I have a requirement of DC DC power supply where the input voltage is -48VDC and output voltage : +5V and -5V with output current 4A and 3A. Is it correct to use a DC DC power supply of more than 35W and give the inputs as inverted polarity?

Thanking in advance

  • \$\begingroup\$ If the SPSU is designed for negative input that is OK (but check wthere the outputs can each deliver the required current). \$\endgroup\$ – Wouter van Ooijen Feb 22 '17 at 7:17
  • \$\begingroup\$ Use a: "isolated DC/DC converter". With those, a transformer is used and the input is not connected to the output. You may not give the input an inverted voltage. \$\endgroup\$ – Jot Feb 22 '17 at 8:34
  • \$\begingroup\$ No such thing as inverted polarity. -48 is the same as +48. \$\endgroup\$ – Misunderstood Feb 23 '17 at 1:00
  • \$\begingroup\$ @WoutervanOoijen The supply that I'm planning to use does not mention any negative input voltage range. The current rating is the required range. \$\endgroup\$ – Manisha Feb 23 '17 at 7:53
  • \$\begingroup\$ @Jot, Can I use a non isolated DC/DC converter of required specification. \$\endgroup\$ – Manisha Feb 23 '17 at 7:55

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