ISL6307AIRZ datasheet(11/33 Pages) INTERSIL

Part #	ISL6307AIRZ

Description	Ultra-high bandwidth 6-Phase PWM Controller with 8 Bit VID Code Capable of Precision RDS(ON) or DCR Differential Current Sensing

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Manufacturer	INTERSIL [Intersil Corporation]

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

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11 / 33 page

11

FN9236.0

February 6, 2006

Functional Pin Description

VCC - Supplies all the power necessary to operate the chip.

The controller starts to operate when the voltage on this pin

exceeds the rising POR threshold and shuts down when the

voltage on this pin drops below the falling POR threshold.

Connect this pin directly to a +5V supply.

GND - Bias and reference ground for the IC. The bottom

metal base of ISL6307A is the GND.

EN_PWR - This pin is a threshold-sensitive enable input for

the controller. Connecting the 12V supply to EN_PWR

through an appropriate resistor divider provides a means to

synchronize power-up of the controller and the MOSFET

driver ICs. When EN_PWR is driven above 0.875V, the

ISL6307A is active depending on status of EN_VTT, the

internal POR, and pending fault states. Driving EN_PWR

below 0.745V will clear all fault states and prime the

ISL6307A to soft-start when re-enabled.

EN_VTT - This pin is another threshold-sensitive enable

input for the controller. It’s typically connected to VTT output

of VTT voltage regulator in the computer mother board.

When EN_VTT is driven above 0.875V, the ISL6307A is

active depending on status of ENLL, the internal POR, and

pending fault states. Driving EN_VTT below 0.745V will clear

all fault states and prime the ISL6307A to soft-start when re-

enabled.

FS - Use this pin to set up the desired switching frequency. A

resistor, placed from FS to ground will set the switching fre-

quency. The relationship between the value of the resistor

and the switching frequency will be described by an approxi-

mate Equation 40.

SS - Use this pin to set up the desired start-up oscillator fre-

quency. A resistor, placed from SS to ground will set up the

soft-start ramp rate. The relationship between the value of the

resistor and the soft-start ramp up time will be described by

an approximate Equation 14.

VID7, VID6, VID5, VID4, VID3, VID2, VID1 and VID0 -

These are the inputs to the internal DAC that provide the

reference voltage for output regulation. Connect these pins

either to open-drain outputs with or without external pull-up

resistors or to active pull-up outputs. VID7-VID0 have 40µA

internal pull-up current sources that diminish to zero as the

voltage rises above the logic-high level. These inputs can be

pulled up as high as VCC plus 0.3V.

When a VID code causes a shut-off, the controller needs to

be reset before it will start again.

VSEN and RGND - VSEN and RGND form the precision

differential remote-sense amplifier. This amplifier converts

the differential voltage of the remote output to a single-ended

voltage referenced to local ground. Connect VSEN and

RGND to the sense pins of the remote load.

VDIFF - VDIFF is the amplifier’s output and the input to the

regulation and protection circuitry. It should be connected to

FB through a resistor.

FB and COMP - Inverting input and output of the error

amplifier respectively. FB is connected to VDIFF through a

resistor. A negative current, proportional to output current is

present on the FB pin. A properly sized resistor between

VDIFF and FB sets the load-line (droop). The droop scale

factor is set by the ratio of the ISEN resistors and the lower

MOSFET RDS(ON). COMP is tied back to FB through an

external R-C network to compensate the regulator.

DAC and REF - The DAC output pin is the output of the

precision internal DAC reference. The REF input pin is the

positive input of the Error Amp. In typical applications, a 1k

Ω,

1% resistor is used between DAC and REF to generate a

precise offset voltage. This voltage is proportional to the

offset current determined by the offset resistor from OFS to

ground or VCC. A capacitor is used between REF and

ground to smooth the voltage transition during Dynamic

VID™ operations.

PWM1, PWM2, PWM3, PWM4, PWM5, PWM6 - Pulse-

width modulation outputs. Connect these pins to the PWM

input pins of the Intersil driver IC. The number of active

channels is determined by the state of PWM3, PWM4,

PWM5 and PWM 6. Tie PWM3 to VCC to configure for

2-phase operation. Tie PWM4 to VCC to configure for

3-phase operation. Tie PWM5 to VCC to configure for

4-phase operation. Tie PWM6 to VCC to configure for

5-phase operation.

ISEN1+, ISEN1-; ISEN2+, ISEN2-; ISEN3+, ISEN3-;

ISEN4+, ISEN4-; ISEN5+, ISEN5-; ISEN6+, ISEN6- - The

ISEN+ and ISEN- pins are current sense inputs to individual

differential amplifiers. The sensed current is used as a

reference for channel balancing, protection, and regulation.

Inactive channels should have their respective current sense

inputs left open (for example, for 3-phase operation open

ISEN4+).

For DCR sensing, connect each ISEN- pin to the node

between the RC sense elements. Tie the ISEN+ pin to the

other end of the sense capacitor through a resistor, RISEN.

The voltage across the sense capacitor is proportional to the

inductor current. The sense current is proportional to the

output current, and scaled by the DCR of the inductor and

RISEN.

When configured for RDS(ON) current sensing, the ISEN1-,

ISEN2-, ISEN3-, ISEN4-, ISEN5-, ISEN6- pins are grounded

at the lower MOSFET sources. The ISEN1+, ISEN2+,

ISEN3+, ISEN4+, ISEN5+, ISEN6+ pins are then held at a

virtual ground, such that a resistor connected between them,

and the drain terminal of the associated lower MOSFET, will

carry a current proportional to the current flowing through

that channel. The current is determined by the negative

ISL6307A

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ISL6307AIRZ Datasheet(PDF) 11 Page - Intersil Corporation

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