Datasheet

TPS40305/HPA488Rev A

Vin=14V,Vout=1.8V,Iout=10 A

OutputRipple

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TPS40305EVM-488 Assembly Drawings and Layout

6.6 Additional Waveforms

6.6.1 Output Ripple with Frequency Spread Spectrum (FSS) Enabled

Frequency Spread Spectrum varies the output switching frequency. This change in switching frequency

can produce a small change in the output voltage at the modulation frequency. Figure 10 shows the

approximately 50mV modulation of the output voltage generated when Frequency Spread Spectrum is

enabled.

Figure 10. TPS40305EVM-488 Output Ripple with FSS Enabled

7 TPS40305EVM-488 Assembly Drawings and Layout

The following figures (Figure 11 through Figure 16) show the design of the TPS40305EVM-488 printed

circuit board. The EVM has been designed using a 4-layer, 2oz. copper-clad circuit board 2.5" × 2.5" with

all populated components on the top to allow the user to easily view, probe and evaluate the TPS40305

control IC in a practical double-sided application. Moving components to both sides of the PCB or using

additional internal layers can offer additional size reduction for space constrained systems.

SLUU406–February 2010 TPS40305EVM-488

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