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EVAL-M7-D112T user guide
iMOTION™ evaluation board for smart driver
System and functional description
Based on the PFC current feedback circuit of this evaluation board, if, for example, R1 is 22 kΩ and R2 is 3.9 kΩ,
then the PFC gain will be 0.849.
Figure 7
PFC current feedback gain and offset
2.2.2.2
PFC offset voltage calculation
From Figure 7, users can also estimate the offset voltage that needs to be entered into the wizard. This
parameter is the voltage, in mV, at the current sense pin when the shunt current is zero. Using the evaluation
board's design example where R1 is 22 kΩ and R2 is 3.9 kΩ, the offset voltage will be:
Based on the current PFC external passive gain configuration, selecting the PFC internal gain as 6 in the iSD tool
is recommended.
��_������ =
R2
��
=
× ��
=
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����
R1 + R2
��1
��1 + ��2
3.9
× 5 = 0.7529 �� = 752.9 ����
22 + 3.9
14
V1.0
2023-6-30
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