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LM25184-Q1

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

Product details

Device type Converters Topology PSR flyback Vin (min) (V) 4.5 Vin (max) (V) 42 Iout (max) (A) 4.1 Features Enable, Integrated Switch, Light load efficiency, Pre-bias soft start, UVLO adjustable Operating temperature range (°C) -40 to 150 Regulated outputs (#) 1 TI functional safety category Functional Safety-Capable Control mode Peak current mode Rating Automotive
Device type Converters Topology PSR flyback Vin (min) (V) 4.5 Vin (max) (V) 42 Iout (max) (A) 4.1 Features Enable, Integrated Switch, Light load efficiency, Pre-bias soft start, UVLO adjustable Operating temperature range (°C) -40 to 150 Regulated outputs (#) 1 TI functional safety category Functional Safety-Capable Control mode Peak current mode 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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Design & development

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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
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
Isolated DC/DC converters & modules
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
PCB layout

LM25184EVM-S12 PCB Layout Files

SNVR476.ZIP (1452 KB)
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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
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Test report: PDF
Package Pins Download
WSON (NGU) 8 View options

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