ISL6566IRZ View Datasheet(PDF) - Intersil

Part Name

Description

MFG CO.

ISL6566IRZ

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

Intersil 

Timing Diagram

tPDHUGATE

UGATE

LGATE

tFLGATE

ISL6566

tRUGATE

Simplified Power System Diagram

+12VIN

+5VIN

5-6

VID

DAC

CHANNEL1

ISL6566

CHANNEL2

tFUGATE

tPDHLGATE

Q1

Q2

Q3

Q4

tRLGATE

VOUT

Q5

CHANNEL3

Q6

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 1.0µF 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.

8

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 1.0µA 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.

FN9178.4

March 9, 2006

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