Texas Instruments Evaluation Board for the LM5019 LM5019EVAL/NOPB LM5019EVAL/NOPB 데이터 시트
제품 코드
LM5019EVAL/NOPB
40 mV
Cr = 3300 pF
(V
IN(MIN)
±
V
OUT
)T
ON
C
ac
= 100 nF
Rr x Cr <
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
Table 1. Bill of Materials
Item
Description
Mfg., Part Number
Package
Value
C5
Ceramic Capacitor
Kemet, C0805C104K1RACTU
0805
0.1uF, 100V, X7R
C7
Ceramic Capacitor
TDK, C2012X7R1C105K
0805
1uF, 16V, X7R
C8
Ceramic Capacitor
Murata, GRM188R71E104KA01D
0603
0.1uF, 25V, X7R,
0603
C9
Ceramic Capacitor
Murata, GRM21BR61E475KA12L
0805
4.7uF, 25V, X5R
D2
Diode
Diodes, Inc., SDM10U45–7–F
SOD-523
Schottky, 45V,
0.1A
Inductor
Bourns, SRR0603–221kL
6.5mm x 6.5mm
220uH, 0.310A
L1
Alternate Inductor
Wurth, 744053221
5.8mm x 5.8mm
220uH, 0.290A
Alternate Inductor
Coilcraft, LPS5030–224
5mm x 5mm
220uH, 0.245A
R1
Resistor
Vishay-Dale, CRCW08056K98FKEA
0805
220uH, 0.6A
R2
Resistor
Vishay-Dale, CRCW08051R50FKEA
0805
1.50 ohm, 1%,
0.125W
R3
Resistor
Vishay-Dale, CRCW0805237KFKEA
0805
237k ohm, 1%,
0.125W
R5
Resistor
Vishay-Dale, CRCW0805127KFKEA
0805
127k ohm, 1%,
0.125W
R6
Resistor
Vishay-Dale, CRCW08051K00FKEA
0805
1.00k ohm, 1%,
0.125W
R7
Resistor
Vishay-Dale, CRCW080514K0FKEA
0805
14.0k ohm, 1%,
0.125W
U1
Sync Switching
Texas Instruments, LM5019
SO PowerPAD-8
100V, 100 mA
Regulator
5
Ripple Configuration
The LM5019 is a constant-on-time (COT) buck, and requires adequate ripple at feedback (FB) node.
Three commonly used ripple generation methods are shown in
Three commonly used ripple generation methods are shown in
.
The LM5019 evaluation board has been supplied with reduced ripple configuration (Type 2). For more
information on ripple configuration, refer to LM5019 datasheet.
information on ripple configuration, refer to LM5019 datasheet.
Table 2. Ripple Configuration
Type 1
Type 2
Type 3
Lowest Cost Configuration
Reduced Ripple Configuration
Minimum Ripple Configuration
C8 open. Select R2:
Select R2 and C8:
(Not on Board)
(4)
(5)
(6)
3
SNVA647A – May 2012 – Revised April 2013
AN-2238 LM5019 Buck Evaluation Board
Copyright © 2012–2013, Texas Instruments Incorporated