User Manual
20
<Revision 1.0>
EVAL-M3-TS6-665PN User Manual
iMOTION™ Modular Application Design Kit
Hardware description of EVAL-M3-TS6-665PN
Figure 14
The PFC Current feedback circuit for EVAL-M3-102T evaluation board
Based on the principle of Kirchhoff's voltage law,
𝑉𝑉
4
≈ 𝑉𝑉
3
≈
(
𝑉𝑉
𝐷𝐷𝐷𝐷
+
𝐼𝐼
𝑠𝑠ℎ
∗ 𝑅𝑅
𝑠𝑠ℎ
)
∗
𝑅𝑅
25
𝑅𝑅
6
+
𝑅𝑅
25
− 𝐼𝐼
𝑠𝑠ℎ
∗ 𝑅𝑅
𝑠𝑠ℎ
=
𝑅𝑅
25
𝑅𝑅
6
+
𝑅𝑅
25
𝑉𝑉
𝐷𝐷𝐷𝐷
−
𝑅𝑅
6
𝑅𝑅
6
+
𝑅𝑅
25
𝑅𝑅
𝑠𝑠ℎ
∗ 𝐼𝐼
𝑠𝑠ℎ
𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶
𝑖𝑖𝐶𝐶𝑖𝑖𝐶𝐶𝐶𝐶
=
𝑅𝑅
6
𝑅𝑅
6
+
𝑅𝑅
25
𝑅𝑅
𝑠𝑠ℎ
=
12
13
𝑅𝑅
𝑠𝑠ℎ
Based on this calculation, the current input for the MADK combination of EVAL-M3-102T and EVAL-M3-TS6-
665PN is 92.3 mV/A. Please use same procedure to calculate the current input for other combinations of MADK
boards and enter it into MCEWizard.
5.1.4
PFC Overcurrent protection circuit and PFC Gatekill configuration
PFC protection circuit for EVAL-M3-TS6-665PN as shown in Figure 15, but the left side of RS4 is negative. If the
bus current Ibus is larger than the setting value, the output PFCGK of U2 will be trigger low and be active.
Figure 15
PFC protection Circuit on the EVAL-M3-TS6-665PN evaluation board
RS4
100mohm
R33
24R
R32
24R
IPFC-
IPFC+
R51
10
R45
1k
R39
3.7k
R34
1k
R46
51k
R44
10k
C13
10uf
C11
102
3.3V
3.3V
PFCGK
C10
102
C14
103
C8
2200P
OUT
1
1
IN1
-
2
IN2
+
3
COM
4
V
cc
8
OUT
2
7
IN2
-
6
IN2
+
5
U2
LM393
<201
9
-0
6
-
05
>