HIP6004ECBZ datasheet(7/14 Pages) RENESAS

7 / 14 page

HIP6004E

FN4997 Rev 3.00

Page 7 of 14

November 10, 2015

operation. The soft-start function recharges CSS, and PWM

operation resumes with the error amplifier clamped to the SS

voltage. Should an overload occur while recharging CSS, the

soft-start function inhibits PWM operation while fully charging

CSS to 4V to complete its cycle. Figure 4 shows this operation

with an overload condition. Note that the inductor current

increases to over 15A during the CSS charging interval and

causes an overcurrent trip. The converter dissipates very little

power with this method. The measured input power for the

conditions of Figure 4 is 2.5W.

The overcurrent function will trip at a peak inductor current

(IPEAK) determined by:

where IOCSET is the internal OCSET current source (200A

typical). The OC trip point varies mainly due to the MOSFET’s

rDS(ON) variations. To avoid overcurrent tripping in the normal

operating load range, find 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

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”.

A small, ceramic capacitor should be placed in parallel with

ROCSET to smooth the voltage across ROCSET in the

presence of switching noise on the input voltage.

Output Voltage Program

The output voltage of a HIP6004E converter is programmed to

discreet levels between 1.05VDC and 1.825VDC. The voltage

identification (VID) pins program an internal voltage reference

(DACOUT) with a TTL-compatible 5-bit digital-to-analog

converter (DAC). The level of DACOUT also sets the PGOOD

and OVP thresholds. Table 1 specifies the DACOUT voltage for

the 32 different combinations of connections on the VID pins.

The output voltage should not be adjusted while the converter is

delivering power. Remove input power before changing the

output voltage. Adjusting the output voltage during operation

could toggle the PGOOD signal and exercise the overvoltage

protection.

Application Guidelines

Layout Considerations

As in any high frequency switching converter, layout is very

important. Switching current from one power device to another

can generate voltage transients across the impedances of the

interconnecting bond wires and circuit traces. These

interconnecting impedances should be minimized by using wide,

short-printed circuit traces. The critical components should be

located as close together as possible, using ground plane

construction or single point grounding.

IPEAK

IOCSET x ROCSET

rDS ON



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

IPEAK IOUT MAX



I

 2





TABLE 1. OUTPUT VOLTAGE PROGRAM

PIN NAME

NOMINAL OUTPUT

VOLTAGE DACOUT

PIN NAME

NOMINAL OUTPUT

VOLTAGE DACOUT

VID25

VID3

VID2

VID1

VID0

VID25

VID3

VID2

VID1

VID0

100

1.050

110

1.450

100

1.075

110

1.475

011

1.100

101

1.500

011

1.125

101

1.525

010

1.150

101

1.550

010

1.175

101

1.575

001

1.200

100

1.600

001

1.225

100

1.625

000

1.250

100

1.650

000

1.275

100

1.675

111

1.300

011

1.700

111

1.325

011

1.725

110

1.350

011

1.750

110

1.375

011

1.775

101

1.400

010

1.800

101

1.425

010

1.825

NOTE: 0 = connected to GND or VSS, 1 = connected to VDD through pull-up resistors or leave the pins floating. Internal pull-ups will force the floating

VID pins to HIGH.

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