Notification 203 - Maximum operating flux density (BM) has been exceeded

CATEGORY

ISSUE / RESULT

FIX / REFERENCE(S)

Failure

Maximum operating flux density (BM) limit has been exceeded.

Transformer core saturation and damage to the PI Device may occur.  Worst-case conditions would be high-line AC input and high ambient temperature, during startup or with an overloaded or short-circuited output.

  • Increase the core size or the cross-sectional area (AE) of the core.

  • Increase the current waveform parameter ( KP), which will decrease the primary inductance (LP).

  • Increase the number of both the primary (NP) and the secondary turns (NS).

  • Increase the reflected output voltage (VOR), by increasing NP.

  • Improve the overall efficiency (N) or decrease the peak primary current (IP); see Application Note  AN-19  for high-efficiency techniques.

  • See Application Notes AN-26 (-FX )  or AN-32 (-GX)  for details on how BM is calculated.