable flanks (NGU suffix), enabling reliable solder joint inspection and improved thermal dissipation via bottom-side thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Switch node | Internally connected to MOSFET drain; connects directly to primary winding of flyback transformer - carries high dv/dt switching waveform. |
| FB | Primary-side feedback input | Samples reflected flyback voltage; ratio of FB-to-SW resistor vs. RSET sets output voltage - eliminates optocoupler requirement. |
| VIN | Power input | Supplies internal bias regulators and senses input voltage; requires low-impedance path to bulk capacitor for stability. |
| EN/UVLO | Enable & UVLO programming | Three-state logic: <1 V = shutdown, 1–1.5 V = standby, >1.5 V = active; hysteresis ensures clean power sequencing. |
| SS/BIAS | Soft-start timing or external bias input | 5-µA current source charges external capacitor for adjustable start-up ramp; >4.25 V enables external bias to reduce quiescent current. |
| TC | Temperature compensation | Adjusts feedback reference based on diode VF thermal drift; improves output regulation over temperature when paired with RSET. |
| RSET | Reference current setting | 12.1-kΩ to GND sets 100-µA reference current and 1.21-V internal reference - defines output voltage scaling factor. |
| GND | Analog & power ground | Common return for control circuitry and MOSFET source; must be low-inductance connection to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Primary-side regulation (PSR) | Eliminates optocoupler and auxiliary winding - reduces BOM count, improves reliability, and simplifies transformer design. |
| Boundary conduction mode (BCM) | Enables compact magnetics and tight regulation (<±1.5%) without complex secondary feedback compensation. |
| Integrated 65-V, 4.1-A MOSFET | Supports 15-W output with headroom for 42-V transients - removes need for external high-voltage switch and gate driver. |
| Diode thermal compensation (TC pin) | Corrects output drift caused by Si/SiC flyback diode VF temperature coefficient - maintains regulation accuracy across –40°C to +150°C. |
| Configurable soft-start | 6-ms internal timer or externally programmable via SS/BIAS capacitor - prevents inrush current into large output capacitors. |
| CISPR 32–optimized EMI | Soft-switching architecture minimizes high-frequency ringing and diode reverse recovery noise - reduces need for snubbers and shielding. |
Applications
| Motor Drive Gate Supply | Isolated Field Transmitter |
|---|---|
Use Scenario: Powers isolated IGBT or SiC gate drivers in variable-frequency drives where primary-side bus voltage ranges from 12 V to 42 V DC. IC Role / Device Role / Timing Role: PSR flyback controller providing regulated 15-V or ±15-V isolated gate bias with fast transient response and no optocoupler latency. Use Value: Enables compact, high-reliability gate supply with ±1.5% regulation - critical for preventing shoot-through during PWM transitions. | Use Scenario: Supplies 5-V or 24-V isolated power to 4–20 mA field transmitters in hazardous industrial zones (e.g., oil & gas, chemical plants). IC Role / Device Role / Timing Role: Primary-side regulated flyback converter delivering intrinsically safe, low-noise bias rail with minimal component count across wide input range. Use Value: Eliminates optocoupler aging and transformer auxiliary winding - extends calibration interval and improves long-term measurement stability. |
| Industrial PLC I/O Module | Medical Isolated Bias Rail |
Use Scenario: Generates isolated 3.3-V or 5-V logic rails for digital I/O modules in programmable logic controllers operating from 24-V DC field buses. IC Role / Device Role / Timing Role: High-density PSR flyback controller supporting multi-output configurations with optional VOUT temperature compensation. Use Value: Delivers stable, low-EMI bias under varying load conditions - ensures deterministic communication timing and EMC compliance per IEC 61000-4-x. | Use Scenario: Provides reinforced isolation for patient-connected diagnostic equipment requiring 5-V or 12-V auxiliary rails compliant with IEC 60601-1 creepage/clearance. IC Role / Device Role / Timing Role: Safety-capable PSR flyback IC with functional safety documentation support and 150°C junction rating for high-temperature sterilization cycles. Use Value: Meets reinforced isolation requirements with single-component barrier - reduces risk of failure propagation and simplifies safety certification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PSR flyback controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC28911DR | 65-V, 1.2-A MOSFET; fixed 110-kHz frequency; no TC pin or external bias option | Limited to ≤5 W output; lacks thermal compensation and BCM flexibility - less accurate regulation over temperature | Choose UCC28911DR only for cost-sensitive, low-power applications where ±3% regulation is acceptable. |
| LM5021MMX/NOPB | External MOSFET required; 100-V max input; no integrated PSR sampling - needs optocoupler feedback | Higher solution size and BOM count; supports higher input voltages but adds complexity and reliability risk | Choose LM5021MMX/NOPB only when >42-V input or custom control loop tuning is required - not drop-in compatible. |
Compared with UCC28911DR and LM5021MMX/NOPB, LM25184NGUR uniquely combines integrated 4.1-A MOSFET, PSR accuracy (±1.5%), TC-based thermal compensation, and BCM/DCM/FFM adaptability - making it optimal for 5–15 W industrial isolated supplies demanding compactness, reliability, and precision.
Availability
LM25184NGUR is available at Aetrix Electronics and suitable for motor drive gate supplies, isolated field transmitters, and industrial PLC I/O modules requiring stable component supply, long lifecycle support, and production-ready qualification.
Supply support for LM25184NGUR 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 company specializing in analog, embedded processing, and power management technologies, with leadership in high-reliability industrial and automotive power solutions.
The LM25184NGUR belongs to TI's high-density isolated DC/DC controller product line, designed specifically for rugged industrial applications requiring primary-side regulation, wide input range, and functional safety support.
FAQ
What is the maximum output power supported by the LM25184NGUR?
The LM25184NGUR supports up to 15 W of isolated output power using its integrated 65-V, 4.1-A MOSFET. This rating assumes proper thermal management, appropriate transformer design, and operation within the 4.5–42 V input range. At higher ambient temperatures or with limited PCB copper area, derating may be necessary to maintain the 150°C maximum junction temperature.
Does the LM25184NGUR require an optocoupler for feedback?
No, the LM25184NGUR does not require an optocoupler. It uses primary-side regulation (PSR) by sampling the reflected flyback voltage at the SW pin through the FB resistor network. This eliminates the need for optocouplers or auxiliary transformer windings, reducing component count, improving reliability, and simplifying layout - a core design feature confirmed in the device description and pin function table.
How is output voltage set on the LM25184NGUR?
The output voltage of the LM25184NGUR is set by the ratio of the FB-to-SW resistor (RFB) and the RSET-to-GND resistor (12.1 kΩ). Equation 8 in the datasheet defines this relationship: VOUT ≈ VREF × (NPS × RFB / RSET) + VD, where VREF = 1.21 V and VD is the flyback diode forward voltage. An optional TC pin resistor further corrects for VD temperature drift.
What is the purpose of the TC pin on the LM25184NGUR?
The TC (Temperature Compensation) pin on the LM25184NGUR adjusts the feedback reference to counteract the negative temperature coefficient of the flyback diode's forward voltage drop. By connecting a resistor between TC and RSET, the IC compensates for VF drift across –40°C to +150°C, maintaining ±1.5% output regulation accuracy without secondary sensing - a verified feature detailed in Section 7.3.3.1 and Figure 6-9.
Can the LM25184NGUR operate with input voltage below 4.5 V?
Yes, the LM25184NGUR can operate down to 3.5 V after startup, though its specified input operating range is 4.5 V to 42 V. Below 4.5 V, functionality is not guaranteed across temperature and load - the 3.5-V minimum applies only to sustaining operation post-startup, not initial enablement. Startup requires ≥4.5 V at VIN or sufficient voltage at EN/UVLO to exceed the 1.5-V enable threshold.
LM25184NGUR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-WDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Flyback
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 12V
- Voltage - Output (Max):
- -
- Current - Output:
- 4.1A
- Frequency - Switching:
- 12kHz ~ 350kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 8-WSON (4x4)
LM25184NGUR FAQ
1.How can I place an order for LM25184NGUR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM25184NGUR 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 LM25184NGUR reliable?
The price and inventory of LM25184NGUR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM25184NGUR is usually 5 days.
3.What payment methods are accepted for LM25184NGUR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM25184NGUR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM25184NGUR?
LM25184NGUR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM25184NGUR 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 LM25184NGUR?
For technical support, including LM25184NGUR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM25184NGUR requirements.
6.How does Aetrix verify that LM25184NGUR is sourced from the original manufacturer or authorized distributors?
All LM25184NGUR 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 LM25184NGUR meets industry standards.
7.What is the process for return or replacement of LM25184NGUR?
All LM25184NGUR units undergo pre-shipment inspection (PSI). If there is an issue with LM25184NGUR, 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 LM25184NGUR part is unused and in its original packaging.
Return procedure for LM25184NGUR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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