User Manual
20 of 37
Revision 1.0
2018-08-23
EVAL-M1-CTF620N3 User Manual
iMOTION
™
Modular Application Design Kit
Hardware description of EVAL-M1-CTF620N3
Figure 15 depicts IU+ current feedback sensing circuity on EVAL-M1-101T evaluation board. Please note that the
default external amplification gain is less than 1 for current sense in this evaluation board.
Figure 15 The part of Current feedback on the EVAL-M1-101T evaluation board
Based on the principle of Kirchhoff's voltage law,
≈
≈
(
−
∗
)
∗
+
+
∗
=
+
+
+
∗
=
+
=
5
6
Based on this calculation, the current input for the MADK combination of EVAL-M1-101T and EVAL-M1-
CTF620N3 is 25mV/A.
Please use same procedure to calculate the current input for other combinations of MADK boards and enter it
into MCEWizard as shown in Figure 16.
Figure 16 Current feedback configuration in MCEWizard for EVAL-M1-101T and EVAL-M1-CTF620N3
R7
2k, 1%
C15
220pF
IU+
R6
10k, 1%
+3.3V
R8
100R
IU
6
iMOTION
Controller
Rsh
Current shunt
resistor on power
board
V2
Ish
V1