Notification 111 - Optimization failed: Capacitance for this power level (PO) cannot be found

CATEGORY

ISSUE / RESULT

FIX / REFERENCE(S)

Failure

Optimization failed to find the required value of input capacitance (CIN).

Low input capacitance may dramatically reduce the minimum input voltage (VMIN), causing high peak current (IP for TOPSwitch-GX) or low KP (for TinySwitch-II).

The output power requirements may be too high for the available input capacitors.

• Increase capacitance (to 3 mF per watt of DC output at Universal or Single 115 VAC input, or to 1 mF per watt of DC output at Single 230 VAC input) and complete the design manually.

• Running optimization, after manually setting the input capacitance (CIN), may over-write the value of CIN you manually selected.

• See Application Notes AN-26 (-FX ) or AN-32 (-GX)  for more information on calculating the minimum input voltage (VMIN).