Datasheet
40 mV
C6 = 3300 pF
R4 x C6
(V
IN(MIN)
± V
OUT
)T
ON
C8 = 100 nF
<
ûI
L
40 mV
C8
5
R2
>
g
SW
(R
1
|| R
6
)
>
V
REF
40 mV
R2 >
ûI
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
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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 Table 2.
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 Table 2.
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
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