Texas Instruments

LM5181 65 VIN PSR Flyback DC/DC Converter

Texas Instruments' converter features a 100 V, 0.75 A integrated power MOSFET

Image of Texas Instruments' LM5181 PSR Flyback DC/DC ConverterTexas Instruments' LM5181 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 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 4 W with enhanced headroom for line transients. The LM5181 flyback converter is available in an 8-pin, 4 mm × 4 mm, thermally-enhanced WSON package with a 0.8 mm pin pitch.

Features
  • Designed for reliable and rugged applications:
    • Wide input voltage range: 4.5 V to 65 V with operation down to 3.5 V after startup
    • Robust solution with one component crossing the isolation barrier
    • Total output regulation accuracy: ±1.5
    • Optional VOUT temperature compensation
    • 6 ms internal or programmable soft-start
    • Input UVLO and thermal shutdown protection
    • Hiccup-mode overcurrent fault protection
    • Junction temperature range: -40°C to +150°C
  • Integration reduces solution size and cost:
    • Integrated 100 V, 0.4 Ω power MOSFET
    • No optocoupler 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
Applications
  • Isolated field transmitters and field actuators
  • Multi-output rails for analog input modules
  • Motor drives: IGBT and SiC gate drive supplies
  • Building automation HVAC systems
  • Isolated bias supplies

LM5181 PSR Flyback DC/DC Converter

ImageManufacturer Part NumberDescriptionAvailable QuantityPriceView Details
IC REG FLYBACK 5V 500MA 8WSONLM5181NGURIC REG FLYBACK 5V 500MA 8WSON3721 - Immediate$273.53View Details

Evaluation Boards

ImageManufacturer Part NumberDescriptionOutputs and TypePower - OutputCurrent - OutputAvailable QuantityPriceView Details
EVAL BOARD FOR LM5180Q1LM5180EVM-S05EVAL BOARD FOR LM5180Q11 Isolated Output-1A12 - Immediate$10,516.18View Details
EVAL BOARD FOR LM5180Q1LM5180EVM-DUALEVAL BOARD FOR LM5180Q12 Isolated Outputs-200mA, 200mA8 - Immediate$10,516.18View Details
Published: 2020-07-07

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