ISL6244 데이터 시트보기 (PDF) - Intersil

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ISL6244

Multi-Phase PWM Controller

Intersil 

ISL6244

Theory of Operation

Multi-Phase Power Conversion

Microprocessor load current profiles have changed to the

point where the multi-phase power conversion advantage is

pronounced. The technical challenges associated with

producing a single-phase converter which is both cost-

effective and thermally viable have forced a change to the

cost-saving approach of multi-phase. The ISL6244 controller

helps reduce the complexity of implementation by integrating

vital functions and requiring minimal output components.

The block diagram in Figure 12 provides a top level view of

multi-phase power conversion using the ISL6244 controller.

VID4

VID3

VID2

VID1

VID0

FB

COMP

OFS

VDIFF

VSEN

RGND

IOUT

PGOOD

VCC

EN

FS

1.23V

DYNAMIC

VID

DAC

UV

e/a

x 0.2

100µA

6V

POR

AND

SOFT START

OSCILLATOR

AND

SAWTOOTH

+

+

-

+

+-

+

+-

+

+-

OV

2.2V

OC

diff

AVERAGE

1/N

+

+

+

+

I1

I2

CURRENT

SENSE

&

I3 PHASE

DETECT

I4

VFF

PWM1

PWM2

PWM3

PWM4

ISEN1

ISEN2

ISEN3

ISEN4

N PHASES

85µA

GND

FIGURE 12. BLOCK DIAGRAM

9

FN9106.3

December 28, 2004

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