ISL6263CRZ-T 查看數據表（PDF） - Intersil

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ISL6263CRZ-T

5-Bit VID Single-PhaseVoltage Regulator for IMVP-6+ Santa Rosa GPU Core

Intersil 

ISL6263

The gain of the droop amplifier circuit is Equation 14:

kdroopamp

=

1

+

-R----D----R----P----2--

RDRP1

(EQ. 14)

After determining RS and RNTCEQ networks, use

Equation 15 to calculate the droop resistances RDRP1 and

RDRP2.

RDRP2

=

⎛⎛

⎜⎜

⎝⎝

D-----C-----R--R----⋅-d--G-r--o--1--o-(--p2---5----°--C----)⎠⎟⎞

⎞

– 1⎟

⎠

⋅ RDRP1

(EQ. 15)

VDD

Rdroop is 8mΩ per Intel IMVP-6+ specification and RDRP1 is

typically 1kΩ.

The effectiveness of the RNTCEQ network is sensitive to the

coupling coefficient between the NTC thermistor and the

inductor. The NTC thermistor should be placed in the closet

proximity of the inductor.

−

OCP

+

+

−

10µA ↓

OCSET

+

DROOP

−

VSUM

DFB

DROOP

VO

ROCSET

RS

VDCR

FIGURE 8. EQUIVALENT MODEL FOR DROOP CIRCUIT USING INDUCTOR DCR CURRENT SENSING

VDD

−

OCP

+

+

−

10µA ↓

OCSET

+

DROOP

−

VSUM

DFB

DROOP

VO

ROCSET

RS

VRSNS

FIGURE 9. EQUIVALENT MODEL FOR DROOP CIRCUIT USING DISCRETE RESISTOR CURRENT SENSING

15

FN9213.2

June 10, 2010

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