AEW01CC48 datasheet(41/46 Pages) ASTEC

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4. Decoupling

Noise on the power distribution system is not always created by the converter.

High-speed analog or digital loads with dynamic power demands can cause

noise to cross the power inductor back onto the input lines. Noise can be

reduced by decoupling the load. In most cases, connecting a 10

µF tantalum

capacitor in parallel with a 0.1

µF ceramic capacitor across the load will

decouple it. The capacitors should be connected as close to the load as

possible.

5. Power dissipation

z Parallel Power Distribution

Following figure shows a typical parallel power distribution design. Such

designs, sometimes called daisy chains, can be used for very low output

currents, but are not normally recommended. The voltage across loads far

from the source can vary greatly depending on the IR drops along the leads

and changes in the loads closer to the source. Dynamic load conditions

increase the potential problems.

z Radial Power Distribution

Radial power distribution is the preferred method of providing power to the

load. Figure 19 shows how individual loads are connected directly to the

power source. This arrangement requires additional power leads, but it avoids

the voltage variation problems associated with the parallel power distribution

technique.

AEW01CC48 Datasheet(PDF) 41 Page - Astec America, Inc