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Texas Instruments LM25184 | Demoboard LM25184EVM-S12
42-VIN PSR flyback converter with 65-V, 4.1-A integrated power MOSFET
Overview
| Topology | Flyback Converter |
| Input voltage | 6-42 V |
| Output 1 | 12.3 V / 0.8 A |
| IC revision | A |
Description
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.
Features
- Functional Safety-Capable
- Documentation available to aid functional safety system design
- 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
Typical applications
- Automotive powertrain systems / Traction inverter and motor drives: IGBT and SiC gate drive supplies / Isolated bias power railsIsolated field transmitters and field actuators
- Sub-AM band automotive body electronics
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | L(µH) | IRP,40K(A) | ISAT,30%(A) | RDC typ.(mΩ) | fres(MHz) | VOP(V) | Mount | VIN | VOut1(V) | IOut1(A) | n | IR(mA) | ISAT(A) | RDC max.(Ω) | LS(nH) | VT(V (DC)) | Size | Z @ 100 MHz(Ω) | Zmax(Ω) | Test Condition Zmax | IR 2(mA) | RDC max.(mΩ) | Type | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-MAPI SMT Power Inductor, 4.7 µH, 5.1 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-MAPI SMT Power Inductor | Inductance4.7 µH | Performance Rated Current5.1 A | Saturation Current @ 30%8.2 A | DC Resistance39.9 mΩ | Self Resonant Frequency24 MHz | Operating Voltage80 V | MountSMT | – | – | – | – | – | Saturation Current6.4 A | – | – | – | Size4030 | – | – | – | – | DC Resistance44 mΩ | – | ||||
 | WE-FLYTI Flyback Transformers, 7 µH, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-FLYTI Flyback Transformers | Inductance7 µH | – | – | – | – | – | MountSMT | Input Voltage 15 - 42 V (DC) | Output Voltage 112 V | Output Current 11 A | Turns Ratio1:1 | – | Saturation Current6.4 A | – | Leakage Inductance250 nH | Insulation Test Voltage1500 V (DC) | SizeEP7 | – | – | – | – | – | – | ||||
 | WE-CBF SMT EMI Suppression Ferrite Bead, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-CBF SMT EMI Suppression Ferrite Bead | – | – | – | – | – | – | MountSMT | – | – | – | – | Rated Current6000 mA | – | DC Resistance [1]0.008 Ω | – | – | Size0805 | Impedance @ 100 MHz22 Ω | Maximum Impedance40 Ω | Maximum Impedance1000 MHz | Rated Current 26000 mA | DC Resistance8 mΩ | TypeHigh Current |