ISL6566CR-T datasheet(7/28 Pages) INTERSIL

Part #	ISL6566CR-T

Description	Three-Phase Buck PWM Controller with Integrated MOSFET Drivers for VRM9, VRM10, and AMD Hammer Applications

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Manufacturer	INTERSIL [Intersil Corporation]

Direct Link	http://www.intersil.com/cda/home

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7 / 28 page

7

FN9178.3

July 25, 2005

Timing Diagram

Simplified Power System Diagram

Functional Pin Description

VCC

VCC is the bias supply for the ICs small-signal circuitry.

Connect this pin to a +5V supply and locally decouple using

a quality 1.0

µF ceramic capacitor.

PVCC1, PVCC2, PVCC3

These pins are the power supply pins for the corresponding

channel MOSFET drive, and can be connected to any

voltage from +5V to +12V, depending on the desired

MOSFET gate drive level.

The number of active channels is determined by the state of

PVCC2 and PVCC3. Leave PVCC3 unconnected or

grounded for 2-phase operation. For 1-phase operation

leave both PVCC3 and PVCC2 unconnected or grounded.

GND

GND is the bias and reference ground for the IC.

ENLL

This pin is a threshold-sensitive (approximately 0.66V) enable

input for the controller. Held low, this pin disables controller

operation. Pulled high, the pin enables the controller for

operation. ENLL has a internal 1.0

µA pull-up to 5V.

FS

A resistor, placed from FS to ground, will set the switching

frequency. Refer to Equation 34 for proper resistor

calculation.

UGATE

LGATE

tFLGATE

tPDHUGATE

tRUGATE

tFUGATE

tPDHLGATE

tRLGATE

CHANNEL1

+5VIN

VOUT

Q1

Q2

ISL6566

CHANNEL2

Q3

Q4

DAC

5-6

VID

CHANNEL3

Q5

Q6

+12VIN

ISL6566

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ISL6566CR-T Datasheet(PDF) 7 Page - Intersil Corporation

ISL6566CR-T Datasheet(HTML) 7 Page - Intersil Corporation

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