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If jitter is observed on the phase signal of the regulator, then noise may be entering the feedback interface
and a capacitive filter may be required. The EVM provides a 47pF-capacitor across the low-side feedback
resistors. Typically 47pF to 100pF is sufficient to filter any noise issues.
3 Board Layout
Figure 6, Figure 7, Figure 8, and Figure 9 show the board layout for the TPS4335xEVM PWB. Figure 10
displays the schematic.
The TPS4335x controller offers high efficiency, but does dissipate power. The PowerPAD package offers
an exposed thermal pad to enhance thermal performance. This must be soldered to the copper landing on
the PCB for optimal performance. The PCB provides 1 oz copper planes on the top and bottom to
dissipate heat.
4
TPS4335xEVM Evaluation Module SLVU484– June 2011
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