HIP6004DCB-T(2000) View Datasheet(PDF) - Intersil

Part Name

Description

Manufacturer

HIP6004DCB-T
(Rev.:2000)

Buck and Synchronous-Rectifier (PWM) Controller and Output Voltage Monitor

Intersil 

HIP6004D

referenced to VIN) exceeds the voltage across ROCSET, the

over-current function initiates a soft-start sequence. The soft-

start function discharges CSS with a 10µA current sink and

inhibits PWM 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 over-current trip. The

converter dissipates very little power with this method. The

measured input power for the conditions of Figure 4 is 2.5W.

The over-current function will trip at a peak inductor current

(IPEAK) determined by:

IPEAK = I--O-----C----S----E-r--D-T---S--x--(--O-R----N-O---)-C-----S----E---T--

where IOCSET is the internal OCSET current source (200µA

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

MOSFET’s rDS(ON) variations. To avoid over-current 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 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’.

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 HIP6004D converter is programmed

to discrete levels between 1.100VDC and 1.850VDC. 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.

‘11111’ VID pin combination resulting in a 0V output setting

activates the Power-On Reset function and disables the gate

drives circuitry. For this specific VID combination, though,

PGOOD asserts a high level. This unusual behavior has been

implemented in order to allow for operation in dual-

microprocessor systems where AND-ing of the PGOOD

signals from two individual power converters is implemented.

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.

TABLE 1. OUTPUT VOLTAGE PROGRAM

VID4

1

PIN NAME

VID3 VID2 VID1

1

1

1

VID0

1

NOMINAL OUTPUT

VOLTAGE DACOUT

0

VID4

0

PIN NAME

VID3 VID2 VID1

1

1

1

1

1

1

1

0

1.100

0

1

1

1

1

1

1

0

1

1.125

0

1

1

0

1

1

1

0

0

1.150

0

1

1

0

1

1

0

1

1

1.175

0

1

0

1

1

1

0

1

0

1.200

0

1

0

1

1

1

0

0

1

1.225

0

1

0

0

1

1

0

0

0

1

0

1

1

1

1

0

1

1

0

1.250

1.275

1.300

0

1

0

0

0

0

1

1

0

0

1

1

1

0

1

0

1

1.325

0

0

1

0

1

0

1

0

0

1.350

0

0

1

0

1

0

0

1

1

1.375

0

0

0

1

1

0

0

1

0

1.400

0

0

0

1

1

0

0

0

1

1.425

0

0

0

0

1

0

0

0

0

1.450

0

0

0

0

NOTE: 0 = connected to GND or VSS, 1 = connected to VDD through pull-up resistors.

VID0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

NOMINAL OUTPUT

VOLTAGE DACOUT

1.475

1.500

1.525

1.550

1.575

1.600

1.625

1.650

1.675

1.700

1.725

1.750

1.775

1.800

1.825

1.850

6

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