Automotive 42-VIN PSR flyback converter with 65-V, 4.1-A integrated power MOSFET
Product details
Parameters
Package | Pins | Size
Features
- 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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Description
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.
Technical documentation
Type | Title | Date | |
---|---|---|---|
* | Datasheet | LM25184-Q1 42-VIN PSR Flyback DC/DC Converter with 65-V, 2.5-A Integrated MOSFET datasheet (Rev. A) | Aug. 17, 2020 |
Functional safety information | LM2518x, LM2518x-Q1 Functional Safety, FIT Rate, Failure Mode Distribution and P | Aug. 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 | 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
Description
Features
- 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
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 primary (...)
CAD/CAE symbols
Package | Pins | Download |
---|---|---|
WSON (NGU) | 8 | View options |
Ordering & quality
- RoHS
- REACH
- Device marking
- Lead finish/Ball material
- MSL rating/Peak reflow
- MTBF/FIT estimates
- Material content
- Qualification summary
- Ongoing reliability monitoring
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