Texas Instruments TPS61085 Evaluation Module TPS61085EVM-355 TPS61085EVM-355 Fiche De Données
Codes de produits
TPS61085EVM-355
www.ti.com
Schematic, Bill of Materials, and Board Layout
3.2
Bill of Materials
Table 3. HPA355A Bill of Materials
Count
RefDes
Value
Description
Size
Part Number
MFR
1
C1
10
m
F
Capacitor, Ceramic, 10V, X7R or X5R, 10%
0805
GRM21BR71A106KE51
Murata
2
C2, C3
10
m
F
Capacitor, Ceramic, 25V, X7R, 20%
1210
TMK325BJ106MN
Taiyo Yuden
1
C4
1
m
F
Capacitor, Ceramic, 10V, X7R, 10%
0805
GRM21BR71A105KA01
Murata
1
C5
3.3 nF
Capacitor, Ceramic, 10V, X7R, 10%
0805
Std
Std
1
C6
33 nF
Capacitor, Ceramic, 10V, X7R, 20%
0805
Std
Std
0
C7
open
Capacitor, Ceramic, 10V, X7R, 20%
0805
Std
Std
1
D1
PMEG2010AEH
Diode, Schottky, 20V, 1A
SOD123
PMEG2010AEH
Vishay
1
L1
3.3
m
H
Inductor, 3.3A, 30 m
Ω
0.276 x 02.87 inch
7447789003
Wurth Elektronik
1
R1
2040k (232k)
Resistor, Chip, 1/10W, 1%
0805
Std
Std
1
R2
27k (267k)
Resistor, Chip, 1/10W, 1%
0805
Std
Std
1
R3
13k
Resistor, Chip, 1/10W, 1%
0805
Std
Std
1
U1
TPS61085PW
IC, 600kHz/1.2MHz Step-Up DC-DC Converter
TSSOP-8
TPS61085PW
TI
3.3
Board Layout
This section provides the TPS61085EVM board layout and illustrations.
3.3.1
Layout
Board layout is critical for all switch-mode power supplies.
, and
show the
board layout for the HPA355 PCB. The switching nodes with high-frequency noise are isolated from the
noise-sensitive feedback circuitry, and careful attention has been given to the routing of high-frequency
current loops. See the data sheet for further layout guidelines.
noise-sensitive feedback circuitry, and careful attention has been given to the routing of high-frequency
current loops. See the data sheet for further layout guidelines.
The empty pads, located to the right of the inductor, allow for easier measurement of the inductor current
using a current probe. Desolder the inductor, rotate it by 90° and solder it to the additional pads. Then use
a wire from the top pad to the input pad to close the current path again.
using a current probe. Desolder the inductor, rotate it by 90° and solder it to the additional pads. Then use
a wire from the top pad to the input pad to close the current path again.
5
SLVU265A – August 2008 – Revised October 2010
TPS61085EVM
Copyright © 2008–2010, Texas Instruments Incorporated