Automotive 42-VIN no-opto flyback converter with 65-V, 4.1-A integrated MOSFET


Product details


Vin (Max) (V) 42 Vin (Min) (V) 4.5 Iout (Max) (A) 4.1 Features Adjustable UVLO, Enable, Integrated Switches, Light Load Efficiency, Pre-Bias Start-Up Operating temperature range (C) -40 to 150 Regulated outputs (#) 1 Package type WSON TI functional safety category Functional Safety-Capable open-in-new Find other Isolated DC/DC converters & modules

Package | Pins | Size

WSON (NGU) 8 16 mm² 4 x 4 open-in-new Find other Isolated DC/DC converters & modules


  • AEC-Q100-qualified for automotive applications
    • Device temperature grade 1: –40°C to 125°C ambient temperature range
  • Functional Safety-Capable
  • Designed for reliable and rugged applications
    • Wide input voltage range of 4.5 V to 42 V
    • Robust solution with only one component crossing the isolation barrier
    • ±1.5% total output regulation accuracy
    • Optional VOUT temperature compensation
    • –40°C to +150°C junction temperature range
  • Integration reduces solution size and cost
    • Integrated 65-V, 0.11-Ω power MOSFET
    • No optocoupler or transformer auxiliary winding required for VOUT regulation
  • High-efficiency PSR flyback operation
    • Quasi-resonant MOSFET turnoff in BCM
    • Single- and multi-output implementations
  • Ultra-low conducted and radiated EMI signatures
    • Soft switching avoids diode reverse recovery
    • Optimized for CISPR 25 Class 5 requirement
  • Create a custom flyback regulator design using WEBENCH Power Designer
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The LM25184-Q1 is a primary-side regulated (PSR) flyback converter with high efficiency over a wide input voltage range of 4.5 V to 42 V. The isolated output voltage is sampled from the primary-side flyback voltage. The high level of integration results in a simple, reliable, and high-density design with only one component crossing the isolation barrier. Boundary conduction mode (BCM) switching enables a compact magnetic solution and better than ±1.5% load and line regulation performance. An integrated 65-V power MOSFET provides output power up to 15 W with enhanced headroom for line transients.

The LM25184-Q1 simplifies the implementation of isolated DC/DC supplies with optional features to optimize performance for the target end equipment. The output voltage is set by one resistor, while an optional resistor improves output voltage accuracy by negating the thermal coefficient of the flyback diode voltage drop. Additional features include an internally-fixed or externally-programmable soft-start, precision enable input with hysteresis for adjustable line UVLO, hiccup-mode overload protection, and thermal shutdown protection with automatic recovery.

The LM25184-Q1 converter is qualified to automotive AEC-Q100 grade 1 and is available in 8-pin WSON package with 0.8-mm pin pitch and wettable flanks.

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Technical documentation

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Type Title Date
* Data sheet LM25184-Q1 42-VIN PSR Flyback DC/DC Converter with 65-V, 2.5-A Integrated MOSFET datasheet (Rev. A) Aug. 17, 2020
Technical article MHEVs: Optimizing the automotive powertrain for efficiency and cost May 24, 2021
Application note LM5180 EMI Performance Apr. 04, 2021
Functional safety information LM2518x, LM2518x-Q1 Functional Safety, FIT Rate, Failure Mode Distribution and P Aug. 26, 2020
Technical article How to raise regulation performance with a stacked-output PSR flyback DC/DC converter Jun. 02, 2020
Application note Why use PSR‐flyback isolated converters in dual‐battery mHEV systems Mar. 19, 2020
Application note How an auxless PSR-flyback converter can increase PLC reliability and density Sep. 30, 2019
User guide LM25184-Q1 Single-output EVM User's Guide Jul. 19, 2019
White paper An overview of radiated EMI specifications for power supplies Jun. 05, 2018
White paper An overview of conducted EMI specifications for power supplies Feb. 01, 2018
Application note PSR Flyback DC/DC Converter Transformer Design for mHEV Applications Nov. 13, 2017

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

document-generic User guide
The LM25184EVM-S12 evaluation module (EVM) is designed to showcase the performance of the LM25184-Q1 PSR flyback converter with wide input voltage range. The design is packaged in a miniature footprint with low component count. It operates over a wide input voltage range of 6 V to 42 V to deliver a (...)
  • 6-V to 42-V input voltage range
  • 12-V output voltage with 1.5% setpoint accuracy
  • Rated for 1 A of load current
  • Resistor divider to EN/UVLO to faciltate programmable input voltage UVLO
  • Fully assembled, tested and proven PCB layout with small footprint

Design tools & simulation

SNVMC00.ZIP (130 KB) - PSpice Model
LM25183 and LM25184 PSR flyback quickstart design tool
LM25183-LM25184DESIGN-CALC — Welcome to the LM25183 and LM25184 quickstart design tool. This standalone tool facilitates and assists the power-supply engineer with the design of a DC/DC flyback regulator based on the LM25183 and LM25184 PSR flyback converter. As such, the user can expeditiously arrive at an optimized design to (...)
  • Select transformer parameters including turns ratio and mag inductance
  • Determine input and output capacitances for specified ripple requirements (1% VOUT and 5% VIN)
  • Select components for feedback, soft-start, input UVLO and temperature compensation
  • Advise components (usually optional) for primary (...)
SNVC237B.ZIP (3085 KB)
SNVR476.ZIP (1452 KB)

Reference designs

Multi-output, primary-side regulated flyback reference design for automotive IGBT gate drivers
PMP40747 — This reference design provides an isolated power supply for automotive IGBT gate drivers. The primary-side regulated flyback controller LM25184-Q1 is used to avoid optocoupler and improve system reliability. Three transformers are used to achieve multiple outputs and facilitate flexible system (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

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WSON (NGU) 8 View options

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