HIP6003CB datasheet(6/12 Pages) INTERSIL

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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:

where IOCSET is the internal OCSET current source (200µA

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

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 HIP6003 converter is programmed to

discrete levels between 2.0VDC and 3.5VDC. The voltage

identiﬁcation (VID) pins program an internal voltage

reference (DACOUT) with a 4-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 16 combinations of open or short 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.

The DAC function is a precision non-inverting summation

ampliﬁer shown in Figure 5. The resistor values shown are

only approximations of the actual precision values used.

Grounding any combination of the VID pins increases the

DACOUT voltage. The ‘open’ circuit voltage on the VID pins

is the band gap reference voltage, 1.26V.

TIME (20ms/DIV)

10A

15A

FIGURE 4. OVER-CURRENT OPERATION

PEAK =

OCSET

•

DS ON

()

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

TABLE 1. OUTPUT VOLTAGE PROGRAM

PIN NAME

NOMINAL

DACOUT

VOLTAGE

VID3

VID2

VID1

VID0

1111

2.0

1110

2.1

1101

2.2

1100

2.3

1011

2.4

1010

2.5

1001

2.6

1000

2.7

0111

2.8

0110

2.9

0101

3.0

0100

3.1

0011

3.2

0010

3.3

0001

3.4

0000

3.5

NOTE: 0 = Connected to GND or VSS, 1 = OPEN

BAND GAP

REFERENCE

1.26V

VID0

VID1

VID2

VID3

COMP

DACOUT

ERROR

AMPLIFIER

21.5k

Ω

1.7k

Ω

10.7k

Ω

5.4k

Ω

2.7k

Ω

2.9k

Ω

DAC

FIGURE 5. DAC FUNCTION SCHEMATIC

HIP6003

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