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LM5160A: Isolated dc/dc power supply design

Expert 5870 points
Part Number: LM5160A
Other Parts Discussed in Thread: LM34925, , LM5180


we would like to build an isolated DC/DC power supply:

  • Isolated (expected voltage difference between input and output is far below 100 V)
  • VIN  nominal 48 V (range 40 V - 50 V)
  • VOUT 4.0 V, 2.0 A max, max long term output current 1.6 A
  • Output overcurrent protection

I found candidates like LM34925 and LM5160A. One concern is that transformer is not from the shelf, but special one (?).

Can you please check requirements and suggest which type would be recommended?

Thank you.

  • Hi Bart,

    The LM5180 will be the simplest solution for this.

    Please look through the datasheet and the 5V application.

    Using the design calculator here under "Development Tools" it looks like a 4:1 transformer will  be your best choce.

    However the output power is limited (not current) so the output voltage will drop out over-current conditions.

    Try using the Design calculator and let us know what you think.

    -Orlando Murray