Texas Instruments LM25019 Wide Vin Synchronous Step-down Regulator Evaluation Module LM25019MR-EVM LM25019MR-EVM Scheda Tecnica
Codici prodotto
LM25019MR-EVM
25 mV
C4 = 3300 pF
R5 x C4
(V
IN(MIN)
±
V
OUT
)T
ON
C7 = 100 nF
<
û
I
L
25 mV
C7
5
R4
>
g
SW
(R
3
|| R
6
)
>
V
REF
25 mV
R4 >
û
I
L
(MIN)
V
OUT
x
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
GND
R
r
C
ac
To FB
L1
C
OUT
R
FB2
R
FB1
V
OUT
C
r
Ripple Configuration
6
Ripple Configuration
The LM25019 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
LM25019 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 1. Ripple Configuration
Type 1
Type 2
Type 3
Lowest Cost Configuration
Reduced Ripple Configuration
Minimum Ripple Configuration
R5, C4, C7 open. Select R4:
R5 open, C4 = 0
Ω
. Select R4 and C7:
R4 = 0
Ω
. Select R5, C4, and C7:
(4)
(5)
(6)
4
LM25019 Evaluation Board
SNVU225 – April 2013
Copyright © 2013, Texas Instruments Incorporated