Notification 302 - KP is below the absolute-minimum- limit value (TinySwitch-II)

CATEGORY

ISSUE / RESULT

FIX / REFERENCE(S)

Error

The calculated value of KP is less than the absolute minimum limit value.

Transformer design is not feasible when KP is so low.

• Increase the size of the TinySwitch-II  device, or use a TOPSwitch family
  (See TOP232-234 and TOP242-250 Data Sheets ) device.

• Increase the reflected output voltage (VOR).

• Increase the minimum AC input voltage (VACMIN) and/or increase the input capacitance (CIN).  This will produce a higher minimum input voltage (VMIN).

• Increase the overall efficiency (N) of the design, which will increase KP.