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Isolated DC/DC converters & modules

LM25184-Q1

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

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Data sheet

LM25184-Q1

ACTIVE
Data sheet Order now

Product details

Vin (Max) (V) 42 Vin (Min) (V) 4.5 Iout (Max) (A) 4.1 Features UVLO adjustable, Enable, Integrated switch, Light load efficiency, Pre-bias soft start Regulated outputs (#) 1 Package type WSON TI functional safety category Functional Safety-Capable Rating Automotive
Vin (Max) (V) 42 Vin (Min) (V) 4.5 Iout (Max) (A) 4.1 Features UVLO adjustable, Enable, Integrated switch, Light load efficiency, Pre-bias soft start Regulated outputs (#) 1 Package type WSON TI functional safety category Functional Safety-Capable Rating Automotive
WSON (NGU) 8 16 mm² 4 x 4
  • 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
  • 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

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.

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, 4.1-A MOSFET datasheet (Rev. A) PDF | HTML 17 Aug 2020
Application note LM5181 Bipolar + and - 18 V Output Design for Signal Chains in PLC Applications PDF | HTML 29 Oct 2021
Technical article MHEVs: Optimizing the automotive powertrain for efficiency and cost 24 May 2021
Application note LM5180 EMI Performance PDF | HTML 04 Apr 2021
Functional safety information LM2518x, LM2518x-Q1 Functional Safety, FIT Rate, Failure Mode Distribution and P PDF | HTML 26 Aug 2020
Technical article How to raise regulation performance with a stacked-output PSR flyback DC/DC converter 02 Jun 2020
Analog Design Journal Why use PSR‐flyback isolated converters in dual‐battery mHEV systems 19 Mar 2020
Analog Design Journal How an auxless PSR-flyback converter can increase PLC reliability and density 30 Sep 2019
EVM User's guide LM25184-Q1 Single-output EVM User's Guide 19 Jul 2019
White paper An overview of radiated EMI specifications for power supplies 05 Jun 2018
White paper An overview of conducted EMI specifications for power supplies 01 Feb 2018
Application note PSR Flyback DC/DC Converter Transformer Design for mHEV Applications 13 Nov 2017

Design & development

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

Evaluation board

LM25184EVM-S12 — 42-VIN, 1-AOUT PSR flyback converter single-output evaluation module

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 (...)
User guide: PDF
Not available on TI.com
Simulation model

LM25184-Q1 PSpice Transient Model

SNVMC00.ZIP (130 KB) - PSpice Model
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Calculation tool

LM25183-LM25184DESIGN-CALC — LM25183 and LM25184 PSR flyback quickstart design tool

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 (...)
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Calculation tool

LM25183 and LM25184 Quickstart Design Tool (Rev. D)

SNVC237D.ZIP (3434 KB)
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PCB layout

LM25184EVM-S12 PCB Layout Files

SNVR476.ZIP (1452 KB)
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Reference designs

TIDM-02012 — High-voltage HEV/EV HVAC eCompressor motor control reference design

The TIDM-02012 is a high-voltage, 5-kW reference design built for HEV/EV compressor (eCompressor) applications controlled by a mid-performance C2000™ TMS320F28003x real-time MCU. It is designed to evaluate with both 400-V and 800-V DC-bus, covering the market-trending of higher battery voltage. A (...)
Design guide: PDF
Reference designs

PMP30834 — Isolated 4-W reference design with integrated switch and primary-side regulation (PSR)

This reference design provides 5.2-V, 4-W isolated voltage from 5-V DC-input supply. The isolated output voltage is sampled from the primary-side flyback voltage that eliminates the need for an optocoupler, voltage reference or third winding from the transformer for output voltage regulation. The (...)
Test report: PDF
Reference designs

PMP30934 — IGBT and SiC gate drive auxiliary PSU reference design

This reference design introduces a tiny auxiliary power supply unit (PSU) used to supply automotive insulated-gate bipolar transistor (IGBT) or automotive silicon carbide (SiC) transistor gate drive.. The isolated outputs support three gate controls. Each is supplied with +17 V and -4 V. For (...)
Test report: PDF
Package Pins Download
WSON (NGU) 8 View options

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