LM5180

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65-VIN PSR flyback converter with 100-V, 1.5-A integrated power MOSFET

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Product details

Parameters

Vin (Max) (V) 65 Vin (Min) (V) 4.5 Features Adjustable UVLO, Enable, Integrated Switches, Light Load Efficiency, Pre-Bias Start-Up Operating temperature range (C) -40 to 150 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

Features

  • Designed for reliable and rugged applications
    • Wide input voltage range of 4.5 V to 65 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
    • 6-ms internal or programmable soft start
    • Input UVLO and thermal shutdown protection
    • Hiccup-mode overcurrent fault protection
    • –40°C to +150°C junction temperature range
  • Integration reduces solution size and cost
    • Integrated 100-V, 0.4-Ω power MOSFET
    • No opto-coupler or transformer auxiliary winding required for VOUT regulation
    • Internal loop compensation
  • High-efficiency PSR flyback operation
    • Quasi-resonant MOSFET turn-off in BCM
    • Low input quiescent current
    • 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 regulator design using WEBENCH® Power Designer

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Description

The LM5180 is a primary-side regulated (PSR) flyback converter with high efficiency over a wide input voltage range of 4.5 V to 65 V. The isolated output voltage is sampled from the primary-side flyback voltage, eliminating the need for an optocoupler, voltage reference, or third winding from the transformer for output voltage regulation.

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 100-V power MOSFET provides output power up to 7 W with enhanced headroom for line transients.

The LM5180 flyback converter is available in a 8-pin, 4-mm × 4-mm, thermally-enhanced WSON package with 0.8-mm pin pitch.

The LM5180 flyback converter simplifies 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, optional bias supply connection for higher efficiency, precision enable input with hysteresis for adjustable line UVLO, hiccup-mode overload protection, and thermal shutdown protection with automatic recovery.

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Technical documentation

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Type Title Date
* Datasheet LM5180 65-VIN PSR Flyback DC/DC Converter with 100-V, 1.5-A Integrated Power MOSFET datasheet (Rev. D) Sep. 18, 2019
Application note Selecting output caps to optimize ripple and stability in PSR flyback converters Sep. 22, 2020
Application note Topology Selection for Isolated Power Supplies in Patient Monitor (Rev. A) Sep. 02, 2020
Functional safety information LMx518x-Q1 Functional Safety FIT Rate and Failure Mode Distribution (Rev. A) Jun. 26, 2020
Technical articles 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 Designing High Voltage Power Supply for Ultrasound Smart Probes Oct. 22, 2019
Application note How an auxless PSR-flyback converter can increase PLC reliability and density Sep. 30, 2019
User guide LM5180-Q1 Dual-Output EVM User's Guide (Rev. B) Jul. 18, 2019
User guide LM5180-Q1 Single-Output EVM User's Guide (Rev. D) Jul. 18, 2019
Application note Powering Drones With a Wide VIN DC-DC Converter (Rev. A) Feb. 05, 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
Application note Seminar 900 Topic 2 - Snubber Circuits: Theory, Design and Application Feb. 15, 2001

Design & development

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

Hardware development

EVALUATION BOARD Download
99
Description
The LM5180EVM-DUAL evaluation module (EVM) is designed to showcase the performance of the LM5180 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 10 V to 65 V to deliver a (...)
Features
  • 10-V to 65-V input voltage range
  • 15-V and -7.7-V output voltages
  • Rated for up to 200 mA of load current
  • Resistor divider to EN/UVLO to faciltate programmable input voltage UVLO
  • Fully assembled, tested and proven PCB layout with small footprint
EVALUATION BOARD Download
75
Description
The LM5180EVM-S05 evaluation module (EVM) is designed to showcase the performance of the LM5180 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 10 V to 65 V to deliver a (...)
Features
  • 10-V to 65-V input voltage range
  • 5-V output voltage with 1% setpoint accuracy
  • Rated for up to 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

SIMULATION MODEL Download
SNVMBL6.ZIP (183 KB) - PSpice Model
SIMULATION MODEL Download
SNVMBW8.TSC (1102 KB) - TINA-TI Reference Design
SIMULATION MODEL Download
SNVMBW9.TSC (1100 KB) - TINA-TI Reference Design
SIMULATION MODEL Download
SNVMBX0.TSC (1352 KB) - TINA-TI Reference Design
SIMULATION MODEL Download
SNVMBX1.TSC (1345 KB) - TINA-TI Reference Design
CALCULATION TOOL Download
LM5180 PSR flyback converter design tool
LM5180DESIGN-CALC — Welcome to the LM5180 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 LM5180 PSR flyback converter. As such, the user can expeditiously arrive at an optimized design to meet the application (...)
Features
  • 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 SW voltage (...)
GERBER FILE Download
SNVC218A.ZIP (2527 KB)
PCB LAYOUT Download
SNVC233.ZIP (1903 KB)
PCB LAYOUT Download
SNVR472.ZIP (3416 KB)

Reference designs

REFERENCE DESIGNS Download
>95% Efficiency, 1-kW analog control AC/DC reference design for 5G telecom rectifier
TIDA-010081 — This compact, high efficiency reference design with a 54-V DC, 1000-W output targets 5G telecom power and industrial AC/DC power supplies. The circuit consists of a front-end continuous conduction mode (CCM) power factor correction (PFC) circuit based on the UCC28180, followed by a robust LLC stage (...)
document-generic Schematic
REFERENCE DESIGNS Download
Isolated 2.5-W SiC & IGBT gate-drive reference design with integrated switch PSR flyback converter
PMP30629 — This reference design provides two isolated voltages from a 24-V DC input supply. By means of zero ohm resistors, it is possible to configure the two independent outputs as +15 V and +4 V, or +15 V and -4 V with common ground with a total power of 2.5 W. The integration of a 100-V rated primary-side (...)
document-generic Schematic
REFERENCE DESIGNS Download
Channel-to-channel isolated analog input module reference design
TIDA-010048 — This reference design is a four channel-to-channel, isolated 4–20 mA, current-loop analog input module. The design includes a short circuit, overcurrent, and overvoltage limit function for condition monitoring sensor and module applications. The major features of this analog input module (...)
document-generic Schematic
REFERENCE DESIGNS Download
Isolated IGBT gate-drive power supply reference design with integrated switch PSR flyback controller
TIDA-010006 This reference design provides isolated positive and negative voltage rails for Insulated  Gate Bipolar Transistor (IGBT) gate drivers from a 24-V DC input supply. It uses a flyback power supply topology to generate four pairs of 15-V and –5-V outputs suitable for powering six IGBT gate (...)
document-generic Schematic

CAD/CAE symbols

Package Pins Download
WSON (NGU) 8 View options

Ordering & quality

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  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

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