ISL6266A_15 Datasheet, PDF(29/31 Page) Intersil Corporation – Two-phase Core Controllers(Montevina, IMVP-6+)

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ISL6266A_15 Datasheet, PDF (29/31 Pages) Intersil Corporation – Two-phase Core Controllers(Montevina, IMVP-6+)

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ISL6266, ISL6266A

10ÂµA

INTERNAL TO

ISL6266A

OCSET

+Voc -Roc

DROOP

VSUM

DFB

DROOP

VSUM

Cn -

RSEQV = R---2--S---

VrsenseEQV = IOUT ï´ R-----s----e--2--n----s----e--

VDIFF

RTN VSEN

VO'

ROEQV = R----2-O---

FIGURE 42. EQUIVALENT MODEL FOR DROOP AND DIE SENSING USING DISCRETE RESISTOR SENSING

VOC. Once the droop voltage is greater than VOC, the PWM

drives will turn off and PGOOD will go low.

The selection of ROC is given in Equation 37. Assuming an

overcurrent trip level, IOC, of 55A, and knowing from the Intel

specification of the load line slope, Rdroop = 0.0021 (V/A),

ROC is calculated by Equation 37.

ROC = -I-O-----C----1-ï·--0--R--ï---d-A--r---o---o---p- = 5---1-5---0--ï·---ï·-0---1.--0-0--0--â--2-6--1-- = 11.5kï

(EQ. 37)

Note, if the droop load line slope is not -0.0021 (V/A) in the

application, the overcurrent setpoint will differ from

predicted. In addition, due to the saturation limitations of the

DROOP amplifier, there is a maximum way-overcurrent

(WOC) set point for each VID code. The maximum OC set

point that will ensure WOC can be reached is expressed in

Equation 38:

IOC = -2---.-1-5---.-ï7---R-5----Dâ----R-V---O--I--D-O----P--

(EQ. 38)

The WOC limitation is only problematic at very high VID

settings (~1.350V and above).

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FN6398.4

August 25, 2015

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