1
\$\begingroup\$

While designing an LM2586 SMPS circuit using the TI Workbench, the software recommended the following transformer:

SMPS Transformer

This is apparently the 749196510.

The TI workbench states that this is a 89.1uH part. However, the datasheet states that the inductance base is 9.9uH. Even if I were to connect all 3 primary windings in series, surely that would only result in 29.7uH? Is there a mistake somewhere?

\$\endgroup\$
  • \$\begingroup\$ Looks like a f$%^ up on the part of TI \$\endgroup\$ – Andy aka Nov 2 '15 at 15:25
  • 1
    \$\begingroup\$ @Andyaka But they've done it on more than one part. I tried changing the parameters of the power supply and it chose a different inductor. Same problem: it said it was a 47.7uH part, but the datasheet said the base inductance is 5.3uH. \$\endgroup\$ – Amr Bekhit Nov 2 '15 at 15:27
  • \$\begingroup\$ I think you should let the software decide on values but you do the part selection. \$\endgroup\$ – Andy aka Nov 2 '15 at 15:29
3
\$\begingroup\$

Inductance goes as turns squared, so all three primary windings in series would get you 89.1uH.

\$\endgroup\$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.