CS5305GDWR28 datasheet(23/33 Pages) ONSEMI

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CS5305

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3kW w RSHARE N

where N is the maximum number of modules that can be

placed in parallel as defined by the designer. As an

example, if ten is the maximum number of modules that

may be paralleled, then the minimum value of RSHARE

should be 30 kΩ.

The share resistor should also not be made too large, since

this is the only pull−down on the SHARE lead. Transient

response of the share bus is limited by the RC time constant

of the share resistance and any parasitic capacitance found

on the SHARE line between modules.

Droop Components

The CS5305 offers adaptive voltage positioning. This

feature allows the output voltage to be set at different levels

according to the amount of current being provided by the

module. The output voltage is somewhat higher than

nominal under no load or light load conditions and

somewhat lower than nominal under heavy load conditions.

Both set points must fall within the Power Good window.

The adaptive positioning allows for overshoot and

undershoot conditions that occur during load current

transients and results in a reduction in the peak−to−peak

VOUT voltage excursion during load current transients.

Three components are required to implement DC

adaptive voltage positioning. Resistor RFB is connected

between the module VOUT(SENSE)+ lead and the VFB lead.

Resistor RDRP is connected between the VDRP lead and

VFB lead. Resistor RVSENSE is connected between the

VOUT(SENSE)+ lead and the module VOUT lead. These

connections are shown in Figure 39.

Figure 39.

RDRP

RFB

RVSENSE

VOUT

VOUT(SENSE)+

VFB

VDRP

The first step in choosing these components is to select the

appropriate no−load and full−load output voltage set points

for the particular DAC code being used. Additionally, the

values of ROSC and ROCSET should be known, as should

ESR of the output inductors and the full−load output current.

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