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PMP15006: Secondary Side Voltage too low

Part Number: PMP15006

Dear all,

I have been trying to build a circuit according to the PMP15006 reference design.

The design parameters are as follows:

  • One isolated output at 5V, max. 250 mA.
  • Small board layout
  • Input from 24V standard industrial rail

During testing I experienced that the Voltage at the secondary side never exceeds 2.4V. And during operation, the Coil gets very hot so I have to cut power.

As far as I can say I followed the schematic of the reference design. The PCB layout is different. You will find those attached.

Any help is appreciated,

Björn Ellensohn

flybuck converter.pdf