Primary-side regulated flyback converter with high efficiency
The LM5180 from Texas Instruments is a primary-side regulated (PSR) flyback converter with high efficiency over a wide input voltage range of 4.5 to 65V. 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 100V power MOSFET provides output power up to seven watts with enhanced headroom for line transients.
The LM5180 converter simplifies implementation of isolated DC/DC supplies with optional features to optimise 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 an eight-pin, four by four millimetre, thermally-enhanced WSON package with 0.8mm pin pitch.
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