Texas Instruments LMP8646 Evaluation Board LMP8646EB/NOPB LMP8646EB/NOPB 데이터 시트
제품 코드
LMP8646EB/NOPB
LMP8646EB User’s Guide
November 2011
Page 7 of 20
SNOU010
ohm
RFB
k
k
mOhm
ROUT
RFBT
V
V
RFBB
V
V
G
R
I
ROUT
RFBT
V
V
RFBB
V
ROUT
V
G
R
I
ROUT
V
G
R
I
RFBT
V
V
RFBB
V
ROUT
V
V
RFBT
V
V
RFBB
V
I
I
I
FB
O
FB
FB
ain
SENSE
FB
O
FB
FB
ain
SENSE
FB
ain
SENSE
FB
O
FB
FB
O
FB
O
FB
ROUT
RFBT
RFBB
160
74
.
157
3
10
8
.
0
6
.
0
2
8
.
0
8
.
0
10
55
575
.
1
min
_
3102
_
max
min
_
3102
_
max
max
min
_
3102
_
8646
_
min
_
3102
_
This equation provides an initial value for ROUT. To get the desired results, ROUT should be
adjusted. We recommend having an ROUT value of at least 50 ohm.
6. Step 6: Adjusting Components – capture the output current and output voltage plots and adjust the
components as necessary. The most common components to adjust are Cg to minimize the current
ripple and ROUT to decrease the current error.
A plot for the load current (black), output voltage of the LM3102 (blue), voltage the feedback pin of
the LM3102 (red), and switch frequency of the LM3102 (green), can be seen in figure 3.
ripple and ROUT to decrease the current error.
A plot for the load current (black), output voltage of the LM3102 (blue), voltage the feedback pin of
the LM3102 (red), and switch frequency of the LM3102 (green), can be seen in figure 3.
Figure 3 – Plot for the SuperCap Application