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AC/DC & DC/DC converters (integrated FET)

LM25184

ACTIVE

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

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Data sheet

LM25184

ACTIVE
Data sheet Order now

Product details

Iout (max) (A) 4.1 Vin (min) (V) 4.5 Vin (max) (V) 42 Topology PSR flyback Switching frequency (min) (kHz) 12 Switching frequency (max) (kHz) 350 Features Enable, External bias input, Integrated Switch, Pre-bias soft start, UVLO adjustable Control mode Peak current mode Rating Catalog Operating temperature range (°C) -40 to 150
Iout (max) (A) 4.1 Vin (min) (V) 4.5 Vin (max) (V) 42 Topology PSR flyback Switching frequency (min) (kHz) 12 Switching frequency (max) (kHz) 350 Features Enable, External bias input, Integrated Switch, Pre-bias soft start, UVLO adjustable Control mode Peak current mode Rating Catalog Operating temperature range (°C) -40 to 150
WSON (NGU) 8 16 mm² 4 x 4
  • Functional Safety-Capable
  • Designed for reliable and rugged applications
    • Wide input voltage range of 4.5 V to 42 V with operation down to 3.5 V after start-up
    • 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
    • Internal loop compensation
  • High-efficiency PSR flyback operation
    • Quasi-resonant MOSFET turnoff in BCM
    • External bias option for improved efficiency
    • Single- and multi-output implementations
  • Ultra-low conducted and radiated EMI signatures
    • Soft switching avoids diode reverse recovery
    • Optimized for CISPR 32 EMI requirements
  • Create a custom flyback regulator design using WEBENCH Power Designer
  • Functional Safety-Capable
  • Designed for reliable and rugged applications
    • Wide input voltage range of 4.5 V to 42 V with operation down to 3.5 V after start-up
    • 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
    • Internal loop compensation
  • High-efficiency PSR flyback operation
    • Quasi-resonant MOSFET turnoff in BCM
    • External bias option for improved efficiency
    • Single- and multi-output implementations
  • Ultra-low conducted and radiated EMI signatures
    • Soft switching avoids diode reverse recovery
    • Optimized for CISPR 32 EMI requirements
  • Create a custom flyback regulator design using WEBENCH Power Designer

The LM25184 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 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 flyback converter is available in a 8-pin, 4-mm × 4-mm, thermally-enhanced WSON package with 0.8-mm pin pitch.

The LM25184 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 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 flyback converter is available in a 8-pin, 4-mm × 4-mm, thermally-enhanced WSON package with 0.8-mm pin pitch.
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Technical documentation

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Type Title Date
* Data sheet LM25184 42-VIN PSR Flyback DC/DC Converter with 65-V, 4.1-A Power MOSFET datasheet (Rev. A) PDF | HTML 17 Aug 2020
Technical article Mitigating CMTI on a PSR flyback for SiC-based traction inverter designs PDF | HTML 05 Jan 2024
Analog Design Journal Why use PSR‐flyback isolated converters in dual‐battery mHEV systems (Rev. A) PDF | HTML 25 May 2023
Analog Design Journal Selecting output caps to optimize ripple and stability in PSR flyback converters (Rev. B) PDF | HTML 04 May 2023
Product overview Isolated Power Topologies for PLC I/O Modules and Other Low-Power Applications PDF | HTML 09 Nov 2022
Application note LM5181 Bipolar + and - 18 V Output Design for Signal Chains in PLC Applications PDF | HTML 29 Oct 2021
Technical article Meeting the power demands of evolving robot system architectures PDF | HTML 13 Oct 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 conver PDF | HTML 02 Jun 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 brief 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 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 (...)
Supported products & hardware

Supported products & hardware

Products
AC/DC & DC/DC converters (integrated FET)
LM25180-Q1 — Automotive 42-VIN PSR flyback converter with 65-V, 1.5-A integrated power MOSFET LM25183 — 42-VIN no-opto flyback converter with 65-V, 2.5-A integrated MOSFET LM25183-Q1 — Automotive 42-VIN no-opto flyback converter with 65-V, 2.5-A integrated MOSFET LM25184 — 42-VIN no-opto flyback converter with 65-V, 4.1-A integrated MOSFET LM25184-Q1 — Automotive 42-VIN no-opto flyback converter with 65-V, 4.1-A integrated MOSFET
Hardware development
Evaluation board
LM25184EVM-S12 — 42-VIN, 1-AOUT PSR flyback converter single-output evaluation module
Software
Calculation tool
LM25183-LM25184DESIGN-CALC — LM25183 and LM25184 PSR flyback quickstart design tool
Download
PCB layout

LM25184EVM-S12 PCB Layout Files

SNVR476.ZIP (1452 KB)
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Package Pins Download
WSON (NGU) 8 View options
TI's Standard Terms and Conditions for Evaluation Items apply.

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