HIP6021 datasheet(9/15 Pages) INTERSIL

9 / 15 page

2-304

A resistor (ROCSET) programs the over-current trip level for

the PWM converter. As shown in Figure 6, the internal

200

µA current sink, IOCSET develops a voltage across

ROCSET (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

µA 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

PEAK =

OCSET

DS ON

()

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

UGATE

OCSET

PHASE

OVER-

CURRENT

GATE

CONTROL

VCC

200

µA

VDS

VSET

ROCSET

VIN = +5V

OVER-CURRENT TRIP:

IOCSET

FIGURE 6. OVER-CURRENT DETECTION

PWM

DRIVE

DS ON

()

OCSET

SET

PHASE

–

OCSET

SET

–

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

HIP6021

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