Texas Instruments TPS6227xEVM-306, User Manual

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VOUT
0.9 V
1.15 V
0.9 V
VSEL
200 mV/div
2 V/div
V = 3.6 V,
R = 3.3
I
Load
W
20 s/div m
5 Board Layout
Board Layout
Figure 7. VSEL Output Voltage Response, V
I
= 3.6 V, R
Load
= 3.3
Ω
This section provides the TPS6227XEVM-306 board layout and illustrations.
Board layout is critical for all high frequency switch mode power supplies. Figure 8 through Figure 10
show the board layout for the TPS6227XEVM-306 printed wire board (PWB). The nodes with high
switching frequencies and currents are kept as short as possible to minimize trace inductance. Careful
attention has been given to the routing of high frequency current loops and a single point grounding
scheme is used. See the TPS62270 data sheet (
SLVS799 ), 2.25 MHz 400-mA Step Down Converter With
Selectable VOUT , for specific layout guidelines.
6 TPS6227xEVM-306 SLVU234 – February 2008
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