LM5180QNGURQ1

The LM5180-Q1 is a primary-side regulated (PSR) flyback converter with high efficiency over a wide input voltage range of 4.5V to 65V. The isolated output voltage is sampled from the primary-side flyback voltage, eliminating the need for an optocoupler, voltage reference, or transformer third winding for output voltage regulation. The high level of integration enables simple, reliable, high-density designs with only a single component crossing the isolation barrier. BCM switching enables a compact magnetics solution and load and line regulation performance better than ±1.5%. The integrated 100V power MOSFET supports output power up to 7W and provides increased margin against line transients. The LM5180-Q1 converter simplifies the implementation of isolated DC/DC power supplies, with optional features to optimize performance for target end equipment. The device sets the output voltage with a single resistor, while an optional resistor improves output voltage accuracy by compensating for the thermal coefficient of the flyback diode forward voltage drop. Additional features include internal fixed or externally programmable soft-start, optional bias supply connection for improved efficiency, precision enable input with hysteresis for adjustable line UVLO, hiccup-mode overload protection, and thermal shutdown with auto-recovery. The LM5180-Q1 is AEC-Q100 Grade 1 qualified and is available in an 8-pin WSON package with 0.8mm pitch and wettable flanks.

Applications

• Automotive body electronics
• Automotive powertrain
• Isolated bias power rail

Key features

• AEC-Q100 qualified for automotive applications, device temperature grade 1: ambient temperature range -40°C to 125°C
• Designed for reliable and robust applications
• 4.5V to 65V
• Stable and reliable solution with only one component crossing the isolation barrier
• ±1.5% total output regulation accuracy
• Optional VOUT temperature compensation
• 6ms internal or programmable soft-start
• Input UVLO and thermal shutdown protection
• Discontinuous mode overcurrent fault protection
• Junction temperature range: -40°C to +150°C
• Reduced solution size and cost through integrated technology
• Integrated 100V, 0.4Ω power MOSFET
• VOUT regulation without optocoupler or transformer auxiliary winding
• Low EMI operation, CISPR 25 compliant
• High-efficiency PSR flyback operation
• Quasi-resonant switching in boundary conduction mode (BCM) under heavy load conditions
• External bias option for improved efficiency
• Single-output and multi-output implementation
• Create custom regulator designs using WEBENCH Power Designer