Datasheet

t-Time-1 s/divm
SW
I
L
Low
20V/div
200mA/div
200mA/div
50mV/div
V
OUT-AC
I
L
High
3 Board Layout
3.1 Layout
Board Layout www.ti.com
Figure 7. PWM Operation at 200 mA With V
IN
= 9 V
This section provides the TPS61170EVM board layout and illustrations.
Board layout is critical for all switch-mode power supplies. Figure 8 , Figure 9 , and Figure 10 show the
board layout for the HPA316 printed-circuit board. The switching nodes with high-frequency noise are
isolated from the noise-sensitive feedback circuitry. Careful attention has been given to the routing of
high-frequency current loops. See the data sheet for further layout guidelines.
8 TPS61170EVM-316 SLVU250A – July 2008 – Revised September 2008
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