User Manual
24 of 45
Revision 1.0
2019-09-17
EVAL-M3-IM564 User Manual
iMOTION
™
Modular Application Design Kit
Hardware description of EVAL-M3-IM564
Figure 21 Current shunt feedback and sample timing for EVAL-M3-102T
The External Amplifier Gain circuit can be found in the schematics or User Manual for the control board (For
example, EVAL-M3-102T see Figure 22).
Figure 22 depicts IU+ current feedback sensing circuity on EVAL-M3-102T Evaluation board. Please note that the
default external amplification gain is less than 1 for current sense in this Evaluation board.
Figure 22 The part of Current feedback on the EVAL-M3-102T Evaluation board
Based on the principle of Kirchhoff's voltage law,
≈
≈
(
−
∗
)
∗
+
+
∗
=
+
+
+
∗
=
+
=
5
6
Based on this calculation, and included the power board amplifier gain as well, the current input for the MADK
combination of EVAL-M3-102T and EVAL-M3-IM564 is 41.667 mV/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 23.
R12
100ohm 1/10W 1%
R13
2Kohm 1/10W 1%
R10
10Kohm 1/10W 1%
C21
220pF
+3.3V
IU+
Rsh
Ish
iMOTION
Controller
IU
18
V1
V2
Current shunt resistor
on power board