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Texas Instruments LM25183NGUR
- Part No.:
- LM25183NGUR
- Manufacturer:
- Texas Instruments
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
LM25183NGUR.pdf
- Description:
- IC REG FLYBACK ADJ 2.5A 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:3,134
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Product details
Overview
LM25183NGUR from Texas Instruments is a primary-side regulated (PSR) flyback DC/DC controller IC with integrated 65-V, 2.5-A N-channel power MOSFET, operating from 4.5 V to 42 V input and delivering up to 10 W isolated output power with ±1.5% total regulation accuracy. It implements boundary conduction mode (BCM) switching, supports optional temperature-compensated feedback via TC pin, and targets rugged industrial bias rails requiring minimal components across the isolation barrier.
For engineers reviewing the LM25183NGUR datasheet, LM25183NGUR pinout, LM25183NGUR application, or LM25183NGUR equivalent, this page delivers verified functional safety-capable PSR flyback design parameters, thermal shutdown behavior at 175°C, hiccup-mode overcurrent protection, soft-start timing control, and EMI-optimized quasi-resonant turnoff - all critical for gate driver supply and field transmitter implementations.
Technical Context
The LM25183NGUR uses variable-frequency peak current-mode (VFPCM) control with three operational modes: BCM at heavy loads (12–350 kHz), DCM at medium loads (clamped at 350 kHz max), and frequency foldback mode (FFM) below ~0.5% load (down to 12 kHz min). Its PSR architecture samples reflected flyback voltage at secondary zero-current crossing, eliminating optocoupler or auxiliary winding requirements.
Internal features include a 1.21-V trimmed reference tied to RSET (12.1 kΩ), 5-µA SS/BIAS capacitor charging current for programmable soft-start, ±10 µA TC pin current for diode thermal coefficient compensation, and precision EN/UVLO with 1.45–1.53 V enable threshold and 50-mV hysteresis - enabling robust system sequencing and line transient immunity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V continuous; operates down to 3.5 V after startup - supports wide industrial rail variation and cold-cranking scenarios. |
| Integrated MOSFET | 65-V, 2.5-A N-channel with 0.11 Ω RDS(on) - enables compact 10-W isolated designs without external high-voltage switch. |
| Output Regulation Accuracy | ±1.5% total (line, load, temp) - achieved via PSR sampling and internal error amplifier with 1.21-V reference. |
| Switching Frequency Range | 12 kHz to 350 kHz, variable by load - BCM operation ensures low transformer size and high efficiency across full load range. |
| Thermal Shutdown Threshold | 175°C with 10°C hysteresis - protects against sustained overload or poor heatsinking in enclosed industrial enclosures. |
| Enable UVLO Hysteresis | 50 mV with 1.45–1.53 V rising threshold - allows precise, noise-immune input voltage sequencing and brownout recovery. |
| Soft-Start Time | Internally fixed 6 ms or externally programmable via SS/BIAS capacitor - controls inrush current into large output capacitors. |
Pinout & Package
The LM25183NGUR is housed in an 8-pin, 4.00 mm × 4.00 mm thermally-enhanced WSON package with wettable flanks (NGU suffix), optimized for high-power density and PCB-level thermal dissipation (RθJA = 40.9°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Switch node | Drain of internal 65-V MOSFET; connects directly to primary winding of flyback transformer - carries high dv/dt and peak currents. |
| FB | Primary-side feedback input | Samples reflected flyback voltage at zero-current crossing; sets output via resistor divider with RSET - enables optocoupler-free regulation. |
| VIN | Power input | Bias and sensing input for internal regulators; requires low-impedance path to input capacitor - supports 4.5–42 V operation with 45-V absolute max rating. |
| EN/UVLO | Enable & UVLO programming | Three-state logic interface: <1 V = shutdown, 1–1.5 V = standby, >1.5 V = active - allows adjustable undervoltage lockout using resistor divider. |
| SS/BIAS | Soft-start / external bias | Charged by 5-µA current source for 6-ms internal ramp or external capacitor; >4.25 V enables external bias supply - reduces quiescent current and improves light-load efficiency. |
| TC | Temperature compensation | Accepts current proportional to diode thermal coefficient; used with RSET to offset VF drift - improves output stability over –40°C to +150°C. |
| RSET | Reference current setting | Connects 12.1-kΩ resistor to GND to set 100-µA reference current and 1.21-V internal reference - defines FB scaling and output voltage accuracy. |
| GND | Analog & power ground | Common return for control circuitry and MOSFET source - must be low-inductance, star-connected to minimize noise coupling into FB and TC paths. |
Key Features
| Feature | Design Value |
|---|---|
| Functional safety documentation support | Available FIT data, FMEA reports, and safety analysis templates - accelerates ISO 26262 or IEC 61508 system certification. |
| Single-component isolation barrier | Only SW pin crosses isolation boundary - eliminates optocoupler, auxiliary winding, and associated component count, cost, and reliability risk. |
| Hiccup-mode overcurrent protection | Reduces average power during sustained overload or short circuit - prevents thermal runaway while maintaining self-recovery capability. |
| CISPR 32 EMI compliance optimization | Soft-switching avoids diode reverse recovery; layout-optimized pinout minimizes high-di/dt loops - simplifies Class B conducted/radiated emissions testing. |
| Robust operating junction temperature | Rated from –40°C to +150°C - validated for use in motor drive cabinets, field transmitters, and other high-ambient industrial environments. |
Applications
| Motor Drive Gate Supply | Isolated Field Transmitter |
|---|---|
Use Scenario: Powers isolated IGBT/SiC gate drivers in variable-frequency drives where primary-side control logic must remain electrically separated from high-voltage power stages. IC Role / Device Role / Timing Role: PSR flyback controller providing stable 12-V or 15-V isolated bias with fast transient response and no optocoupler latency. Use Value: Enables compact, high-reliability gate supply with ±1.5% regulation and hiccup-mode fault containment - critical for preventing shoot-through during switching transitions. | Use Scenario: Supplies 3.3-V or 5-V isolated power to 4–20 mA loop-powered field transmitters in hazardous process plants with wide ambient temperature swings. IC Role / Device Role / Timing Role: Primary-side regulated DC/DC converter delivering precise, low-noise bias under 4.5–42 V input variation and –40°C to +85°C ambient. Use Value: Maintains output accuracy across temperature via TC pin compensation and supports cold-start operation down to 3.5 V - ensuring uninterrupted sensor signal integrity. |
| Industrial Isolated Bias Rail | Medical Equipment Auxiliary Supply |
Use Scenario: Generates isolated auxiliary rails (e.g., ±12 V, 5 V) for analog front-ends, ADC references, or isolated communication interfaces in PLCs and HMIs. IC Role / Device Role / Timing Role: High-density PSR flyback IC with integrated MOSFET and internal loop compensation - replaces multi-chip discrete solutions. Use Value: Reduces BOM count by >40% versus optocoupler-based designs while achieving CISPR 32-compliant EMI performance - accelerating EMC validation. | Use Scenario: Provides patient-isolated 5-V or 3.3-V power for microcontroller, display, or sensor subsystems in portable diagnostic devices requiring reinforced insulation. IC Role / Device Role / Timing Role: Safety-certifiable PSR controller supporting creepage/clearance compliance through single-barrier architecture and thermal shutdown at 175°C. Use Value: Meets IEC 60601-1 creepage requirements with minimal board area and eliminates optocoupler aging concerns - enhancing long-term device safety assurance. |
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 MOSFET, 1.2-A peak current, fixed 70-kHz frequency, no TC pin or external bias option | Limited to ≤5 W output; lacks temperature compensation and soft-start programmability - less suitable for precision field transmitters | Select UCC28911DR only for cost-sensitive, low-power (<5 W), fixed-frequency applications where thermal drift compensation is not required. |
| LM5180QNGURQ1 | Automotive-grade (AEC-Q100), 100-V MOSFET, 2.5-A peak current, same pinout but adds spread-spectrum EMI reduction | Qualified for automotive under-hood use; higher VIN max and enhanced EMI features - over-specified for industrial bias but offers longer lifecycle | Choose LM5180QNGURQ1 when automotive qualification, extended 100-V input headroom, or spread-spectrum EMI control are mandatory design requirements. |
Compared with UCC28911DR, LM25183NGUR delivers higher output power (10 W vs. 5 W), programmable soft-start, and diode thermal compensation - making it superior for precision industrial bias. Versus LM5180QNGURQ1, it trades automotive qualification for lower cost and identical industrial thermal specs, offering optimal value for non-automotive applications.
Availability
LM25183NGUR is available at Aetrix Electronics and suitable for motor drive gate supplies, isolated field transmitters, and industrial bias rails requiring stable component supply, long-term manufacturability, and consistent parametric performance across production lots.
Supply support for LM25183NGUR 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 high-reliability industrial and automotive power conversion.
The LM25183NGUR belongs to TI's PSR flyback controller product line, designed specifically for compact, low-component-count isolated DC/DC supplies in harsh industrial environments - emphasizing ruggedness, functional safety readiness, and EMI robustness.
FAQ
What is the maximum output power achievable with the LM25183NGUR?
The LM25183NGUR supports up to 10 W of isolated output power, enabled by its integrated 65-V, 2.5-A MOSFET with 0.11-Ω RDS(on). 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 inadequate PCB copper, derating may apply per the RθJA = 40.9°C/W thermal metric.
Does the LM25183NGUR require an optocoupler for feedback regulation?
No, the LM25183NGUR does not require an optocoupler. It implements primary-side regulation (PSR) by sampling the reflected flyback voltage at the SW pin during secondary zero-current detection. This eliminates the need for optocouplers or auxiliary windings, reducing component count, cost, and long-term reliability risks associated with optocoupler aging.
How is output voltage accuracy improved across temperature with the LM25183NGUR?
Output voltage accuracy across temperature is improved using the TC pin and an external resistor between TC and RSET. This network compensates for the thermal coefficient of the secondary flyback diode's forward voltage drop. With proper selection per Equation 9 in the datasheet, the LM25183NGUR achieves ±1.5% total regulation accuracy from –40°C to +150°C junction temperature.
What protection features are built into the LM25183NGUR?
The LM25183NGUR integrates input UVLO with hysteresis, hiccup-mode overcurrent protection, thermal shutdown at 175°C with 10°C hysteresis, and robust absolute maximum ratings (e.g., 45-V VIN, 70-V SW). These protections ensure safe operation during line transients, output shorts, overheating, and brownout conditions - critical for unattended industrial deployments.
Can the LM25183NGUR operate with an external bias supply?
Yes, the LM25183NGUR supports external bias via the SS/BIAS pin. When voltage at SS/BIAS exceeds 4.25 V, the internal LDO regulator switches from VIN-derived bias to the external source - reducing input quiescent current and improving light-load efficiency. An auxiliary winding on the flyback transformer is a common implementation, as shown in Figure 7-4 of the datasheet.
LM25183NGUR 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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 1.21V
- Voltage - Output (Max):
- 42V
- Current - Output:
- 2.5A
- Frequency - Switching:
- 12kHz ~ 350kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-WSON (4x4)
LM25183NGUR FAQ
1.How can I place an order for LM25183NGUR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM25183NGUR 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 LM25183NGUR reliable?
The price and inventory of LM25183NGUR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM25183NGUR is usually 5 days.
3.What payment methods are accepted for LM25183NGUR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM25183NGUR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM25183NGUR?
LM25183NGUR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM25183NGUR 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 LM25183NGUR?
For technical support, including LM25183NGUR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM25183NGUR requirements.
6.How does Aetrix verify that LM25183NGUR is sourced from the original manufacturer or authorized distributors?
All LM25183NGUR 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 LM25183NGUR meets industry standards.
7.What is the process for return or replacement of LM25183NGUR?
All LM25183NGUR units undergo pre-shipment inspection (PSI). If there is an issue with LM25183NGUR, 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 LM25183NGUR part is unused and in its original packaging.
Return procedure for LM25183NGUR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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