P9025AC FOD TUNING GUIDE
8
REVISION 08/26/15
AN-886
When the Bank# columns are comprised of black and orange numerical values, this means that the error for that
bank is above target by more than 350mW after the necessary FOD2 Offset shift has been implemented. This
means that foreign objects are expected to be capable of consuming more power than the WPC specification allows
at each load level that corresponds to an orange texted cell. In this case, the spreadsheet predicts the best Bank
to use regarding all load levels and will indicate the recommended bank by highlighting the suggested FOD1 and
FOD2 resistances to use under the Bank# row. The listed values in the FOD1 section are the largest reported power
error contained within the best fitting Bank and the system designer should determine if the error is acceptable for
the product under design.
To determine custom values, Bank 8 or Bank 9 can be adjusted using the Hexadecimal values on the PR_Banks
tab until the selected bank column no longer has red cells. IDT will refer customers to a third party support team for
programming the P9025AC with a custom FOD configuration.
Figure 4. Power Measurement Connection Diagram
Figure 5. P9025AC_FOD_Calculator.xls Measurements Entry Tab (Second data set not shown but must also
