Notification 228 - Wire gauge size (AWG) is higher than recommended maximum 

CATEGORY

ISSUE / RESULT

FIX / REFERENCE(S)

Information

The primary wire gauge (AWG) is higher than the recommended maximum.

 

Transformers designed with fine wire may be difficult to manufacture, as such fine wire often breaks during the winding process.  Check with your magnetics vendor to verify whether or not they can produce transformers of consistent quality using such fine gauge wire.

  • Select a thicker wire gauge

  • See Application Notes AN-26 (-FX)  or AN-32 (-GX)  for details on AWG calculations.

 

Recommended primary layers

Power (PO)

L (max)

20 W - 40 W

3.0

> 40 W

2.0 *

Table 1. PI Expert recommended primary layers versus output power levels. *Split primary layers are recommended above 40W.

 

PI-1689-111695

Figure 1. Example of split primary construction to reduce primary leakage inductance [ Application Note AN-19  ]