Pfc External Current Feedback Configuration And Calculation - Infineon iMOTION EVAL-M3-IM564 User Manual

EVAL-M3-IM564 User Manual
iMOTION™ Modular Application Design Kit
Hardware description of EVAL-M3-IM564
188 or IRMCF188, power board EVAL-M3-IM564 should be modified by assembling 1 MΩ AC voltage sensing
resistors R2A and R10A and removing the resistors R2 and R10.
4.1.3

PFC external current feedback configuration and calculation

The PFC shunt resistor RS3 is 5 mΩ for EVAL-M3-IM564. But for control board EVAL-M3-102T, the current input
value is product of the shunt resistance in milliohms and gain of external current sense amplifier as shown in
Figure 14.
Figure 14 PFC current shunt feedback and sample timing
Figure 15 depicts PFC current feedback-sensing circuitry on the EVAL-M3-102T evaluation board. Please note
that the default external amplification gain is less than 1 for current sense in this evaluation board.
EVAL-M3-IM564
Figure 15 The PFC current feedback circuit for EVAL-M3-102T evaluation board
Based on this calculation, the PFC current measurement input scaling of EVAL-M3-IM564 is 120 mV/A. Please
use the same procedure to calculate the current input for other combinations of MADK boards and enter it into
MCEWizard.
User Manual
IPFC
R25 change to 0 ohm
EVAL-M3-102T
= = 12
+
22 of 47
Delete R6
Revision 1.4
2020-07-16