Fly-Buck Bias Solution for MCU and RS-485 (PMP9474)

The PMP9474 reference design is Fly-Buck solution, with two outputs, one non-isolated power supply, 3.3V@300mA, for MCU, one isolated power supply, 5V@100mA, for RS-485. The most important feature of this design is ultra compact solution size, which is only 26mmx14.5mm. The design uses the LM5017 synchronous buck converter configured as a Fly-Buck regulator. With the benefit of primary side regulation, the supply has the output regulated without the opto-coupler or additional transformer winding. The LM5017 has a wide Vin range which is up to 100V and 600mA output current capability with integrated switch FETs. The input voltage to the reference board can be loosely regulated with a range of 18V to 36V.


One non-isolated 3.3V output, one isolated 5V output; Fly-Buck converter design; Ultra compact size, only 26mm x 14.5mm; 83% peak efficiency. LM5017 sync buck regulator, up to 100V wide Vin range, 600mA capability This circuit board is tested, and the design files and test report are included.


Схемы и диаграммы

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Тесты и симуляция

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Спецификация (BOM)

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Fly-Buck Bias Solution for MCU and RS-485 PMP9474