Description

The PMP9409 reference design is an 4-output isolated Fly-Buck power supply for PLC applications. It takes 24V nominal input and provides 4 isolated sets of (+15V) bias voltage: Each rail has a load of 30mA. Each set of rails is generated from one single transformer windings on the secondary side. A compact solution size is achieved (56x43mm). The design features the LM5017 synchronous buck converter configured as a Fly-Buck regulator. With the benefit of primary side regulation: the supply has the outputs 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 17V to 36V.