HIP6021 datasheet(9/15 Pages) RENESAS

9 / 15 page

HIP6021

FN4684 Rev 1.00

Page 9 of 15

March 8, 2005

(VSET) that is referenced to VIN. The DRIVE signal enables

the over-current comparator (OVER-CURRENT). When the

voltage across the upper MOSFET (VDS) exceeds VSET, the

over-current comparator trips to set the over-current latch.

Both VSET and VDS are referenced to VIN and a small

capacitor across ROCSET helps VOCSET track the variations

of VIN due to MOSFET switching. The over-current function

will trip at a peak inductor current (IPEAK) determined by:

The OC trip point varies with MOSFET’s rDS(ON) temperature

variations. To avoid over-current tripping in the normal

operating load range, determine the ROCSET resistor from

the equation above with:

1. The maximum rDS(ON) at the highest junction temperature.

2. The minimum IOCSET from the specification table.

3. Determine IPEAK for IPEAK > IOUT(MAX) + (I)/2, where I

is the output inductor ripple current.

For an equation for the ripple current see the section under

component guidelines titled ‘Output Inductor Selection’.

OUT1 Voltage Program

The output voltage of the PWM converter is programmed to

discrete levels between 1.3VDC and 3.5VDC. This output

(OUT1) is designed to supply the core voltage of Intel’s

advanced microprocessors. The voltage identification (VID)

pins program an internal voltage reference (DACOUT) with a

TTL-compatible 5-bit digital-to-analog converter. The level of

DACOUT also sets the PGOOD and OVP thresholds. Table 1

specifies the DACOUT voltage for the different combinations of

connections on the VID pins. The VID pins can be left open for

a logic 1 input, because they are internally pulled up to an

internal voltage of about 5V by a 10

A current source.

Changing the VID inputs during operation is not recommended

and could toggle the PGOOD signal and exercise the over-

voltage protection. ‘11111’ VID pin combination disables the IC

and opens the PGOOD pin.

FIGURE 5. OVER-CURRENT OPERATION

TIME

10V

OVERLOAD

APPLIED

FAULT

REPORTED

COUNT

= 1

COUNT

= 2

COUNT

= 3

IPEAK =

IOCSET ROCSET



rDS ON



----------------------------------------------------

UGATE

OCSET

PHASE

OVER-

CURRENT

GATE

CONTROL

VCC

200

A

VDS

VSET

ROCSET

VIN = +5V

OVER-CURRENT TRIP:

IOCSET

FIGURE 6. OVER-CURRENT DETECTION

PWM

DRIVE

iD rDS ON





IOCSET ROCSET



VDS VSET

VPHASE VIN VDS

–

VOCSET VIN VSET

–

TABLE 1. OUT1 VOLTAGE PROGRAM

PIN NAME

NOMINAL

DACOUT

VOLTAGE

VID4

VID3

VID2

VID1

VID0

01111

1.30

01110

1.35

01101

1.40

01100

1.45

01011

1.50

01010

1.55

01001

1.60

01000

1.65

00111

1.70

00110

1.75

00101

1.80

00100

1.85

00011

1.90

00010

1.95

00001

2.00

00000

2.05

11111

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