PSR flyback converters offers a reliable, simple and high-density design

16-06-2020 | Texas Instruments | Power

Texas Instruments LM5181/LM5181-Q1 Primary-Side Regulated (PSR) Flyback Converters are provided with high efficiency over a broad input voltage range of 4.5V to 65V. The isolated output voltage is sampled from the primary-side flyback voltage, removing the requirement for an optocoupler, voltage reference, or third winding from the transformer for output voltage regulation.


The high level of integration provides a reliable, simple, and high-density design with only one component crossing the isolation barrier. Boundary conduction mode switching allows a compact magnetic solution and better than ±1.5% load and line regulation performance. An integrated 100V power MOSFET gives output power up to 4W with enhanced headroom for line transients.


The flyback converters are available in an 8-pin, 4mm x 4mm, thermally-enhanced WSON package with a 0.8mm pin pitch. The devices are AEC-Q100 qualified for automotive applications.


Typical applications include 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, and isolated bias supplies.

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