Texas Instruments Evaluation Board for the LM5017 LM5017EVAL/NOPB LM5017EVAL/NOPB Scheda Tecnica
Codici prodotto
LM5017EVAL/NOPB
40 mV
C6 = 3300 pF
R4 x C6
(V
IN(MIN)
±
V
OUT
)T
ON
C8 = 100 nF
<
û
I
L
40 mV
C8
5
R2
>
g
SW
(R
1
|| R
6
)
>
V
REF
40 mV
R2 >
û
I
L
(MIN)
V
OUT
x
GND
R
r
C
ac
To FB
L1
C
OUT
R
FB2
R
FB1
V
OUT
C
r
GND
To FB
L1
C
OUT
R
FB2
R
FB1
V
OUT
R
C
GND
To FB
L1
C
OUT
R
FB2
R
FB1
V
OUT
R
C
C
ac
Ripple Configuration
5
Ripple Configuration
The LM5017 is a COT buck and requires adequate ripple at feedback (FB) node. Three commonly used
ripple generation methods are shown in
ripple generation methods are shown in
LM5017 evaluation board has been supplied with minimum ripple configuration (Type 3), but can be
configured to Type 1 or Type 2 with modifications as suggested in
configured to Type 1 or Type 2 with modifications as suggested in
Table 2. Ripple Configuration
Type 1
Type 2
Type 3
Lowest Cost Configuration
Reduced Ripple Configuration
Minimum Ripple Configuration
R4, C6, C8 open. Select R2:
R4 open, C6 = 0
Ω
. Select R2 and C8:
R2 = 0
Ω
. Select R4, C6, and C8:
(4)
(5)
(6)
4
AN-2200 LM5017 Evaluation Board
SNVA612B – January 2012 – Revised April 2013
Copyright © 2012–2013, Texas Instruments Incorporated