LM5180 65-VIN PSR flyback converter with 100-V, 1.5-A integrated power MOSFET | TI.com

LM5180 (PREVIEW) 65-VIN PSR flyback converter with 100-V, 1.5-A integrated power MOSFET


Sample Availability

Alternate preproduction samples are available (PM5180QNGUTQ1). This device has the same functionality, pinout and package as the LM5180 but is not an exact equivalent. Order Now


The LM5180 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 is 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% load and line regulation performance. An integrated 100-V power MOSFET provides output power up to 7 W with enhanced headroom for line transients.

The LM5180 converter simplifies 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, optional bias supply connection for higher efficiency, precision enable input with hysteresis for adjustable line UVLO, hiccup-mode overload protection, and thermal shutdown protection with automatic recovery.

The LM5180 flyback converter is available in a 8-pin, 4-mm × 4-mm, thermally-enhanced WSON package with 0.8-mm pin pitch.


  • Designed for reliable and rugged applications
    • Wide input voltage range of 4.5 V to 65 V
    • Robust solution with only one component crossing the isolation barrier
    • ±1% Total output regulation accuracy
    • Optional VOUT temperature compensation
    • 6-ms Internal or programmable soft start
    • Input UVLO and thermal shutdown protection
    • Hiccup-mode overcurrent fault protection
    • –40°C to +150°C Junction temperature range
  • Integration reduces solution size and cost
    • Integrated 100-V, 0.35-Ω power MOSFET
    • No opto-coupler or transformer auxiliary winding required for VOUT regulation
    • Internal loop compensation
    • Low EMI operation to meet CISPR 32
  • High efficiency PSR flyback operation
    • Quasi-resonant switching in boundary conduction mode (BCM) at heavy load
    • Low input quiescent current
    • External bias option for improved efficiency
    • Minimum load less than 0.5% of full load
  • Create a custom regulator design using WEBENCH® Power Designer

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WEBENCH® Designer LM5180

  Min   Max Range
Vin  V 4.5 to 70.0V
Vout  V 1.8 to 48V
Iout  A ≤ 2A
Ambient Temp  °C -40 to 85°C